Upgrade to FDKv2

Bug: 71430241 Test: CTS DecoderTest and DecoderTestAacDrc original-Change-Id: Iaa20f749b8a04d553b20247cfe1a8930ebbabe30 Apply clang-format also on header files. original-Change-Id: I14de1ef16bbc79ec0283e745f98356a10efeb2e4 Fixes for MPEG-D DRC original-Change-Id: If1de2d74bbbac84b3f67de3b88b83f6a23b8a15c Catch unsupported tw_mdct at an early stage original-Change-Id: Ied9dd00d754162a0e3ca1ae3e6b854315d818afe Fixing PVC transition frames original-Change-Id: Ib75725abe39252806c32d71176308f2c03547a4e Move qmf bands sanity check original-Change-Id: Iab540c3013c174d9490d2ae100a4576f51d8dbc4 Initialize scaling variable original-Change-Id: I3c4087101b70e998c71c1689b122b0d7762e0f9e Add 16 qmf band configuration to getSlotNrgHQ() original-Change-Id: I49a5d30f703a1b126ff163df9656db2540df21f1 Always apply byte alignment at the end of the AudioMuxElement original-Change-Id: I42d560287506d65d4c3de8bfe3eb9a4ebeb4efc7 Setup SBR element only if no parse error exists original-Change-Id: I1915b73704bc80ab882b9173d6bec59cbd073676 Additional array index check in HCR original-Change-Id: I18cc6e501ea683b5009f1bbee26de8ddd04d8267 Fix fade-in index selection in concealment module original-Change-Id: Ibf802ed6ed8c05e9257e1f3b6d0ac1162e9b81c1 Enable explicit backward compatible parser for AAC_LD original-Change-Id: I27e9c678dcb5d40ed760a6d1e06609563d02482d Skip spatial specific config in explicit backward compatible ASC original-Change-Id: Iff7cc365561319e886090cedf30533f562ea4d6e Update flags description in decoder API original-Change-Id: I9a5b4f8da76bb652f5580cbd3ba9760425c43830 Add QMF domain reset function original-Change-Id: I4f89a8a2c0277d18103380134e4ed86996e9d8d6 DRC upgrade v2.1.0 original-Change-Id: I5731c0540139dab220094cd978ef42099fc45b74 Fix integer overflow in sqrtFixp_lookup() original-Change-Id: I429a6f0d19aa2cc957e0f181066f0ca73968c914 Fix integer overflow in invSqrtNorm2() original-Change-Id: I84de5cbf9fb3adeb611db203fe492fabf4eb6155 Fix integer overflow in GenerateRandomVector() original-Change-Id: I3118a641008bd9484d479e5b0b1ee2b5d7d44d74 Fix integer overflow in adjustTimeSlot_EldGrid() original-Change-Id: I29d503c247c5c8282349b79df940416a512fb9d5 Fix integer overflow in FDKsbrEnc_codeEnvelope() original-Change-Id: I6b34b61ebb9d525b0c651ed08de2befc1f801449 Follow-up on: Fix integer overflow in adjustTimeSlot_EldGrid() original-Change-Id: I6f8f578cc7089e5eb7c7b93e580b72ca35ad689a Fix integer overflow in get_pk_v2() original-Change-Id: I63375bed40d45867f6eeaa72b20b1f33e815938c Fix integer overflow in Syn_filt_zero() original-Change-Id: Ie0c02fdfbe03988f9d3b20d10cd9fe4c002d1279 Fix integer overflow in CFac_CalcFacSignal() original-Change-Id: Id2d767c40066c591b51768e978eb8af3b803f0c5 Fix integer overflow in FDKaacEnc_FDKaacEnc_calcPeNoAH() original-Change-Id: Idcbd0f4a51ae2550ed106aa6f3d678d1f9724841 Fix integer overflow in sbrDecoder_calculateGainVec() original-Change-Id: I7081bcbe29c5cede9821b38d93de07c7add2d507 Fix integer overflow in CLpc_SynthesisLattice() original-Change-Id: I4a95ddc18de150102352d4a1845f06094764c881 Fix integer overflow in Pred_Lt4() original-Change-Id: I4dbd012b2de7d07c3e70a47b92e3bfae8dbc750a Fix integer overflow in FDKsbrEnc_InitSbrFastTransientDetector() original-Change-Id: I788cbec1a4a00f44c2f3a72ad7a4afa219807d04 Fix unsigned integer overflow in FDKaacEnc_WriteBitstream() original-Change-Id: I68fc75166e7d2cd5cd45b18dbe3d8c2a92f1822a Fix unsigned integer overflow in FDK_MetadataEnc_Init() original-Change-Id: Ie8d025f9bcdb2442c704bd196e61065c03c10af4 Fix overflow in pseudo random number generators original-Change-Id: I3e2551ee01356297ca14e3788436ede80bd5513c Fix unsigned integer overflow in sbrDecoder_Parse() original-Change-Id: I3f231b2f437e9c37db4d5b964164686710eee971 Fix unsigned integer overflow in longsub() original-Change-Id: I73c2bc50415cac26f1f5a29e125bbe75f9180a6e Fix unsigned integer overflow in CAacDecoder_DecodeFrame() original-Change-Id: Ifce2db4b1454b46fa5f887e9d383f1cc43b291e4 Fix overflow at CLpdChannelStream_Read() original-Change-Id: Idb9d822ce3a4272e4794b643644f5434e2d4bf3f Fix unsigned integer overflow in Hcr_State_BODY_SIGN_ESC__ESC_WORD() original-Change-Id: I1ccf77c0015684b85534c5eb97162740a870b71c Fix unsigned integer overflow in UsacConfig_Parse() original-Change-Id: Ie6d27f84b6ae7eef092ecbff4447941c77864d9f Fix unsigned integer overflow in aacDecoder_drcParse() original-Change-Id: I713f28e883eea3d70b6fa56a7b8f8c22bcf66ca0 Fix unsigned integer overflow in aacDecoder_drcReadCompression() original-Change-Id: Ia34dfeb88c4705c558bce34314f584965cafcf7a Fix unsigned integer overflow in CDataStreamElement_Read() original-Change-Id: Iae896cc1d11f0a893d21be6aa90bd3e60a2c25f0 Fix unsigned integer overflow in transportDec_AdjustEndOfAccessUnit() original-Change-Id: I64cf29a153ee784bb4a16fdc088baabebc0007dc Fix unsigned integer overflow in transportDec_GetAuBitsRemaining() original-Change-Id: I975b3420faa9c16a041874ba0db82e92035962e4 Fix unsigned integer overflow in extractExtendedData() original-Change-Id: I2a59eb09e2053cfb58dfb75fcecfad6b85a80a8f Fix signed integer overflow in CAacDecoder_ExtPayloadParse() original-Change-Id: I4ad5ca4e3b83b5d964f1c2f8c5e7b17c477c7929 Fix unsigned integer overflow in CAacDecoder_DecodeFrame() original-Change-Id: I29a39df77d45c52a0c9c5c83c1ba81f8d0f25090 Follow-up on: Fix integer overflow in CLpc_SynthesisLattice() original-Change-Id: I8fb194ffc073a3432a380845be71036a272d388f Fix signed integer overflow in _interpolateDrcGain() original-Change-Id: I879ec9ab14005069a7c47faf80e8bc6e03d22e60 Fix unsigned integer overflow in FDKreadBits() original-Change-Id: I1f47a6a8037ff70375aa8844947d5681bb4287ad Fix unsigned integer overflow in FDKbyteAlign() original-Change-Id: Id5f3a11a0c9e50fc6f76ed6c572dbd4e9f2af766 Fix unsigned integer overflow in FDK_get32() original-Change-Id: I9d33b8e97e3d38cbb80629cb859266ca0acdce96 Fix unsigned integer overflow in FDK_pushBack() original-Change-Id: Ic87f899bc8c6acf7a377a8ca7f3ba74c3a1e1c19 Fix unsigned integer overflow in FDK_pushForward() original-Change-Id: I3b754382f6776a34be1602e66694ede8e0b8effc Fix unsigned integer overflow in ReadPsData() original-Change-Id: I25361664ba8139e32bbbef2ca8c106a606ce9c37 Fix signed integer overflow in E_UTIL_residu() original-Change-Id: I8c3abd1f437ee869caa8fb5903ce7d3d641b6aad REVERT: Follow-up on: Integer overflow in CLpc_SynthesisLattice(). original-Change-Id: I3d340099acb0414795c8dfbe6362bc0a8f045f9b Follow-up on: Fix integer overflow in CLpc_SynthesisLattice() original-Change-Id: I4aedb8b3a187064e9f4d985175aa55bb99cc7590 Follow-up on: Fix unsigned integer overflow in aacDecoder_drcParse() original-Change-Id: I2aa2e13916213bf52a67e8b0518e7bf7e57fb37d Fix integer overflow in acelp original-Change-Id: Ie6390c136d84055f8b728aefbe4ebef6e029dc77 Fix unsigned integer overflow in aacDecoder_UpdateBitStreamCounters() original-Change-Id: I391ffd97ddb0b2c184cba76139bfb356a3b4d2e2 Adjust concealment default settings original-Change-Id: I6a95db935a327c47df348030bcceafcb29f54b21 Saturate estimatedStartPos original-Change-Id: I27be2085e0ae83ec9501409f65e003f6bcba1ab6 Negative shift exponent in _interpolateDrcGain() original-Change-Id: I18edb26b26d002aafd5e633d4914960f7a359c29 Negative shift exponent in calculateICC() original-Change-Id: I3dcd2ae98d2eb70ee0d59750863cbb2a6f4f8aba Too large shift exponent in FDK_put() original-Change-Id: Ib7d9aaa434d2d8de4a13b720ca0464b31ca9b671 Too large shift exponent in CalcInvLdData() original-Change-Id: I43e6e78d4cd12daeb1dcd5d82d1798bdc2550262 Member access within null pointer of type SBR_CHANNEL original-Change-Id: Idc5e4ea8997810376d2f36bbdf628923b135b097 Member access within null pointer of type CpePersistentData original-Change-Id: Ib6c91cb0d37882768e5baf63324e429589de0d9d Member access within null pointer FDKaacEnc_psyMain() original-Change-Id: I7729b7f4479970531d9dc823abff63ca52e01997 Member access within null pointer FDKaacEnc_GetPnsParam() original-Change-Id: I9aa3b9f3456ae2e0f7483dbd5b3dde95fc62da39 Member access within null pointer FDKsbrEnc_EnvEncodeFrame() original-Change-Id: I67936f90ea714e90b3e81bc0dd1472cc713eb23a Add HCR sanity check original-Change-Id: I6c1d9732ebcf6af12f50b7641400752f74be39f7 Fix memory issue for HBE edge case with 8:3 SBR original-Change-Id: I11ea58a61e69fbe8bf75034b640baee3011e63e9 Additional SBR parametrization sanity check for ELD original-Change-Id: Ie26026fbfe174c2c7b3691f6218b5ce63e322140 Add MPEG-D DRC channel layout check original-Change-Id: Iea70a74f171b227cce636a9eac4ba662777a2f72 Additional out-of-bounds checks in MPEG-D DRC original-Change-Id: Ife4a8c3452c6fde8a0a09e941154a39a769777d4 Change-Id: Ic63cb2f628720f54fe9b572b0cb528e2599c624e
author: Fraunhofer IIS FDK <audio-fdk@iis.fraunhofer.de> 2018-02-26 20:17:00 +0100
committer: Jean-Michel Trivi <jmtrivi@google.com> 2018-04-19 11:21:15 -0700
commit: 6cfabd35363c3ef5e3b209b867169a500b3ccc3c (patch)
tree: 01c0a19f2735e8b5d2407555fe992d4230d089eb /libDRCdec
parent: 6288a1e34c4dede4c2806beb1736ece6580558c7 (diff)
download: aac-6cfabd35363c3ef5e3b209b867169a500b3ccc3c.tar.gz
20 files changed, 10840 insertions, 0 deletions
diff --git a/libDRCdec/include/FDK_drcDecLib.h b/libDRCdec/include/FDK_drcDecLib.h
new file mode 100644
index 0000000..e187e18
--- /dev/null
+++ b/libDRCdec/include/FDK_drcDecLib.h
@@ -0,0 +1,313 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):   Bernhard Neugebauer
+
+   Description: MPEG-D DRC Decoder
+
+*******************************************************************************/
+
+#ifndef FDK_DRCDECLIB_H
+#define FDK_DRCDECLIB_H
+
+#include "FDK_bitstream.h"
+#include "FDK_audio.h"
+#include "common_fix.h"
+
+/* DRC decoder according to ISO/IEC 23003-4 (MPEG-D DRC) */
+/* including ISO/IEC 23003-4/AMD1 (Amendment 1) */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct s_drc_decoder* HANDLE_DRC_DECODER;
+typedef struct s_uni_drc_interface* HANDLE_UNI_DRC_INTERFACE;
+typedef struct s_selection_process_output* HANDLE_SEL_PROC_OUTPUT;
+
+typedef enum {
+  DRC_DEC_SELECTION = 0x1, /* DRC decoder instance for DRC set selection only */
+  DRC_DEC_GAIN = 0x2,      /* DRC decoder instance for applying DRC only */
+  DRC_DEC_ALL = 0x3        /* DRC decoder with full functionality */
+} DRC_DEC_FUNCTIONAL_RANGE;
+
+typedef enum {
+  /* get and set userparams */
+  DRC_DEC_BOOST,
+  DRC_DEC_COMPRESS,
+  /* set only userparams */
+  DRC_DEC_LOUDNESS_NORMALIZATION_ON,
+  DRC_DEC_TARGET_LOUDNESS, /**< target loudness in dB, with exponent e = 7 */
+  DRC_DEC_EFFECT_TYPE,
+  DRC_DEC_EFFECT_TYPE_FALLBACK_CODE,
+  DRC_DEC_LOUDNESS_MEASUREMENT_METHOD,
+  /* set only system (not user) parameters */
+  DRC_DEC_DOWNMIX_ID,
+  DRC_DEC_TARGET_CHANNEL_COUNT_REQUESTED, /**< number of output channels
+                                             notified to FDK_drcDecLib for
+                                             choosing an appropriate
+                                             downmixInstruction */
+  DRC_DEC_BASE_CHANNEL_COUNT,
+  /* get only system parameters */
+  DRC_DEC_IS_MULTIBAND_DRC_1,
+  DRC_DEC_IS_MULTIBAND_DRC_2,
+  DRC_DEC_IS_ACTIVE, /**< MPEG-D DRC payload is present and at least one of
+                        Dynamic Range Control (DRC) or Loudness Normalization
+                        (LN) is activated */
+  DRC_DEC_TARGET_CHANNEL_COUNT_SELECTED /**< number of output channels if
+                                           appropriate downmixInstruction exists
+                                         */
+} DRC_DEC_USERPARAM;
+
+typedef enum {
+  DRC_DEC_OK = 0,
+
+  DRC_DEC_NOT_OK = -10000,
+  DRC_DEC_OUT_OF_MEMORY,
+  DRC_DEC_NOT_OPENED,
+  DRC_DEC_NOT_READY,
+  DRC_DEC_PARAM_OUT_OF_RANGE,
+  DRC_DEC_INVALID_PARAM,
+  DRC_DEC_UNSUPPORTED_FUNCTION
+} DRC_DEC_ERROR;
+
+typedef enum {
+  DRC_DEC_TEST_TIME_DOMAIN = -100,
+  DRC_DEC_TEST_QMF_DOMAIN,
+  DRC_DEC_TEST_STFT_DOMAIN,
+  DRC_DEC_CODEC_MODE_UNDEFINED = -1,
+  DRC_DEC_MPEG_4_AAC,
+  DRC_DEC_MPEG_D_USAC,
+  DRC_DEC_MPEG_H_3DA
+} DRC_DEC_CODEC_MODE;
+
+/* Apply only DRC sets dedicated to processing location.
+   DRC1: before downmix
+   DRC2: before or after downmix (AMD1: only after downmix)
+   DRC3: after downmix */
+typedef enum {
+  DRC_DEC_DRC1,
+  DRC_DEC_DRC1_DRC2,
+  DRC_DEC_DRC2,
+  DRC_DEC_DRC3,
+  DRC_DEC_DRC2_DRC3
+} DRC_DEC_LOCATION;
+
+DRC_DEC_ERROR
+FDK_drcDec_Open(HANDLE_DRC_DECODER* phDrcDec,
+                const DRC_DEC_FUNCTIONAL_RANGE functionalRange);
+
+DRC_DEC_ERROR
+FDK_drcDec_SetCodecMode(HANDLE_DRC_DECODER hDrcDec,
+                        const DRC_DEC_CODEC_MODE codecMode);
+
+DRC_DEC_ERROR
+FDK_drcDec_Init(HANDLE_DRC_DECODER hDrcDec, const int frameSize,
+                const int sampleRate, const int baseChannelCount);
+
+DRC_DEC_ERROR
+FDK_drcDec_Close(HANDLE_DRC_DECODER* phDrcDec);
+
+/* set single user request */
+DRC_DEC_ERROR
+FDK_drcDec_SetParam(HANDLE_DRC_DECODER hDrcDec,
+                    const DRC_DEC_USERPARAM requestType,
+                    const FIXP_DBL requestValue);
+
+LONG FDK_drcDec_GetParam(HANDLE_DRC_DECODER hDrcDec,
+                         const DRC_DEC_USERPARAM requestType);
+
+DRC_DEC_ERROR
+FDK_drcDec_SetInterfaceParameters(HANDLE_DRC_DECODER hDrcDec,
+                                  HANDLE_UNI_DRC_INTERFACE uniDrcInterface);
+
+DRC_DEC_ERROR
+FDK_drcDec_SetSelectionProcessMpeghParameters_simple(
+    HANDLE_DRC_DECODER hDrcDec, const int groupPresetIdRequested,
+    const int numGroupIdsRequested, const int* groupIdsRequested);
+
+DRC_DEC_ERROR
+FDK_drcDec_SetDownmixInstructions(HANDLE_DRC_DECODER hDrcDec,
+                                  const int numDowmixId, const int* downmixId,
+                                  const int* targetLayout,
+                                  const int* targetChannelCount);
+
+void FDK_drcDec_SetSelectionProcessOutput(
+    HANDLE_DRC_DECODER hDrcDec, HANDLE_SEL_PROC_OUTPUT hSelProcOutput);
+
+HANDLE_SEL_PROC_OUTPUT
+FDK_drcDec_GetSelectionProcessOutput(HANDLE_DRC_DECODER hDrcDec);
+
+LONG /* FIXP_DBL, e = 7 */
+FDK_drcDec_GetGroupLoudness(HANDLE_SEL_PROC_OUTPUT hSelProcOutput,
+                            const int groupID, int* groupLoudnessAvailable);
+
+void FDK_drcDec_SetChannelGains(HANDLE_DRC_DECODER hDrcDec,
+                                const int numChannels, const int frameSize,
+                                FIXP_DBL* channelGainDb, FIXP_DBL* audioBuffer,
+                                const int audioBufferChannelOffset);
+
+DRC_DEC_ERROR
+FDK_drcDec_ReadUniDrcConfig(HANDLE_DRC_DECODER hDrcDec,
+                            HANDLE_FDK_BITSTREAM hBitstream);
+
+DRC_DEC_ERROR
+FDK_drcDec_ReadLoudnessInfoSet(HANDLE_DRC_DECODER hDrcDec,
+                               HANDLE_FDK_BITSTREAM hBitstream);
+
+DRC_DEC_ERROR
+FDK_drcDec_ReadLoudnessBox(HANDLE_DRC_DECODER hDrcDec,
+                           HANDLE_FDK_BITSTREAM hBitstream);
+
+DRC_DEC_ERROR
+FDK_drcDec_ReadDownmixInstructions_Box(HANDLE_DRC_DECODER hDrcDec,
+                                       HANDLE_FDK_BITSTREAM hBitstream);
+
+DRC_DEC_ERROR
+FDK_drcDec_ReadUniDrcInstructions_Box(HANDLE_DRC_DECODER hDrcDec,
+                                      HANDLE_FDK_BITSTREAM hBitstream);
+
+DRC_DEC_ERROR
+FDK_drcDec_ReadUniDrcCoefficients_Box(HANDLE_DRC_DECODER hDrcDec,
+                                      HANDLE_FDK_BITSTREAM hBitstream);
+
+DRC_DEC_ERROR
+FDK_drcDec_ReadUniDrcGain(HANDLE_DRC_DECODER hDrcDec,
+                          HANDLE_FDK_BITSTREAM hBitstream);
+
+/* either call FDK_drcDec_ReadUniDrcConfig, FDK_drcDec_ReadLoudnessInfoSet and
+   FDK_drcDec_ReadUniDrcGain separately, or call FDK_drcDec_ReadUniDrc */
+DRC_DEC_ERROR
+FDK_drcDec_ReadUniDrc(HANDLE_DRC_DECODER hDrcDec,
+                      HANDLE_FDK_BITSTREAM hBitstream);
+
+/* calling sequence:
+   FDK_drcDec_Read...()
+   FDK_drcDec_SetChannelGains()
+   FDK_drcDec_Preprocess()
+   FDK_drcDec_Process...() */
+
+DRC_DEC_ERROR
+FDK_drcDec_Preprocess(HANDLE_DRC_DECODER hDrcDec);
+
+DRC_DEC_ERROR
+FDK_drcDec_ProcessTime(HANDLE_DRC_DECODER hDrcDec, const int delaySamples,
+                       const DRC_DEC_LOCATION drcLocation,
+                       const int channelOffset, const int drcChannelOffset,
+                       const int numChannelsProcessed, FIXP_DBL* realBuffer,
+                       const int timeDataChannelOffset);
+
+DRC_DEC_ERROR
+FDK_drcDec_ProcessFreq(HANDLE_DRC_DECODER hDrcDec, const int delaySamples,
+                       const DRC_DEC_LOCATION drcLocation,
+                       const int channelOffset, const int drcChannelOffset,
+                       const int numChannelsProcessed,
+                       const int processSingleTimeslot, FIXP_DBL** realBuffer,
+                       FIXP_DBL** imagBuffer);
+
+DRC_DEC_ERROR
+FDK_drcDec_ApplyDownmix(HANDLE_DRC_DECODER hDrcDec, int* reverseInChannelMap,
+                        int* reverseOutChannelMap, FIXP_DBL* realBuffer,
+                        int* pNChannels);
+
+/* Get library info for this module. */
+DRC_DEC_ERROR
+FDK_drcDec_GetLibInfo(LIB_INFO* info);
+
+#ifdef __cplusplus
+}
+#endif
+#endif
diff --git a/libDRCdec/src/FDK_drcDecLib.cpp b/libDRCdec/src/FDK_drcDecLib.cpp
new file mode 100644
index 0000000..b29b79d
--- /dev/null
+++ b/libDRCdec/src/FDK_drcDecLib.cpp
@@ -0,0 +1,891 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):   Bernhard Neugebauer
+
+   Description: MPEG-D DRC Decoder
+
+*******************************************************************************/
+
+#include "drcDec_reader.h"
+#include "drcDec_gainDecoder.h"
+#include "FDK_drcDecLib.h"
+
+#include "drcDec_selectionProcess.h"
+#include "drcDec_tools.h"
+
+/* Decoder library info */
+#define DRCDEC_LIB_VL0 2
+#define DRCDEC_LIB_VL1 1
+#define DRCDEC_LIB_VL2 0
+#define DRCDEC_LIB_TITLE "MPEG-D DRC Decoder Lib"
+#ifdef __ANDROID__
+#define DRCDEC_LIB_BUILD_DATE ""
+#define DRCDEC_LIB_BUILD_TIME ""
+#else
+#define DRCDEC_LIB_BUILD_DATE __DATE__
+#define DRCDEC_LIB_BUILD_TIME __TIME__
+#endif
+
+typedef enum {
+  DRC_DEC_NOT_INITIALIZED = 0,
+  DRC_DEC_INITIALIZED,
+  DRC_DEC_NEW_GAIN_PAYLOAD,
+  DRC_DEC_INTERPOLATION_PREPARED
+} DRC_DEC_STATUS;
+
+struct s_drc_decoder {
+  DRC_DEC_CODEC_MODE codecMode;
+  DRC_DEC_FUNCTIONAL_RANGE functionalRange;
+  DRC_DEC_STATUS status;
+
+  /* handles of submodules */
+  HANDLE_DRC_GAIN_DECODER hGainDec;
+  HANDLE_DRC_SELECTION_PROCESS hSelectionProc;
+  int selProcInputDiff;
+
+  /* data structs */
+  UNI_DRC_CONFIG uniDrcConfig;
+  LOUDNESS_INFO_SET loudnessInfoSet;
+  UNI_DRC_GAIN uniDrcGain;
+
+  SEL_PROC_OUTPUT selProcOutput;
+} DRC_DECODER;
+
+static int isResetNeeded(HANDLE_DRC_DECODER hDrcDec,
+                         const SEL_PROC_OUTPUT oldSelProcOutput) {
+  int i, resetNeeded = 0;
+
+  if (hDrcDec->selProcOutput.numSelectedDrcSets !=
+      oldSelProcOutput.numSelectedDrcSets) {
+    resetNeeded = 1;
+  } else {
+    for (i = 0; i < hDrcDec->selProcOutput.numSelectedDrcSets; i++) {
+      if (hDrcDec->selProcOutput.selectedDrcSetIds[i] !=
+          oldSelProcOutput.selectedDrcSetIds[i])
+        resetNeeded = 1;
+      if (hDrcDec->selProcOutput.selectedDownmixIds[i] !=
+          oldSelProcOutput.selectedDownmixIds[i])
+        resetNeeded = 1;
+    }
+  }
+
+  if (hDrcDec->selProcOutput.boost != oldSelProcOutput.boost) resetNeeded = 1;
+  if (hDrcDec->selProcOutput.compress != oldSelProcOutput.compress)
+    resetNeeded = 1;
+
+  /* Note: Changes in downmix matrix are not caught, as they don't affect the
+   * DRC gain decoder */
+
+  return resetNeeded;
+}
+
+static DRC_DEC_ERROR startSelectionProcess(HANDLE_DRC_DECODER hDrcDec) {
+  DRC_ERROR dErr = DE_OK;
+  DRCDEC_SELECTION_PROCESS_RETURN sErr = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+  int uniDrcConfigHasChanged = 0;
+  SEL_PROC_OUTPUT oldSelProcOutput = hDrcDec->selProcOutput;
+
+  if (!hDrcDec->status) return DRC_DEC_NOT_READY;
+
+  if (hDrcDec->functionalRange & DRC_DEC_SELECTION) {
+    uniDrcConfigHasChanged = hDrcDec->uniDrcConfig.diff;
+    if (hDrcDec->uniDrcConfig.diff || hDrcDec->loudnessInfoSet.diff ||
+        hDrcDec->selProcInputDiff) {
+      /* in case of an error, signal that selection process was not successful
+       */
+      hDrcDec->selProcOutput.numSelectedDrcSets = 0;
+
+      sErr = drcDec_SelectionProcess_Process(
+          hDrcDec->hSelectionProc, &(hDrcDec->uniDrcConfig),
+          &(hDrcDec->loudnessInfoSet), &(hDrcDec->selProcOutput));
+      if (sErr) return DRC_DEC_OK;
+
+      hDrcDec->selProcInputDiff = 0;
+      hDrcDec->uniDrcConfig.diff = 0;
+      hDrcDec->loudnessInfoSet.diff = 0;
+    }
+  }
+
+  if (hDrcDec->functionalRange & DRC_DEC_GAIN) {
+    if (isResetNeeded(hDrcDec, oldSelProcOutput) || uniDrcConfigHasChanged) {
+      dErr =
+          drcDec_GainDecoder_Config(hDrcDec->hGainDec, &(hDrcDec->uniDrcConfig),
+                                    hDrcDec->selProcOutput.numSelectedDrcSets,
+                                    hDrcDec->selProcOutput.selectedDrcSetIds,
+                                    hDrcDec->selProcOutput.selectedDownmixIds);
+      if (dErr) return DRC_DEC_OK;
+    }
+  }
+  return DRC_DEC_OK;
+}
+
+DRC_DEC_ERROR
+FDK_drcDec_Open(HANDLE_DRC_DECODER* phDrcDec,
+                const DRC_DEC_FUNCTIONAL_RANGE functionalRange) {
+  DRC_ERROR dErr = DE_OK;
+  DRCDEC_SELECTION_PROCESS_RETURN sErr = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+  HANDLE_DRC_DECODER hDrcDec;
+
+  *phDrcDec = (HANDLE_DRC_DECODER)FDKcalloc(1, sizeof(DRC_DECODER));
+  if (!*phDrcDec) return DRC_DEC_OUT_OF_MEMORY;
+  hDrcDec = *phDrcDec;
+
+  hDrcDec->functionalRange = functionalRange;
+
+  hDrcDec->status = DRC_DEC_NOT_INITIALIZED;
+  hDrcDec->codecMode = DRC_DEC_CODEC_MODE_UNDEFINED;
+
+  if (hDrcDec->functionalRange & DRC_DEC_SELECTION) {
+    sErr = drcDec_SelectionProcess_Create(&(hDrcDec->hSelectionProc));
+    if (sErr) return DRC_DEC_OUT_OF_MEMORY;
+    sErr = drcDec_SelectionProcess_Init(hDrcDec->hSelectionProc);
+    if (sErr) return DRC_DEC_NOT_OK;
+    hDrcDec->selProcInputDiff = 1;
+  }
+
+  if (hDrcDec->functionalRange & DRC_DEC_GAIN) {
+    dErr = drcDec_GainDecoder_Open(&(hDrcDec->hGainDec));
+    if (dErr) return DRC_DEC_OUT_OF_MEMORY;
+  }
+
+  return DRC_DEC_OK;
+}
+
+DRC_DEC_ERROR
+FDK_drcDec_SetCodecMode(HANDLE_DRC_DECODER hDrcDec,
+                        const DRC_DEC_CODEC_MODE codecMode) {
+  DRC_ERROR dErr = DE_OK;
+  DRCDEC_SELECTION_PROCESS_RETURN sErr = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+
+  if (hDrcDec == NULL) return DRC_DEC_NOT_OPENED;
+
+  if (hDrcDec->codecMode ==
+      DRC_DEC_CODEC_MODE_UNDEFINED) { /* Set codec mode, if it is set for the
+                                         first time */
+    hDrcDec->codecMode = codecMode;
+
+    if (hDrcDec->functionalRange & DRC_DEC_SELECTION) {
+      sErr = drcDec_SelectionProcess_SetCodecMode(
+          hDrcDec->hSelectionProc, (SEL_PROC_CODEC_MODE)codecMode);
+      if (sErr) return DRC_DEC_NOT_OK;
+      hDrcDec->selProcInputDiff = 1;
+    }
+
+    if (hDrcDec->functionalRange & DRC_DEC_GAIN) {
+      DELAY_MODE delayMode;
+      int timeDomainSupported;
+      SUBBAND_DOMAIN_MODE subbandDomainSupported;
+
+      switch (hDrcDec->codecMode) {
+        case DRC_DEC_MPEG_4_AAC:
+        case DRC_DEC_MPEG_D_USAC:
+        case DRC_DEC_MPEG_H_3DA:
+        default:
+          delayMode = DM_REGULAR_DELAY;
+      }
+
+      switch (hDrcDec->codecMode) {
+        case DRC_DEC_MPEG_4_AAC:
+        case DRC_DEC_MPEG_D_USAC:
+          timeDomainSupported = 1;
+          subbandDomainSupported = SDM_OFF;
+          break;
+        case DRC_DEC_MPEG_H_3DA:
+          timeDomainSupported = 1;
+          subbandDomainSupported = SDM_STFT256;
+          break;
+
+        case DRC_DEC_TEST_TIME_DOMAIN:
+          timeDomainSupported = 1;
+          subbandDomainSupported = SDM_OFF;
+          break;
+        case DRC_DEC_TEST_QMF_DOMAIN:
+          timeDomainSupported = 0;
+          subbandDomainSupported = SDM_QMF64;
+          break;
+        case DRC_DEC_TEST_STFT_DOMAIN:
+          timeDomainSupported = 0;
+          subbandDomainSupported = SDM_STFT256;
+          break;
+
+        default:
+          timeDomainSupported = 0;
+          subbandDomainSupported = SDM_OFF;
+      }
+
+      dErr = drcDec_GainDecoder_SetCodecDependentParameters(
+          hDrcDec->hGainDec, delayMode, timeDomainSupported,
+          subbandDomainSupported);
+      if (dErr) return DRC_DEC_NOT_OK;
+    }
+  }
+
+  /* Don't allow changing codecMode if it has already been set. */
+  if (hDrcDec->codecMode != codecMode) return DRC_DEC_NOT_OK;
+
+  return DRC_DEC_OK;
+}
+
+DRC_DEC_ERROR
+FDK_drcDec_Init(HANDLE_DRC_DECODER hDrcDec, const int frameSize,
+                const int sampleRate, const int baseChannelCount) {
+  DRC_ERROR dErr = DE_OK;
+  DRCDEC_SELECTION_PROCESS_RETURN sErr = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+
+  if (hDrcDec == NULL || frameSize == 0 || sampleRate == 0 ||
+      baseChannelCount == 0)
+    return DRC_DEC_OK; /* return without doing anything */
+
+  if (hDrcDec->functionalRange & DRC_DEC_SELECTION) {
+    sErr = drcDec_SelectionProcess_SetParam(
+        hDrcDec->hSelectionProc, SEL_PROC_BASE_CHANNEL_COUNT,
+        (FIXP_DBL)baseChannelCount, &(hDrcDec->selProcInputDiff));
+    if (sErr) return DRC_DEC_NOT_OK;
+    sErr = drcDec_SelectionProcess_SetParam(
+        hDrcDec->hSelectionProc, SEL_PROC_SAMPLE_RATE, (FIXP_DBL)sampleRate,
+        &(hDrcDec->selProcInputDiff));
+    if (sErr) return DRC_DEC_NOT_OK;
+  }
+
+  if (hDrcDec->functionalRange & DRC_DEC_GAIN) {
+    dErr = drcDec_GainDecoder_Init(hDrcDec->hGainDec, frameSize, sampleRate);
+    if (dErr) return DRC_DEC_NOT_OK;
+  }
+
+  hDrcDec->status = DRC_DEC_INITIALIZED;
+
+  startSelectionProcess(hDrcDec);
+
+  return DRC_DEC_OK;
+}
+
+DRC_DEC_ERROR
+FDK_drcDec_Close(HANDLE_DRC_DECODER* phDrcDec) {
+  HANDLE_DRC_DECODER hDrcDec;
+
+  if (phDrcDec == NULL) {
+    return DRC_DEC_OK;
+  }
+
+  hDrcDec = *phDrcDec;
+
+  if (hDrcDec == NULL) return DRC_DEC_NOT_OPENED;
+
+  if (hDrcDec->functionalRange & DRC_DEC_GAIN) {
+    drcDec_GainDecoder_Close(&(hDrcDec->hGainDec));
+  }
+
+  if (hDrcDec->functionalRange & DRC_DEC_SELECTION) {
+    drcDec_SelectionProcess_Delete(&(hDrcDec->hSelectionProc));
+  }
+
+  FDKfree(*phDrcDec);
+  *phDrcDec = NULL;
+
+  return DRC_DEC_OK;
+}
+
+DRC_DEC_ERROR
+FDK_drcDec_SetParam(HANDLE_DRC_DECODER hDrcDec,
+                    const DRC_DEC_USERPARAM requestType,
+                    const FIXP_DBL requestValue) {
+  DRCDEC_SELECTION_PROCESS_RETURN sErr = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+
+  if (hDrcDec == NULL) return DRC_DEC_NOT_OPENED;
+
+  if (hDrcDec->functionalRange == DRC_DEC_GAIN)
+    return DRC_DEC_NOT_OK; /* not supported for DRC_DEC_GAIN. All parameters are
+                              handed over to selection process lib. */
+
+  switch (requestType) {
+    case DRC_DEC_BOOST:
+      sErr = drcDec_SelectionProcess_SetParam(hDrcDec->hSelectionProc,
+                                              SEL_PROC_BOOST, requestValue,
+                                              &(hDrcDec->selProcInputDiff));
+      if (sErr) return DRC_DEC_PARAM_OUT_OF_RANGE;
+      break;
+    case DRC_DEC_COMPRESS:
+      sErr = drcDec_SelectionProcess_SetParam(hDrcDec->hSelectionProc,
+                                              SEL_PROC_COMPRESS, requestValue,
+                                              &(hDrcDec->selProcInputDiff));
+      if (sErr) return DRC_DEC_PARAM_OUT_OF_RANGE;
+      break;
+    case DRC_DEC_LOUDNESS_NORMALIZATION_ON:
+      sErr = drcDec_SelectionProcess_SetParam(
+          hDrcDec->hSelectionProc, SEL_PROC_LOUDNESS_NORMALIZATION_ON,
+          requestValue, &(hDrcDec->selProcInputDiff));
+      if (sErr) return DRC_DEC_PARAM_OUT_OF_RANGE;
+      break;
+    case DRC_DEC_TARGET_LOUDNESS:
+      sErr = drcDec_SelectionProcess_SetParam(
+          hDrcDec->hSelectionProc, SEL_PROC_TARGET_LOUDNESS, requestValue,
+          &(hDrcDec->selProcInputDiff));
+      if (sErr) return DRC_DEC_PARAM_OUT_OF_RANGE;
+      break;
+    case DRC_DEC_EFFECT_TYPE:
+      sErr = drcDec_SelectionProcess_SetParam(
+          hDrcDec->hSelectionProc, SEL_PROC_EFFECT_TYPE, requestValue,
+          &(hDrcDec->selProcInputDiff));
+      if (sErr) return DRC_DEC_PARAM_OUT_OF_RANGE;
+      break;
+    case DRC_DEC_DOWNMIX_ID:
+      sErr = drcDec_SelectionProcess_SetParam(hDrcDec->hSelectionProc,
+                                              SEL_PROC_DOWNMIX_ID, requestValue,
+                                              &(hDrcDec->selProcInputDiff));
+      if (sErr) return DRC_DEC_PARAM_OUT_OF_RANGE;
+      break;
+    case DRC_DEC_TARGET_CHANNEL_COUNT_REQUESTED:
+      sErr = drcDec_SelectionProcess_SetParam(
+          hDrcDec->hSelectionProc, SEL_PROC_TARGET_CHANNEL_COUNT, requestValue,
+          &(hDrcDec->selProcInputDiff));
+      if (sErr) return DRC_DEC_PARAM_OUT_OF_RANGE;
+      break;
+    case DRC_DEC_BASE_CHANNEL_COUNT:
+      sErr = drcDec_SelectionProcess_SetParam(
+          hDrcDec->hSelectionProc, SEL_PROC_BASE_CHANNEL_COUNT, requestValue,
+          &(hDrcDec->selProcInputDiff));
+      if (sErr) return DRC_DEC_NOT_OK;
+      break;
+    case DRC_DEC_LOUDNESS_MEASUREMENT_METHOD:
+      sErr = drcDec_SelectionProcess_SetParam(
+          hDrcDec->hSelectionProc, SEL_PROC_LOUDNESS_MEASUREMENT_METHOD,
+          requestValue, &(hDrcDec->selProcInputDiff));
+      if (sErr) return DRC_DEC_PARAM_OUT_OF_RANGE;
+      break;
+    default:
+      return DRC_DEC_INVALID_PARAM;
+  }
+
+  /* All parameters need a new start of the selection process */
+  startSelectionProcess(hDrcDec);
+
+  return DRC_DEC_OK;
+}
+
+LONG FDK_drcDec_GetParam(HANDLE_DRC_DECODER hDrcDec,
+                         const DRC_DEC_USERPARAM requestType) {
+  if (hDrcDec == NULL) return DRC_DEC_NOT_OPENED;
+
+  switch (requestType) {
+    case DRC_DEC_BOOST:
+      return (LONG)hDrcDec->selProcOutput.boost;
+    case DRC_DEC_COMPRESS:
+      return (LONG)hDrcDec->selProcOutput.compress;
+    case DRC_DEC_IS_MULTIBAND_DRC_1:
+      return (LONG)bitstreamContainsMultibandDrc(&hDrcDec->uniDrcConfig, 0);
+    case DRC_DEC_IS_MULTIBAND_DRC_2:
+      return (LONG)bitstreamContainsMultibandDrc(&hDrcDec->uniDrcConfig, 0x7F);
+    case DRC_DEC_IS_ACTIVE: {
+      /* MPEG-D DRC is considered active (and overrides MPEG-4 DRC), if
+       * uniDrc payload is present (loudnessInfoSet and/or uniDrcConfig)
+       * at least one of DRC and Loudness Control is switched on */
+      int drcOn = drcDec_SelectionProcess_GetParam(
+          hDrcDec->hSelectionProc, SEL_PROC_DYNAMIC_RANGE_CONTROL_ON);
+      int lnOn = drcDec_SelectionProcess_GetParam(
+          hDrcDec->hSelectionProc, SEL_PROC_LOUDNESS_NORMALIZATION_ON);
+      int uniDrcPayloadPresent =
+          (hDrcDec->loudnessInfoSet.loudnessInfoCount > 0);
+      uniDrcPayloadPresent |=
+          (hDrcDec->loudnessInfoSet.loudnessInfoAlbumCount > 0);
+      uniDrcPayloadPresent |=
+          (hDrcDec->uniDrcConfig.drcInstructionsUniDrcCount > 0);
+      uniDrcPayloadPresent |=
+          (hDrcDec->uniDrcConfig.downmixInstructionsCount > 0);
+      return (LONG)(uniDrcPayloadPresent && (drcOn || lnOn));
+    }
+    case DRC_DEC_TARGET_CHANNEL_COUNT_SELECTED:
+      return (LONG)hDrcDec->selProcOutput.targetChannelCount;
+    default:
+      return 0;
+  }
+}
+
+DRC_DEC_ERROR
+FDK_drcDec_SetInterfaceParameters(HANDLE_DRC_DECODER hDrcDec,
+                                  HANDLE_UNI_DRC_INTERFACE hUniDrcInterface) {
+  return DRC_DEC_UNSUPPORTED_FUNCTION;
+}
+
+DRC_DEC_ERROR
+FDK_drcDec_SetSelectionProcessMpeghParameters_simple(
+    HANDLE_DRC_DECODER hDrcDec, const int groupPresetIdRequested,
+    const int numGroupIdsRequested, const int* groupIdsRequested) {
+  return DRC_DEC_UNSUPPORTED_FUNCTION;
+}
+
+DRC_DEC_ERROR
+FDK_drcDec_SetDownmixInstructions(HANDLE_DRC_DECODER hDrcDec,
+                                  const int numDownmixId, const int* downmixId,
+                                  const int* targetLayout,
+                                  const int* targetChannelCount) {
+  return DRC_DEC_UNSUPPORTED_FUNCTION;
+}
+
+void FDK_drcDec_SetSelectionProcessOutput(
+    HANDLE_DRC_DECODER hDrcDec, HANDLE_SEL_PROC_OUTPUT hSelProcOutput) {}
+
+HANDLE_SEL_PROC_OUTPUT
+FDK_drcDec_GetSelectionProcessOutput(HANDLE_DRC_DECODER hDrcDec) {
+  if (hDrcDec == NULL) return NULL;
+
+  return &(hDrcDec->selProcOutput);
+}
+
+LONG /* FIXP_DBL, e = 7 */
+FDK_drcDec_GetGroupLoudness(HANDLE_SEL_PROC_OUTPUT hSelProcOutput,
+                            const int groupID, int* groupLoudnessAvailable) {
+  return (LONG)0;
+}
+
+void FDK_drcDec_SetChannelGains(HANDLE_DRC_DECODER hDrcDec,
+                                const int numChannels, const int frameSize,
+                                FIXP_DBL* channelGainDb, FIXP_DBL* audioBuffer,
+                                const int audioBufferChannelOffset) {
+  int err;
+
+  if (hDrcDec == NULL) return;
+
+  err = drcDec_GainDecoder_SetLoudnessNormalizationGainDb(
+      hDrcDec->hGainDec, hDrcDec->selProcOutput.loudnessNormalizationGainDb);
+  if (err) return;
+
+  drcDec_GainDecoder_SetChannelGains(hDrcDec->hGainDec, numChannels, frameSize,
+                                     channelGainDb, audioBufferChannelOffset,
+                                     audioBuffer);
+}
+
+DRC_DEC_ERROR
+FDK_drcDec_ReadUniDrcConfig(HANDLE_DRC_DECODER hDrcDec,
+                            HANDLE_FDK_BITSTREAM hBitstream) {
+  DRC_ERROR dErr = DE_OK;
+
+  if (hDrcDec == NULL) return DRC_DEC_NOT_OPENED;
+
+  if (hDrcDec->codecMode == DRC_DEC_MPEG_D_USAC) {
+    dErr = drcDec_readUniDrcConfig(hBitstream, &(hDrcDec->uniDrcConfig));
+  } else
+    return DRC_DEC_NOT_OK;
+
+  if (dErr) {
+    /* clear config, if parsing error occured */
+    FDKmemclear(&hDrcDec->uniDrcConfig, sizeof(hDrcDec->uniDrcConfig));
+    hDrcDec->uniDrcConfig.diff = 1;
+  }
+
+  startSelectionProcess(hDrcDec);
+
+  return DRC_DEC_OK;
+}
+
+DRC_DEC_ERROR
+FDK_drcDec_ReadDownmixInstructions_Box(HANDLE_DRC_DECODER hDrcDec,
+                                       HANDLE_FDK_BITSTREAM hBitstream) {
+  DRC_ERROR dErr = DE_OK;
+
+  if (hDrcDec == NULL) return DRC_DEC_NOT_OPENED;
+
+  return DRC_DEC_NOT_OK;
+
+  if (dErr) {
+    /* clear config, if parsing error occurred */
+    FDKmemclear(&hDrcDec->uniDrcConfig.downmixInstructions,
+                sizeof(hDrcDec->uniDrcConfig.downmixInstructions));
+    hDrcDec->uniDrcConfig.downmixInstructionsCount = 0;
+    hDrcDec->uniDrcConfig.downmixInstructionsCountV0 = 0;
+    hDrcDec->uniDrcConfig.downmixInstructionsCountV1 = 0;
+    hDrcDec->uniDrcConfig.diff = 1;
+  }
+
+  startSelectionProcess(hDrcDec);
+
+  return DRC_DEC_OK;
+}
+
+DRC_DEC_ERROR
+FDK_drcDec_ReadUniDrcInstructions_Box(HANDLE_DRC_DECODER hDrcDec,
+                                      HANDLE_FDK_BITSTREAM hBitstream) {
+  DRC_ERROR dErr = DE_OK;
+
+  if (hDrcDec == NULL) return DRC_DEC_NOT_OPENED;
+
+  return DRC_DEC_NOT_OK;
+
+  if (dErr) {
+    /* clear config, if parsing error occurred */
+    FDKmemclear(&hDrcDec->uniDrcConfig.drcInstructionsUniDrc,
+                sizeof(hDrcDec->uniDrcConfig.drcInstructionsUniDrc));
+    hDrcDec->uniDrcConfig.drcInstructionsUniDrcCount = 0;
+    hDrcDec->uniDrcConfig.drcInstructionsUniDrcCountV0 = 0;
+    hDrcDec->uniDrcConfig.drcInstructionsUniDrcCountV1 = 0;
+    hDrcDec->uniDrcConfig.diff = 1;
+  }
+
+  startSelectionProcess(hDrcDec);
+
+  return DRC_DEC_OK;
+}
+
+DRC_DEC_ERROR
+FDK_drcDec_ReadUniDrcCoefficients_Box(HANDLE_DRC_DECODER hDrcDec,
+                                      HANDLE_FDK_BITSTREAM hBitstream) {
+  DRC_ERROR dErr = DE_OK;
+
+  if (hDrcDec == NULL) return DRC_DEC_NOT_OPENED;
+
+  return DRC_DEC_NOT_OK;
+
+  if (dErr) {
+    /* clear config, if parsing error occurred */
+    FDKmemclear(&hDrcDec->uniDrcConfig.drcCoefficientsUniDrc,
+                sizeof(hDrcDec->uniDrcConfig.drcCoefficientsUniDrc));
+    hDrcDec->uniDrcConfig.drcCoefficientsUniDrcCount = 0;
+    hDrcDec->uniDrcConfig.drcCoefficientsUniDrcCountV0 = 0;
+    hDrcDec->uniDrcConfig.drcCoefficientsUniDrcCountV1 = 0;
+    hDrcDec->uniDrcConfig.diff = 1;
+  }
+
+  startSelectionProcess(hDrcDec);
+
+  return DRC_DEC_OK;
+}
+
+DRC_DEC_ERROR
+FDK_drcDec_ReadLoudnessInfoSet(HANDLE_DRC_DECODER hDrcDec,
+                               HANDLE_FDK_BITSTREAM hBitstream) {
+  DRC_ERROR dErr = DE_OK;
+
+  if (hDrcDec == NULL) return DRC_DEC_NOT_OPENED;
+
+  if (hDrcDec->codecMode == DRC_DEC_MPEG_D_USAC) {
+    dErr = drcDec_readLoudnessInfoSet(hBitstream, &(hDrcDec->loudnessInfoSet));
+  } else
+    return DRC_DEC_NOT_OK;
+
+  if (dErr) {
+    /* clear config, if parsing error occurred */
+    FDKmemclear(&hDrcDec->loudnessInfoSet, sizeof(hDrcDec->loudnessInfoSet));
+    hDrcDec->loudnessInfoSet.diff = 1;
+  }
+
+  startSelectionProcess(hDrcDec);
+
+  return DRC_DEC_OK;
+}
+
+DRC_DEC_ERROR
+FDK_drcDec_ReadLoudnessBox(HANDLE_DRC_DECODER hDrcDec,
+                           HANDLE_FDK_BITSTREAM hBitstream) {
+  DRC_ERROR dErr = DE_OK;
+
+  if (hDrcDec == NULL) return DRC_DEC_NOT_OPENED;
+
+  return DRC_DEC_NOT_OK;
+
+  if (dErr) {
+    /* clear config, if parsing error occurred */
+    FDKmemclear(&hDrcDec->loudnessInfoSet, sizeof(hDrcDec->loudnessInfoSet));
+    hDrcDec->loudnessInfoSet.diff = 1;
+  }
+
+  startSelectionProcess(hDrcDec);
+
+  return DRC_DEC_OK;
+}
+
+DRC_DEC_ERROR
+FDK_drcDec_ReadUniDrcGain(HANDLE_DRC_DECODER hDrcDec,
+                          HANDLE_FDK_BITSTREAM hBitstream) {
+  DRC_ERROR dErr = DE_OK;
+
+  if (hDrcDec == NULL) return DRC_DEC_NOT_OPENED;
+  if (!hDrcDec->status) {
+    return DRC_DEC_OK;
+  }
+
+  dErr = drcDec_readUniDrcGain(
+      hBitstream, &(hDrcDec->uniDrcConfig),
+      drcDec_GainDecoder_GetFrameSize(hDrcDec->hGainDec),
+      drcDec_GainDecoder_GetDeltaTminDefault(hDrcDec->hGainDec),
+      &(hDrcDec->uniDrcGain));
+  if (dErr) return DRC_DEC_NOT_OK;
+
+  hDrcDec->status = DRC_DEC_NEW_GAIN_PAYLOAD;
+
+  return DRC_DEC_OK;
+}
+
+DRC_DEC_ERROR
+FDK_drcDec_ReadUniDrc(HANDLE_DRC_DECODER hDrcDec,
+                      HANDLE_FDK_BITSTREAM hBitstream) {
+  DRC_ERROR dErr = DE_OK;
+
+  if (hDrcDec == NULL) return DRC_DEC_NOT_OPENED;
+  if (!hDrcDec->status) return DRC_DEC_NOT_READY;
+
+  dErr = drcDec_readUniDrc(
+      hBitstream, &(hDrcDec->uniDrcConfig), &(hDrcDec->loudnessInfoSet),
+      drcDec_GainDecoder_GetFrameSize(hDrcDec->hGainDec),
+      drcDec_GainDecoder_GetDeltaTminDefault(hDrcDec->hGainDec),
+      &(hDrcDec->uniDrcGain));
+  if (dErr) return DRC_DEC_NOT_OK;
+
+  startSelectionProcess(hDrcDec);
+
+  hDrcDec->status = DRC_DEC_NEW_GAIN_PAYLOAD;
+
+  return DRC_DEC_OK;
+}
+
+DRC_DEC_ERROR
+FDK_drcDec_Preprocess(HANDLE_DRC_DECODER hDrcDec) {
+  DRC_ERROR dErr = DE_OK;
+
+  if (hDrcDec == NULL) return DRC_DEC_NOT_OPENED;
+  if (!hDrcDec->status) return DRC_DEC_NOT_READY;
+  if (!(hDrcDec->functionalRange & DRC_DEC_GAIN)) return DRC_DEC_NOT_OK;
+
+  if (hDrcDec->status != DRC_DEC_NEW_GAIN_PAYLOAD) {
+    /* no new gain payload was read, e.g. during concalment or flushing.
+       Generate DRC gains based on the stored DRC gains of last frames */
+    drcDec_GainDecoder_Conceal(hDrcDec->hGainDec, &(hDrcDec->uniDrcConfig),
+                               &(hDrcDec->uniDrcGain));
+  }
+
+  dErr = drcDec_GainDecoder_Preprocess(
+      hDrcDec->hGainDec, &(hDrcDec->uniDrcGain),
+      hDrcDec->selProcOutput.loudnessNormalizationGainDb,
+      hDrcDec->selProcOutput.boost, hDrcDec->selProcOutput.compress);
+  if (dErr) return DRC_DEC_NOT_OK;
+  hDrcDec->status = DRC_DEC_INTERPOLATION_PREPARED;
+
+  return DRC_DEC_OK;
+}
+
+DRC_DEC_ERROR
+FDK_drcDec_ProcessTime(HANDLE_DRC_DECODER hDrcDec, const int delaySamples,
+                       const DRC_DEC_LOCATION drcLocation,
+                       const int channelOffset, const int drcChannelOffset,
+                       const int numChannelsProcessed, FIXP_DBL* realBuffer,
+                       const int timeDataChannelOffset) {
+  DRC_ERROR dErr = DE_OK;
+
+  if (hDrcDec == NULL) return DRC_DEC_NOT_OPENED;
+  if (!(hDrcDec->functionalRange & DRC_DEC_GAIN)) return DRC_DEC_NOT_OK;
+  if (hDrcDec->status != DRC_DEC_INTERPOLATION_PREPARED)
+    return DRC_DEC_NOT_READY;
+
+  dErr = drcDec_GainDecoder_ProcessTimeDomain(
+      hDrcDec->hGainDec, delaySamples, (GAIN_DEC_LOCATION)drcLocation,
+      channelOffset, drcChannelOffset, numChannelsProcessed,
+      timeDataChannelOffset, realBuffer);
+  if (dErr) return DRC_DEC_NOT_OK;
+
+  return DRC_DEC_OK;
+}
+
+DRC_DEC_ERROR
+FDK_drcDec_ProcessFreq(HANDLE_DRC_DECODER hDrcDec, const int delaySamples,
+                       const DRC_DEC_LOCATION drcLocation,
+                       const int channelOffset, const int drcChannelOffset,
+                       const int numChannelsProcessed,
+                       const int processSingleTimeslot, FIXP_DBL** realBuffer,
+                       FIXP_DBL** imagBuffer) {
+  DRC_ERROR dErr = DE_OK;
+
+  if (hDrcDec == NULL) return DRC_DEC_NOT_OPENED;
+  if (!(hDrcDec->functionalRange & DRC_DEC_GAIN)) return DRC_DEC_NOT_OK;
+  if (hDrcDec->status != DRC_DEC_INTERPOLATION_PREPARED)
+    return DRC_DEC_NOT_READY;
+
+  dErr = drcDec_GainDecoder_ProcessSubbandDomain(
+      hDrcDec->hGainDec, delaySamples, (GAIN_DEC_LOCATION)drcLocation,
+      channelOffset, drcChannelOffset, numChannelsProcessed,
+      processSingleTimeslot, realBuffer, imagBuffer);
+  if (dErr) return DRC_DEC_NOT_OK;
+
+  return DRC_DEC_OK;
+}
+
+DRC_DEC_ERROR
+FDK_drcDec_ApplyDownmix(HANDLE_DRC_DECODER hDrcDec, int* reverseInChannelMap,
+                        int* reverseOutChannelMap, FIXP_DBL* realBuffer,
+                        int* pNChannels) {
+  SEL_PROC_OUTPUT* pSelProcOutput = &(hDrcDec->selProcOutput);
+  int baseChCnt = pSelProcOutput->baseChannelCount;
+  int targetChCnt = pSelProcOutput->targetChannelCount;
+  int frameSize, n, ic, oc;
+  FIXP_DBL tmp_out[8];
+  FIXP_DBL* audioChannels[8];
+
+  if (hDrcDec == NULL) return DRC_DEC_NOT_OPENED;
+  if (!(hDrcDec->functionalRange & DRC_DEC_GAIN)) return DRC_DEC_NOT_OK;
+
+  /* only downmix is performed here, no upmix.
+     Downmix is only performed if downmix coefficients are provided.
+     All other cases of downmix and upmix are treated by pcmDmx library. */
+  if (pSelProcOutput->downmixMatrixPresent == 0)
+    return DRC_DEC_OK;                             /* no downmix */
+  if (targetChCnt >= baseChCnt) return DRC_DEC_OK; /* downmix only */
+
+  /* sanity checks */
+  if (realBuffer == NULL) return DRC_DEC_NOT_OK;
+  if (reverseInChannelMap == NULL) return DRC_DEC_NOT_OK;
+  if (reverseOutChannelMap == NULL) return DRC_DEC_NOT_OK;
+  if (baseChCnt > 8) return DRC_DEC_NOT_OK;
+  if (baseChCnt != *pNChannels) return DRC_DEC_NOT_OK;
+  if (targetChCnt > 8) return DRC_DEC_NOT_OK;
+
+  frameSize = drcDec_GainDecoder_GetFrameSize(hDrcDec->hGainDec);
+
+  for (ic = 0; ic < baseChCnt; ic++) {
+    audioChannels[ic] = &(realBuffer[ic * frameSize]);
+  }
+
+  /* in-place downmix */
+  for (n = 0; n < frameSize; n++) {
+    for (oc = 0; oc < targetChCnt; oc++) {
+      tmp_out[oc] = (FIXP_DBL)0;
+      for (ic = 0; ic < baseChCnt; ic++) {
+        tmp_out[oc] +=
+            fMultDiv2(audioChannels[ic][n],
+                      pSelProcOutput->downmixMatrix[reverseInChannelMap[ic]]
+                                                   [reverseOutChannelMap[oc]])
+            << 3;
+      }
+    }
+    for (oc = 0; oc < targetChCnt; oc++) {
+      if (oc >= baseChCnt) break;
+      audioChannels[oc][n] = tmp_out[oc];
+    }
+  }
+
+  for (oc = targetChCnt; oc < baseChCnt; oc++) {
+    FDKmemset(audioChannels[oc], 0, frameSize * sizeof(FIXP_DBL));
+  }
+
+  *pNChannels = targetChCnt;
+
+  return DRC_DEC_OK;
+}
+
+/* Get library info for this module. */
+DRC_DEC_ERROR
+FDK_drcDec_GetLibInfo(LIB_INFO* info) {
+  int i;
+
+  if (info == NULL) {
+    return DRC_DEC_INVALID_PARAM;
+  }
+
+  /* Search for next free tab */
+  for (i = 0; i < FDK_MODULE_LAST; i++) {
+    if (info[i].module_id == FDK_NONE) break;
+  }
+  if (i == FDK_MODULE_LAST) {
+    return DRC_DEC_NOT_OK;
+  }
+
+  /* Add the library info */
+  info[i].module_id = FDK_UNIDRCDEC;
+  info[i].version = LIB_VERSION(DRCDEC_LIB_VL0, DRCDEC_LIB_VL1, DRCDEC_LIB_VL2);
+  LIB_VERSION_STRING(info + i);
+  info[i].build_date = DRCDEC_LIB_BUILD_DATE;
+  info[i].build_time = DRCDEC_LIB_BUILD_TIME;
+  info[i].title = DRCDEC_LIB_TITLE;
+
+  return DRC_DEC_OK;
+}
diff --git a/libDRCdec/src/drcDec_gainDecoder.cpp b/libDRCdec/src/drcDec_gainDecoder.cpp
new file mode 100644
index 0000000..ca81fad
--- /dev/null
+++ b/libDRCdec/src/drcDec_gainDecoder.cpp
@@ -0,0 +1,445 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+#include "drcDec_types.h"
+#include "drcDec_gainDecoder.h"
+#include "drcGainDec_preprocess.h"
+#include "drcGainDec_init.h"
+#include "drcGainDec_process.h"
+#include "drcDec_tools.h"
+
+/*******************************************/
+/* static functions                        */
+/*******************************************/
+
+static int _fitsLocation(DRC_INSTRUCTIONS_UNI_DRC* pInst,
+                         const GAIN_DEC_LOCATION drcLocation) {
+  int downmixId = pInst->drcApplyToDownmix ? pInst->downmixId[0] : 0;
+  switch (drcLocation) {
+    case GAIN_DEC_DRC1:
+      return (downmixId == 0);
+    case GAIN_DEC_DRC1_DRC2:
+      return ((downmixId == 0) || (downmixId == DOWNMIX_ID_ANY_DOWNMIX));
+    case GAIN_DEC_DRC2:
+      return (downmixId == DOWNMIX_ID_ANY_DOWNMIX);
+    case GAIN_DEC_DRC3:
+      return ((downmixId != 0) && (downmixId != DOWNMIX_ID_ANY_DOWNMIX));
+    case GAIN_DEC_DRC2_DRC3:
+      return (downmixId != 0);
+  }
+  return 0;
+}
+
+static void _setChannelGains(HANDLE_DRC_GAIN_DECODER hGainDec,
+                             const int numChannelGains,
+                             const FIXP_DBL* channelGainDb) {
+  int i, channelGain_e;
+  FIXP_DBL channelGain;
+  FDK_ASSERT(numChannelGains <= 8);
+  for (i = 0; i < numChannelGains; i++) {
+    if (channelGainDb[i] == (FIXP_DBL)MINVAL_DBL) {
+      hGainDec->channelGain[i] = (FIXP_DBL)0;
+    } else {
+      /* add loudness normalisation gain (dB) to channel gain (dB) */
+      FIXP_DBL tmp_channelGainDb = (channelGainDb[i] >> 1) +
+                                   (hGainDec->loudnessNormalisationGainDb >> 2);
+      tmp_channelGainDb =
+          SATURATE_LEFT_SHIFT(tmp_channelGainDb, 1, DFRACT_BITS);
+      channelGain = dB2lin(tmp_channelGainDb, 8, &channelGain_e);
+      hGainDec->channelGain[i] = scaleValue(channelGain, channelGain_e - 8);
+    }
+  }
+}
+
+/*******************************************/
+/* public functions                        */
+/*******************************************/
+
+DRC_ERROR
+drcDec_GainDecoder_Open(HANDLE_DRC_GAIN_DECODER* phGainDec) {
+  DRC_GAIN_DECODER* hGainDec = NULL;
+
+  hGainDec = (DRC_GAIN_DECODER*)FDKcalloc(1, sizeof(DRC_GAIN_DECODER));
+  if (hGainDec == NULL) return DE_MEMORY_ERROR;
+
+  hGainDec->multiBandActiveDrcIndex = -1;
+  hGainDec->channelGainActiveDrcIndex = -1;
+
+  *phGainDec = hGainDec;
+
+  return DE_OK;
+}
+
+DRC_ERROR
+drcDec_GainDecoder_Init(HANDLE_DRC_GAIN_DECODER hGainDec, const int frameSize,
+                        const int sampleRate) {
+  DRC_ERROR err = DE_OK;
+
+  err = initGainDec(hGainDec, frameSize, sampleRate);
+  if (err) return err;
+
+  initDrcGainBuffers(hGainDec->frameSize, &hGainDec->drcGainBuffers);
+
+  return err;
+}
+
+DRC_ERROR
+drcDec_GainDecoder_SetCodecDependentParameters(
+    HANDLE_DRC_GAIN_DECODER hGainDec, const DELAY_MODE delayMode,
+    const int timeDomainSupported,
+    const SUBBAND_DOMAIN_MODE subbandDomainSupported) {
+  if ((delayMode != DM_REGULAR_DELAY) && (delayMode != DM_LOW_DELAY)) {
+    return DE_NOT_OK;
+  }
+  hGainDec->delayMode = delayMode;
+  hGainDec->timeDomainSupported = timeDomainSupported;
+  hGainDec->subbandDomainSupported = subbandDomainSupported;
+
+  return DE_OK;
+}
+
+DRC_ERROR
+drcDec_GainDecoder_Config(HANDLE_DRC_GAIN_DECODER hGainDec,
+                          HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+                          const UCHAR numSelectedDrcSets,
+                          const SCHAR* selectedDrcSetIds,
+                          const UCHAR* selectedDownmixIds) {
+  DRC_ERROR err = DE_OK;
+  int a;
+
+  hGainDec->nActiveDrcs = 0;
+  hGainDec->multiBandActiveDrcIndex = -1;
+  hGainDec->channelGainActiveDrcIndex = -1;
+  for (a = 0; a < numSelectedDrcSets; a++) {
+    err = initActiveDrc(hGainDec, hUniDrcConfig, selectedDrcSetIds[a],
+                        selectedDownmixIds[a]);
+    if (err) return err;
+  }
+
+  err = initActiveDrcOffset(hGainDec);
+  if (err) return err;
+
+  return err;
+}
+
+DRC_ERROR
+drcDec_GainDecoder_Close(HANDLE_DRC_GAIN_DECODER* phGainDec) {
+  if (*phGainDec != NULL) {
+    FDKfree(*phGainDec);
+    *phGainDec = NULL;
+  }
+
+  return DE_OK;
+}
+
+DRC_ERROR
+drcDec_GainDecoder_Preprocess(HANDLE_DRC_GAIN_DECODER hGainDec,
+                              HANDLE_UNI_DRC_GAIN hUniDrcGain,
+                              const FIXP_DBL loudnessNormalizationGainDb,
+                              const FIXP_SGL boost, const FIXP_SGL compress) {
+  DRC_ERROR err = DE_OK;
+  int a, c;
+
+  /* lnbPointer is the index on the most recent node buffer */
+  hGainDec->drcGainBuffers.lnbPointer++;
+  if (hGainDec->drcGainBuffers.lnbPointer >= NUM_LNB_FRAMES)
+    hGainDec->drcGainBuffers.lnbPointer = 0;
+
+  for (a = 0; a < hGainDec->nActiveDrcs; a++) {
+    /* prepare gain interpolation of sequences used by copying and modifying
+     * nodes in node buffers */
+    err = prepareDrcGain(hGainDec, hUniDrcGain, compress, boost,
+                         loudnessNormalizationGainDb, a);
+    if (err) return err;
+  }
+
+  for (a = 0; a < MAX_ACTIVE_DRCS; a++) {
+    for (c = 0; c < 8; c++) {
+      hGainDec->activeDrc[a]
+          .lnbIndexForChannel[c][hGainDec->drcGainBuffers.lnbPointer] =
+          -1; /* "no DRC processing" */
+    }
+    hGainDec->activeDrc[a].subbandGainsReady = 0;
+  }
+
+  for (c = 0; c < 8; c++) {
+    hGainDec->drcGainBuffers
+        .channelGain[c][hGainDec->drcGainBuffers.lnbPointer] =
+        FL2FXCONST_DBL(1.0f / (float)(1 << 8));
+  }
+
+  return err;
+}
+
+/* create gain sequence out of gain sequences of last frame for concealment and
+ * flushing */
+DRC_ERROR
+drcDec_GainDecoder_Conceal(HANDLE_DRC_GAIN_DECODER hGainDec,
+                           HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+                           HANDLE_UNI_DRC_GAIN hUniDrcGain) {
+  int seq, gainSequenceCount;
+  DRC_COEFFICIENTS_UNI_DRC* pCoef =
+      selectDrcCoefficients(hUniDrcConfig, LOCATION_SELECTED);
+  if (pCoef == NULL) return DE_OK;
+
+  gainSequenceCount = fMin(pCoef->gainSequenceCount, (UCHAR)12);
+
+  for (seq = 0; seq < gainSequenceCount; seq++) {
+    int lastNodeIndex = 0;
+    FIXP_SGL lastGainDb = (FIXP_SGL)0;
+
+    lastNodeIndex = hUniDrcGain->nNodes[seq] - 1;
+    if ((lastNodeIndex >= 0) && (lastNodeIndex < 16)) {
+      lastGainDb = hUniDrcGain->gainNode[seq][lastNodeIndex].gainDb;
+    }
+
+    hUniDrcGain->nNodes[seq] = 1;
+    if (lastGainDb > (FIXP_SGL)0) {
+      hUniDrcGain->gainNode[seq][0].gainDb =
+          FX_DBL2FX_SGL(fMult(FL2FXCONST_SGL(0.9f), lastGainDb));
+    } else {
+      hUniDrcGain->gainNode[seq][0].gainDb =
+          FX_DBL2FX_SGL(fMult(FL2FXCONST_SGL(0.98f), lastGainDb));
+    }
+    hUniDrcGain->gainNode[seq][0].time = hGainDec->frameSize - 1;
+  }
+  return DE_OK;
+}
+
+void drcDec_GainDecoder_SetChannelGains(HANDLE_DRC_GAIN_DECODER hGainDec,
+                                        const int numChannels,
+                                        const int frameSize,
+                                        const FIXP_DBL* channelGainDb,
+                                        const int audioBufferChannelOffset,
+                                        FIXP_DBL* audioBuffer) {
+  int c, i;
+
+  if (hGainDec->channelGainActiveDrcIndex >= 0) {
+    /* channel gains will be applied in drcDec_GainDecoder_ProcessTimeDomain or
+     * drcDec_GainDecoder_ProcessSubbandDomain, respectively. */
+    _setChannelGains(hGainDec, numChannels, channelGainDb);
+
+    if (!hGainDec->status) { /* overwrite previous channel gains at startup */
+      DRC_GAIN_BUFFERS* pDrcGainBuffers = &hGainDec->drcGainBuffers;
+      for (c = 0; c < numChannels; c++) {
+        for (i = 0; i < NUM_LNB_FRAMES; i++) {
+          pDrcGainBuffers->channelGain[c][i] = hGainDec->channelGain[c];
+        }
+      }
+      hGainDec->status = 1;
+    }
+  } else {
+    /* smooth and apply channel gains */
+    FIXP_DBL prevChannelGain[8];
+    for (c = 0; c < numChannels; c++) {
+      prevChannelGain[c] = hGainDec->channelGain[c];
+    }
+
+    _setChannelGains(hGainDec, numChannels, channelGainDb);
+
+    if (!hGainDec->status) { /* overwrite previous channel gains at startup */
+      for (c = 0; c < numChannels; c++)
+        prevChannelGain[c] = hGainDec->channelGain[c];
+      hGainDec->status = 1;
+    }
+
+    for (c = 0; c < numChannels; c++) {
+      INT n_min = fMin(fMin(CntLeadingZeros(prevChannelGain[c]),
+                            CntLeadingZeros(hGainDec->channelGain[c])) -
+                           1,
+                       9);
+      FIXP_DBL gain = prevChannelGain[c] << n_min;
+      FIXP_DBL stepsize = ((hGainDec->channelGain[c] << n_min) - gain);
+      if (stepsize != (FIXP_DBL)0) {
+        if (frameSize == 1024)
+          stepsize = stepsize >> 10;
+        else
+          stepsize = (LONG)stepsize / frameSize;
+      }
+      n_min = 9 - n_min;
+#ifdef FUNCTION_drcDec_GainDecoder_SetChannelGains_func1
+      drcDec_GainDecoder_SetChannelGains_func1(audioBuffer, gain, stepsize,
+                                               n_min, frameSize);
+#else
+      for (i = 0; i < frameSize; i++) {
+        audioBuffer[i] = fMultDiv2(audioBuffer[i], gain) << n_min;
+        gain += stepsize;
+      }
+#endif
+      audioBuffer += audioBufferChannelOffset;
+    }
+  }
+}
+
+DRC_ERROR
+drcDec_GainDecoder_ProcessTimeDomain(
+    HANDLE_DRC_GAIN_DECODER hGainDec, const int delaySamples,
+    const GAIN_DEC_LOCATION drcLocation, const int channelOffset,
+    const int drcChannelOffset, const int numChannelsProcessed,
+    const int timeDataChannelOffset, FIXP_DBL* audioIOBuffer) {
+  DRC_ERROR err = DE_OK;
+  int a;
+
+  if (!hGainDec->timeDomainSupported) {
+    return DE_NOT_OK;
+  }
+
+  for (a = 0; a < hGainDec->nActiveDrcs; a++) {
+    if (!_fitsLocation(hGainDec->activeDrc[a].pInst, drcLocation)) continue;
+
+    /* Apply DRC */
+    err = processDrcTime(hGainDec, a, delaySamples, channelOffset,
+                         drcChannelOffset, numChannelsProcessed,
+                         timeDataChannelOffset, audioIOBuffer);
+    if (err) return err;
+  }
+
+  return err;
+}
+
+DRC_ERROR
+drcDec_GainDecoder_ProcessSubbandDomain(
+    HANDLE_DRC_GAIN_DECODER hGainDec, const int delaySamples,
+    const GAIN_DEC_LOCATION drcLocation, const int channelOffset,
+    const int drcChannelOffset, const int numChannelsProcessed,
+    const int processSingleTimeslot, FIXP_DBL* audioIOBufferReal[],
+    FIXP_DBL* audioIOBufferImag[]) {
+  DRC_ERROR err = DE_OK;
+  int a;
+
+  if (hGainDec->subbandDomainSupported == SDM_OFF) {
+    return DE_NOT_OK;
+  }
+
+  for (a = 0; a < hGainDec->nActiveDrcs; a++) {
+    if (!_fitsLocation(hGainDec->activeDrc[a].pInst, drcLocation)) continue;
+
+    /* Apply DRC */
+    err = processDrcSubband(hGainDec, a, delaySamples, channelOffset,
+                            drcChannelOffset, numChannelsProcessed,
+                            processSingleTimeslot, audioIOBufferReal,
+                            audioIOBufferImag);
+    if (err) return err;
+  }
+
+  return err;
+}
+
+DRC_ERROR
+drcDec_GainDecoder_SetLoudnessNormalizationGainDb(
+    HANDLE_DRC_GAIN_DECODER hGainDec, FIXP_DBL loudnessNormalizationGainDb) {
+  hGainDec->loudnessNormalisationGainDb = loudnessNormalizationGainDb;
+
+  return DE_OK;
+}
+
+int drcDec_GainDecoder_GetFrameSize(HANDLE_DRC_GAIN_DECODER hGainDec) {
+  if (hGainDec == NULL) return -1;
+
+  return hGainDec->frameSize;
+}
+
+int drcDec_GainDecoder_GetDeltaTminDefault(HANDLE_DRC_GAIN_DECODER hGainDec) {
+  if (hGainDec == NULL) return -1;
+
+  return hGainDec->deltaTminDefault;
+}
diff --git a/libDRCdec/src/drcDec_gainDecoder.h b/libDRCdec/src/drcDec_gainDecoder.h
new file mode 100644
index 0000000..2f4df4c
--- /dev/null
+++ b/libDRCdec/src/drcDec_gainDecoder.h
@@ -0,0 +1,264 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+#ifndef DRCDEC_GAINDECODER_H
+#define DRCDEC_GAINDECODER_H
+
+#include "drcDecoder.h"
+
+/* Definitions common to gainDecoder submodule */
+
+#define NUM_LNB_FRAMES                                                         \
+  5 /* previous frame + this frame + one frame for DM_REGULAR_DELAY + (maximum \
+       delaySamples)/frameSize */
+
+/* QMF64 */
+#define SUBBAND_NUM_BANDS_QMF64 64
+#define SUBBAND_DOWNSAMPLING_FACTOR_QMF64 64
+#define SUBBAND_ANALYSIS_DELAY_QMF64 320
+
+/* QMF71 (according to ISO/IEC 23003-1:2007) */
+#define SUBBAND_NUM_BANDS_QMF71 71
+#define SUBBAND_DOWNSAMPLING_FACTOR_QMF71 64
+#define SUBBAND_ANALYSIS_DELAY_QMF71 320 + 384
+
+/* STFT256 (according to ISO/IEC 23008-3:2015/AMD3) */
+#define SUBBAND_NUM_BANDS_STFT256 256
+#define SUBBAND_DOWNSAMPLING_FACTOR_STFT256 256
+#define SUBBAND_ANALYSIS_DELAY_STFT256 256
+
+typedef enum {
+  GAIN_DEC_DRC1,
+  GAIN_DEC_DRC1_DRC2,
+  GAIN_DEC_DRC2,
+  GAIN_DEC_DRC3,
+  GAIN_DEC_DRC2_DRC3
+} GAIN_DEC_LOCATION;
+
+typedef struct {
+  FIXP_DBL gainLin; /* e = 7 */
+  SHORT time;
+} NODE_LIN;
+
+typedef struct {
+  GAIN_INTERPOLATION_TYPE gainInterpolationType;
+  int nNodes[NUM_LNB_FRAMES]; /* number of nodes, saturated to 16 */
+  NODE_LIN linearNode[NUM_LNB_FRAMES][16];
+} LINEAR_NODE_BUFFER;
+
+typedef struct {
+  int lnbPointer;
+  LINEAR_NODE_BUFFER linearNodeBuffer[12];
+  LINEAR_NODE_BUFFER dummyLnb;
+  FIXP_DBL channelGain[8][NUM_LNB_FRAMES]; /* e = 8 */
+} DRC_GAIN_BUFFERS;
+
+typedef struct {
+  int activeDrcOffset;
+  DRC_INSTRUCTIONS_UNI_DRC* pInst;
+  DRC_COEFFICIENTS_UNI_DRC* pCoef;
+
+  DUCKING_MODIFICATION duckingModificationForChannelGroup[8];
+  SCHAR channelGroupForChannel[8];
+
+  UCHAR bandCountForChannelGroup[8];
+  UCHAR gainElementForGroup[8];
+  UCHAR channelGroupIsParametricDrc[8];
+  UCHAR gainElementCount; /* number of different DRC gains inluding all DRC
+                             bands */
+  int lnbIndexForChannel[8][NUM_LNB_FRAMES];
+  int subbandGainsReady;
+} ACTIVE_DRC;
+
+typedef struct {
+  int deltaTminDefault;
+  INT frameSize;
+  FIXP_DBL loudnessNormalisationGainDb;
+  DELAY_MODE delayMode;
+
+  int nActiveDrcs;
+  ACTIVE_DRC activeDrc[MAX_ACTIVE_DRCS];
+  int multiBandActiveDrcIndex;
+  int channelGainActiveDrcIndex;
+  FIXP_DBL channelGain[8]; /* e = 8 */
+
+  DRC_GAIN_BUFFERS drcGainBuffers;
+  FIXP_DBL subbandGains[12][4 * 1024 / 256];
+  FIXP_DBL dummySubbandGains[4 * 1024 / 256];
+
+  int status;
+  int timeDomainSupported;
+  SUBBAND_DOMAIN_MODE subbandDomainSupported;
+} DRC_GAIN_DECODER, *HANDLE_DRC_GAIN_DECODER;
+
+/* init functions */
+DRC_ERROR
+drcDec_GainDecoder_Open(HANDLE_DRC_GAIN_DECODER* phGainDec);
+
+DRC_ERROR
+drcDec_GainDecoder_Init(HANDLE_DRC_GAIN_DECODER hGainDec, const int frameSize,
+                        const int sampleRate);
+
+DRC_ERROR
+drcDec_GainDecoder_SetCodecDependentParameters(
+    HANDLE_DRC_GAIN_DECODER hGainDec, const DELAY_MODE delayMode,
+    const int timeDomainSupported,
+    const SUBBAND_DOMAIN_MODE subbandDomainSupported);
+
+DRC_ERROR
+drcDec_GainDecoder_Config(HANDLE_DRC_GAIN_DECODER hGainDec,
+                          HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+                          const UCHAR numSelectedDrcSets,
+                          const SCHAR* selectedDrcSetIds,
+                          const UCHAR* selectedDownmixIds);
+
+/* close functions */
+DRC_ERROR
+drcDec_GainDecoder_Close(HANDLE_DRC_GAIN_DECODER* phGainDec);
+
+/* process functions */
+
+/* call drcDec_GainDecoder_Preprocess first */
+DRC_ERROR
+drcDec_GainDecoder_Preprocess(HANDLE_DRC_GAIN_DECODER hGainDec,
+                              HANDLE_UNI_DRC_GAIN hUniDrcGain,
+                              const FIXP_DBL loudnessNormalizationGainDb,
+                              const FIXP_SGL boost, const FIXP_SGL compress);
+
+/* Then call one of drcDec_GainDecoder_ProcessTimeDomain or
+ * drcDec_GainDecoder_ProcessSubbandDomain */
+DRC_ERROR
+drcDec_GainDecoder_ProcessTimeDomain(
+    HANDLE_DRC_GAIN_DECODER hGainDec, const int delaySamples,
+    const GAIN_DEC_LOCATION drcLocation, const int channelOffset,
+    const int drcChannelOffset, const int numChannelsProcessed,
+    const int timeDataChannelOffset, FIXP_DBL* audioIOBuffer);
+
+DRC_ERROR
+drcDec_GainDecoder_ProcessSubbandDomain(
+    HANDLE_DRC_GAIN_DECODER hGainDec, const int delaySamples,
+    GAIN_DEC_LOCATION drcLocation, const int channelOffset,
+    const int drcChannelOffset, const int numChannelsProcessed,
+    const int processSingleTimeslot, FIXP_DBL* audioIOBufferReal[],
+    FIXP_DBL* audioIOBufferImag[]);
+
+DRC_ERROR
+drcDec_GainDecoder_Conceal(HANDLE_DRC_GAIN_DECODER hGainDec,
+                           HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+                           HANDLE_UNI_DRC_GAIN hUniDrcGain);
+
+DRC_ERROR
+drcDec_GainDecoder_SetLoudnessNormalizationGainDb(
+    HANDLE_DRC_GAIN_DECODER hGainDec, FIXP_DBL loudnessNormalizationGainDb);
+
+int drcDec_GainDecoder_GetFrameSize(HANDLE_DRC_GAIN_DECODER hGainDec);
+
+int drcDec_GainDecoder_GetDeltaTminDefault(HANDLE_DRC_GAIN_DECODER hGainDec);
+
+void drcDec_GainDecoder_SetChannelGains(HANDLE_DRC_GAIN_DECODER hGainDec,
+                                        const int numChannels,
+                                        const int frameSize,
+                                        const FIXP_DBL* channelGainDb,
+                                        const int audioBufferChannelOffset,
+                                        FIXP_DBL* audioBuffer);
+
+#endif
diff --git a/libDRCdec/src/drcDec_reader.cpp b/libDRCdec/src/drcDec_reader.cpp
new file mode 100644
index 0000000..db5fab7
--- /dev/null
+++ b/libDRCdec/src/drcDec_reader.cpp
@@ -0,0 +1,2027 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+#include "fixpoint_math.h"
+#include "drcDec_reader.h"
+#include "drcDec_tools.h"
+#include "drcDec_rom.h"
+#include "drcDecoder.h"
+
+/* MPEG-D DRC AMD 1 */
+
+#define UNIDRCCONFEXT_PARAM_DRC 0x1
+#define UNIDRCCONFEXT_V1 0x2
+#define UNIDRCLOUDEXT_EQ 0x1
+
+#define UNIDRCGAINEXT_TERM 0x0
+#define UNIDRCLOUDEXT_TERM 0x0
+#define UNIDRCCONFEXT_TERM 0x0
+
+static int _getZ(const int nNodesMax) {
+  /* Z is the minimum codeword length that is needed to encode all possible
+   * timeDelta values */
+  /* Z = ceil(log2(2*nNodesMax)) */
+  int Z = 1;
+  while ((1 << Z) < (2 * nNodesMax)) {
+    Z++;
+  }
+  return Z;
+}
+
+static int _getTimeDeltaMin(const GAIN_SET* pGset, const int deltaTminDefault) {
+  if (pGset->timeDeltaMinPresent) {
+    return pGset->timeDeltaMin;
+  } else {
+    return deltaTminDefault;
+  }
+}
+
+/* compare and assign */
+static inline int _compAssign(UCHAR* dest, const UCHAR src) {
+  int diff = 0;
+  if (*dest != src) diff = 1;
+  *dest = src;
+  return diff;
+}
+
+static inline int _compAssign(ULONG* dest, const ULONG src) {
+  int diff = 0;
+  if (*dest != src) diff = 1;
+  *dest = src;
+  return diff;
+}
+
+typedef const SCHAR (*Huffman)[2];
+
+int _decodeHuffmanCW(Huffman h, /*!< pointer to huffman codebook table */
+                     HANDLE_FDK_BITSTREAM hBs) /*!< Handle to bitbuffer */
+{
+  SCHAR index = 0;
+  int value, bit;
+
+  while (index >= 0) {
+    bit = FDKreadBits(hBs, 1);
+    index = h[index][bit];
+  }
+
+  value = index + 64; /* Add offset */
+
+  return value;
+}
+
+/**********/
+/* uniDrc */
+/**********/
+
+DRC_ERROR
+drcDec_readUniDrc(HANDLE_FDK_BITSTREAM hBs, HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+                  HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet,
+                  const int frameSize, const int deltaTminDefault,
+                  HANDLE_UNI_DRC_GAIN hUniDrcGain) {
+  DRC_ERROR err = DE_OK;
+  int loudnessInfoSetPresent, uniDrcConfigPresent;
+
+  loudnessInfoSetPresent = FDKreadBits(hBs, 1);
+  if (loudnessInfoSetPresent) {
+    uniDrcConfigPresent = FDKreadBits(hBs, 1);
+    if (uniDrcConfigPresent) {
+      err = drcDec_readUniDrcConfig(hBs, hUniDrcConfig);
+      if (err) return err;
+    }
+    err = drcDec_readLoudnessInfoSet(hBs, hLoudnessInfoSet);
+    if (err) return err;
+  }
+
+  if (hUniDrcGain != NULL) {
+    err = drcDec_readUniDrcGain(hBs, hUniDrcConfig, frameSize, deltaTminDefault,
+                                hUniDrcGain);
+    if (err) return err;
+  }
+
+  return err;
+}
+
+/**************/
+/* uniDrcGain */
+/**************/
+
+static FIXP_SGL _decodeGainInitial(
+    HANDLE_FDK_BITSTREAM hBs, const GAIN_CODING_PROFILE gainCodingProfile) {
+  int sign, magn;
+  FIXP_SGL gainInitial = (FIXP_SGL)0;
+  switch (gainCodingProfile) {
+    case GCP_REGULAR:
+      sign = FDKreadBits(hBs, 1);
+      magn = FDKreadBits(hBs, 8);
+
+      gainInitial =
+          (FIXP_SGL)(magn << (FRACT_BITS - 1 - 3 - 7)); /* magn * 0.125; */
+      if (sign) gainInitial = -gainInitial;
+      break;
+    case GCP_FADING:
+      sign = FDKreadBits(hBs, 1);
+      if (sign == 0)
+        gainInitial = (FIXP_SGL)0;
+      else {
+        magn = FDKreadBits(hBs, 10);
+        gainInitial = -(FIXP_SGL)(
+            (magn + 1) << (FRACT_BITS - 1 - 3 - 7)); /* - (magn + 1) * 0.125; */
+      }
+      break;
+    case GCP_CLIPPING_DUCKING:
+      sign = FDKreadBits(hBs, 1);
+      if (sign == 0)
+        gainInitial = (FIXP_SGL)0;
+      else {
+        magn = FDKreadBits(hBs, 8);
+        gainInitial = -(FIXP_SGL)(
+            (magn + 1) << (FRACT_BITS - 1 - 3 - 7)); /* - (magn + 1) * 0.125; */
+      }
+      break;
+    case GCP_CONSTANT:
+      break;
+  }
+  return gainInitial;
+}
+
+static int _decodeNNodes(HANDLE_FDK_BITSTREAM hBs) {
+  int nNodes = 0, endMarker = 0;
+
+  /* decode number of nodes */
+  while (endMarker != 1) {
+    nNodes++;
+    if (nNodes >= 128) break;
+    endMarker = FDKreadBits(hBs, 1);
+  }
+  return nNodes;
+}
+
+static void _decodeGains(HANDLE_FDK_BITSTREAM hBs,
+                         const GAIN_CODING_PROFILE gainCodingProfile,
+                         const int nNodes, GAIN_NODE* pNodes) {
+  int k, deltaGain;
+  Huffman deltaGainCodebook;
+
+  pNodes[0].gainDb = _decodeGainInitial(hBs, gainCodingProfile);
+
+  if (gainCodingProfile == GCP_CLIPPING_DUCKING) {
+    deltaGainCodebook = (Huffman)&deltaGain_codingProfile_2_huffman;
+  } else {
+    deltaGainCodebook = (Huffman)&deltaGain_codingProfile_0_1_huffman;
+  }
+
+  for (k = 1; k < nNodes; k++) {
+    deltaGain = _decodeHuffmanCW(deltaGainCodebook, hBs);
+    if (k >= 16) continue;
+    /* gain_dB_e = 7 */
+    pNodes[k].gainDb =
+        pNodes[k - 1].gainDb +
+        (FIXP_SGL)(deltaGain << (FRACT_BITS - 1 - 7 -
+                                 3)); /* pNodes[k-1].gainDb + 0.125*deltaGain */
+  }
+}
+
+static void _decodeSlopes(HANDLE_FDK_BITSTREAM hBs,
+                          const GAIN_INTERPOLATION_TYPE gainInterpolationType,
+                          const int nNodes, GAIN_NODE* pNodes) {
+  int k = 0;
+
+  if (gainInterpolationType == GIT_SPLINE) {
+    /* decode slope steepness */
+    for (k = 0; k < nNodes; k++) {
+      _decodeHuffmanCW((Huffman)&slopeSteepness_huffman, hBs);
+    }
+  }
+}
+
+static int _decodeTimeDelta(HANDLE_FDK_BITSTREAM hBs, const int Z) {
+  int prefix, mu;
+
+  prefix = FDKreadBits(hBs, 2);
+  switch (prefix) {
+    case 0x0:
+      return 1;
+    case 0x1:
+      mu = FDKreadBits(hBs, 2);
+      return mu + 2;
+    case 0x2:
+      mu = FDKreadBits(hBs, 3);
+      return mu + 6;
+    case 0x3:
+      mu = FDKreadBits(hBs, Z);
+      return mu + 14;
+    default:
+      return 0;
+  }
+}
+
+static void _decodeTimes(HANDLE_FDK_BITSTREAM hBs, const int deltaTmin,
+                         const int frameSize, const int fullFrame,
+                         const int timeOffset, const int Z, const int nNodes,
+                         GAIN_NODE* pNodes) {
+  int timeDelta, k;
+  int timeOffs = timeOffset;
+  int frameEndFlag, nodeTimeTmp, nodeResFlag;
+
+  if (fullFrame == 0) {
+    frameEndFlag = FDKreadBits(hBs, 1);
+  } else {
+    frameEndFlag = 1;
+  }
+
+  if (frameEndFlag ==
+      1) { /* frameEndFlag == 1 signals that the last node is at the end of the
+              DRC frame */
+    nodeResFlag = 0;
+    for (k = 0; k < nNodes - 1; k++) {
+      /* decode a delta time value */
+      timeDelta = _decodeTimeDelta(hBs, Z);
+      if (k >= (16 - 1)) continue;
+      /* frameEndFlag == 1 needs special handling for last node with node
+       * reservoir */
+      nodeTimeTmp = timeOffs + timeDelta * deltaTmin;
+      if (nodeTimeTmp > frameSize + timeOffset) {
+        if (nodeResFlag == 0) {
+          pNodes[k].time = frameSize + timeOffset;
+          nodeResFlag = 1;
+        }
+        pNodes[k + 1].time = nodeTimeTmp;
+      } else {
+        pNodes[k].time = nodeTimeTmp;
+      }
+      timeOffs = nodeTimeTmp;
+    }
+    if (nodeResFlag == 0) {
+      k = fMin(k, 16 - 1);
+      pNodes[k].time = frameSize + timeOffset;
+    }
+  } else {
+    for (k = 0; k < nNodes; k++) {
+      /* decode a delta time value */
+      timeDelta = _decodeTimeDelta(hBs, Z);
+      if (k >= 16) continue;
+      pNodes[k].time = timeOffs + timeDelta * deltaTmin;
+      timeOffs = pNodes[k].time;
+    }
+  }
+}
+
+static void _readNodes(HANDLE_FDK_BITSTREAM hBs, GAIN_SET* gainSet,
+                       const int frameSize, const int timeDeltaMin,
+                       UCHAR* pNNodes, GAIN_NODE* pNodes) {
+  int timeOffset, drcGainCodingMode, nNodes;
+  int Z = _getZ(frameSize / timeDeltaMin);
+  if (gainSet->timeAlignment == 0) {
+    timeOffset = -1;
+  } else {
+    timeOffset = -timeDeltaMin +
+                 (timeDeltaMin - 1) /
+                     2; /* timeOffset = - deltaTmin + floor((deltaTmin-1)/2); */
+  }
+
+  drcGainCodingMode = FDKreadBits(hBs, 1);
+  if (drcGainCodingMode == 0) {
+    /* "simple" mode: only one node at the end of the frame with slope = 0 */
+    nNodes = 1;
+    pNodes[0].gainDb = _decodeGainInitial(
+        hBs, (GAIN_CODING_PROFILE)gainSet->gainCodingProfile);
+    pNodes[0].time = frameSize + timeOffset;
+  } else {
+    nNodes = _decodeNNodes(hBs);
+
+    _decodeSlopes(hBs, (GAIN_INTERPOLATION_TYPE)gainSet->gainInterpolationType,
+                  nNodes, pNodes);
+
+    _decodeTimes(hBs, timeDeltaMin, frameSize, gainSet->fullFrame, timeOffset,
+                 Z, nNodes, pNodes);
+
+    _decodeGains(hBs, (GAIN_CODING_PROFILE)gainSet->gainCodingProfile, nNodes,
+                 pNodes);
+  }
+  *pNNodes = (UCHAR)nNodes;
+}
+
+static void _readDrcGainSequence(HANDLE_FDK_BITSTREAM hBs, GAIN_SET* gainSet,
+                                 const int frameSize, const int timeDeltaMin,
+                                 UCHAR* pNNodes, GAIN_NODE pNodes[16]) {
+  SHORT timeBufPrevFrame[16], timeBufCurFrame[16];
+  int nNodesNodeRes, nNodesCur, k, m;
+
+  if (gainSet->gainCodingProfile == GCP_CONSTANT) {
+    *pNNodes = 1;
+    pNodes[0].time = frameSize - 1;
+    pNodes[0].gainDb = (FIXP_SGL)0;
+  } else {
+    _readNodes(hBs, gainSet, frameSize, timeDeltaMin, pNNodes, pNodes);
+
+    /* count number of nodes in node reservoir */
+    nNodesNodeRes = 0;
+    nNodesCur = 0;
+    /* count and buffer nodes from node reservoir */
+    for (k = 0; k < *pNNodes; k++) {
+      if (k >= 16) continue;
+      if (pNodes[k].time >= frameSize) {
+        /* write node reservoir times into buffer */
+        timeBufPrevFrame[nNodesNodeRes] = pNodes[k].time;
+        nNodesNodeRes++;
+      } else { /* times from current frame */
+        timeBufCurFrame[nNodesCur] = pNodes[k].time;
+        nNodesCur++;
+      }
+    }
+    /* compose right time order (bit reservoir first) */
+    for (k = 0; k < nNodesNodeRes; k++) {
+      /* subtract two time frameSize: one to remove node reservoir offset and
+       * one to get the negative index relative to the current frame
+       */
+      pNodes[k].time = timeBufPrevFrame[k] - 2 * frameSize;
+    }
+    /* ...and times from current frame */
+    for (m = 0; m < nNodesCur; m++, k++) {
+      pNodes[k].time = timeBufCurFrame[m];
+    }
+  }
+}
+
+static DRC_ERROR _readUniDrcGainExtension(HANDLE_FDK_BITSTREAM hBs,
+                                          UNI_DRC_GAIN_EXTENSION* pExt) {
+  DRC_ERROR err = DE_OK;
+  int k, bitSizeLen, extSizeBits, bitSize;
+
+  k = 0;
+  pExt->uniDrcGainExtType[k] = FDKreadBits(hBs, 4);
+  while (pExt->uniDrcGainExtType[k] != UNIDRCGAINEXT_TERM) {
+    if (k >= (8 - 1)) return DE_MEMORY_ERROR;
+    bitSizeLen = FDKreadBits(hBs, 3);
+    extSizeBits = bitSizeLen + 4;
+
+    bitSize = FDKreadBits(hBs, extSizeBits);
+    pExt->extBitSize[k] = bitSize + 1;
+
+    switch (pExt->uniDrcGainExtType[k]) {
+      /* add future extensions here */
+      default:
+        FDKpushFor(hBs, pExt->extBitSize[k]);
+        break;
+    }
+    k++;
+    pExt->uniDrcGainExtType[k] = FDKreadBits(hBs, 4);
+  }
+
+  return err;
+}
+
+DRC_ERROR
+drcDec_readUniDrcGain(HANDLE_FDK_BITSTREAM hBs,
+                      HANDLE_UNI_DRC_CONFIG hUniDrcConfig, const int frameSize,
+                      const int deltaTminDefault,
+                      HANDLE_UNI_DRC_GAIN hUniDrcGain) {
+  DRC_ERROR err = DE_OK;
+  int seq, gainSequenceCount;
+  DRC_COEFFICIENTS_UNI_DRC* pCoef =
+      selectDrcCoefficients(hUniDrcConfig, LOCATION_SELECTED);
+  if (pCoef == NULL) return DE_OK;
+  if (hUniDrcGain == NULL) return DE_OK; /* hUniDrcGain not initialized yet */
+
+  gainSequenceCount = fMin(pCoef->gainSequenceCount, (UCHAR)12);
+
+  for (seq = 0; seq < gainSequenceCount; seq++) {
+    UCHAR index = pCoef->gainSetIndexForGainSequence[seq];
+    GAIN_SET* gainSet;
+    int timeDeltaMin;
+    UCHAR tmpNNodes = 0;
+    GAIN_NODE tmpNodes[16];
+
+    if ((index >= pCoef->gainSetCount) || (index >= 12)) return DE_NOT_OK;
+    gainSet = &(pCoef->gainSet[index]);
+
+    timeDeltaMin = _getTimeDeltaMin(gainSet, deltaTminDefault);
+
+    _readDrcGainSequence(hBs, gainSet, frameSize, timeDeltaMin, &tmpNNodes,
+                         tmpNodes);
+
+    hUniDrcGain->nNodes[seq] = tmpNNodes;
+    FDKmemcpy(hUniDrcGain->gainNode[seq], tmpNodes,
+              fMin(tmpNNodes, (UCHAR)16) * sizeof(GAIN_NODE));
+  }
+
+  hUniDrcGain->uniDrcGainExtPresent = FDKreadBits(hBs, 1);
+  if (hUniDrcGain->uniDrcGainExtPresent == 1) {
+    err = _readUniDrcGainExtension(hBs, &(hUniDrcGain->uniDrcGainExtension));
+    if (err) return err;
+  }
+
+  return err;
+}
+
+/****************/
+/* uniDrcConfig */
+/****************/
+
+static void _decodeDuckingModification(HANDLE_FDK_BITSTREAM hBs,
+                                       DUCKING_MODIFICATION* pDMod, int isBox) {
+  int bsDuckingScaling, sigma, mu;
+
+  if (isBox) FDKpushFor(hBs, 7); /* reserved */
+  pDMod->duckingScalingPresent = FDKreadBits(hBs, 1);
+
+  if (pDMod->duckingScalingPresent) {
+    if (isBox) FDKpushFor(hBs, 4); /* reserved */
+    bsDuckingScaling = FDKreadBits(hBs, 4);
+    sigma = bsDuckingScaling >> 3;
+    mu = bsDuckingScaling & 0x7;
+
+    if (sigma) {
+      pDMod->duckingScaling = (FIXP_SGL)(
+          (7 - mu) << (FRACT_BITS - 1 - 3 - 2)); /* 1.0 - 0.125 * (1 + mu); */
+    } else {
+      pDMod->duckingScaling = (FIXP_SGL)(
+          (9 + mu) << (FRACT_BITS - 1 - 3 - 2)); /* 1.0 + 0.125 * (1 + mu); */
+    }
+  } else {
+    pDMod->duckingScaling = (FIXP_SGL)(1 << (FRACT_BITS - 1 - 2)); /* 1.0 */
+  }
+}
+
+static void _decodeGainModification(HANDLE_FDK_BITSTREAM hBs, const int version,
+                                    int bandCount, GAIN_MODIFICATION* pGMod,
+                                    int isBox) {
+  int sign, bsGainOffset, bsAttenuationScaling, bsAmplificationScaling;
+
+  if (version > 0) {
+    int b, shapeFilterPresent;
+
+    if (isBox) {
+      FDKpushFor(hBs, 4); /* reserved */
+      bandCount = FDKreadBits(hBs, 4);
+    }
+
+    for (b = 0; b < bandCount; b++) {
+      if (isBox) {
+        FDKpushFor(hBs, 4); /* reserved */
+        pGMod[b].targetCharacteristicLeftPresent = FDKreadBits(hBs, 1);
+        pGMod[b].targetCharacteristicRightPresent = FDKreadBits(hBs, 1);
+        pGMod[b].gainScalingPresent = FDKreadBits(hBs, 1);
+        pGMod[b].gainOffsetPresent = FDKreadBits(hBs, 1);
+      }
+
+      if (!isBox)
+        pGMod[b].targetCharacteristicLeftPresent = FDKreadBits(hBs, 1);
+      if (pGMod[b].targetCharacteristicLeftPresent) {
+        if (isBox) FDKpushFor(hBs, 4); /* reserved */
+        pGMod[b].targetCharacteristicLeftIndex = FDKreadBits(hBs, 4);
+      }
+      if (!isBox)
+        pGMod[b].targetCharacteristicRightPresent = FDKreadBits(hBs, 1);
+      if (pGMod[b].targetCharacteristicRightPresent) {
+        if (isBox) FDKpushFor(hBs, 4); /* reserved */
+        pGMod[b].targetCharacteristicRightIndex = FDKreadBits(hBs, 4);
+      }
+      if (!isBox) pGMod[b].gainScalingPresent = FDKreadBits(hBs, 1);
+      if (pGMod[b].gainScalingPresent) {
+        bsAttenuationScaling = FDKreadBits(hBs, 4);
+        pGMod[b].attenuationScaling = (FIXP_SGL)(
+            bsAttenuationScaling
+            << (FRACT_BITS - 1 - 3 - 2)); /* bsAttenuationScaling * 0.125; */
+        bsAmplificationScaling = FDKreadBits(hBs, 4);
+        pGMod[b].amplificationScaling = (FIXP_SGL)(
+            bsAmplificationScaling
+            << (FRACT_BITS - 1 - 3 - 2)); /* bsAmplificationScaling * 0.125; */
+      }
+      if (!isBox) pGMod[b].gainOffsetPresent = FDKreadBits(hBs, 1);
+      if (pGMod[b].gainOffsetPresent) {
+        if (isBox) FDKpushFor(hBs, 2); /* reserved */
+        sign = FDKreadBits(hBs, 1);
+        bsGainOffset = FDKreadBits(hBs, 5);
+        pGMod[b].gainOffset = (FIXP_SGL)(
+            (1 + bsGainOffset)
+            << (FRACT_BITS - 1 - 2 - 4)); /* (1+bsGainOffset) * 0.25; */
+        if (sign) {
+          pGMod[b].gainOffset = -pGMod[b].gainOffset;
+        }
+      }
+    }
+    if (bandCount == 1) {
+      shapeFilterPresent = FDKreadBits(hBs, 1);
+      if (shapeFilterPresent) {
+        if (isBox) FDKpushFor(hBs, 3); /* reserved */
+        FDKpushFor(hBs, 4);            /* pGMod->shapeFilterIndex */
+      } else {
+        if (isBox) FDKpushFor(hBs, 7); /* reserved */
+      }
+    }
+  } else {
+    int b, gainScalingPresent, gainOffsetPresent;
+    FIXP_SGL attenuationScaling = FL2FXCONST_SGL(1.0f / (float)(1 << 2)),
+             amplificationScaling = FL2FXCONST_SGL(1.0f / (float)(1 << 2)),
+             gainOffset = (FIXP_SGL)0;
+    if (isBox) FDKpushFor(hBs, 7); /* reserved */
+    gainScalingPresent = FDKreadBits(hBs, 1);
+    if (gainScalingPresent) {
+      bsAttenuationScaling = FDKreadBits(hBs, 4);
+      attenuationScaling = (FIXP_SGL)(
+          bsAttenuationScaling
+          << (FRACT_BITS - 1 - 3 - 2)); /* bsAttenuationScaling * 0.125; */
+      bsAmplificationScaling = FDKreadBits(hBs, 4);
+      amplificationScaling = (FIXP_SGL)(
+          bsAmplificationScaling
+          << (FRACT_BITS - 1 - 3 - 2)); /* bsAmplificationScaling * 0.125; */
+    }
+    if (isBox) FDKpushFor(hBs, 7); /* reserved */
+    gainOffsetPresent = FDKreadBits(hBs, 1);
+    if (gainOffsetPresent) {
+      if (isBox) FDKpushFor(hBs, 2); /* reserved */
+      sign = FDKreadBits(hBs, 1);
+      bsGainOffset = FDKreadBits(hBs, 5);
+      gainOffset =
+          (FIXP_SGL)((1 + bsGainOffset) << (FRACT_BITS - 1 - 2 -
+                                            4)); /* (1+bsGainOffset) * 0.25; */
+      if (sign) {
+        gainOffset = -gainOffset;
+      }
+    }
+    for (b = 0; b < 4; b++) {
+      pGMod[b].targetCharacteristicLeftPresent = 0;
+      pGMod[b].targetCharacteristicRightPresent = 0;
+      pGMod[b].gainScalingPresent = gainScalingPresent;
+      pGMod[b].attenuationScaling = attenuationScaling;
+      pGMod[b].amplificationScaling = amplificationScaling;
+      pGMod[b].gainOffsetPresent = gainOffsetPresent;
+      pGMod[b].gainOffset = gainOffset;
+    }
+  }
+}
+
+static void _readDrcCharacteristic(HANDLE_FDK_BITSTREAM hBs, const int version,
+                                   DRC_CHARACTERISTIC* pDChar, int isBox) {
+  if (version == 0) {
+    if (isBox) FDKpushFor(hBs, 1); /* reserved */
+    pDChar->cicpIndex = FDKreadBits(hBs, 7);
+    if (pDChar->cicpIndex > 0) {
+      pDChar->present = 1;
+      pDChar->isCICP = 1;
+    } else {
+      pDChar->present = 0;
+    }
+  } else {
+    pDChar->present = FDKreadBits(hBs, 1);
+    if (isBox) pDChar->isCICP = FDKreadBits(hBs, 1);
+    if (pDChar->present) {
+      if (!isBox) pDChar->isCICP = FDKreadBits(hBs, 1);
+      if (pDChar->isCICP) {
+        if (isBox) FDKpushFor(hBs, 1); /* reserved */
+        pDChar->cicpIndex = FDKreadBits(hBs, 7);
+      } else {
+        pDChar->custom.left = FDKreadBits(hBs, 4);
+        pDChar->custom.right = FDKreadBits(hBs, 4);
+      }
+    }
+  }
+}
+
+static void _readBandBorder(HANDLE_FDK_BITSTREAM hBs, BAND_BORDER* pBBord,
+                            int drcBandType, int isBox) {
+  if (drcBandType) {
+    if (isBox) FDKpushFor(hBs, 4); /* reserved */
+    pBBord->crossoverFreqIndex = FDKreadBits(hBs, 4);
+  } else {
+    if (isBox) FDKpushFor(hBs, 6); /* reserved */
+    pBBord->startSubBandIndex = FDKreadBits(hBs, 10);
+  }
+}
+
+static DRC_ERROR _readGainSet(HANDLE_FDK_BITSTREAM hBs, const int version,
+                              int* gainSequenceIndex, GAIN_SET* pGSet,
+                              int isBox) {
+  if (isBox) FDKpushFor(hBs, 2); /* reserved */
+  pGSet->gainCodingProfile = FDKreadBits(hBs, 2);
+  pGSet->gainInterpolationType = FDKreadBits(hBs, 1);
+  pGSet->fullFrame = FDKreadBits(hBs, 1);
+  pGSet->timeAlignment = FDKreadBits(hBs, 1);
+  pGSet->timeDeltaMinPresent = FDKreadBits(hBs, 1);
+
+  if (pGSet->timeDeltaMinPresent) {
+    int bsTimeDeltaMin;
+    if (isBox) FDKpushFor(hBs, 5); /* reserved */
+    bsTimeDeltaMin = FDKreadBits(hBs, 11);
+    pGSet->timeDeltaMin = bsTimeDeltaMin + 1;
+  }
+
+  if (pGSet->gainCodingProfile != GCP_CONSTANT) {
+    int i;
+    if (isBox) FDKpushFor(hBs, 3); /* reserved */
+    pGSet->bandCount = FDKreadBits(hBs, 4);
+    if (pGSet->bandCount > 4) return DE_MEMORY_ERROR;
+
+    if ((pGSet->bandCount > 1) || isBox) {
+      pGSet->drcBandType = FDKreadBits(hBs, 1);
+    }
+
+    for (i = 0; i < pGSet->bandCount; i++) {
+      if (version == 0) {
+        *gainSequenceIndex = (*gainSequenceIndex) + 1;
+      } else {
+        int indexPresent;
+        indexPresent = (isBox) ? 1 : FDKreadBits(hBs, 1);
+        if (indexPresent) {
+          int bsIndex;
+          bsIndex = FDKreadBits(hBs, 6);
+          *gainSequenceIndex = bsIndex;
+        } else {
+          *gainSequenceIndex = (*gainSequenceIndex) + 1;
+        }
+      }
+      pGSet->gainSequenceIndex[i] = *gainSequenceIndex;
+      _readDrcCharacteristic(hBs, version, &(pGSet->drcCharacteristic[i]),
+                             isBox);
+    }
+    for (i = 1; i < pGSet->bandCount; i++) {
+      _readBandBorder(hBs, &(pGSet->bandBorder[i]), pGSet->drcBandType, isBox);
+    }
+  } else {
+    pGSet->bandCount = 1;
+    *gainSequenceIndex = (*gainSequenceIndex) + 1;
+    pGSet->gainSequenceIndex[0] = *gainSequenceIndex;
+  }
+
+  return DE_OK;
+}
+
+static DRC_ERROR _readCustomDrcCharacteristic(HANDLE_FDK_BITSTREAM hBs,
+                                              const CHARACTERISTIC_SIDE side,
+                                              UCHAR* pCharacteristicFormat,
+                                              CUSTOM_DRC_CHAR* pCChar,
+                                              int isBox) {
+  if (isBox) FDKpushFor(hBs, 7); /* reserved */
+  *pCharacteristicFormat = FDKreadBits(hBs, 1);
+  if (*pCharacteristicFormat == CF_SIGMOID) {
+    int bsGain, bsIoRatio, bsExp;
+    if (isBox) FDKpushFor(hBs, 1); /* reserved */
+    bsGain = FDKreadBits(hBs, 6);
+    if (side == CS_LEFT) {
+      pCChar->sigmoid.gain = (FIXP_SGL)(bsGain << (FRACT_BITS - 1 - 6));
+    } else {
+      pCChar->sigmoid.gain = (FIXP_SGL)(-bsGain << (FRACT_BITS - 1 - 6));
+    }
+    bsIoRatio = FDKreadBits(hBs, 4);
+    /* pCChar->sigmoid.ioRatio = 0.05 + 0.15 * bsIoRatio; */
+    pCChar->sigmoid.ioRatio =
+        FL2FXCONST_SGL(0.05f / (float)(1 << 2)) +
+        (FIXP_SGL)((((3 * bsIoRatio) << (FRACT_BITS - 1)) / 5) >> 4);
+    bsExp = FDKreadBits(hBs, 4);
+    if (bsExp < 15) {
+      pCChar->sigmoid.exp = (FIXP_SGL)((1 + 2 * bsExp) << (FRACT_BITS - 1 - 5));
+    } else {
+      pCChar->sigmoid.exp = (FIXP_SGL)MAXVAL_SGL; /* represents infinity */
+    }
+    pCChar->sigmoid.flipSign = FDKreadBits(hBs, 1);
+  } else { /* CF_NODES */
+    int i, bsCharacteristicNodeCount, bsNodeLevelDelta, bsNodeGain;
+    if (isBox) FDKpushFor(hBs, 6); /* reserved */
+    bsCharacteristicNodeCount = FDKreadBits(hBs, 2);
+    pCChar->nodes.characteristicNodeCount = bsCharacteristicNodeCount + 1;
+    if (pCChar->nodes.characteristicNodeCount > 4) return DE_MEMORY_ERROR;
+    pCChar->nodes.nodeLevel[0] = DRC_INPUT_LOUDNESS_TARGET_SGL;
+    pCChar->nodes.nodeGain[0] = (FIXP_SGL)0;
+    for (i = 0; i < pCChar->nodes.characteristicNodeCount; i++) {
+      if (isBox) FDKpushFor(hBs, 3); /* reserved */
+      bsNodeLevelDelta = FDKreadBits(hBs, 5);
+      if (side == CS_LEFT) {
+        pCChar->nodes.nodeLevel[i + 1] =
+            pCChar->nodes.nodeLevel[i] -
+            (FIXP_SGL)((1 + bsNodeLevelDelta) << (FRACT_BITS - 1 - 7));
+      } else {
+        pCChar->nodes.nodeLevel[i + 1] =
+            pCChar->nodes.nodeLevel[i] +
+            (FIXP_SGL)((1 + bsNodeLevelDelta) << (FRACT_BITS - 1 - 7));
+      }
+      bsNodeGain = FDKreadBits(hBs, 8);
+      pCChar->nodes.nodeGain[i + 1] = (FIXP_SGL)(
+          (bsNodeGain - 128)
+          << (FRACT_BITS - 1 - 1 - 7)); /* 0.5f * bsNodeGain - 64.0f; */
+    }
+  }
+  return DE_OK;
+}
+
+static void _skipLoudEqInstructions(HANDLE_FDK_BITSTREAM hBs) {
+  int i;
+  int downmixIdPresent, additionalDownmixIdPresent,
+      additionalDownmixIdCount = 0;
+  int drcSetIdPresent, additionalDrcSetIdPresent, additionalDrcSetIdCount = 0;
+  int eqSetIdPresent, additionalEqSetIdPresent, additionalEqSetIdCount = 0;
+  int loudEqGainSequenceCount, drcCharacteristicFormatIsCICP;
+
+  FDKpushFor(hBs, 4); /* loudEqSetId */
+  FDKpushFor(hBs, 4); /* drcLocation */
+  downmixIdPresent = FDKreadBits(hBs, 1);
+  if (downmixIdPresent) {
+    FDKpushFor(hBs, 7); /* downmixId */
+    additionalDownmixIdPresent = FDKreadBits(hBs, 1);
+    if (additionalDownmixIdPresent) {
+      additionalDownmixIdCount = FDKreadBits(hBs, 7);
+      for (i = 0; i < additionalDownmixIdCount; i++) {
+        FDKpushFor(hBs, 7); /* additionalDownmixId */
+      }
+    }
+  }
+
+  drcSetIdPresent = FDKreadBits(hBs, 1);
+  if (drcSetIdPresent) {
+    FDKpushFor(hBs, 6); /* drcSetId */
+    additionalDrcSetIdPresent = FDKreadBits(hBs, 1);
+    if (additionalDrcSetIdPresent) {
+      additionalDrcSetIdCount = FDKreadBits(hBs, 6);
+      for (i = 0; i < additionalDrcSetIdCount; i++) {
+        FDKpushFor(hBs, 6); /* additionalDrcSetId; */
+      }
+    }
+  }
+
+  eqSetIdPresent = FDKreadBits(hBs, 1);
+  if (eqSetIdPresent) {
+    FDKpushFor(hBs, 6); /* eqSetId */
+    additionalEqSetIdPresent = FDKreadBits(hBs, 1);
+    if (additionalEqSetIdPresent) {
+      additionalEqSetIdCount = FDKreadBits(hBs, 6);
+      for (i = 0; i < additionalEqSetIdCount; i++) {
+        FDKpushFor(hBs, 6); /* additionalEqSetId; */
+      }
+    }
+  }
+
+  FDKpushFor(hBs, 1); /* loudnessAfterDrc */
+  FDKpushFor(hBs, 1); /* loudnessAfterEq */
+  loudEqGainSequenceCount = FDKreadBits(hBs, 6);
+  for (i = 0; i < loudEqGainSequenceCount; i++) {
+    FDKpushFor(hBs, 6); /* gainSequenceIndex */
+    drcCharacteristicFormatIsCICP = FDKreadBits(hBs, 1);
+    if (drcCharacteristicFormatIsCICP) {
+      FDKpushFor(hBs, 7); /* drcCharacteristic */
+    } else {
+      FDKpushFor(hBs, 4); /* drcCharacteristicLeftIndex */
+      FDKpushFor(hBs, 4); /* drcCharacteristicRightIndex */
+    }
+    FDKpushFor(hBs, 6); /* frequencyRangeIndex */
+    FDKpushFor(hBs, 3); /* bsLoudEqScaling */
+    FDKpushFor(hBs, 5); /* bsLoudEqOffset */
+  }
+}
+
+static void _skipEqSubbandGainSpline(HANDLE_FDK_BITSTREAM hBs) {
+  int nEqNodes, k, bits;
+  nEqNodes = FDKreadBits(hBs, 5);
+  nEqNodes += 2;
+  for (k = 0; k < nEqNodes; k++) {
+    bits = FDKreadBits(hBs, 1);
+    if (!bits) {
+      FDKpushFor(hBs, 4);
+    }
+  }
+  FDKpushFor(hBs, 4 * (nEqNodes - 1));
+  bits = FDKreadBits(hBs, 2);
+  switch (bits) {
+    case 0:
+      FDKpushFor(hBs, 5);
+      break;
+    case 1:
+    case 2:
+      FDKpushFor(hBs, 4);
+      break;
+    case 3:
+      FDKpushFor(hBs, 3);
+      break;
+  }
+  FDKpushFor(hBs, 5 * (nEqNodes - 1));
+}
+
+static void _skipEqCoefficients(HANDLE_FDK_BITSTREAM hBs) {
+  int j, k;
+  int eqDelayMaxPresent;
+  int uniqueFilterBlockCount, filterElementCount, filterElementGainPresent;
+  int uniqueTdFilterElementCount, eqFilterFormat, bsRealZeroRadiusOneCount,
+      realZeroCount, genericZeroCount, realPoleCount, complexPoleCount,
+      firFilterOrder;
+  int uniqueEqSubbandGainsCount, eqSubbandGainRepresentation,
+      eqSubbandGainCount;
+  EQ_SUBBAND_GAIN_FORMAT eqSubbandGainFormat;
+
+  eqDelayMaxPresent = FDKreadBits(hBs, 1);
+  if (eqDelayMaxPresent) {
+    FDKpushFor(hBs, 8); /* bsEqDelayMax */
+  }
+
+  uniqueFilterBlockCount = FDKreadBits(hBs, 6);
+  for (j = 0; j < uniqueFilterBlockCount; j++) {
+    filterElementCount = FDKreadBits(hBs, 6);
+    for (k = 0; k < filterElementCount; k++) {
+      FDKpushFor(hBs, 6); /* filterElementIndex */
+      filterElementGainPresent = FDKreadBits(hBs, 1);
+      if (filterElementGainPresent) {
+        FDKpushFor(hBs, 10); /* bsFilterElementGain */
+      }
+    }
+  }
+  uniqueTdFilterElementCount = FDKreadBits(hBs, 6);
+  for (j = 0; j < uniqueTdFilterElementCount; j++) {
+    eqFilterFormat = FDKreadBits(hBs, 1);
+    if (eqFilterFormat == 0) { /* pole/zero */
+      bsRealZeroRadiusOneCount = FDKreadBits(hBs, 3);
+      realZeroCount = FDKreadBits(hBs, 6);
+      genericZeroCount = FDKreadBits(hBs, 6);
+      realPoleCount = FDKreadBits(hBs, 4);
+      complexPoleCount = FDKreadBits(hBs, 4);
+      FDKpushFor(hBs, 2 * bsRealZeroRadiusOneCount * 1);
+      FDKpushFor(hBs, realZeroCount * 8);
+      FDKpushFor(hBs, genericZeroCount * 14);
+      FDKpushFor(hBs, realPoleCount * 8);
+      FDKpushFor(hBs, complexPoleCount * 14);
+    } else { /* FIR coefficients */
+      firFilterOrder = FDKreadBits(hBs, 7);
+      FDKpushFor(hBs, 1);
+      FDKpushFor(hBs, (firFilterOrder / 2 + 1) * 11);
+    }
+  }
+  uniqueEqSubbandGainsCount = FDKreadBits(hBs, 6);
+  if (uniqueEqSubbandGainsCount > 0) {
+    eqSubbandGainRepresentation = FDKreadBits(hBs, 1);
+    eqSubbandGainFormat = (EQ_SUBBAND_GAIN_FORMAT)FDKreadBits(hBs, 4);
+    switch (eqSubbandGainFormat) {
+      case GF_QMF32:
+        eqSubbandGainCount = 32;
+        break;
+      case GF_QMFHYBRID39:
+        eqSubbandGainCount = 39;
+        break;
+      case GF_QMF64:
+        eqSubbandGainCount = 64;
+        break;
+      case GF_QMFHYBRID71:
+        eqSubbandGainCount = 71;
+        break;
+      case GF_QMF128:
+        eqSubbandGainCount = 128;
+        break;
+      case GF_QMFHYBRID135:
+        eqSubbandGainCount = 135;
+        break;
+      case GF_UNIFORM:
+      default:
+        eqSubbandGainCount = FDKreadBits(hBs, 8);
+        eqSubbandGainCount++;
+        break;
+    }
+    for (k = 0; k < uniqueEqSubbandGainsCount; k++) {
+      if (eqSubbandGainRepresentation == 1) {
+        _skipEqSubbandGainSpline(hBs);
+      } else {
+        FDKpushFor(hBs, eqSubbandGainCount * 9);
+      }
+    }
+  }
+}
+
+static void _skipTdFilterCascade(HANDLE_FDK_BITSTREAM hBs,
+                                 const int eqChannelGroupCount) {
+  int i, eqCascadeGainPresent, filterBlockCount, eqPhaseAlignmentPresent;
+  for (i = 0; i < eqChannelGroupCount; i++) {
+    eqCascadeGainPresent = FDKreadBits(hBs, 1);
+    if (eqCascadeGainPresent) {
+      FDKpushFor(hBs, 10); /* bsEqCascadeGain */
+    }
+    filterBlockCount = FDKreadBits(hBs, 4);
+    FDKpushFor(hBs, filterBlockCount * 7); /* filterBlockIndex */
+  }
+  eqPhaseAlignmentPresent = FDKreadBits(hBs, 1);
+  {
+    if (eqPhaseAlignmentPresent) {
+      for (i = 0; i < eqChannelGroupCount; i++) {
+        FDKpushFor(hBs, (eqChannelGroupCount - i - 1) * 1);
+      }
+    }
+  }
+}
+
+static DRC_ERROR _skipEqInstructions(HANDLE_FDK_BITSTREAM hBs,
+                                     HANDLE_UNI_DRC_CONFIG hUniDrcConfig) {
+  DRC_ERROR err = DE_OK;
+  int c, i, k, channelCount;
+  int downmixIdPresent, downmixId, eqApplyToDownmix, additionalDownmixIdPresent,
+      additionalDownmixIdCount = 0;
+  int additionalDrcSetIdPresent, additionalDrcSetIdCount;
+  int dependsOnEqSetPresent, eqChannelGroupCount, tdFilterCascadePresent,
+      subbandGainsPresent, eqTransitionDurationPresent;
+
+  FDKpushFor(hBs, 6); /* eqSetId */
+  FDKpushFor(hBs, 4); /* eqSetComplexityLevel */
+  downmixIdPresent = FDKreadBits(hBs, 1);
+  if (downmixIdPresent) {
+    downmixId = FDKreadBits(hBs, 7);
+    eqApplyToDownmix = FDKreadBits(hBs, 1);
+    additionalDownmixIdPresent = FDKreadBits(hBs, 1);
+    if (additionalDownmixIdPresent) {
+      additionalDownmixIdCount = FDKreadBits(hBs, 7);
+      FDKpushFor(hBs, additionalDownmixIdCount * 7); /* additionalDownmixId */
+    }
+  } else {
+    downmixId = 0;
+    eqApplyToDownmix = 0;
+  }
+  FDKpushFor(hBs, 6); /* drcSetId */
+  additionalDrcSetIdPresent = FDKreadBits(hBs, 1);
+  if (additionalDrcSetIdPresent) {
+    additionalDrcSetIdCount = FDKreadBits(hBs, 6);
+    for (i = 0; i < additionalDrcSetIdCount; i++) {
+      FDKpushFor(hBs, 6); /* additionalDrcSetId */
+    }
+  }
+  FDKpushFor(hBs, 16); /* eqSetPurpose */
+  dependsOnEqSetPresent = FDKreadBits(hBs, 1);
+  if (dependsOnEqSetPresent) {
+    FDKpushFor(hBs, 6); /* dependsOnEqSet */
+  } else {
+    FDKpushFor(hBs, 1); /* noIndependentEqUse */
+  }
+
+  channelCount = hUniDrcConfig->channelLayout.baseChannelCount;
+  if ((downmixIdPresent == 1) && (eqApplyToDownmix == 1) && (downmixId != 0) &&
+      (downmixId != DOWNMIX_ID_ANY_DOWNMIX) &&
+      (additionalDownmixIdCount == 0)) {
+    DOWNMIX_INSTRUCTIONS* pDown =
+        selectDownmixInstructions(hUniDrcConfig, downmixId);
+    if (pDown == NULL) return DE_NOT_OK;
+
+    channelCount =
+        pDown->targetChannelCount; /* targetChannelCountFromDownmixId*/
+  } else if ((downmixId == DOWNMIX_ID_ANY_DOWNMIX) ||
+             (additionalDownmixIdCount > 1)) {
+    channelCount = 1;
+  }
+
+  eqChannelGroupCount = 0;
+  for (c = 0; c < channelCount; c++) {
+    UCHAR eqChannelGroupForChannel[8];
+    int newGroup = 1;
+    if (c >= 8) return DE_MEMORY_ERROR;
+    eqChannelGroupForChannel[c] = FDKreadBits(hBs, 7);
+    for (k = 0; k < c; k++) {
+      if (eqChannelGroupForChannel[c] == eqChannelGroupForChannel[k]) {
+        newGroup = 0;
+      }
+    }
+    if (newGroup == 1) {
+      eqChannelGroupCount += 1;
+    }
+  }
+  tdFilterCascadePresent = FDKreadBits(hBs, 1);
+  if (tdFilterCascadePresent) {
+    _skipTdFilterCascade(hBs, eqChannelGroupCount);
+  }
+  subbandGainsPresent = FDKreadBits(hBs, 1);
+  if (subbandGainsPresent) {
+    FDKpushFor(hBs, eqChannelGroupCount * 6); /* subbandGainsIndex */
+  }
+  eqTransitionDurationPresent = FDKreadBits(hBs, 1);
+  if (eqTransitionDurationPresent) {
+    FDKpushFor(hBs, 5); /* bsEqTransitionDuration */
+  }
+  return err;
+}
+
+static void _skipDrcCoefficientsBasic(HANDLE_FDK_BITSTREAM hBs) {
+  FDKpushFor(hBs, 4); /* drcLocation */
+  FDKpushFor(hBs, 7); /* drcCharacteristic */
+}
+
+static DRC_ERROR _readDrcCoefficientsUniDrc(HANDLE_FDK_BITSTREAM hBs,
+                                            const int version,
+                                            DRC_COEFFICIENTS_UNI_DRC* pCoef) {
+  DRC_ERROR err = DE_OK;
+  int i, bsDrcFrameSize;
+  int gainSequenceIndex = -1;
+
+  pCoef->drcLocation = FDKreadBits(hBs, 4);
+  pCoef->drcFrameSizePresent = FDKreadBits(hBs, 1);
+
+  if (pCoef->drcFrameSizePresent == 1) {
+    bsDrcFrameSize = FDKreadBits(hBs, 15);
+    pCoef->drcFrameSize = bsDrcFrameSize + 1;
+  }
+  if (version == 0) {
+    int gainSequenceCount = 0, gainSetCount;
+    pCoef->characteristicLeftCount = 0;
+    pCoef->characteristicRightCount = 0;
+    gainSetCount = FDKreadBits(hBs, 6);
+    pCoef->gainSetCount = fMin(gainSetCount, 12);
+    for (i = 0; i < gainSetCount; i++) {
+      GAIN_SET tmpGset;
+      FDKmemclear(&tmpGset, sizeof(GAIN_SET));
+      err = _readGainSet(hBs, version, &gainSequenceIndex, &tmpGset, 0);
+      if (err) return err;
+      gainSequenceCount += tmpGset.bandCount;
+
+      if (i >= 12) continue;
+      pCoef->gainSet[i] = tmpGset;
+    }
+    pCoef->gainSequenceCount = gainSequenceCount;
+  } else { /* (version == 1) */
+    UCHAR drcCharacteristicLeftPresent, drcCharacteristicRightPresent;
+    UCHAR shapeFiltersPresent, shapeFilterCount, tmpPresent;
+    int gainSetCount;
+    drcCharacteristicLeftPresent = FDKreadBits(hBs, 1);
+    if (drcCharacteristicLeftPresent) {
+      pCoef->characteristicLeftCount = FDKreadBits(hBs, 4);
+      if ((pCoef->characteristicLeftCount + 1) > 8) return DE_MEMORY_ERROR;
+      for (i = 0; i < pCoef->characteristicLeftCount; i++) {
+        err = _readCustomDrcCharacteristic(
+            hBs, CS_LEFT, &(pCoef->characteristicLeftFormat[i + 1]),
+            &(pCoef->customCharacteristicLeft[i + 1]), 0);
+        if (err) return err;
+      }
+    }
+    drcCharacteristicRightPresent = FDKreadBits(hBs, 1);
+    if (drcCharacteristicRightPresent) {
+      pCoef->characteristicRightCount = FDKreadBits(hBs, 4);
+      if ((pCoef->characteristicRightCount + 1) > 8) return DE_MEMORY_ERROR;
+      for (i = 0; i < pCoef->characteristicRightCount; i++) {
+        err = _readCustomDrcCharacteristic(
+            hBs, CS_RIGHT, &(pCoef->characteristicRightFormat[i + 1]),
+            &(pCoef->customCharacteristicRight[i + 1]), 0);
+        if (err) return err;
+      }
+    }
+    shapeFiltersPresent = FDKreadBits(hBs, 1);
+    if (shapeFiltersPresent) {
+      shapeFilterCount = FDKreadBits(hBs, 4);
+      for (i = 0; i < shapeFilterCount; i++) {
+        tmpPresent = FDKreadBits(hBs, 1);
+        if (tmpPresent) /* lfCutParams */
+          FDKpushFor(hBs, 5);
+
+        tmpPresent = FDKreadBits(hBs, 1);
+        if (tmpPresent) /* lfBoostParams */
+          FDKpushFor(hBs, 5);
+
+        tmpPresent = FDKreadBits(hBs, 1);
+        if (tmpPresent) /* hfCutParams */
+          FDKpushFor(hBs, 5);
+
+        tmpPresent = FDKreadBits(hBs, 1);
+        if (tmpPresent) /* hfBoostParams */
+          FDKpushFor(hBs, 5);
+      }
+    }
+    pCoef->gainSequenceCount = FDKreadBits(hBs, 6);
+    gainSetCount = FDKreadBits(hBs, 6);
+    pCoef->gainSetCount = fMin(gainSetCount, 12);
+    for (i = 0; i < gainSetCount; i++) {
+      GAIN_SET tmpGset;
+      FDKmemclear(&tmpGset, sizeof(GAIN_SET));
+      err = _readGainSet(hBs, version, &gainSequenceIndex, &tmpGset, 0);
+      if (err) return err;
+
+      if (i >= 12) continue;
+      pCoef->gainSet[i] = tmpGset;
+    }
+  }
+  for (i = 0; i < 12; i++) {
+    pCoef->gainSetIndexForGainSequence[i] = 255;
+  }
+  for (i = 0; i < pCoef->gainSetCount; i++) {
+    int b;
+    for (b = 0; b < pCoef->gainSet[i].bandCount; b++) {
+      if (pCoef->gainSet[i].gainSequenceIndex[b] >= 12) continue;
+      pCoef->gainSetIndexForGainSequence[pCoef->gainSet[i]
+                                             .gainSequenceIndex[b]] = i;
+    }
+  }
+
+  return err;
+}
+
+static void _skipDrcInstructionsBasic(HANDLE_FDK_BITSTREAM hBs) {
+  int drcSetEffect;
+  int additionalDownmixIdPresent, additionalDownmixIdCount,
+      limiterPeakTargetPresent;
+  int drcSetTargetLoudnessPresent, drcSetTargetLoudnessValueLowerPresent;
+
+  FDKpushFor(hBs, 6); /* drcSetId */
+  FDKpushFor(hBs, 4); /* drcLocation */
+  FDKpushFor(hBs, 7); /* downmixId */
+  additionalDownmixIdPresent = FDKreadBits(hBs, 1);
+  if (additionalDownmixIdPresent) {
+    additionalDownmixIdCount = FDKreadBits(hBs, 3);
+    FDKpushFor(hBs, 7 * additionalDownmixIdCount); /* additionalDownmixId */
+  }
+
+  drcSetEffect = FDKreadBits(hBs, 16);
+  if (!(drcSetEffect & (EB_DUCK_OTHER | EB_DUCK_SELF))) {
+    limiterPeakTargetPresent = FDKreadBits(hBs, 1);
+    if (limiterPeakTargetPresent) {
+      FDKpushFor(hBs, 8); /* bsLimiterPeakTarget */
+    }
+  }
+
+  drcSetTargetLoudnessPresent = FDKreadBits(hBs, 1);
+  if (drcSetTargetLoudnessPresent) {
+    FDKpushFor(hBs, 6); /* bsDrcSetTargetLoudnessValueUpper */
+    drcSetTargetLoudnessValueLowerPresent = FDKreadBits(hBs, 1);
+    if (drcSetTargetLoudnessValueLowerPresent) {
+      FDKpushFor(hBs, 6); /* bsDrcSetTargetLoudnessValueLower */
+    }
+  }
+}
+
+static DRC_ERROR _readDrcInstructionsUniDrc(HANDLE_FDK_BITSTREAM hBs,
+                                            const int version,
+                                            HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+                                            DRC_INSTRUCTIONS_UNI_DRC* pInst) {
+  DRC_ERROR err = DE_OK;
+  int i, g, c;
+  int downmixIdPresent, additionalDownmixIdPresent, additionalDownmixIdCount;
+  int bsLimiterPeakTarget, channelCount;
+  DRC_COEFFICIENTS_UNI_DRC* pCoef = NULL;
+  int repeatParameters, bsRepeatParametersCount;
+  int repeatSequenceIndex, bsRepeatSequenceCount;
+  SCHAR* gainSetIndex = pInst->gainSetIndex;
+  SCHAR channelGroupForChannel[8];
+  DUCKING_MODIFICATION duckingModificationForChannelGroup[8];
+
+  pInst->drcSetId = FDKreadBits(hBs, 6);
+  if (version == 0) {
+    /* Assume all v0 DRC sets to be manageable in terms of complexity */
+    pInst->drcSetComplexityLevel = 2;
+  } else {
+    pInst->drcSetComplexityLevel = FDKreadBits(hBs, 4);
+  }
+  pInst->drcLocation = FDKreadBits(hBs, 4);
+  if (version == 0) {
+    downmixIdPresent = 1;
+  } else {
+    downmixIdPresent = FDKreadBits(hBs, 1);
+  }
+  if (downmixIdPresent) {
+    pInst->downmixId[0] = FDKreadBits(hBs, 7);
+    if (version == 0) {
+      if (pInst->downmixId[0] == 0)
+        pInst->drcApplyToDownmix = 0;
+      else
+        pInst->drcApplyToDownmix = 1;
+    } else {
+      pInst->drcApplyToDownmix = FDKreadBits(hBs, 1);
+    }
+
+    additionalDownmixIdPresent = FDKreadBits(hBs, 1);
+    if (additionalDownmixIdPresent) {
+      additionalDownmixIdCount = FDKreadBits(hBs, 3);
+      if ((1 + additionalDownmixIdCount) > 8) return DE_MEMORY_ERROR;
+      for (i = 0; i < additionalDownmixIdCount; i++) {
+        pInst->downmixId[i + 1] = FDKreadBits(hBs, 7);
+      }
+      pInst->downmixIdCount = 1 + additionalDownmixIdCount;
+    } else {
+      pInst->downmixIdCount = 1;
+    }
+  } else {
+    pInst->downmixId[0] = 0;
+    pInst->downmixIdCount = 1;
+  }
+
+  pInst->drcSetEffect = FDKreadBits(hBs, 16);
+
+  if ((pInst->drcSetEffect & (EB_DUCK_OTHER | EB_DUCK_SELF)) == 0) {
+    pInst->limiterPeakTargetPresent = FDKreadBits(hBs, 1);
+    if (pInst->limiterPeakTargetPresent) {
+      bsLimiterPeakTarget = FDKreadBits(hBs, 8);
+      pInst->limiterPeakTarget = -(FIXP_SGL)(
+          bsLimiterPeakTarget
+          << (FRACT_BITS - 1 - 3 - 5)); /* - bsLimiterPeakTarget * 0.125; */
+    }
+  }
+
+  pInst->drcSetTargetLoudnessPresent = FDKreadBits(hBs, 1);
+
+  /* set default values */
+  pInst->drcSetTargetLoudnessValueUpper = 0;
+  pInst->drcSetTargetLoudnessValueLower = -63;
+
+  if (pInst->drcSetTargetLoudnessPresent == 1) {
+    int bsDrcSetTargetLoudnessValueUpper, bsDrcSetTargetLoudnessValueLower;
+    int drcSetTargetLoudnessValueLowerPresent;
+    bsDrcSetTargetLoudnessValueUpper = FDKreadBits(hBs, 6);
+    pInst->drcSetTargetLoudnessValueUpper =
+        bsDrcSetTargetLoudnessValueUpper - 63;
+    drcSetTargetLoudnessValueLowerPresent = FDKreadBits(hBs, 1);
+    if (drcSetTargetLoudnessValueLowerPresent == 1) {
+      bsDrcSetTargetLoudnessValueLower = FDKreadBits(hBs, 6);
+      pInst->drcSetTargetLoudnessValueLower =
+          bsDrcSetTargetLoudnessValueLower - 63;
+    }
+  }
+
+  pInst->dependsOnDrcSetPresent = FDKreadBits(hBs, 1);
+
+  pInst->noIndependentUse = 0;
+  if (pInst->dependsOnDrcSetPresent) {
+    pInst->dependsOnDrcSet = FDKreadBits(hBs, 6);
+  } else {
+    pInst->noIndependentUse = FDKreadBits(hBs, 1);
+  }
+
+  if (version == 0) {
+    pInst->requiresEq = 0;
+  } else {
+    pInst->requiresEq = FDKreadBits(hBs, 1);
+  }
+
+  pCoef = selectDrcCoefficients(hUniDrcConfig, pInst->drcLocation);
+
+  pInst->drcChannelCount = channelCount =
+      hUniDrcConfig->channelLayout.baseChannelCount;
+
+  if (pInst->drcSetEffect & (EB_DUCK_OTHER | EB_DUCK_SELF)) {
+    DUCKING_MODIFICATION* pDModForChannel =
+        pInst->duckingModificationForChannel;
+    c = 0;
+    while (c < channelCount) {
+      int bsGainSetIndex;
+      bsGainSetIndex = FDKreadBits(hBs, 6);
+      if (c >= 8) return DE_MEMORY_ERROR;
+      gainSetIndex[c] = bsGainSetIndex - 1;
+      _decodeDuckingModification(hBs, &(pDModForChannel[c]), 0);
+
+      c++;
+      repeatParameters = FDKreadBits(hBs, 1);
+      if (repeatParameters == 1) {
+        bsRepeatParametersCount = FDKreadBits(hBs, 5);
+        bsRepeatParametersCount += 1;
+        for (i = 0; i < bsRepeatParametersCount; i++) {
+          if (c >= 8) return DE_MEMORY_ERROR;
+          gainSetIndex[c] = gainSetIndex[c - 1];
+          pDModForChannel[c] = pDModForChannel[c - 1];
+          c++;
+        }
+      }
+    }
+    if (c > channelCount) {
+      return DE_NOT_OK;
+    }
+
+    err = deriveDrcChannelGroups(
+        pInst->drcSetEffect, pInst->drcChannelCount, gainSetIndex,
+        pDModForChannel, &pInst->nDrcChannelGroups,
+        pInst->gainSetIndexForChannelGroup, channelGroupForChannel,
+        duckingModificationForChannelGroup);
+    if (err) return (err);
+  } else {
+    int deriveChannelCount = 0;
+    if (((version == 0) || (pInst->drcApplyToDownmix != 0)) &&
+        (pInst->downmixId[0] != DOWNMIX_ID_BASE_LAYOUT) &&
+        (pInst->downmixId[0] != DOWNMIX_ID_ANY_DOWNMIX) &&
+        (pInst->downmixIdCount == 1)) {
+      if (hUniDrcConfig->downmixInstructionsCount != 0) {
+        DOWNMIX_INSTRUCTIONS* pDown =
+            selectDownmixInstructions(hUniDrcConfig, pInst->downmixId[0]);
+        if (pDown == NULL) return DE_NOT_OK;
+        pInst->drcChannelCount = channelCount =
+            pDown->targetChannelCount; /* targetChannelCountFromDownmixId*/
+      } else {
+        deriveChannelCount = 1;
+        channelCount = 1;
+      }
+    } else if (((version == 0) || (pInst->drcApplyToDownmix != 0)) &&
+               ((pInst->downmixId[0] == DOWNMIX_ID_ANY_DOWNMIX) ||
+                (pInst->downmixIdCount > 1))) {
+      /* Set maximum channel count as upper border. The effective channel count
+       * is set at the process function. */
+      pInst->drcChannelCount = 8;
+      channelCount = 1;
+    }
+
+    c = 0;
+    while (c < channelCount) {
+      int bsGainSetIndex;
+      bsGainSetIndex = FDKreadBits(hBs, 6);
+      if (c >= 8) return DE_MEMORY_ERROR;
+      gainSetIndex[c] = bsGainSetIndex - 1;
+      c++;
+      repeatSequenceIndex = FDKreadBits(hBs, 1);
+
+      if (repeatSequenceIndex == 1) {
+        bsRepeatSequenceCount = FDKreadBits(hBs, 5);
+        bsRepeatSequenceCount += 1;
+        if (deriveChannelCount) {
+          channelCount = 1 + bsRepeatSequenceCount;
+        }
+        for (i = 0; i < bsRepeatSequenceCount; i++) {
+          if (c >= 8) return DE_MEMORY_ERROR;
+          gainSetIndex[c] = bsGainSetIndex - 1;
+          c++;
+        }
+      }
+    }
+    if (c > channelCount) {
+      return DE_NOT_OK;
+    }
+    if (deriveChannelCount) {
+      pInst->drcChannelCount = channelCount;
+    }
+
+    /* DOWNMIX_ID_ANY_DOWNMIX: channelCount is 1. Distribute gainSetIndex to all
+     * channels. */
+    if ((pInst->downmixId[0] == DOWNMIX_ID_ANY_DOWNMIX) ||
+        (pInst->downmixIdCount > 1)) {
+      for (c = 1; c < pInst->drcChannelCount; c++) {
+        gainSetIndex[c] = gainSetIndex[0];
+      }
+    }
+
+    err = deriveDrcChannelGroups(pInst->drcSetEffect, pInst->drcChannelCount,
+                                 gainSetIndex, NULL, &pInst->nDrcChannelGroups,
+                                 pInst->gainSetIndexForChannelGroup,
+                                 channelGroupForChannel, NULL);
+    if (err) return (err);
+
+    for (g = 0; g < pInst->nDrcChannelGroups; g++) {
+      int set, bandCount;
+      set = pInst->gainSetIndexForChannelGroup[g];
+
+      /* get bandCount */
+      if (pCoef != NULL && set < pCoef->gainSetCount) {
+        bandCount = pCoef->gainSet[set].bandCount;
+      } else {
+        bandCount = 1;
+      }
+
+      _decodeGainModification(hBs, version, bandCount,
+                              pInst->gainModificationForChannelGroup[g], 0);
+    }
+  }
+
+  return err;
+}
+
+static DRC_ERROR _readChannelLayout(HANDLE_FDK_BITSTREAM hBs,
+                                    CHANNEL_LAYOUT* pChan) {
+  DRC_ERROR err = DE_OK;
+
+  pChan->baseChannelCount = FDKreadBits(hBs, 7);
+
+  if (pChan->baseChannelCount > 8) return DE_NOT_OK;
+
+  pChan->layoutSignalingPresent = FDKreadBits(hBs, 1);
+
+  if (pChan->layoutSignalingPresent) {
+    pChan->definedLayout = FDKreadBits(hBs, 8);
+
+    if (pChan->definedLayout == 0) {
+      int i;
+      for (i = 0; i < pChan->baseChannelCount; i++) {
+        if (i < 8) {
+          pChan->speakerPosition[i] = FDKreadBits(hBs, 7);
+        } else {
+          FDKpushFor(hBs, 7);
+        }
+      }
+    }
+  }
+  return err;
+}
+
+static DRC_ERROR _readDownmixInstructions(HANDLE_FDK_BITSTREAM hBs,
+                                          const int version,
+                                          CHANNEL_LAYOUT* pChan,
+                                          DOWNMIX_INSTRUCTIONS* pDown) {
+  DRC_ERROR err = DE_OK;
+
+  pDown->downmixId = FDKreadBits(hBs, 7);
+  pDown->targetChannelCount = FDKreadBits(hBs, 7);
+  pDown->targetLayout = FDKreadBits(hBs, 8);
+  pDown->downmixCoefficientsPresent = FDKreadBits(hBs, 1);
+
+  if (pDown->downmixCoefficientsPresent) {
+    int nDownmixCoeffs = pDown->targetChannelCount * pChan->baseChannelCount;
+    int i;
+    if (nDownmixCoeffs > 8 * 8) return DE_NOT_OK;
+    if (version == 0) {
+      pDown->bsDownmixOffset = 0;
+      for (i = 0; i < nDownmixCoeffs; i++) {
+        /* LFE downmix coefficients are not supported. */
+        pDown->downmixCoefficient[i] = downmixCoeff[FDKreadBits(hBs, 4)];
+      }
+    } else {
+      pDown->bsDownmixOffset = FDKreadBits(hBs, 4);
+      for (i = 0; i < nDownmixCoeffs; i++) {
+        pDown->downmixCoefficient[i] = downmixCoeffV1[FDKreadBits(hBs, 5)];
+      }
+    }
+  }
+  return err;
+}
+
+static DRC_ERROR _readDrcExtensionV1(HANDLE_FDK_BITSTREAM hBs,
+                                     HANDLE_UNI_DRC_CONFIG hUniDrcConfig) {
+  DRC_ERROR err = DE_OK;
+  int downmixInstructionsV1Present;
+  int drcCoeffsAndInstructionsUniDrcV1Present;
+  int loudEqInstructionsPresent, loudEqInstructionsCount;
+  int eqPresent, eqInstructionsCount;
+  int i, offset;
+  int diff = hUniDrcConfig->diff;
+
+  downmixInstructionsV1Present = FDKreadBits(hBs, 1);
+  if (downmixInstructionsV1Present == 1) {
+    diff |= _compAssign(&hUniDrcConfig->downmixInstructionsCountV1,
+                        FDKreadBits(hBs, 7));
+    offset = hUniDrcConfig->downmixInstructionsCountV0;
+    hUniDrcConfig->downmixInstructionsCount = fMin(
+        (UCHAR)(offset + hUniDrcConfig->downmixInstructionsCountV1), (UCHAR)6);
+    for (i = 0; i < hUniDrcConfig->downmixInstructionsCountV1; i++) {
+      DOWNMIX_INSTRUCTIONS tmpDown;
+      FDKmemclear(&tmpDown, sizeof(DOWNMIX_INSTRUCTIONS));
+      err = _readDownmixInstructions(hBs, 1, &hUniDrcConfig->channelLayout,
+                                     &tmpDown);
+      if (err) return err;
+      if ((offset + i) >= 6) continue;
+      if (!diff)
+        diff |= (FDKmemcmp(&tmpDown,
+                           &(hUniDrcConfig->downmixInstructions[offset + i]),
+                           sizeof(DOWNMIX_INSTRUCTIONS)) != 0);
+      hUniDrcConfig->downmixInstructions[offset + i] = tmpDown;
+    }
+  } else {
+    diff |= _compAssign(&hUniDrcConfig->downmixInstructionsCountV1, 0);
+  }
+
+  drcCoeffsAndInstructionsUniDrcV1Present = FDKreadBits(hBs, 1);
+  if (drcCoeffsAndInstructionsUniDrcV1Present == 1) {
+    diff |= _compAssign(&hUniDrcConfig->drcCoefficientsUniDrcCountV1,
+                        FDKreadBits(hBs, 3));
+    offset = hUniDrcConfig->drcCoefficientsUniDrcCountV0;
+    hUniDrcConfig->drcCoefficientsUniDrcCount =
+        fMin((UCHAR)(offset + hUniDrcConfig->drcCoefficientsUniDrcCountV1),
+             (UCHAR)2);
+    for (i = 0; i < hUniDrcConfig->drcCoefficientsUniDrcCountV1; i++) {
+      DRC_COEFFICIENTS_UNI_DRC tmpCoef;
+      FDKmemclear(&tmpCoef, sizeof(DRC_COEFFICIENTS_UNI_DRC));
+      err = _readDrcCoefficientsUniDrc(hBs, 1, &tmpCoef);
+      if (err) return err;
+      if ((offset + i) >= 2) continue;
+      if (!diff)
+        diff |= (FDKmemcmp(&tmpCoef,
+                           &(hUniDrcConfig->drcCoefficientsUniDrc[offset + i]),
+                           sizeof(DRC_COEFFICIENTS_UNI_DRC)) != 0);
+      hUniDrcConfig->drcCoefficientsUniDrc[offset + i] = tmpCoef;
+    }
+
+    diff |= _compAssign(&hUniDrcConfig->drcInstructionsUniDrcCountV1,
+                        FDKreadBits(hBs, 6));
+    offset = hUniDrcConfig->drcInstructionsUniDrcCount;
+    hUniDrcConfig->drcInstructionsUniDrcCount =
+        fMin((UCHAR)(offset + hUniDrcConfig->drcInstructionsUniDrcCountV1),
+             (UCHAR)12);
+    for (i = 0; i < hUniDrcConfig->drcInstructionsUniDrcCount; i++) {
+      DRC_INSTRUCTIONS_UNI_DRC tmpInst;
+      FDKmemclear(&tmpInst, sizeof(DRC_INSTRUCTIONS_UNI_DRC));
+      err = _readDrcInstructionsUniDrc(hBs, 1, hUniDrcConfig, &tmpInst);
+      if (err) return err;
+      if ((offset + i) >= 12) continue;
+      if (!diff)
+        diff |= (FDKmemcmp(&tmpInst,
+                           &(hUniDrcConfig->drcInstructionsUniDrc[offset + i]),
+                           sizeof(DRC_INSTRUCTIONS_UNI_DRC)) != 0);
+      hUniDrcConfig->drcInstructionsUniDrc[offset + i] = tmpInst;
+    }
+  } else {
+    diff |= _compAssign(&hUniDrcConfig->drcCoefficientsUniDrcCountV1, 0);
+    diff |= _compAssign(&hUniDrcConfig->drcInstructionsUniDrcCountV1, 0);
+  }
+
+  loudEqInstructionsPresent = FDKreadBits(hBs, 1);
+  if (loudEqInstructionsPresent == 1) {
+    loudEqInstructionsCount = FDKreadBits(hBs, 4);
+    for (i = 0; i < loudEqInstructionsCount; i++) {
+      _skipLoudEqInstructions(hBs);
+    }
+  }
+
+  eqPresent = FDKreadBits(hBs, 1);
+  if (eqPresent == 1) {
+    _skipEqCoefficients(hBs);
+    eqInstructionsCount = FDKreadBits(hBs, 4);
+    for (i = 0; i < eqInstructionsCount; i++) {
+      _skipEqInstructions(hBs, hUniDrcConfig);
+    }
+  }
+
+  hUniDrcConfig->diff = diff;
+
+  return err;
+}
+
+static DRC_ERROR _readUniDrcConfigExtension(
+    HANDLE_FDK_BITSTREAM hBs, HANDLE_UNI_DRC_CONFIG hUniDrcConfig) {
+  DRC_ERROR err = DE_OK;
+  int k, bitSizeLen, extSizeBits, bitSize;
+  UINT nBitsRemaining;
+  UNI_DRC_CONFIG_EXTENSION* pExt = &(hUniDrcConfig->uniDrcConfigExt);
+
+  k = 0;
+  pExt->uniDrcConfigExtType[k] = FDKreadBits(hBs, 4);
+  while (pExt->uniDrcConfigExtType[k] != UNIDRCCONFEXT_TERM) {
+    if (k >= (8 - 1)) return DE_MEMORY_ERROR;
+    bitSizeLen = FDKreadBits(hBs, 4);
+    extSizeBits = bitSizeLen + 4;
+
+    bitSize = FDKreadBits(hBs, extSizeBits);
+    pExt->extBitSize[k] = bitSize + 1;
+    nBitsRemaining = FDKgetValidBits(hBs);
+
+    switch (pExt->uniDrcConfigExtType[k]) {
+      case UNIDRCCONFEXT_V1:
+        err = _readDrcExtensionV1(hBs, hUniDrcConfig);
+        if (err) return err;
+        if (nBitsRemaining != (pExt->extBitSize[k] + FDKgetValidBits(hBs)))
+          return DE_NOT_OK;
+        break;
+      case UNIDRCCONFEXT_PARAM_DRC:
+      /* add future extensions here */
+      default:
+        FDKpushFor(hBs, pExt->extBitSize[k]);
+        break;
+    }
+    k++;
+    pExt->uniDrcConfigExtType[k] = FDKreadBits(hBs, 4);
+  }
+
+  return err;
+}
+
+DRC_ERROR
+drcDec_readUniDrcConfig(HANDLE_FDK_BITSTREAM hBs,
+                        HANDLE_UNI_DRC_CONFIG hUniDrcConfig) {
+  DRC_ERROR err = DE_OK;
+  int i, diff = 0;
+  int drcDescriptionBasicPresent, drcCoefficientsBasicCount,
+      drcInstructionsBasicCount;
+  CHANNEL_LAYOUT tmpChan;
+  FDKmemclear(&tmpChan, sizeof(CHANNEL_LAYOUT));
+  if (hUniDrcConfig == NULL) return DE_NOT_OK;
+
+  diff |= _compAssign(&hUniDrcConfig->sampleRatePresent, FDKreadBits(hBs, 1));
+
+  if (hUniDrcConfig->sampleRatePresent == 1) {
+    diff |=
+        _compAssign(&hUniDrcConfig->sampleRate, FDKreadBits(hBs, 18) + 1000);
+  }
+
+  diff |= _compAssign(&hUniDrcConfig->downmixInstructionsCountV0,
+                      FDKreadBits(hBs, 7));
+
+  drcDescriptionBasicPresent = FDKreadBits(hBs, 1);
+  if (drcDescriptionBasicPresent == 1) {
+    drcCoefficientsBasicCount = FDKreadBits(hBs, 3);
+    drcInstructionsBasicCount = FDKreadBits(hBs, 4);
+  } else {
+    drcCoefficientsBasicCount = 0;
+    drcInstructionsBasicCount = 0;
+  }
+
+  diff |= _compAssign(&hUniDrcConfig->drcCoefficientsUniDrcCountV0,
+                      FDKreadBits(hBs, 3));
+  diff |= _compAssign(&hUniDrcConfig->drcInstructionsUniDrcCountV0,
+                      FDKreadBits(hBs, 6));
+
+  err = _readChannelLayout(hBs, &tmpChan);
+  if (err) return err;
+
+  if (!diff)
+    diff |= (FDKmemcmp(&tmpChan, &hUniDrcConfig->channelLayout,
+                       sizeof(CHANNEL_LAYOUT)) != 0);
+  hUniDrcConfig->channelLayout = tmpChan;
+
+  hUniDrcConfig->downmixInstructionsCount =
+      fMin(hUniDrcConfig->downmixInstructionsCountV0, (UCHAR)6);
+  for (i = 0; i < hUniDrcConfig->downmixInstructionsCountV0; i++) {
+    DOWNMIX_INSTRUCTIONS tmpDown;
+    FDKmemclear(&tmpDown, sizeof(DOWNMIX_INSTRUCTIONS));
+    err = _readDownmixInstructions(hBs, 0, &hUniDrcConfig->channelLayout,
+                                   &tmpDown);
+    if (err) return err;
+    if (i >= 6) continue;
+    if (!diff)
+      diff |= (FDKmemcmp(&tmpDown, &(hUniDrcConfig->downmixInstructions[i]),
+                         sizeof(DOWNMIX_INSTRUCTIONS)) != 0);
+    hUniDrcConfig->downmixInstructions[i] = tmpDown;
+  }
+
+  for (i = 0; i < drcCoefficientsBasicCount; i++) {
+    _skipDrcCoefficientsBasic(hBs);
+  }
+  for (i = 0; i < drcInstructionsBasicCount; i++) {
+    _skipDrcInstructionsBasic(hBs);
+  }
+
+  hUniDrcConfig->drcCoefficientsUniDrcCount =
+      fMin(hUniDrcConfig->drcCoefficientsUniDrcCountV0, (UCHAR)2);
+  for (i = 0; i < hUniDrcConfig->drcCoefficientsUniDrcCountV0; i++) {
+    DRC_COEFFICIENTS_UNI_DRC tmpCoef;
+    FDKmemclear(&tmpCoef, sizeof(DRC_COEFFICIENTS_UNI_DRC));
+    err = _readDrcCoefficientsUniDrc(hBs, 0, &tmpCoef);
+    if (err) return err;
+    if (i >= 2) continue;
+    if (!diff)
+      diff |= (FDKmemcmp(&tmpCoef, &(hUniDrcConfig->drcCoefficientsUniDrc[i]),
+                         sizeof(DRC_COEFFICIENTS_UNI_DRC)) != 0);
+    hUniDrcConfig->drcCoefficientsUniDrc[i] = tmpCoef;
+  }
+
+  hUniDrcConfig->drcInstructionsUniDrcCount =
+      fMin(hUniDrcConfig->drcInstructionsUniDrcCountV0, (UCHAR)12);
+  for (i = 0; i < hUniDrcConfig->drcInstructionsUniDrcCountV0; i++) {
+    DRC_INSTRUCTIONS_UNI_DRC tmpInst;
+    FDKmemclear(&tmpInst, sizeof(DRC_INSTRUCTIONS_UNI_DRC));
+    err = _readDrcInstructionsUniDrc(hBs, 0, hUniDrcConfig, &tmpInst);
+    if (err) return err;
+    if (i >= 12) continue;
+    if (!diff)
+      diff |= (FDKmemcmp(&tmpInst, &(hUniDrcConfig->drcInstructionsUniDrc[i]),
+                         sizeof(DRC_INSTRUCTIONS_UNI_DRC)) != 0);
+    hUniDrcConfig->drcInstructionsUniDrc[i] = tmpInst;
+  }
+
+  diff |=
+      _compAssign(&hUniDrcConfig->uniDrcConfigExtPresent, FDKreadBits(hBs, 1));
+  hUniDrcConfig->diff = diff;
+
+  if (hUniDrcConfig->uniDrcConfigExtPresent == 1) {
+    err = _readUniDrcConfigExtension(hBs, hUniDrcConfig);
+    if (err) return err;
+  }
+
+  return err;
+}
+
+/*******************/
+/* loudnessInfoSet */
+/*******************/
+
+static DRC_ERROR _decodeMethodValue(HANDLE_FDK_BITSTREAM hBs,
+                                    const UCHAR methodDefinition,
+                                    FIXP_DBL* methodValue, INT isBox) {
+  int tmp;
+  FIXP_DBL val;
+  switch (methodDefinition) {
+    case MD_UNKNOWN_OTHER:
+    case MD_PROGRAM_LOUDNESS:
+    case MD_ANCHOR_LOUDNESS:
+    case MD_MAX_OF_LOUDNESS_RANGE:
+    case MD_MOMENTARY_LOUDNESS_MAX:
+    case MD_SHORT_TERM_LOUDNESS_MAX:
+      tmp = FDKreadBits(hBs, 8);
+      val = FL2FXCONST_DBL(-57.75f / (float)(1 << 7)) +
+            (FIXP_DBL)(
+                tmp << (DFRACT_BITS - 1 - 2 - 7)); /* -57.75 + tmp * 0.25; */
+      break;
+    case MD_LOUDNESS_RANGE:
+      tmp = FDKreadBits(hBs, 8);
+      if (tmp == 0)
+        val = (FIXP_DBL)0;
+      else if (tmp <= 128)
+        val = (FIXP_DBL)(tmp << (DFRACT_BITS - 1 - 2 - 7)); /* tmp * 0.25; */
+      else if (tmp <= 204) {
+        val = (FIXP_DBL)(tmp << (DFRACT_BITS - 1 - 1 - 7)) -
+              FL2FXCONST_DBL(32.0f / (float)(1 << 7)); /* 0.5 * tmp - 32.0f; */
+      } else {
+        /* downscale by 1 more bit to prevent overflow at intermediate result */
+        val = (FIXP_DBL)(tmp << (DFRACT_BITS - 1 - 8)) -
+              FL2FXCONST_DBL(134.0f / (float)(1 << 8)); /* tmp - 134.0; */
+        val <<= 1;
+      }
+      break;
+    case MD_MIXING_LEVEL:
+      tmp = FDKreadBits(hBs, isBox ? 8 : 5);
+      val = (FIXP_DBL)(tmp << (DFRACT_BITS - 1 - 7)) +
+            FL2FXCONST_DBL(80.0f / (float)(1 << 7)); /* tmp + 80.0; */
+      break;
+    case MD_ROOM_TYPE:
+      tmp = FDKreadBits(hBs, isBox ? 8 : 2);
+      val = (FIXP_DBL)(tmp << (DFRACT_BITS - 1 - 7)); /* tmp; */
+      break;
+    case MD_SHORT_TERM_LOUDNESS:
+      tmp = FDKreadBits(hBs, 8);
+      val = FL2FXCONST_DBL(-116.0f / (float)(1 << 7)) +
+            (FIXP_DBL)(
+                tmp << (DFRACT_BITS - 1 - 1 - 7)); /* -116.0 + tmp * 0.5; */
+      break;
+    default:
+      return DE_NOT_OK; /* invalid methodDefinition value */
+  }
+  *methodValue = val;
+  return DE_OK;
+}
+
+static DRC_ERROR _readLoudnessMeasurement(HANDLE_FDK_BITSTREAM hBs,
+                                          LOUDNESS_MEASUREMENT* pMeas) {
+  DRC_ERROR err = DE_OK;
+
+  pMeas->methodDefinition = FDKreadBits(hBs, 4);
+  err =
+      _decodeMethodValue(hBs, pMeas->methodDefinition, &pMeas->methodValue, 0);
+  if (err) return err;
+  pMeas->measurementSystem = FDKreadBits(hBs, 4);
+  pMeas->reliability = FDKreadBits(hBs, 2);
+
+  return err;
+}
+
+static DRC_ERROR _readLoudnessInfo(HANDLE_FDK_BITSTREAM hBs, const int version,
+                                   LOUDNESS_INFO* loudnessInfo) {
+  DRC_ERROR err = DE_OK;
+  int bsSamplePeakLevel, bsTruePeakLevel, i;
+  int measurementCount;
+
+  loudnessInfo->drcSetId = FDKreadBits(hBs, 6);
+  if (version >= 1) {
+    loudnessInfo->eqSetId = FDKreadBits(hBs, 6);
+  } else {
+    loudnessInfo->eqSetId = 0;
+  }
+  loudnessInfo->downmixId = FDKreadBits(hBs, 7);
+
+  loudnessInfo->samplePeakLevelPresent = FDKreadBits(hBs, 1);
+  if (loudnessInfo->samplePeakLevelPresent) {
+    bsSamplePeakLevel = FDKreadBits(hBs, 12);
+    if (bsSamplePeakLevel == 0) {
+      loudnessInfo->samplePeakLevelPresent = 0;
+      loudnessInfo->samplePeakLevel = (FIXP_DBL)0;
+    } else { /* 20.0 - bsSamplePeakLevel * 0.03125; */
+      loudnessInfo->samplePeakLevel =
+          FL2FXCONST_DBL(20.0f / (float)(1 << 7)) -
+          (FIXP_DBL)(bsSamplePeakLevel << (DFRACT_BITS - 1 - 5 - 7));
+    }
+  }
+
+  loudnessInfo->truePeakLevelPresent = FDKreadBits(hBs, 1);
+  if (loudnessInfo->truePeakLevelPresent) {
+    bsTruePeakLevel = FDKreadBits(hBs, 12);
+    if (bsTruePeakLevel == 0) {
+      loudnessInfo->truePeakLevelPresent = 0;
+      loudnessInfo->truePeakLevel = (FIXP_DBL)0;
+    } else {
+      loudnessInfo->truePeakLevel =
+          FL2FXCONST_DBL(20.0f / (float)(1 << 7)) -
+          (FIXP_DBL)(bsTruePeakLevel << (DFRACT_BITS - 1 - 5 - 7));
+    }
+    loudnessInfo->truePeakLevelMeasurementSystem = FDKreadBits(hBs, 4);
+    loudnessInfo->truePeakLevelReliability = FDKreadBits(hBs, 2);
+  }
+
+  measurementCount = FDKreadBits(hBs, 4);
+  loudnessInfo->measurementCount = fMin(measurementCount, 8);
+  for (i = 0; i < measurementCount; i++) {
+    LOUDNESS_MEASUREMENT tmpMeas;
+    FDKmemclear(&tmpMeas, sizeof(LOUDNESS_MEASUREMENT));
+    err = _readLoudnessMeasurement(hBs, &tmpMeas);
+    if (err) return err;
+    if (i >= 8) continue;
+    loudnessInfo->loudnessMeasurement[i] = tmpMeas;
+  }
+
+  return err;
+}
+
+static DRC_ERROR _readLoudnessInfoSetExtEq(
+    HANDLE_FDK_BITSTREAM hBs, HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet) {
+  DRC_ERROR err = DE_OK;
+  int i, offset;
+  int diff = hLoudnessInfoSet->diff;
+
+  diff |= _compAssign(&hLoudnessInfoSet->loudnessInfoAlbumCountV1,
+                      FDKreadBits(hBs, 6));
+  diff |=
+      _compAssign(&hLoudnessInfoSet->loudnessInfoCountV1, FDKreadBits(hBs, 6));
+
+  offset = hLoudnessInfoSet->loudnessInfoAlbumCountV0;
+  hLoudnessInfoSet->loudnessInfoAlbumCount = fMin(
+      (UCHAR)(offset + hLoudnessInfoSet->loudnessInfoAlbumCountV1), (UCHAR)12);
+  for (i = 0; i < hLoudnessInfoSet->loudnessInfoAlbumCountV1; i++) {
+    LOUDNESS_INFO tmpLoud;
+    FDKmemclear(&tmpLoud, sizeof(LOUDNESS_INFO));
+    err = _readLoudnessInfo(hBs, 1, &tmpLoud);
+    if (err) return err;
+    if ((offset + i) >= 12) continue;
+    if (!diff)
+      diff |= (FDKmemcmp(&tmpLoud,
+                         &(hLoudnessInfoSet->loudnessInfoAlbum[offset + i]),
+                         sizeof(LOUDNESS_INFO)) != 0);
+    hLoudnessInfoSet->loudnessInfoAlbum[offset + i] = tmpLoud;
+  }
+
+  offset = hLoudnessInfoSet->loudnessInfoCountV0;
+  hLoudnessInfoSet->loudnessInfoCount =
+      fMin((UCHAR)(offset + hLoudnessInfoSet->loudnessInfoCountV1), (UCHAR)12);
+  for (i = 0; i < hLoudnessInfoSet->loudnessInfoCountV1; i++) {
+    LOUDNESS_INFO tmpLoud;
+    FDKmemclear(&tmpLoud, sizeof(LOUDNESS_INFO));
+    err = _readLoudnessInfo(hBs, 1, &tmpLoud);
+    if (err) return err;
+    if ((offset + i) >= 12) continue;
+    if (!diff)
+      diff |=
+          (FDKmemcmp(&tmpLoud, &(hLoudnessInfoSet->loudnessInfo[offset + i]),
+                     sizeof(LOUDNESS_INFO)) != 0);
+    hLoudnessInfoSet->loudnessInfo[offset + i] = tmpLoud;
+  }
+  hLoudnessInfoSet->diff = diff;
+  return err;
+}
+
+static DRC_ERROR _readLoudnessInfoSetExtension(
+    HANDLE_FDK_BITSTREAM hBs, HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet) {
+  DRC_ERROR err = DE_OK;
+  int k, bitSizeLen, extSizeBits, bitSize;
+  UINT nBitsRemaining;
+  LOUDNESS_INFO_SET_EXTENSION* pExt = &(hLoudnessInfoSet->loudnessInfoSetExt);
+
+  k = 0;
+  pExt->loudnessInfoSetExtType[k] = FDKreadBits(hBs, 4);
+  while (pExt->loudnessInfoSetExtType[k] != UNIDRCLOUDEXT_TERM) {
+    if (k >= (8 - 1)) return DE_MEMORY_ERROR;
+    bitSizeLen = FDKreadBits(hBs, 4);
+    extSizeBits = bitSizeLen + 4;
+
+    bitSize = FDKreadBits(hBs, extSizeBits);
+    pExt->extBitSize[k] = bitSize + 1;
+    nBitsRemaining = FDKgetValidBits(hBs);
+
+    switch (pExt->loudnessInfoSetExtType[k]) {
+      case UNIDRCLOUDEXT_EQ:
+        err = _readLoudnessInfoSetExtEq(hBs, hLoudnessInfoSet);
+        if (err) return err;
+        if (nBitsRemaining != (pExt->extBitSize[k] + FDKgetValidBits(hBs)))
+          return DE_NOT_OK;
+        break;
+      /* add future extensions here */
+      default:
+        FDKpushFor(hBs, pExt->extBitSize[k]);
+        break;
+    }
+    k++;
+    pExt->loudnessInfoSetExtType[k] = FDKreadBits(hBs, 4);
+  }
+
+  return err;
+}
+
+/* Parser for loundessInfoSet() */
+DRC_ERROR
+drcDec_readLoudnessInfoSet(HANDLE_FDK_BITSTREAM hBs,
+                           HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet) {
+  DRC_ERROR err = DE_OK;
+  int i, diff = 0;
+  if (hLoudnessInfoSet == NULL) return DE_NOT_OK;
+
+  diff |= _compAssign(&hLoudnessInfoSet->loudnessInfoAlbumCountV0,
+                      FDKreadBits(hBs, 6));
+  diff |=
+      _compAssign(&hLoudnessInfoSet->loudnessInfoCountV0, FDKreadBits(hBs, 6));
+
+  hLoudnessInfoSet->loudnessInfoAlbumCount =
+      fMin(hLoudnessInfoSet->loudnessInfoAlbumCountV0, (UCHAR)12);
+  for (i = 0; i < hLoudnessInfoSet->loudnessInfoAlbumCountV0; i++) {
+    LOUDNESS_INFO tmpLoud;
+    FDKmemclear(&tmpLoud, sizeof(LOUDNESS_INFO));
+    err = _readLoudnessInfo(hBs, 0, &tmpLoud);
+    if (err) return err;
+    if (i >= 12) continue;
+    if (!diff)
+      diff |= (FDKmemcmp(&tmpLoud, &(hLoudnessInfoSet->loudnessInfoAlbum[i]),
+                         sizeof(LOUDNESS_INFO)) != 0);
+    hLoudnessInfoSet->loudnessInfoAlbum[i] = tmpLoud;
+  }
+
+  hLoudnessInfoSet->loudnessInfoCount =
+      fMin(hLoudnessInfoSet->loudnessInfoCountV0, (UCHAR)12);
+  for (i = 0; i < hLoudnessInfoSet->loudnessInfoCountV0; i++) {
+    LOUDNESS_INFO tmpLoud;
+    FDKmemclear(&tmpLoud, sizeof(LOUDNESS_INFO));
+    err = _readLoudnessInfo(hBs, 0, &tmpLoud);
+    if (err) return err;
+    if (i >= 12) continue;
+    if (!diff)
+      diff |= (FDKmemcmp(&tmpLoud, &(hLoudnessInfoSet->loudnessInfo[i]),
+                         sizeof(LOUDNESS_INFO)) != 0);
+    hLoudnessInfoSet->loudnessInfo[i] = tmpLoud;
+  }
+
+  diff |= _compAssign(&hLoudnessInfoSet->loudnessInfoSetExtPresent,
+                      FDKreadBits(hBs, 1));
+  hLoudnessInfoSet->diff = diff;
+
+  if (hLoudnessInfoSet->loudnessInfoSetExtPresent) {
+    err = _readLoudnessInfoSetExtension(hBs, hLoudnessInfoSet);
+    if (err) return err;
+  }
+
+  return err;
+}
diff --git a/libDRCdec/src/drcDec_reader.h b/libDRCdec/src/drcDec_reader.h
new file mode 100644
index 0000000..1ab9b58
--- /dev/null
+++ b/libDRCdec/src/drcDec_reader.h
@@ -0,0 +1,130 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+#ifndef DRCDEC_READER_H
+#define DRCDEC_READER_H
+
+#include "drcDecoder.h"
+#include "drcDec_types.h"
+#include "FDK_bitstream.h"
+
+DRC_ERROR
+drcDec_readUniDrc(HANDLE_FDK_BITSTREAM hBs, HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+                  HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet,
+                  const int frameSize, const int deltaTminDefault,
+                  HANDLE_UNI_DRC_GAIN hUniDrcGain);
+
+DRC_ERROR
+drcDec_readUniDrcGain(HANDLE_FDK_BITSTREAM hBs,
+                      HANDLE_UNI_DRC_CONFIG hUniDrcConfig, const int frameSize,
+                      const int deltaTminDefault,
+                      HANDLE_UNI_DRC_GAIN hUniDrcGain);
+
+DRC_ERROR
+drcDec_readUniDrcConfig(HANDLE_FDK_BITSTREAM hBs,
+                        HANDLE_UNI_DRC_CONFIG hUniDrcConfig);
+
+DRC_ERROR
+drcDec_readLoudnessInfoSet(HANDLE_FDK_BITSTREAM hBs,
+                           HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet);
+
+#endif
diff --git a/libDRCdec/src/drcDec_rom.cpp b/libDRCdec/src/drcDec_rom.cpp
new file mode 100644
index 0000000..9f89689
--- /dev/null
+++ b/libDRCdec/src/drcDec_rom.cpp
@@ -0,0 +1,323 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+#include "drcDec_types.h"
+#include "drcDec_rom.h"
+
+const SCHAR deltaGain_codingProfile_0_1_huffman[24][2] = {
+    {1, 2},    {3, 4},     {-63, -65}, {5, -66},   {-64, 6},   {-80, 7},
+    {8, 9},    {-68, 10},  {11, 12},   {-56, -67}, {-61, 13},  {-62, -69},
+    {14, 15},  {16, -72},  {-71, 17},  {-70, -60}, {18, -59},  {19, 20},
+    {21, -79}, {-57, -73}, {22, -58},  {-76, 23},  {-75, -74}, {-78, -77}};
+
+const SCHAR deltaGain_codingProfile_2_huffman[48][2] = {
+    {1, 2},     {3, 4},     {5, 6},     {7, 8},     {9, 10},    {11, 12},
+    {13, -65},  {14, -64},  {15, -66},  {16, -67},  {17, 18},   {19, -68},
+    {20, -63},  {-69, 21},  {-59, 22},  {-61, -62}, {-60, 23},  {24, -58},
+    {-70, -57}, {-56, -71}, {25, 26},   {27, -55},  {-72, 28},  {-54, 29},
+    {-53, 30},  {-73, -52}, {31, -74},  {32, 33},   {-75, 34},  {-76, 35},
+    {-51, 36},  {-78, 37},  {-77, 38},  {-96, 39},  {-48, 40},  {-50, -79},
+    {41, 42},   {-80, -81}, {-82, 43},  {44, -49},  {45, -84},  {-83, -89},
+    {-86, 46},  {-90, -85}, {-91, -93}, {-92, 47},  {-88, -87}, {-95, -94}};
+
+const FIXP_SGL slopeSteepness[] = {FL2FXCONST_SGL(-3.0518f / (float)(1 << 2)),
+                                   FL2FXCONST_SGL(-1.2207f / (float)(1 << 2)),
+                                   FL2FXCONST_SGL(-0.4883f / (float)(1 << 2)),
+                                   FL2FXCONST_SGL(-0.1953f / (float)(1 << 2)),
+                                   FL2FXCONST_SGL(-0.0781f / (float)(1 << 2)),
+                                   FL2FXCONST_SGL(-0.0312f / (float)(1 << 2)),
+                                   FL2FXCONST_SGL(-0.005f / (float)(1 << 2)),
+                                   FL2FXCONST_SGL(0.0f / (float)(1 << 2)),
+                                   FL2FXCONST_SGL(0.005f / (float)(1 << 2)),
+                                   FL2FXCONST_SGL(0.0312f / (float)(1 << 2)),
+                                   FL2FXCONST_SGL(0.0781f / (float)(1 << 2)),
+                                   FL2FXCONST_SGL(0.1953f / (float)(1 << 2)),
+                                   FL2FXCONST_SGL(0.4883f / (float)(1 << 2)),
+                                   FL2FXCONST_SGL(1.2207f / (float)(1 << 2)),
+                                   FL2FXCONST_SGL(3.0518f / (float)(1 << 2))};
+
+const SCHAR slopeSteepness_huffman[14][2] = {
+    {1, -57},  {-58, 2},   {3, 4},    {5, 6},    {7, -56},
+    {8, -60},  {-61, -55}, {9, -59},  {10, -54}, {-64, 11},
+    {-51, 12}, {-62, -50}, {-63, 13}, {-52, -53}};
+
+const FIXP_DBL downmixCoeff[] = {
+    FL2FXCONST_DBL(1.0000000000 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.9440608763 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.8912509381 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.8413951416 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.7943282347 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.7498942093 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.7079457844 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.6683439176 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.6309573445 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.5956621435 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.5623413252 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.5308844442 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.5011872336 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.4216965034 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.3548133892 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.0000000000 / (float)(1 << 2))};
+
+const FIXP_DBL downmixCoeffV1[] = {
+    FL2FXCONST_DBL(3.1622776602 / (float)(1 << 2)),
+    FL2FXCONST_DBL(1.9952623150 / (float)(1 << 2)),
+    FL2FXCONST_DBL(1.6788040181 / (float)(1 << 2)),
+    FL2FXCONST_DBL(1.4125375446 / (float)(1 << 2)),
+    FL2FXCONST_DBL(1.1885022274 / (float)(1 << 2)),
+    FL2FXCONST_DBL(1.0000000000 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.9440608763 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.8912509381 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.8413951416 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.7943282347 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.7498942093 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.7079457844 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.6683439176 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.6309573445 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.5956621435 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.5623413252 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.5308844442 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.5011872336 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.4731512590 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.4466835922 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.4216965034 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.3981071706 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.3548133892 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.3162277660 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.2818382931 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.2511886432 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.1778279410 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.1000000000 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.0562341325 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.0316227766 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.0100000000 / (float)(1 << 2)),
+    FL2FXCONST_DBL(0.0000000000 / (float)(1 << 2))};
+
+const CUSTOM_DRC_CHAR_SIGMOID cicpDrcCharSigmoidLeft[] = {
+    {FL2FXCONST_SGL(32.0f / (float)(1 << 6)),
+     FL2FXCONST_SGL(0.0f / (float)(1 << 2)),
+     FL2FXCONST_SGL(9.0f / (float)(1 << 5)), 0}, /* 1 */
+    {FL2FXCONST_SGL(32.0f / (float)(1 << 6)),
+     FL2FXCONST_SGL(0.2f / (float)(1 << 2)),
+     FL2FXCONST_SGL(9.0f / (float)(1 << 5)), 0}, /* 2 */
+    {FL2FXCONST_SGL(32.0f / (float)(1 << 6)),
+     FL2FXCONST_SGL(0.4f / (float)(1 << 2)),
+     FL2FXCONST_SGL(9.0f / (float)(1 << 5)), 0}, /* 3 */
+    {FL2FXCONST_SGL(32.0f / (float)(1 << 6)),
+     FL2FXCONST_SGL(0.6f / (float)(1 << 2)),
+     FL2FXCONST_SGL(9.0f / (float)(1 << 5)), 0}, /* 4 */
+    {FL2FXCONST_SGL(32.0f / (float)(1 << 6)),
+     FL2FXCONST_SGL(0.8f / (float)(1 << 2)),
+     FL2FXCONST_SGL(6.0f / (float)(1 << 5)), 0}, /* 5 */
+    {FL2FXCONST_SGL(32.0f / (float)(1 << 6)),
+     FL2FXCONST_SGL(1.0f / (float)(1 << 2)),
+     FL2FXCONST_SGL(5.0f / (float)(1 << 5)), 0}, /* 6 */
+};
+
+const CUSTOM_DRC_CHAR_SIGMOID cicpDrcCharSigmoidRight[] = {
+    {FL2FXCONST_SGL(-32.0f / (float)(1 << 6)),
+     FL2FXCONST_SGL(0.0f / (float)(1 << 2)),
+     FL2FXCONST_SGL(12.0f / (float)(1 << 5)), 0}, /* 1 */
+    {FL2FXCONST_SGL(-32.0f / (float)(1 << 6)),
+     FL2FXCONST_SGL(0.2f / (float)(1 << 2)),
+     FL2FXCONST_SGL(12.0f / (float)(1 << 5)), 0}, /* 2 */
+    {FL2FXCONST_SGL(-32.0f / (float)(1 << 6)),
+     FL2FXCONST_SGL(0.4f / (float)(1 << 2)),
+     FL2FXCONST_SGL(12.0f / (float)(1 << 5)), 0}, /* 3 */
+    {FL2FXCONST_SGL(-32.0f / (float)(1 << 6)),
+     FL2FXCONST_SGL(0.6f / (float)(1 << 2)),
+     FL2FXCONST_SGL(10.0f / (float)(1 << 5)), 0}, /* 4 */
+    {FL2FXCONST_SGL(-32.0f / (float)(1 << 6)),
+     FL2FXCONST_SGL(0.8f / (float)(1 << 2)),
+     FL2FXCONST_SGL(8.0f / (float)(1 << 5)), 0}, /* 5 */
+    {FL2FXCONST_SGL(-32.0f / (float)(1 << 6)),
+     FL2FXCONST_SGL(1.0f / (float)(1 << 2)),
+     FL2FXCONST_SGL(6.0f / (float)(1 << 5)), 0}, /* 6 */
+};
+
+const CUSTOM_DRC_CHAR_NODES cicpDrcCharNodesLeft[] = {
+    {2,
+     {FL2FXCONST_SGL(-31.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-41.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-53.0f / (float)(1 << 7))},
+     {FL2FXCONST_SGL(0.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(0.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(6.0f / (float)(1 << 7))}}, /* 7 */
+    {1,
+     {FL2FXCONST_SGL(-31.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-43.0f / (float)(1 << 7))},
+     {FL2FXCONST_SGL(0.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(6.0f / (float)(1 << 7))}}, /* 8 */
+    {2,
+     {FL2FXCONST_SGL(-31.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-41.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-65.0f / (float)(1 << 7))},
+     {FL2FXCONST_SGL(0.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(0.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(12.0f / (float)(1 << 7))}}, /* 9 */
+    {1,
+     {FL2FXCONST_SGL(-31.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-55.0f / (float)(1 << 7))},
+     {FL2FXCONST_SGL(0.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(12.0f / (float)(1 << 7))}}, /* 10 */
+    {1,
+     {FL2FXCONST_SGL(-31.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-50.0f / (float)(1 << 7))},
+     {FL2FXCONST_SGL(0.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(15.0f / (float)(1 << 7))}} /* 11 */
+};
+
+const CUSTOM_DRC_CHAR_NODES cicpDrcCharNodesRight[] = {
+    {4,
+     {FL2FXCONST_SGL(-31.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-21.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-11.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(9.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(19.0f / (float)(1 << 7))},
+     {FL2FXCONST_SGL(0.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(0.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-5.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-24.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-34.0f / (float)(1 << 7))}}, /* 7 */
+    {4,
+     {FL2FXCONST_SGL(-31.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-26.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-16.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(4.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(14.0f / (float)(1 << 7))},
+     {FL2FXCONST_SGL(0.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(0.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-5.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-24.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-34.0f / (float)(1 << 7))}}, /* 8 */
+    {3,
+     {FL2FXCONST_SGL(-31.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-21.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(9.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(29.0f / (float)(1 << 7))},
+     {FL2FXCONST_SGL(0.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(0.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-15.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-35.0f / (float)(1 << 7))}}, /* 9 */
+    {4,
+     {FL2FXCONST_SGL(-31.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-26.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-16.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(4.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(14.0f / (float)(1 << 7))},
+     {FL2FXCONST_SGL(0.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(0.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-5.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-24.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-34.0f / (float)(1 << 7))}}, /* 10 */
+    {4,
+     {FL2FXCONST_SGL(-31.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-26.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-16.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(4.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(14.0f / (float)(1 << 7))},
+     {FL2FXCONST_SGL(0.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(0.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-5.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-24.0f / (float)(1 << 7)),
+      FL2FXCONST_SGL(-34.0f / (float)(1 << 7))}} /* 11 */
+};
diff --git a/libDRCdec/src/drcDec_rom.h b/libDRCdec/src/drcDec_rom.h
new file mode 100644
index 0000000..daee882
--- /dev/null
+++ b/libDRCdec/src/drcDec_rom.h
@@ -0,0 +1,120 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+#ifndef DRCDEC_ROM_H
+#define DRCDEC_ROM_H
+
+extern const SCHAR deltaGain_codingProfile_0_1_huffman[24][2];
+extern const SCHAR deltaGain_codingProfile_2_huffman[48][2];
+
+extern const FIXP_SGL slopeSteepness[];
+extern const SCHAR slopeSteepness_huffman[14][2];
+
+extern const FIXP_DBL downmixCoeff[];
+extern const FIXP_DBL downmixCoeffV1[];
+
+extern const CUSTOM_DRC_CHAR_SIGMOID cicpDrcCharSigmoidLeft[];
+extern const CUSTOM_DRC_CHAR_SIGMOID cicpDrcCharSigmoidRight[];
+extern const CUSTOM_DRC_CHAR_NODES cicpDrcCharNodesLeft[];
+extern const CUSTOM_DRC_CHAR_NODES cicpDrcCharNodesRight[];
+
+#endif
diff --git a/libDRCdec/src/drcDec_selectionProcess.cpp b/libDRCdec/src/drcDec_selectionProcess.cpp
new file mode 100644
index 0000000..54b731d
--- /dev/null
+++ b/libDRCdec/src/drcDec_selectionProcess.cpp
@@ -0,0 +1,3083 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):   Andreas Hoelzer
+
+   Description: DRC Set Selection
+
+*******************************************************************************/
+
+#include "drcDec_selectionProcess.h"
+#include "drcDec_tools.h"
+
+#define UNDEFINED_LOUDNESS_VALUE (FIXP_DBL) MAXVAL_DBL
+
+typedef enum {
+  DETR_NONE = 0,
+  DETR_NIGHT = 1,
+  DETR_NOISY = 2,
+  DETR_LIMITED = 3,
+  DETR_LOWLEVEL = 4,
+  DETR_DIALOG = 5,
+  DETR_GENERAL_COMPR = 6,
+  DETR_EXPAND = 7,
+  DETR_ARTISTIC = 8,
+  DETR_COUNT
+} DRC_EFFECT_TYPE_REQUEST;
+
+typedef enum {
+  DFRT_EFFECT_TYPE,
+  DFRT_DYNAMIC_RANGE,
+  DFRT_DRC_CHARACTERISTIC
+} DRC_FEATURE_REQUEST_TYPE;
+
+typedef enum {
+  MDR_DEFAULT = 0,
+  MDR_PROGRAM_LOUDNESS = 1,
+  MDR_ANCHOR_LOUDNESS = 2
+} METHOD_DEFINITION_REQUEST;
+
+typedef enum {
+  MSR_DEFAULT = 0,
+  MSR_BS_1770_4 = 1,
+  MSR_USER = 2,
+  MSR_EXPERT_PANEL = 3,
+  MSR_RESERVED_A = 4,
+  MSR_RESERVED_B = 5,
+  MSR_RESERVED_C = 6,
+  MSR_RESERVED_D = 7,
+  MSR_RESERVED_E = 8
+} MEASUREMENT_SYSTEM_REQUEST;
+
+typedef enum {
+  LPR_DEFAULT = 0,
+  LPR_OFF = 1,
+  LPR_HIGHPASS = 2
+} LOUDNESS_PREPROCESSING_REQUEST;
+
+typedef enum {
+  DRMRT_SHORT_TERM_LOUDNESS_TO_AVG = 0,
+  DRMRT_MOMENTARY_LOUDNESS_TO_AVG = 1,
+  DRMRT_TOP_OF_LOUDNESS_RANGE_TO_AVG = 2
+} DYN_RANGE_MEASUREMENT_REQUEST_TYPE;
+
+typedef enum {
+  TCRT_DOWNMIX_ID = 0,
+  TCRT_TARGET_LAYOUT = 1,
+  TCRT_TARGET_CHANNEL_COUNT = 2
+} TARGET_CONFIG_REQUEST_TYPE;
+
+typedef shouldBeUnion {
+  struct {
+    UCHAR numRequests;
+    UCHAR numRequestsDesired;
+    DRC_EFFECT_TYPE_REQUEST request[MAX_REQUESTS_DRC_EFFECT_TYPE];
+  } drcEffectType;
+  struct {
+    DYN_RANGE_MEASUREMENT_REQUEST_TYPE measurementRequestType;
+    UCHAR requestedIsRange;
+    FIXP_DBL requestValue;    /* e = 7 */
+    FIXP_DBL requestValueMin; /* e = 7 */
+    FIXP_DBL requestValueMax; /* e = 7 */
+  } dynamicRange;
+  UCHAR drcCharacteristic;
+}
+DRC_FEATURE_REQUEST;
+
+typedef struct {
+  /* system parameters */
+  SCHAR baseChannelCount;
+  SCHAR baseLayout; /* not supported */
+  TARGET_CONFIG_REQUEST_TYPE targetConfigRequestType;
+  UCHAR numDownmixIdRequests;
+  UCHAR downmixIdRequested[MAX_REQUESTS_DOWNMIX_ID];
+  UCHAR targetLayoutRequested;
+  UCHAR targetChannelCountRequested;
+  LONG audioSampleRate; /* needed for complexity estimation, currently not
+                           supported */
+
+  /* loudness normalization parameters */
+  UCHAR loudnessNormalizationOn;
+  FIXP_DBL targetLoudness; /* e = 7 */
+  UCHAR albumMode;
+  UCHAR peakLimiterPresent;
+  UCHAR loudnessDeviationMax; /* resolution: 1 dB */
+  METHOD_DEFINITION_REQUEST loudnessMeasurementMethod;
+  MEASUREMENT_SYSTEM_REQUEST loudnessMeasurementSystem;
+  LOUDNESS_PREPROCESSING_REQUEST loudnessMeasurementPreProc; /* not supported */
+  LONG deviceCutOffFrequency;                                /* not supported */
+  FIXP_DBL loudnessNormalizationGainDbMax;                   /* e = 7 */
+  FIXP_DBL loudnessNormalizationGainModificationDb;          /* e = 7 */
+  FIXP_DBL outputPeakLevelMax;                               /* e = 7 */
+
+  /* dynamic range control parameters */
+  UCHAR dynamicRangeControlOn;
+  UCHAR numDrcFeatureRequests;
+  DRC_FEATURE_REQUEST_TYPE drcFeatureRequestType[MAX_REQUESTS_DRC_FEATURE];
+  DRC_FEATURE_REQUEST drcFeatureRequest[MAX_REQUESTS_DRC_FEATURE];
+
+  /* other */
+  FIXP_SGL boost;                /* e = 1 */
+  FIXP_SGL compress;             /* e = 1 */
+  UCHAR drcCharacteristicTarget; /* not supported */
+} SEL_PROC_INPUT, *HANDLE_SEL_PROC_INPUT;
+
+/* Table E.1 of ISO/IEC DIS 23003-4: Recommended order of fallback effect type
+ * requests */
+static DRC_EFFECT_TYPE_REQUEST fallbackEffectTypeRequests[6][5] = {
+    /* Night */ {DETR_GENERAL_COMPR, DETR_NOISY, DETR_LIMITED, DETR_LOWLEVEL,
+                 DETR_DIALOG},
+    /* Noisy */
+    {DETR_GENERAL_COMPR, DETR_NIGHT, DETR_LIMITED, DETR_LOWLEVEL, DETR_DIALOG},
+    /* Limited */
+    {DETR_GENERAL_COMPR, DETR_NIGHT, DETR_NOISY, DETR_LOWLEVEL, DETR_DIALOG},
+    /* LowLevel */
+    {DETR_GENERAL_COMPR, DETR_NOISY, DETR_NIGHT, DETR_LIMITED, DETR_DIALOG},
+    /* Dialog */
+    {DETR_GENERAL_COMPR, DETR_NIGHT, DETR_NOISY, DETR_LIMITED, DETR_LOWLEVEL},
+    /* General */
+    {DETR_NIGHT, DETR_NOISY, DETR_LIMITED, DETR_LOWLEVEL, DETR_DIALOG}};
+
+/*******************************************/
+typedef struct {
+  UCHAR selectionFlag;
+  UCHAR downmixIdRequestIndex;
+  FIXP_DBL outputPeakLevel;                     /* e = 7 */
+  FIXP_DBL loudnessNormalizationGainDbAdjusted; /* e = 7 */
+  FIXP_DBL outputLoudness;                      /* e = 7 */
+  DRC_INSTRUCTIONS_UNI_DRC* pInst;
+
+} DRCDEC_SELECTION_DATA;
+
+typedef struct {
+  UCHAR numData;
+  DRCDEC_SELECTION_DATA data[(12 + 1 + 6)];
+
+} DRCDEC_SELECTION;
+
+/*******************************************/
+/* helper functions                        */
+/*******************************************/
+
+static int _isError(int x) {
+  if (x < DRCDEC_SELECTION_PROCESS_WARNING) {
+    return 1;
+  }
+
+  return 0;
+}
+
+/* compare and assign */
+static inline int _compAssign(UCHAR* dest, const UCHAR src) {
+  int diff = 0;
+  if (*dest != src) diff = 1;
+  *dest = src;
+  return diff;
+}
+
+static inline int _compAssign(SCHAR* dest, const SCHAR src) {
+  int diff = 0;
+  if (*dest != src) diff = 1;
+  *dest = src;
+  return diff;
+}
+
+static inline int _compAssign(FIXP_DBL* dest, const FIXP_DBL src) {
+  int diff = 0;
+  if (*dest != src) diff = 1;
+  *dest = src;
+  return diff;
+}
+
+static inline int _compAssign(FIXP_SGL* dest, const FIXP_SGL src) {
+  int diff = 0;
+  if (*dest != src) diff = 1;
+  *dest = src;
+  return diff;
+}
+
+static inline int _compAssign(TARGET_CONFIG_REQUEST_TYPE* dest, const int src) {
+  int diff = 0;
+  if (*dest != src) diff = 1;
+  *dest = (TARGET_CONFIG_REQUEST_TYPE)src;
+  return diff;
+}
+
+static inline int _compAssign(METHOD_DEFINITION_REQUEST* dest, const int src) {
+  int diff = 0;
+  if (*dest != src) diff = 1;
+  *dest = (METHOD_DEFINITION_REQUEST)src;
+  return diff;
+}
+
+static inline int _compAssign(DRC_FEATURE_REQUEST_TYPE* dest, const int src) {
+  int diff = 0;
+  if (*dest != src) diff = 1;
+  *dest = (DRC_FEATURE_REQUEST_TYPE)src;
+  return diff;
+}
+
+static inline int _compAssign(DRC_EFFECT_TYPE_REQUEST* dest, const int src) {
+  int diff = 0;
+  if (*dest != src) diff = 1;
+  *dest = (DRC_EFFECT_TYPE_REQUEST)src;
+  return diff;
+}
+
+static DRCDEC_SELECTION_DATA* _drcdec_selection_addNew(
+    DRCDEC_SELECTION* pSelection);
+
+static DRCDEC_SELECTION_DATA* _drcdec_selection_add(
+    DRCDEC_SELECTION* pSelection, DRCDEC_SELECTION_DATA* pDataIn);
+
+static int _drcdec_selection_clear(DRCDEC_SELECTION* pSelection);
+
+static int _drcdec_selection_getNumber(DRCDEC_SELECTION* pSelection);
+
+static int _drcdec_selection_setNumber(DRCDEC_SELECTION* pSelection, int num);
+
+static DRCDEC_SELECTION_DATA* _drcdec_selection_getAt(
+    DRCDEC_SELECTION* pSelection, int at);
+
+static int _swapSelectionAndClear(DRCDEC_SELECTION** ppCandidatesPotential,
+                                  DRCDEC_SELECTION** ppCandidatesSelected);
+
+static int _swapSelection(DRCDEC_SELECTION** ppCandidatesPotential,
+                          DRCDEC_SELECTION** ppCandidatesSelected);
+
+/*******************************************/
+/* declarations of static functions        */
+/*******************************************/
+
+static DRCDEC_SELECTION_PROCESS_RETURN _initDefaultParams(
+    HANDLE_SEL_PROC_INPUT hSelProcInput);
+
+static DRCDEC_SELECTION_PROCESS_RETURN _initCodecModeParams(
+    HANDLE_SEL_PROC_INPUT hSelProcInput, const SEL_PROC_CODEC_MODE codecMode);
+
+static DRCDEC_SELECTION_PROCESS_RETURN _drcSetPreSelection(
+    SEL_PROC_INPUT* hSelProcInput, HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet,
+    DRCDEC_SELECTION** ppCandidatesPotential,
+    DRCDEC_SELECTION** ppCandidatesSelected, SEL_PROC_CODEC_MODE codecMode);
+
+static DRCDEC_SELECTION_PROCESS_RETURN _drcSetFinalSelection_peakValue0(
+    DRCDEC_SELECTION* pCandidatesPotential,
+    DRCDEC_SELECTION* pCandidatesSelected);
+
+static DRCDEC_SELECTION_PROCESS_RETURN _dynamicRangeMeasurement(
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet, DRC_INSTRUCTIONS_UNI_DRC* pInst,
+    UCHAR downmixIdRequested,
+    DYN_RANGE_MEASUREMENT_REQUEST_TYPE dynamicRangeMeasurementType,
+    int albumMode, int* peakToAveragePresent, FIXP_DBL* peakToAverage);
+
+static DRCDEC_SELECTION_PROCESS_RETURN _channelLayoutToDownmixIdMapping(
+    HANDLE_SEL_PROC_INPUT hSelProcInput, HANDLE_UNI_DRC_CONFIG hUniDrcConfig);
+
+static DRCDEC_SELECTION_PROCESS_RETURN _generateVirtualDrcSets(
+    HANDLE_SEL_PROC_INPUT hSelProcInput, HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+    SEL_PROC_CODEC_MODE codecMode);
+
+static DRCDEC_SELECTION_PROCESS_RETURN _drcSetRequestSelection(
+    SEL_PROC_INPUT* hSelProcInput, HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet,
+    DRCDEC_SELECTION** ppCandidatesPotential,
+    DRCDEC_SELECTION** ppCandidatesSelected);
+
+static DRCDEC_SELECTION_PROCESS_RETURN _drcSetFinalSelection(
+    HANDLE_SEL_PROC_INPUT hSelProcInput, HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+    DRCDEC_SELECTION** ppCandidatesPotential,
+    DRCDEC_SELECTION** ppCandidatesSelected, SEL_PROC_CODEC_MODE codecMode);
+
+static DRCDEC_SELECTION_PROCESS_RETURN _generateOutputInfo(
+    HANDLE_SEL_PROC_INPUT hSelProcInput, HANDLE_SEL_PROC_OUTPUT hSelProcOutput,
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet,
+    DRCDEC_SELECTION_DATA* pSelectionData, SEL_PROC_CODEC_MODE codecMode);
+
+static DRCDEC_SELECTION_PROCESS_RETURN _selectDownmixMatrix(
+    HANDLE_SEL_PROC_OUTPUT hSelProcOutput, HANDLE_UNI_DRC_CONFIG hUniDrcConfig);
+
+static DRCDEC_SELECTION_PROCESS_RETURN _getLoudness(
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet, int albumMode,
+    METHOD_DEFINITION_REQUEST measurementMethodRequested,
+    MEASUREMENT_SYSTEM_REQUEST measurementSystemRequested,
+    FIXP_DBL targetLoudness, int drcSetId, int downmixIdRequested,
+    FIXP_DBL* pLoudnessNormalizationGain, FIXP_DBL* pLoudness);
+
+static DRCDEC_SELECTION_PROCESS_RETURN _getMixingLevel(
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet, int downmixIdRequested,
+    int drcSetIdRequested, int albumMode, FIXP_DBL* pMixingLevel);
+
+static DRCDEC_SELECTION_PROCESS_RETURN _getSignalPeakLevel(
+    HANDLE_SEL_PROC_INPUT hSelProcInput, HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet, DRC_INSTRUCTIONS_UNI_DRC* pInst,
+    int downmixIdRequested, int* explicitPeakInformationPresent,
+    FIXP_DBL* signalPeakLevelOut, /* e = 7 */
+    SEL_PROC_CODEC_MODE codecMode);
+
+static DRCDEC_SELECTION_PROCESS_RETURN _extractLoudnessPeakToAverageValue(
+    LOUDNESS_INFO* loudnessInfo,
+    DYN_RANGE_MEASUREMENT_REQUEST_TYPE dynamicRangeMeasurementType,
+    int* pLoudnessPeakToAverageValuePresent,
+    FIXP_DBL* pLoudnessPeakToAverageValue);
+
+static DRCDEC_SELECTION_PROCESS_RETURN _selectAlbumLoudness(
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet,
+    DRCDEC_SELECTION* pCandidatesPotential,
+    DRCDEC_SELECTION* pCandidatesSelected);
+
+static int _findMethodDefinition(LOUDNESS_INFO* pLoudnessInfo,
+                                 int methodDefinition, int startIndex);
+
+/*******************************************/
+/* public functions                        */
+/*******************************************/
+
+struct s_drcdec_selection_process {
+  SEL_PROC_CODEC_MODE codecMode;
+  SEL_PROC_INPUT selProcInput;
+  DRCDEC_SELECTION
+  selectionData[2]; /* 2 instances, one before and one after selection */
+};
+
+DRCDEC_SELECTION_PROCESS_RETURN
+drcDec_SelectionProcess_Create(HANDLE_DRC_SELECTION_PROCESS* phInstance) {
+  HANDLE_DRC_SELECTION_PROCESS hInstance;
+  hInstance = (HANDLE_DRC_SELECTION_PROCESS)FDKcalloc(
+      1, sizeof(struct s_drcdec_selection_process));
+
+  if (!hInstance) return DRCDEC_SELECTION_PROCESS_OUTOFMEMORY;
+
+  hInstance->codecMode = SEL_PROC_CODEC_MODE_UNDEFINED;
+
+  *phInstance = hInstance;
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+DRCDEC_SELECTION_PROCESS_RETURN
+drcDec_SelectionProcess_Init(HANDLE_DRC_SELECTION_PROCESS hInstance) {
+  if (!hInstance) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+  _initDefaultParams(&hInstance->selProcInput);
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+DRCDEC_SELECTION_PROCESS_RETURN
+drcDec_SelectionProcess_SetCodecMode(HANDLE_DRC_SELECTION_PROCESS hInstance,
+                                     const SEL_PROC_CODEC_MODE codecMode) {
+  DRCDEC_SELECTION_PROCESS_RETURN retVal = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+
+  if (!hInstance) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+  switch (codecMode) {
+    case SEL_PROC_MPEG_4_AAC:
+    case SEL_PROC_MPEG_D_USAC:
+    case SEL_PROC_TEST_TIME_DOMAIN:
+    case SEL_PROC_TEST_QMF_DOMAIN:
+    case SEL_PROC_TEST_STFT_DOMAIN:
+      hInstance->codecMode = codecMode;
+      break;
+
+    case SEL_PROC_CODEC_MODE_UNDEFINED:
+    default:
+      return DRCDEC_SELECTION_PROCESS_NOT_OK;
+  }
+
+  retVal = _initCodecModeParams(&(hInstance->selProcInput),
+                                hInstance->codecMode = codecMode);
+
+  return retVal;
+}
+
+DRCDEC_SELECTION_PROCESS_RETURN
+drcDec_SelectionProcess_SetParam(HANDLE_DRC_SELECTION_PROCESS hInstance,
+                                 const SEL_PROC_USER_PARAM requestType,
+                                 FIXP_DBL requestValue, int* pDiff) {
+  INT requestValueInt = (INT)requestValue;
+  int i, diff = 0;
+  SEL_PROC_INPUT* pSelProcInput = &(hInstance->selProcInput);
+
+  switch (requestType) {
+    case SEL_PROC_LOUDNESS_NORMALIZATION_ON:
+      if ((requestValueInt != 0) && (requestValueInt != 1))
+        return DRCDEC_SELECTION_PROCESS_PARAM_OUT_OF_RANGE;
+      diff |=
+          _compAssign(&pSelProcInput->loudnessNormalizationOn, requestValueInt);
+      break;
+    case SEL_PROC_TARGET_LOUDNESS:
+      /* Lower boundary: drcSetTargetLoudnessValueLower default value.
+         Upper boundary: drcSetTargetLoudnessValueUpper default value */
+      if ((requestValue < FL2FXCONST_DBL(-63.0f / (float)(1 << 7))) ||
+          (requestValue > (FIXP_DBL)0))
+        return DRCDEC_SELECTION_PROCESS_PARAM_OUT_OF_RANGE;
+      if (requestValue >
+          FL2FXCONST_DBL(-10.0f /
+                         (float)(1 << 7))) /* recommended maximum value */
+        requestValue = FL2FXCONST_DBL(-10.0f / (float)(1 << 7));
+      diff |= _compAssign(&pSelProcInput->targetLoudness, requestValue);
+      break;
+    case SEL_PROC_EFFECT_TYPE:
+      if ((requestValueInt < -1) || (requestValueInt >= DETR_COUNT))
+        return DRCDEC_SELECTION_PROCESS_PARAM_OUT_OF_RANGE;
+      /* Caution. This overrides all drcFeatureRequests requested so far! */
+      if (requestValueInt == -1) {
+        diff |= _compAssign(&pSelProcInput->dynamicRangeControlOn, 0);
+      } else if (requestValueInt == DETR_NONE) {
+        diff |= _compAssign(&pSelProcInput->dynamicRangeControlOn, 1);
+        diff |= _compAssign(&pSelProcInput->numDrcFeatureRequests, 0);
+      } else {
+        diff |= _compAssign(&pSelProcInput->dynamicRangeControlOn, 1);
+        diff |= _compAssign(&pSelProcInput->numDrcFeatureRequests, 1);
+        diff |= _compAssign(&pSelProcInput->drcFeatureRequestType[0],
+                            DFRT_EFFECT_TYPE);
+        diff |= _compAssign(&pSelProcInput->drcFeatureRequest[0]
+                                 .drcEffectType.numRequestsDesired,
+                            1);
+        diff |= _compAssign(
+            &pSelProcInput->drcFeatureRequest[0].drcEffectType.request[0],
+            requestValueInt);
+        if ((requestValueInt > DETR_NONE) &&
+            (requestValueInt <= DETR_GENERAL_COMPR)) {
+          /* use fallback effect type requests */
+          for (i = 0; i < 5; i++) {
+            diff |=
+                _compAssign(&pSelProcInput->drcFeatureRequest[0]
+                                 .drcEffectType.request[i + 1],
+                            fallbackEffectTypeRequests[requestValueInt - 1][i]);
+          }
+          diff |= _compAssign(
+              &pSelProcInput->drcFeatureRequest[0].drcEffectType.numRequests,
+              6);
+        } else {
+          diff |= _compAssign(
+              &pSelProcInput->drcFeatureRequest[0].drcEffectType.numRequests,
+              1);
+        }
+      }
+      break;
+    case SEL_PROC_LOUDNESS_MEASUREMENT_METHOD:
+      if ((requestValueInt < 0) || (requestValueInt > 2))
+        return DRCDEC_SELECTION_PROCESS_PARAM_OUT_OF_RANGE;
+      diff |= _compAssign(&pSelProcInput->loudnessMeasurementMethod,
+                          requestValueInt);
+      break;
+    case SEL_PROC_DOWNMIX_ID:
+      diff |=
+          _compAssign(&pSelProcInput->targetConfigRequestType, TCRT_DOWNMIX_ID);
+      if (requestValueInt < 0) { /* negative requests signal no downmixId */
+        diff |= _compAssign(&pSelProcInput->numDownmixIdRequests, 0);
+      } else {
+        diff |= _compAssign(&pSelProcInput->numDownmixIdRequests, 1);
+        diff |=
+            _compAssign(&pSelProcInput->downmixIdRequested[0], requestValueInt);
+      }
+      break;
+    case SEL_PROC_TARGET_LAYOUT:
+      /* Request target layout according to ChannelConfiguration in ISO/IEC
+       * 23001-8 (CICP) */
+      if ((requestValueInt < 1) || (requestValueInt > 63))
+        return DRCDEC_SELECTION_PROCESS_PARAM_OUT_OF_RANGE;
+      diff |= _compAssign(&pSelProcInput->targetConfigRequestType,
+                          TCRT_TARGET_LAYOUT);
+      diff |=
+          _compAssign(&pSelProcInput->targetLayoutRequested, requestValueInt);
+      break;
+    case SEL_PROC_TARGET_CHANNEL_COUNT:
+      if ((requestValueInt < 1) || (requestValueInt > 8))
+        return DRCDEC_SELECTION_PROCESS_PARAM_OUT_OF_RANGE;
+      diff |= _compAssign(&pSelProcInput->targetConfigRequestType,
+                          TCRT_TARGET_CHANNEL_COUNT);
+      diff |= _compAssign(&pSelProcInput->targetChannelCountRequested,
+                          requestValueInt);
+      break;
+    case SEL_PROC_BASE_CHANNEL_COUNT:
+      if (requestValueInt < 0)
+        return DRCDEC_SELECTION_PROCESS_PARAM_OUT_OF_RANGE;
+      diff |= _compAssign(&pSelProcInput->baseChannelCount, requestValueInt);
+      break;
+    case SEL_PROC_SAMPLE_RATE:
+      if (requestValueInt < 0)
+        return DRCDEC_SELECTION_PROCESS_PARAM_OUT_OF_RANGE;
+      diff |= _compAssign(&pSelProcInput->audioSampleRate, requestValueInt);
+      break;
+    case SEL_PROC_BOOST:
+      if ((requestValue < (FIXP_DBL)0) ||
+          (requestValue > FL2FXCONST_DBL(1.0f / (float)(1 << 1))))
+        return DRCDEC_SELECTION_PROCESS_PARAM_OUT_OF_RANGE;
+      diff |= _compAssign(&pSelProcInput->boost, FX_DBL2FX_SGL(requestValue));
+      break;
+    case SEL_PROC_COMPRESS:
+      if ((requestValue < (FIXP_DBL)0) ||
+          (requestValue > FL2FXCONST_DBL(1.0f / (float)(1 << 1))))
+        return DRCDEC_SELECTION_PROCESS_PARAM_OUT_OF_RANGE;
+      diff |=
+          _compAssign(&pSelProcInput->compress, FX_DBL2FX_SGL(requestValue));
+      break;
+    default:
+      return DRCDEC_SELECTION_PROCESS_INVALID_PARAM;
+  }
+
+  if (pDiff != NULL) {
+    *pDiff |= diff;
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+FIXP_DBL
+drcDec_SelectionProcess_GetParam(HANDLE_DRC_SELECTION_PROCESS hInstance,
+                                 const SEL_PROC_USER_PARAM requestType) {
+  SEL_PROC_INPUT* pSelProcInput = &(hInstance->selProcInput);
+
+  switch (requestType) {
+    case SEL_PROC_LOUDNESS_NORMALIZATION_ON:
+      return (FIXP_DBL)pSelProcInput->loudnessNormalizationOn;
+    case SEL_PROC_DYNAMIC_RANGE_CONTROL_ON:
+      return (FIXP_DBL)pSelProcInput->dynamicRangeControlOn;
+    default:
+      return (FIXP_DBL)0;
+  }
+}
+
+DRCDEC_SELECTION_PROCESS_RETURN
+drcDec_SelectionProcess_Delete(HANDLE_DRC_SELECTION_PROCESS* phInstance) {
+  if (phInstance == NULL || *phInstance == NULL)
+    return DRCDEC_SELECTION_PROCESS_INVALID_HANDLE;
+
+  FDKfree(*phInstance);
+  *phInstance = NULL;
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+DRCDEC_SELECTION_PROCESS_RETURN
+drcDec_SelectionProcess_Process(HANDLE_DRC_SELECTION_PROCESS hInstance,
+                                HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+                                HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet,
+                                HANDLE_SEL_PROC_OUTPUT hSelProcOutput) {
+  DRCDEC_SELECTION_PROCESS_RETURN retVal = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+  DRCDEC_SELECTION* pCandidatesSelected;
+  DRCDEC_SELECTION* pCandidatesPotential;
+
+  if (hInstance == NULL) return DRCDEC_SELECTION_PROCESS_INVALID_HANDLE;
+
+  pCandidatesSelected = &(hInstance->selectionData[0]);
+  pCandidatesPotential = &(hInstance->selectionData[1]);
+  _drcdec_selection_setNumber(pCandidatesSelected, 0);
+  _drcdec_selection_setNumber(pCandidatesPotential, 0);
+
+  retVal = _generateVirtualDrcSets(&(hInstance->selProcInput), hUniDrcConfig,
+                                   hInstance->codecMode);
+  if (retVal) return (retVal);
+
+  if (hInstance->selProcInput.baseChannelCount !=
+      hUniDrcConfig->channelLayout.baseChannelCount) {
+    hInstance->selProcInput.baseChannelCount =
+        hUniDrcConfig->channelLayout.baseChannelCount;
+  }
+
+  if ((hInstance->selProcInput.targetConfigRequestType != 0) ||
+      (hInstance->selProcInput.targetConfigRequestType == 0 &&
+       hInstance->selProcInput.numDownmixIdRequests == 0)) {
+    retVal = _channelLayoutToDownmixIdMapping(&(hInstance->selProcInput),
+                                              hUniDrcConfig);
+
+    if (_isError(retVal)) return (retVal);
+  }
+
+  retVal = _drcSetPreSelection(&(hInstance->selProcInput), hUniDrcConfig,
+                               hLoudnessInfoSet, &pCandidatesPotential,
+                               &pCandidatesSelected, hInstance->codecMode);
+  if (retVal) return (retVal);
+
+  if (hInstance->selProcInput.albumMode) {
+    _swapSelectionAndClear(&pCandidatesPotential, &pCandidatesSelected);
+
+    retVal = _selectAlbumLoudness(hLoudnessInfoSet, pCandidatesPotential,
+                                  pCandidatesSelected);
+    if (retVal) return (retVal);
+
+    if (_drcdec_selection_getNumber(pCandidatesSelected) == 0) {
+      _swapSelection(&pCandidatesPotential, &pCandidatesSelected);
+    }
+  }
+
+  _swapSelectionAndClear(&pCandidatesPotential, &pCandidatesSelected);
+
+  retVal = _drcSetRequestSelection(&(hInstance->selProcInput), hUniDrcConfig,
+                                   hLoudnessInfoSet, &pCandidatesPotential,
+                                   &pCandidatesSelected);
+  if (retVal) return (retVal);
+
+  retVal = _drcSetFinalSelection(&(hInstance->selProcInput), hUniDrcConfig,
+                                 &pCandidatesPotential, &pCandidatesSelected,
+                                 hInstance->codecMode);
+  if (retVal) return (retVal);
+
+  retVal = _generateOutputInfo(
+      &(hInstance->selProcInput), hSelProcOutput, hUniDrcConfig,
+      hLoudnessInfoSet, &(pCandidatesSelected->data[0]), hInstance->codecMode);
+
+  if (_isError(retVal)) return (retVal);
+
+  retVal = _selectDownmixMatrix(hSelProcOutput, hUniDrcConfig);
+  if (retVal) return (retVal);
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+/*******************************************/
+/* static functions                        */
+/*******************************************/
+
+static DRCDEC_SELECTION_PROCESS_RETURN _initDefaultParams(
+    HANDLE_SEL_PROC_INPUT hSelProcInput) {
+  DRCDEC_SELECTION_PROCESS_RETURN retVal = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+
+  if (hSelProcInput == NULL) return DRCDEC_SELECTION_PROCESS_INVALID_HANDLE;
+
+  /* system parameters */
+  hSelProcInput->baseChannelCount = -1;
+  hSelProcInput->baseLayout = -1;
+  hSelProcInput->targetConfigRequestType = TCRT_DOWNMIX_ID;
+  hSelProcInput->numDownmixIdRequests = 0;
+
+  /* loudness normalization parameters */
+  hSelProcInput->albumMode = 0;
+  hSelProcInput->peakLimiterPresent = 0;
+  hSelProcInput->loudnessNormalizationOn = 1;
+  hSelProcInput->targetLoudness = FL2FXCONST_DBL(-24.0f / (float)(1 << 7));
+  hSelProcInput->loudnessDeviationMax = DEFAULT_LOUDNESS_DEVIATION_MAX;
+  hSelProcInput->loudnessMeasurementMethod = MDR_DEFAULT;
+  hSelProcInput->loudnessMeasurementSystem = MSR_DEFAULT;
+  hSelProcInput->loudnessMeasurementPreProc = LPR_DEFAULT;
+  hSelProcInput->deviceCutOffFrequency = 500;
+  hSelProcInput->loudnessNormalizationGainDbMax =
+      (FIXP_DBL)MAXVAL_DBL; /* infinity as default */
+  hSelProcInput->loudnessNormalizationGainModificationDb = (FIXP_DBL)0;
+  hSelProcInput->outputPeakLevelMax = (FIXP_DBL)0;
+  if (hSelProcInput->peakLimiterPresent == 1) {
+    hSelProcInput->outputPeakLevelMax = FL2FXCONST_DBL(6.0f / (float)(1 << 7));
+  }
+
+  /* dynamic range control parameters */
+  hSelProcInput->dynamicRangeControlOn = 1;
+
+  hSelProcInput->numDrcFeatureRequests = 0;
+
+  /* other parameters */
+  hSelProcInput->boost = FL2FXCONST_SGL(1.f / (float)(1 << 1));
+  hSelProcInput->compress = FL2FXCONST_SGL(1.f / (float)(1 << 1));
+  hSelProcInput->drcCharacteristicTarget = 0;
+
+  return retVal;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _initCodecModeParams(
+    HANDLE_SEL_PROC_INPUT hSelProcInput, const SEL_PROC_CODEC_MODE codecMode) {
+  DRCDEC_SELECTION_PROCESS_RETURN retVal = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+
+  if (hSelProcInput == NULL) return DRCDEC_SELECTION_PROCESS_INVALID_HANDLE;
+
+  switch (codecMode) {
+    case SEL_PROC_MPEG_H_3DA:
+      hSelProcInput->loudnessDeviationMax = 0;
+      hSelProcInput->peakLimiterPresent = 1; /* peak limiter is mandatory */
+      /* The peak limiter also has to catch overshoots due to user
+      interactivity, downmixing etc. Therefore the maximum output peak level is
+      reduced to 0 dB. */
+      hSelProcInput->outputPeakLevelMax = (FIXP_DBL)0;
+      break;
+    case SEL_PROC_MPEG_4_AAC:
+    case SEL_PROC_MPEG_D_USAC:
+      hSelProcInput->loudnessDeviationMax = DEFAULT_LOUDNESS_DEVIATION_MAX;
+      hSelProcInput->peakLimiterPresent = 1;
+      /* A peak limiter is present at the end of the decoder, therefore we can
+       * allow for a maximum output peak level greater than full scale
+       */
+      hSelProcInput->outputPeakLevelMax =
+          FL2FXCONST_DBL(6.0f / (float)(1 << 7));
+      break;
+    case SEL_PROC_TEST_TIME_DOMAIN:
+    case SEL_PROC_TEST_QMF_DOMAIN:
+    case SEL_PROC_TEST_STFT_DOMAIN:
+      /* for testing, adapt to default settings in reference software */
+      hSelProcInput->loudnessNormalizationOn = 0;
+      hSelProcInput->dynamicRangeControlOn = 0;
+      break;
+    case SEL_PROC_CODEC_MODE_UNDEFINED:
+    default:
+      hSelProcInput->loudnessDeviationMax = DEFAULT_LOUDNESS_DEVIATION_MAX;
+      hSelProcInput->peakLimiterPresent = 0;
+  }
+
+  return retVal;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _channelLayoutToDownmixIdMapping(
+    HANDLE_SEL_PROC_INPUT hSelProcInput, HANDLE_UNI_DRC_CONFIG hUniDrcConfig) {
+  DRCDEC_SELECTION_PROCESS_RETURN retVal = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+
+  DOWNMIX_INSTRUCTIONS* pDown = NULL;
+
+  int i;
+
+  hSelProcInput->numDownmixIdRequests = 0;
+
+  switch (hSelProcInput->targetConfigRequestType) {
+    case TCRT_DOWNMIX_ID:
+      if (hSelProcInput->numDownmixIdRequests == 0) {
+        hSelProcInput->downmixIdRequested[0] = 0;
+        hSelProcInput->numDownmixIdRequests = 1;
+      }
+
+      break;
+
+    case TCRT_TARGET_LAYOUT:
+      if (hSelProcInput->targetLayoutRequested == hSelProcInput->baseLayout) {
+        hSelProcInput->downmixIdRequested[0] = 0;
+        hSelProcInput->numDownmixIdRequests = 1;
+      }
+
+      if (hSelProcInput->numDownmixIdRequests == 0) {
+        for (i = 0; i < hUniDrcConfig->downmixInstructionsCount; i++) {
+          pDown = &(hUniDrcConfig->downmixInstructions[i]);
+
+          if (hSelProcInput->targetLayoutRequested == pDown->targetLayout) {
+            hSelProcInput
+                ->downmixIdRequested[hSelProcInput->numDownmixIdRequests] =
+                pDown->downmixId;
+            hSelProcInput->numDownmixIdRequests++;
+          }
+        }
+      }
+
+      if (hSelProcInput->baseLayout == -1) {
+        retVal = DRCDEC_SELECTION_PROCESS_WARNING;
+      }
+
+      if (hSelProcInput->numDownmixIdRequests == 0) {
+        hSelProcInput->downmixIdRequested[0] = 0;
+        hSelProcInput->numDownmixIdRequests = 1;
+        retVal = DRCDEC_SELECTION_PROCESS_WARNING;
+      }
+
+      break;
+
+    case TCRT_TARGET_CHANNEL_COUNT:
+      if (hSelProcInput->targetChannelCountRequested ==
+          hSelProcInput->baseChannelCount) {
+        hSelProcInput->downmixIdRequested[0] = 0;
+        hSelProcInput->numDownmixIdRequests = 1;
+      }
+
+      if (hSelProcInput->numDownmixIdRequests == 0) {
+        for (i = 0; i < hUniDrcConfig->downmixInstructionsCount; i++) {
+          pDown = &(hUniDrcConfig->downmixInstructions[i]);
+
+          if (hSelProcInput->targetChannelCountRequested ==
+              pDown->targetChannelCount) {
+            hSelProcInput
+                ->downmixIdRequested[hSelProcInput->numDownmixIdRequests] =
+                pDown->downmixId;
+            hSelProcInput->numDownmixIdRequests++;
+          }
+        }
+      }
+
+      if (hSelProcInput->baseChannelCount == -1) {
+        retVal = DRCDEC_SELECTION_PROCESS_WARNING;
+      }
+
+      if (hSelProcInput->numDownmixIdRequests == 0) {
+        retVal = DRCDEC_SELECTION_PROCESS_WARNING;
+        hSelProcInput->downmixIdRequested[0] = 0;
+        hSelProcInput->numDownmixIdRequests = 1;
+      }
+
+      break;
+
+    default:
+      return DRCDEC_SELECTION_PROCESS_NOT_OK;
+  }
+
+  return retVal;
+}
+
+/*******************************************/
+
+/* Note: Numbering of DRC pre-selection steps according to MPEG-D Part-4 DRC
+ * Amd1 */
+
+/* #1: DownmixId of DRC set matches the requested downmixId.
+   #2: Output channel layout of DRC set matches the requested layout.
+   #3: Channel count of DRC set matches the requested channel count. */
+static DRCDEC_SELECTION_PROCESS_RETURN _preSelectionRequirement123(
+    int nRequestedDownmixId, DRC_INSTRUCTIONS_UNI_DRC* pDrcInstructionUniDrc,
+    int* pMatchFound) {
+  int i;
+  *pMatchFound = 0;
+
+  for (i = 0; i < pDrcInstructionUniDrc->downmixIdCount; i++) {
+    if ((pDrcInstructionUniDrc->downmixId[i] == nRequestedDownmixId) ||
+        (pDrcInstructionUniDrc->downmixId[i] == DOWNMIX_ID_ANY_DOWNMIX) ||
+        ((pDrcInstructionUniDrc->downmixId[i] == DOWNMIX_ID_BASE_LAYOUT) &&
+         (pDrcInstructionUniDrc->drcSetId > 0))) {
+      *pMatchFound = 1;
+      break;
+    }
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+/* #4: The DRC set is not a "Fade-" or "Ducking-" only DRC set. */
+static DRCDEC_SELECTION_PROCESS_RETURN _preSelectionRequirement4(
+    DRC_INSTRUCTIONS_UNI_DRC* pDrcInstruction, int nDynamicRangeControlOn,
+    int* pMatchFound) {
+  *pMatchFound = 0;
+
+  if (nDynamicRangeControlOn == 1) {
+    if ((pDrcInstruction->drcSetEffect != EB_FADE) &&
+        (pDrcInstruction->drcSetEffect != EB_DUCK_OTHER) &&
+        (pDrcInstruction->drcSetEffect != EB_DUCK_SELF) &&
+        (pDrcInstruction->drcSetEffect != 0 || pDrcInstruction->drcSetId < 0)) {
+      *pMatchFound = 1;
+    }
+  } else {
+    *pMatchFound = 1;
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+/* #5: The number of DRC bands is supported. */
+static DRCDEC_SELECTION_PROCESS_RETURN _preSelectionRequirement5(
+    DRC_INSTRUCTIONS_UNI_DRC* pDrcInstructionUniDrc,
+    DRC_COEFFICIENTS_UNI_DRC* pCoef, int* pMatchFound) {
+  int i;
+
+  *pMatchFound = 1;
+
+  if (pCoef == NULL) /* check for parametricDRC */
+  {
+    *pMatchFound = 1;
+    return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+  }
+
+  for (i = 0; i < pDrcInstructionUniDrc->nDrcChannelGroups; i++) {
+    int indexDrcCoeff = pDrcInstructionUniDrc->gainSetIndexForChannelGroup[i];
+    int bandCount = 0;
+
+    if (indexDrcCoeff > pCoef->gainSetCount - 1) /* check for parametricDRC */
+    {
+      *pMatchFound = 1;
+      return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+    }
+
+    GAIN_SET* gainSet = &(pCoef->gainSet[indexDrcCoeff]);
+    bandCount = gainSet->bandCount;
+
+    if (bandCount > 4) {
+      *pMatchFound = 0;
+    }
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+/* #6: Independent use of DRC set is permitted.*/
+static DRCDEC_SELECTION_PROCESS_RETURN _preSelectionRequirement6(
+    DRC_INSTRUCTIONS_UNI_DRC* pDrcInstructionUniDrc, int* pMatchFound) {
+  *pMatchFound = 0;
+
+  if (((pDrcInstructionUniDrc->dependsOnDrcSetPresent == 0) &&
+       (pDrcInstructionUniDrc->noIndependentUse == 0)) ||
+      (pDrcInstructionUniDrc->dependsOnDrcSetPresent == 1)) {
+    *pMatchFound = 1;
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+/* #7: DRC sets that require EQ are only permitted if EQ is supported. */
+static DRCDEC_SELECTION_PROCESS_RETURN _preSelectionRequirement7(
+    DRC_INSTRUCTIONS_UNI_DRC* pDrcInstructionUniDrc, int* pMatchFound) {
+  *pMatchFound = 1;
+
+  if (pDrcInstructionUniDrc->requiresEq) {
+    /* EQ is not supported */
+    *pMatchFound = 0;
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+static void _setSelectionDataInfo(DRCDEC_SELECTION_DATA* pData,
+                                  FIXP_DBL loudness,
+                                  FIXP_DBL loudnessNormalizationGainDb,
+                                  FIXP_DBL loudnessNormalizationGainDbMax,
+                                  FIXP_DBL loudnessDeviationMax,
+                                  FIXP_DBL signalPeakLevel,
+                                  FIXP_DBL outputPeakLevelMax,
+                                  int applyAdjustment) {
+  FIXP_DBL adjustment = 0;
+
+  if (applyAdjustment) {
+    adjustment =
+        fMax((FIXP_DBL)0, signalPeakLevel + loudnessNormalizationGainDb -
+                              outputPeakLevelMax);
+    adjustment = fMin(adjustment, fMax((FIXP_DBL)0, loudnessDeviationMax));
+  }
+
+  pData->loudnessNormalizationGainDbAdjusted = fMin(
+      loudnessNormalizationGainDb - adjustment, loudnessNormalizationGainDbMax);
+  pData->outputLoudness = loudness + pData->loudnessNormalizationGainDbAdjusted;
+  pData->outputPeakLevel =
+      signalPeakLevel + pData->loudnessNormalizationGainDbAdjusted;
+}
+
+static int _targetLoudnessInRange(
+    DRC_INSTRUCTIONS_UNI_DRC* pDrcInstructionUniDrc, FIXP_DBL targetLoudness) {
+  int retVal = 0;
+
+  FIXP_DBL drcSetTargetLoudnessValueUpper =
+      ((FIXP_DBL)pDrcInstructionUniDrc->drcSetTargetLoudnessValueUpper)
+      << (DFRACT_BITS - 1 - 7);
+  FIXP_DBL drcSetTargetLoudnessValueLower =
+      ((FIXP_DBL)pDrcInstructionUniDrc->drcSetTargetLoudnessValueLower)
+      << (DFRACT_BITS - 1 - 7);
+
+  if (pDrcInstructionUniDrc->drcSetTargetLoudnessPresent &&
+      drcSetTargetLoudnessValueUpper >= targetLoudness &&
+      drcSetTargetLoudnessValueLower < targetLoudness) {
+    retVal = 1;
+  }
+
+  return retVal;
+}
+
+/* #8: The range of the target loudness specified for a DRC set has to include
+ * the requested decoder target loudness. */
+static DRCDEC_SELECTION_PROCESS_RETURN _preSelectionRequirement8(
+    SEL_PROC_INPUT* hSelProcInput, int downmixIdIndex,
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet,
+    DRC_INSTRUCTIONS_UNI_DRC* pDrcInstructionUniDrc,
+    DRCDEC_SELECTION* pCandidatesPotential,
+    DRCDEC_SELECTION* pCandidatesSelected, SEL_PROC_CODEC_MODE codecMode) {
+  DRCDEC_SELECTION_PROCESS_RETURN retVal = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+  int explicitPeakInformationPresent;
+  FIXP_DBL signalPeakLevel;
+  int addToCandidate = 0;
+
+  FIXP_DBL loudnessNormalizationGainDb;
+  FIXP_DBL loudness;
+
+  FIXP_DBL loudnessDeviationMax =
+      ((FIXP_DBL)hSelProcInput->loudnessDeviationMax) << (DFRACT_BITS - 1 - 7);
+  ;
+
+  if (hSelProcInput->loudnessNormalizationOn) {
+    retVal = _getLoudness(hLoudnessInfoSet, hSelProcInput->albumMode,
+                          hSelProcInput->loudnessMeasurementMethod,
+                          hSelProcInput->loudnessMeasurementSystem,
+                          hSelProcInput->targetLoudness,
+                          pDrcInstructionUniDrc->drcSetId,
+                          hSelProcInput->downmixIdRequested[downmixIdIndex],
+                          &loudnessNormalizationGainDb, &loudness);
+    if (retVal) return (retVal);
+  } else {
+    loudnessNormalizationGainDb = (FIXP_DBL)0;
+    loudness = UNDEFINED_LOUDNESS_VALUE;
+  }
+
+  retVal = _getSignalPeakLevel(
+      hSelProcInput, hUniDrcConfig, hLoudnessInfoSet, pDrcInstructionUniDrc,
+      hSelProcInput->downmixIdRequested[downmixIdIndex],
+      &explicitPeakInformationPresent, &signalPeakLevel, codecMode
+
+  );
+  if (retVal) return (retVal);
+
+  if (hSelProcInput->dynamicRangeControlOn) {
+    if (explicitPeakInformationPresent == 0) {
+      if (pDrcInstructionUniDrc->drcSetTargetLoudnessPresent &&
+          ((hSelProcInput->loudnessNormalizationOn &&
+            _targetLoudnessInRange(pDrcInstructionUniDrc,
+                                   hSelProcInput->targetLoudness)) ||
+           !hSelProcInput->loudnessNormalizationOn)) {
+        DRCDEC_SELECTION_DATA* pData =
+            _drcdec_selection_addNew(pCandidatesSelected);
+        if (pData == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+        _setSelectionDataInfo(pData, loudness, loudnessNormalizationGainDb,
+                              hSelProcInput->loudnessNormalizationGainDbMax,
+                              loudnessDeviationMax, signalPeakLevel,
+                              hSelProcInput->outputPeakLevelMax, 0);
+        pData->downmixIdRequestIndex = downmixIdIndex;
+        pData->pInst = pDrcInstructionUniDrc;
+        pData->selectionFlag =
+            1; /* signal pre-selection step dealing with drcSetTargetLoudness */
+
+        if (hSelProcInput->loudnessNormalizationOn) {
+          pData->outputPeakLevel =
+              hSelProcInput->targetLoudness -
+              (((FIXP_DBL)pData->pInst->drcSetTargetLoudnessValueUpper)
+               << (DFRACT_BITS - 1 - 7));
+        } else {
+          pData->outputPeakLevel = (FIXP_DBL)0;
+        }
+      } else {
+        if ((!hSelProcInput->loudnessNormalizationOn) ||
+            (!pDrcInstructionUniDrc->drcSetTargetLoudnessPresent) ||
+            (hSelProcInput->loudnessNormalizationOn &&
+             _targetLoudnessInRange(pDrcInstructionUniDrc,
+                                    hSelProcInput->targetLoudness))) {
+          addToCandidate = 1;
+        }
+      }
+    } else {
+      addToCandidate = 1;
+    }
+
+    if (addToCandidate) {
+      DRCDEC_SELECTION_DATA* pData =
+          _drcdec_selection_addNew(pCandidatesPotential);
+      if (pData == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+      _setSelectionDataInfo(pData, loudness, loudnessNormalizationGainDb,
+                            hSelProcInput->loudnessNormalizationGainDbMax,
+                            loudnessDeviationMax, signalPeakLevel,
+                            hSelProcInput->outputPeakLevelMax, 0);
+      pData->downmixIdRequestIndex = downmixIdIndex;
+      pData->pInst = pDrcInstructionUniDrc;
+      pData->selectionFlag = 0;
+    }
+  } else {
+    if (pDrcInstructionUniDrc->drcSetId < 0) {
+      DRCDEC_SELECTION_DATA* pData =
+          _drcdec_selection_addNew(pCandidatesSelected);
+      if (pData == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+      _setSelectionDataInfo(pData, loudness, loudnessNormalizationGainDb,
+                            hSelProcInput->loudnessNormalizationGainDbMax,
+                            loudnessDeviationMax, signalPeakLevel,
+                            hSelProcInput->outputPeakLevelMax, 1);
+
+      pData->downmixIdRequestIndex = downmixIdIndex;
+      pData->pInst = pDrcInstructionUniDrc;
+      pData->selectionFlag = 0;
+    }
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+/* #9: Clipping is minimized. */
+static DRCDEC_SELECTION_PROCESS_RETURN _preSelectionRequirement9(
+    SEL_PROC_INPUT* hSelProcInput, DRCDEC_SELECTION* pCandidatesPotential,
+    DRCDEC_SELECTION* pCandidatesSelected) {
+  int i;
+
+  for (i = 0; i < _drcdec_selection_getNumber(pCandidatesPotential); i++) {
+    DRCDEC_SELECTION_DATA* pCandidate =
+        _drcdec_selection_getAt(pCandidatesPotential, i);
+    if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+    if (pCandidate->outputPeakLevel <= hSelProcInput->outputPeakLevelMax) {
+      if (_drcdec_selection_add(pCandidatesSelected, pCandidate) == NULL)
+        return DRCDEC_SELECTION_PROCESS_NOT_OK;
+    }
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _drcSetPreSelectionSingleInstruction(
+    SEL_PROC_INPUT* hSelProcInput, int downmixIdIndex,
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet,
+    DRC_INSTRUCTIONS_UNI_DRC* pDrcInstructionUniDrc,
+    DRCDEC_SELECTION* pCandidatesPotential,
+    DRCDEC_SELECTION* pCandidatesSelected, SEL_PROC_CODEC_MODE codecMode) {
+  DRCDEC_SELECTION_PROCESS_RETURN retVal = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+  int matchFound = 0;
+  DRC_COEFFICIENTS_UNI_DRC* pCoef =
+      selectDrcCoefficients(hUniDrcConfig, LOCATION_SELECTED);
+
+  retVal = _preSelectionRequirement123(
+      hSelProcInput->downmixIdRequested[downmixIdIndex], pDrcInstructionUniDrc,
+      &matchFound);
+
+  if (!retVal && matchFound)
+    retVal = _preSelectionRequirement4(pDrcInstructionUniDrc,
+                                       hSelProcInput->dynamicRangeControlOn,
+                                       &matchFound);
+
+  if (!retVal && matchFound)
+    retVal =
+        _preSelectionRequirement5(pDrcInstructionUniDrc, pCoef, &matchFound);
+
+  if (!retVal && matchFound)
+    retVal = _preSelectionRequirement6(pDrcInstructionUniDrc, &matchFound);
+
+  if (!retVal && matchFound)
+    retVal = _preSelectionRequirement7(pDrcInstructionUniDrc, &matchFound);
+
+  if (!retVal && matchFound)
+    retVal = _preSelectionRequirement8(
+        hSelProcInput, downmixIdIndex, hUniDrcConfig, hLoudnessInfoSet,
+        pDrcInstructionUniDrc, pCandidatesPotential, pCandidatesSelected,
+        codecMode);
+
+  return retVal;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _drcSetSelectionAddCandidates(
+    SEL_PROC_INPUT* hSelProcInput, DRCDEC_SELECTION* pCandidatesPotential,
+    DRCDEC_SELECTION* pCandidatesSelected) {
+  DRCDEC_SELECTION_PROCESS_RETURN retVal = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+  int nHitCount = 0;
+  int i;
+
+  DRCDEC_SELECTION_DATA* pCandidate = NULL;
+  DRC_INSTRUCTIONS_UNI_DRC* pDrcInstructionUniDrc = NULL;
+
+  for (i = 0; i < _drcdec_selection_getNumber(pCandidatesPotential); i++) {
+    pCandidate = _drcdec_selection_getAt(pCandidatesPotential, i);
+    if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+    pDrcInstructionUniDrc = pCandidate->pInst;
+
+    if (_targetLoudnessInRange(pDrcInstructionUniDrc,
+                               hSelProcInput->targetLoudness)) {
+      nHitCount++;
+    }
+  }
+
+  if (nHitCount != 0) {
+    for (i = 0; i < _drcdec_selection_getNumber(pCandidatesPotential); i++) {
+      pCandidate = _drcdec_selection_getAt(pCandidatesPotential, i);
+      if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+      pDrcInstructionUniDrc = pCandidate->pInst;
+
+      if (_targetLoudnessInRange(pDrcInstructionUniDrc,
+                                 hSelProcInput->targetLoudness)) {
+        if (_drcdec_selection_add(pCandidatesSelected, pCandidate) == NULL)
+          return DRCDEC_SELECTION_PROCESS_NOT_OK;
+      }
+    }
+  } else {
+    FIXP_DBL lowestPeakLevel = MAXVAL_DBL; /* e = 7 */
+    FIXP_DBL peakLevel = 0;                /* e = 7 */
+
+    for (i = 0; i < _drcdec_selection_getNumber(pCandidatesPotential); i++) {
+      pCandidate = _drcdec_selection_getAt(pCandidatesPotential, i);
+      if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+      peakLevel = pCandidate->outputPeakLevel;
+
+      if (peakLevel < lowestPeakLevel) {
+        lowestPeakLevel = peakLevel;
+      }
+    }
+
+    /* add all with lowest peak level or max 1dB above */
+    for (i = 0; i < _drcdec_selection_getNumber(pCandidatesPotential); i++) {
+      FIXP_DBL loudnessDeviationMax =
+          ((FIXP_DBL)hSelProcInput->loudnessDeviationMax)
+          << (DFRACT_BITS - 1 - 7); /* e = 7 */
+
+      pCandidate = _drcdec_selection_getAt(pCandidatesPotential, i);
+      if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+      peakLevel = pCandidate->outputPeakLevel;
+
+      if (peakLevel == lowestPeakLevel ||
+          peakLevel <=
+              lowestPeakLevel + FL2FXCONST_DBL(1.0f / (float)(1 << 7))) {
+        FIXP_DBL adjustment =
+            fMax((FIXP_DBL)0, peakLevel - hSelProcInput->outputPeakLevelMax);
+        adjustment = fMin(adjustment, fMax((FIXP_DBL)0, loudnessDeviationMax));
+
+        pCandidate->loudnessNormalizationGainDbAdjusted -= adjustment;
+        pCandidate->outputPeakLevel -= adjustment;
+        pCandidate->outputLoudness -= adjustment;
+        if (_drcdec_selection_add(pCandidatesSelected, pCandidate) == NULL)
+          return DRCDEC_SELECTION_PROCESS_NOT_OK;
+      }
+    }
+  }
+
+  return retVal;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _dependentDrcInstruction(
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig, DRC_INSTRUCTIONS_UNI_DRC* pInst,
+    DRC_INSTRUCTIONS_UNI_DRC** ppDrcInstructionsDependent) {
+  int i;
+  DRC_INSTRUCTIONS_UNI_DRC* pDependentDrc = NULL;
+
+  for (i = 0; i < hUniDrcConfig->drcInstructionsUniDrcCount; i++) {
+    pDependentDrc =
+        (DRC_INSTRUCTIONS_UNI_DRC*)&(hUniDrcConfig->drcInstructionsUniDrc[i]);
+
+    if (pDependentDrc->drcSetId == pInst->dependsOnDrcSet) {
+      break;
+    }
+  }
+
+  if (i == hUniDrcConfig->drcInstructionsUniDrcCount) {
+    return DRCDEC_SELECTION_PROCESS_NOT_OK;
+  }
+
+  if (pDependentDrc->dependsOnDrcSetPresent == 1) {
+    return DRCDEC_SELECTION_PROCESS_NOT_OK;
+  }
+
+  *ppDrcInstructionsDependent = pDependentDrc;
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _selectDrcSetEffectNone(
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig, DRCDEC_SELECTION* pCandidatesPotential,
+    DRCDEC_SELECTION* pCandidatesSelected) {
+  int i;
+
+  for (i = 0; i < _drcdec_selection_getNumber(pCandidatesPotential); i++) {
+    DRCDEC_SELECTION_DATA* pCandidate =
+        _drcdec_selection_getAt(pCandidatesPotential, i);
+    if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+    if ((pCandidate->pInst->drcSetEffect & 0xff) == 0) {
+      if (_drcdec_selection_add(pCandidatesSelected, pCandidate) == NULL)
+        return DRCDEC_SELECTION_PROCESS_NOT_OK;
+    }
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _selectSingleEffectType(
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig, DRC_EFFECT_TYPE_REQUEST effectType,
+    DRCDEC_SELECTION* pCandidatesPotential,
+    DRCDEC_SELECTION* pCandidatesSelected) {
+  int i;
+  DRCDEC_SELECTION_PROCESS_RETURN retVal = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+  DRC_INSTRUCTIONS_UNI_DRC* pInst;
+  DRC_INSTRUCTIONS_UNI_DRC* pDrcInstructionsDependent;
+
+  if (effectType == DETR_NONE) {
+    retVal = _selectDrcSetEffectNone(hUniDrcConfig, pCandidatesPotential,
+                                     pCandidatesSelected);
+    if (retVal) return (retVal);
+  } else {
+    int effectBitPosition = 1 << (effectType - 1);
+
+    for (i = 0; i < _drcdec_selection_getNumber(pCandidatesPotential); i++) {
+      DRCDEC_SELECTION_DATA* pCandidate =
+          _drcdec_selection_getAt(pCandidatesPotential, i);
+      if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+      pInst = pCandidate->pInst;
+
+      if (!pInst->dependsOnDrcSetPresent) {
+        if ((pInst->drcSetEffect & effectBitPosition)) {
+          if (_drcdec_selection_add(pCandidatesSelected, pCandidate) == NULL)
+            return DRCDEC_SELECTION_PROCESS_NOT_OK;
+        }
+      } else {
+        retVal = _dependentDrcInstruction(hUniDrcConfig, pInst,
+                                          &pDrcInstructionsDependent);
+        if (retVal) return (retVal);
+
+        if (((pInst->drcSetEffect & effectBitPosition)) ||
+            ((pDrcInstructionsDependent->drcSetEffect & effectBitPosition))) {
+          if (_drcdec_selection_add(pCandidatesSelected, pCandidate) == NULL)
+            return DRCDEC_SELECTION_PROCESS_NOT_OK;
+        }
+      }
+    }
+  }
+
+  return retVal;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _selectEffectTypeFeature(
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig, DRC_FEATURE_REQUEST drcFeatureRequest,
+    DRCDEC_SELECTION** ppCandidatesPotential,
+    DRCDEC_SELECTION** ppCandidatesSelected) {
+  DRCDEC_SELECTION_PROCESS_RETURN retVal = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+  int i;
+  int desiredEffectTypeFound = 0;
+
+  for (i = 0; i < drcFeatureRequest.drcEffectType.numRequestsDesired; i++) {
+    retVal = _selectSingleEffectType(
+        hUniDrcConfig, drcFeatureRequest.drcEffectType.request[i],
+        *ppCandidatesPotential, *ppCandidatesSelected);
+    if (retVal) return (retVal);
+
+    if (_drcdec_selection_getNumber(*ppCandidatesSelected)) {
+      desiredEffectTypeFound = 1;
+      _swapSelectionAndClear(ppCandidatesPotential, ppCandidatesSelected);
+    }
+  }
+
+  if (!desiredEffectTypeFound) {
+    for (i = drcFeatureRequest.drcEffectType.numRequestsDesired;
+         i < drcFeatureRequest.drcEffectType.numRequests; i++) {
+      retVal = _selectSingleEffectType(
+          hUniDrcConfig, drcFeatureRequest.drcEffectType.request[i],
+          *ppCandidatesPotential, *ppCandidatesSelected);
+      if (retVal) return (retVal);
+
+      if (_drcdec_selection_getNumber(*ppCandidatesSelected)) {
+        _swapSelectionAndClear(ppCandidatesPotential, ppCandidatesSelected);
+        break;
+      }
+    }
+  }
+
+  _swapSelection(ppCandidatesPotential, ppCandidatesSelected);
+
+  return retVal;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _selectDynamicRange(
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet,
+    DRC_FEATURE_REQUEST drcFeatureRequest, UCHAR* pDownmixIdRequested,
+    int albumMode, DRCDEC_SELECTION* pCandidatesPotential,
+    DRCDEC_SELECTION* ppCandidatesSelected) {
+  DRCDEC_SELECTION_PROCESS_RETURN retVal = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+  int i;
+  int peakToAveragePresent;
+  FIXP_DBL peakToAverage;
+
+  FIXP_DBL minVal = MAXVAL_DBL;
+  FIXP_DBL val = 0;
+
+  int numSelectedCandidates = _drcdec_selection_getNumber(ppCandidatesSelected);
+
+  for (i = 0; i < _drcdec_selection_getNumber(pCandidatesPotential); i++) {
+    DRCDEC_SELECTION_DATA* pCandidate =
+        _drcdec_selection_getAt(pCandidatesPotential, i);
+    if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+    retVal = _dynamicRangeMeasurement(
+        hLoudnessInfoSet, pCandidate->pInst,
+        pDownmixIdRequested[pCandidate->downmixIdRequestIndex],
+        drcFeatureRequest.dynamicRange.measurementRequestType, albumMode,
+        &peakToAveragePresent, &peakToAverage);
+    if (retVal) return (retVal);
+
+    if (peakToAveragePresent) {
+      if (!drcFeatureRequest.dynamicRange.requestedIsRange) {
+        val = fAbs(drcFeatureRequest.dynamicRange.requestValue - peakToAverage);
+
+        if (minVal > val) {
+          minVal = val;
+
+          _drcdec_selection_setNumber(ppCandidatesSelected,
+                                      numSelectedCandidates);
+        }
+        if (_drcdec_selection_add(ppCandidatesSelected, pCandidate) == NULL)
+          return DRCDEC_SELECTION_PROCESS_NOT_OK;
+      } else {
+        if ((peakToAverage >= drcFeatureRequest.dynamicRange.requestValueMin) &&
+            (peakToAverage <= drcFeatureRequest.dynamicRange.requestValueMax)) {
+          if (_drcdec_selection_add(ppCandidatesSelected, pCandidate) == NULL)
+            return DRCDEC_SELECTION_PROCESS_NOT_OK;
+        }
+      }
+    }
+  }
+
+  return retVal;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _selectSingleDrcCharacteristic(
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig, int requestedDrcCharacteristic,
+    DRCDEC_SELECTION** ppCandidatesPotential,
+    DRCDEC_SELECTION** ppCandidatesSelected) {
+  int i, j, b;
+  int hit = 0;
+
+  DRC_INSTRUCTIONS_UNI_DRC* pInst = NULL;
+  DRC_COEFFICIENTS_UNI_DRC* pCoef = NULL;
+  GAIN_SET* pGainSet = NULL;
+
+  if (requestedDrcCharacteristic < 1) {
+    return DRCDEC_SELECTION_PROCESS_NOT_OK;
+  }
+
+  pCoef = selectDrcCoefficients(hUniDrcConfig, LOCATION_SELECTED);
+
+  if (pCoef == NULL) /* check for parametricDRC */
+  {
+    return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+  }
+
+  for (i = 0; i < _drcdec_selection_getNumber(*ppCandidatesPotential); i++) {
+    DRCDEC_SELECTION_DATA* pCandidate =
+        _drcdec_selection_getAt(*ppCandidatesPotential, i);
+    if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+    pInst = pCandidate->pInst;
+
+    hit = 0;
+
+    for (j = 0; j < pInst->nDrcChannelGroups; j++) {
+      int bandCount = 0;
+      int indexDrcCoeff = pInst->gainSetIndexForChannelGroup[j];
+
+      if (indexDrcCoeff > pCoef->gainSetCount - 1) /* check for parametricDRC */
+      {
+        return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+      }
+
+      pGainSet = &(pCoef->gainSet[indexDrcCoeff]);
+      bandCount = pGainSet->bandCount;
+
+      for (b = 0; b < bandCount; b++) {
+        if ((pGainSet->drcCharacteristic[b].isCICP) &&
+            (pGainSet->drcCharacteristic[b].cicpIndex ==
+             requestedDrcCharacteristic)) {
+          hit = 1;
+          break;
+        }
+      }
+
+      if (hit) break;
+    }
+
+    if (hit) {
+      if (_drcdec_selection_add(*ppCandidatesSelected, pCandidate) == NULL)
+        return DRCDEC_SELECTION_PROCESS_NOT_OK;
+    }
+  }
+
+  if (_drcdec_selection_getNumber(*ppCandidatesSelected)) {
+    _swapSelectionAndClear(ppCandidatesPotential, ppCandidatesSelected);
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _selectDrcCharacteristic(
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig, int drcCharacteristicRequested,
+    DRCDEC_SELECTION** ppCandidatesPotential,
+    DRCDEC_SELECTION** ppCandidatesSelected) {
+  DRCDEC_SELECTION_PROCESS_RETURN retVal = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+
+  const int secondTry[12] = {0, 2, 3, 4, 5, 6, 5, 9, 10, 7, 8, 10};
+
+  retVal = _selectSingleDrcCharacteristic(
+      hUniDrcConfig, drcCharacteristicRequested, ppCandidatesPotential,
+      ppCandidatesSelected);
+  if (retVal) return (retVal);
+
+  if ((drcCharacteristicRequested <= 11) &&
+      (_drcdec_selection_getNumber(*ppCandidatesSelected) == 0)) {
+    retVal = _selectSingleDrcCharacteristic(
+        hUniDrcConfig, secondTry[drcCharacteristicRequested],
+        ppCandidatesPotential, ppCandidatesSelected);
+    if (retVal) return (retVal);
+  }
+
+  if (_drcdec_selection_getNumber(*ppCandidatesSelected) == 0) {
+    if ((drcCharacteristicRequested >= 2) &&
+        (drcCharacteristicRequested <= 5)) {
+      retVal = _selectSingleDrcCharacteristic(
+          hUniDrcConfig, drcCharacteristicRequested - 1, ppCandidatesPotential,
+          ppCandidatesSelected);
+      if (retVal) return (retVal);
+    } else if (drcCharacteristicRequested == 11) {
+      retVal = _selectSingleDrcCharacteristic(
+          hUniDrcConfig, 9, ppCandidatesPotential, ppCandidatesSelected);
+      if (retVal) return (retVal);
+    }
+  }
+
+  _swapSelection(ppCandidatesPotential, ppCandidatesSelected);
+
+  return retVal;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _drcSetFinalSelection_peakValue0(
+    DRCDEC_SELECTION* pCandidatesPotential,
+    DRCDEC_SELECTION* pCandidatesSelected) {
+  int i;
+
+  for (i = 0; i < _drcdec_selection_getNumber(pCandidatesPotential); i++) {
+    DRCDEC_SELECTION_DATA* pCandidate =
+        _drcdec_selection_getAt(pCandidatesPotential, i);
+    if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+    if (pCandidate->outputPeakLevel <= FIXP_DBL(0)) {
+      if (_drcdec_selection_add(pCandidatesSelected, pCandidate) == NULL)
+        return DRCDEC_SELECTION_PROCESS_NOT_OK;
+    }
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _drcSetFinalSelection_downmixId(
+    HANDLE_SEL_PROC_INPUT hSelProcInput,
+    DRCDEC_SELECTION** ppCandidatesPotential,
+    DRCDEC_SELECTION** ppCandidatesSelected) {
+  int i, j;
+  DRCDEC_SELECTION_DATA* pCandidate = NULL;
+  DRC_INSTRUCTIONS_UNI_DRC* pInst = NULL;
+
+  for (i = 0; i < _drcdec_selection_getNumber(*ppCandidatesPotential); i++) {
+    pCandidate = _drcdec_selection_getAt(*ppCandidatesPotential, i);
+    if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+    pInst = pCandidate->pInst;
+
+    for (j = 0; j < pInst->downmixIdCount; j++) {
+      if (DOWNMIX_ID_BASE_LAYOUT != pInst->downmixId[j] &&
+          DOWNMIX_ID_ANY_DOWNMIX != pInst->downmixId[j] &&
+          hSelProcInput
+                  ->downmixIdRequested[pCandidate->downmixIdRequestIndex] ==
+              pInst->downmixId[j]) {
+        if (_drcdec_selection_add(*ppCandidatesSelected, pCandidate) == NULL)
+          return DRCDEC_SELECTION_PROCESS_NOT_OK;
+      }
+    }
+  }
+
+  if (_drcdec_selection_getNumber(*ppCandidatesSelected) == 0) {
+    _swapSelection(ppCandidatesPotential, ppCandidatesSelected);
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+static int _crossSum(int value) {
+  int sum = 0;
+
+  while (value != 0) {
+    if ((value & 1) == 1) {
+      sum++;
+    }
+
+    value >>= 1;
+  }
+
+  return sum;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _drcSetFinalSelection_effectTypes(
+    DRCDEC_SELECTION* pCandidatesPotential,
+    DRCDEC_SELECTION* pCandidatesSelected) {
+  int i;
+  int minNumEffects = 1000;
+  int numEffects = 0;
+  int effects = 0;
+  DRCDEC_SELECTION_DATA* pCandidate = NULL;
+  DRC_INSTRUCTIONS_UNI_DRC* pInst = NULL;
+
+  for (i = 0; i < _drcdec_selection_getNumber(pCandidatesPotential); i++) {
+    pCandidate = _drcdec_selection_getAt(pCandidatesPotential, i);
+    if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+    pInst = pCandidate->pInst;
+
+    effects = pInst->drcSetEffect;
+    effects &= 0xffff ^ (EB_GENERAL_COMPR);
+    numEffects = _crossSum(effects);
+
+    if (numEffects < minNumEffects) {
+      minNumEffects = numEffects;
+    }
+  }
+
+  /* add all with minimum number of effects */
+  for (i = 0; i < _drcdec_selection_getNumber(pCandidatesPotential); i++) {
+    pCandidate = _drcdec_selection_getAt(pCandidatesPotential, i);
+    if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+    pInst = pCandidate->pInst;
+
+    effects = pInst->drcSetEffect;
+    effects &= 0xffff ^ (EB_GENERAL_COMPR);
+    numEffects = _crossSum(effects);
+
+    if (numEffects == minNumEffects) {
+      if (_drcdec_selection_add(pCandidatesSelected, pCandidate) == NULL)
+        return DRCDEC_SELECTION_PROCESS_NOT_OK;
+    }
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _selectSmallestTargetLoudnessValueUpper(
+    DRCDEC_SELECTION* pCandidatesPotential,
+    DRCDEC_SELECTION* pCandidatesSelected) {
+  int i;
+  SCHAR minVal = 0x7F;
+  SCHAR val = 0;
+  DRCDEC_SELECTION_DATA* pCandidate = NULL;
+
+  for (i = 0; i < _drcdec_selection_getNumber(pCandidatesPotential); i++) {
+    pCandidate = _drcdec_selection_getAt(pCandidatesPotential, i);
+    if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+    val = pCandidate->pInst->drcSetTargetLoudnessValueUpper;
+
+    if (val < minVal) {
+      minVal = val;
+    }
+  }
+
+  /* add all with same smallest drcSetTargetLoudnessValueUpper */
+  for (i = 0; i < _drcdec_selection_getNumber(pCandidatesPotential); i++) {
+    pCandidate = _drcdec_selection_getAt(pCandidatesPotential, i);
+    if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+    val = pCandidate->pInst->drcSetTargetLoudnessValueUpper;
+
+    if (val == minVal) {
+      if (_drcdec_selection_add(pCandidatesSelected, pCandidate) == NULL)
+        return DRCDEC_SELECTION_PROCESS_NOT_OK;
+    }
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _drcSetFinalSelection_targetLoudness(
+    FIXP_DBL targetLoudness, DRCDEC_SELECTION* pCandidatesPotential,
+    DRCDEC_SELECTION* pCandidatesSelected) {
+  DRCDEC_SELECTION_PROCESS_RETURN retVal = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+  int i;
+  DRCDEC_SELECTION_DATA* pCandidate = NULL;
+
+  for (i = 0; i < _drcdec_selection_getNumber(pCandidatesPotential); i++) {
+    pCandidate = _drcdec_selection_getAt(pCandidatesPotential, i);
+    if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+    if (pCandidate->selectionFlag == 0) {
+      if (_drcdec_selection_add(pCandidatesSelected, pCandidate) == NULL)
+        return DRCDEC_SELECTION_PROCESS_NOT_OK;
+    }
+  }
+
+  if (_drcdec_selection_getNumber(pCandidatesSelected) == 0) {
+    retVal = _selectSmallestTargetLoudnessValueUpper(pCandidatesPotential,
+                                                     pCandidatesSelected);
+    if (retVal) return (retVal);
+  }
+
+  if (_drcdec_selection_getNumber(pCandidatesSelected) > 1) {
+    DRC_INSTRUCTIONS_UNI_DRC* pDrcInstructionUniDrc = NULL;
+
+    _swapSelectionAndClear(&pCandidatesPotential, &pCandidatesSelected);
+
+    for (i = 0; i < _drcdec_selection_getNumber(pCandidatesPotential); i++) {
+      pCandidate = _drcdec_selection_getAt(pCandidatesPotential, i);
+      if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+      pDrcInstructionUniDrc = pCandidate->pInst;
+
+      if (_targetLoudnessInRange(pDrcInstructionUniDrc, targetLoudness)) {
+        if (_drcdec_selection_add(pCandidatesSelected, pCandidate) == NULL)
+          return DRCDEC_SELECTION_PROCESS_NOT_OK;
+      }
+    }
+
+    if (_drcdec_selection_getNumber(pCandidatesSelected) > 1) {
+      _swapSelectionAndClear(&pCandidatesPotential, &pCandidatesSelected);
+
+      retVal = _selectSmallestTargetLoudnessValueUpper(pCandidatesPotential,
+                                                       pCandidatesSelected);
+      if (retVal) return (retVal);
+    }
+  }
+
+  return retVal;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _drcSetFinalSelection_peakValueLargest(
+    DRCDEC_SELECTION* pCandidatesPotential,
+    DRCDEC_SELECTION* pCandidatesSelected) {
+  int i;
+  FIXP_DBL largestPeakLevel = MINVAL_DBL;
+  FIXP_DBL peakLevel = 0;
+  DRCDEC_SELECTION_DATA* pCandidate = NULL;
+
+  for (i = 0; i < _drcdec_selection_getNumber(pCandidatesPotential); i++) {
+    pCandidate = _drcdec_selection_getAt(pCandidatesPotential, i);
+    if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+    peakLevel = pCandidate->outputPeakLevel;
+
+    if (peakLevel > largestPeakLevel) {
+      largestPeakLevel = peakLevel;
+    }
+  }
+
+  /* add all with same largest peak level */
+  for (i = 0; i < _drcdec_selection_getNumber(pCandidatesPotential); i++) {
+    pCandidate = _drcdec_selection_getAt(pCandidatesPotential, i);
+    if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+    peakLevel = pCandidate->outputPeakLevel;
+
+    if (peakLevel == largestPeakLevel) {
+      if (_drcdec_selection_add(pCandidatesSelected, pCandidate) == NULL)
+        return DRCDEC_SELECTION_PROCESS_NOT_OK;
+    }
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _drcSetFinalSelection_drcSetId(
+    DRCDEC_SELECTION* pCandidatesPotential,
+    DRCDEC_SELECTION* pCandidatesSelected) {
+  int i;
+  int largestId = -1000;
+  int id = 0;
+  DRCDEC_SELECTION_DATA* pCandidate = NULL;
+  DRCDEC_SELECTION_DATA* pCandidateSelected = NULL;
+
+  for (i = 0; i < _drcdec_selection_getNumber(pCandidatesPotential); i++) {
+    pCandidate = _drcdec_selection_getAt(pCandidatesPotential, i);
+    if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+    id = pCandidate->pInst->drcSetId;
+
+    if (id > largestId) {
+      largestId = id;
+      pCandidateSelected = pCandidate;
+    }
+  }
+
+  if (pCandidateSelected != NULL) {
+    if (_drcdec_selection_add(pCandidatesSelected, pCandidateSelected) == NULL)
+      return DRCDEC_SELECTION_PROCESS_NOT_OK;
+  } else {
+    return DRCDEC_SELECTION_PROCESS_NOT_OK;
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _drcSetFinalSelection(
+    HANDLE_SEL_PROC_INPUT hSelProcInput, HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+    DRCDEC_SELECTION** ppCandidatesPotential,
+    DRCDEC_SELECTION** ppCandidatesSelected, SEL_PROC_CODEC_MODE codecMode) {
+  DRCDEC_SELECTION_PROCESS_RETURN retVal = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+
+  if (_drcdec_selection_getNumber(*ppCandidatesPotential) == 0) {
+    return DRCDEC_SELECTION_PROCESS_NOT_OK;
+  } else if (_drcdec_selection_getNumber(*ppCandidatesPotential) == 1) {
+    _swapSelection(ppCandidatesPotential, ppCandidatesSelected);
+    /* finished */
+  } else /* > 1 */
+  {
+    retVal = _drcSetFinalSelection_peakValue0(*ppCandidatesPotential,
+                                              *ppCandidatesSelected);
+    if (retVal) return (retVal);
+
+    if (_drcdec_selection_getNumber(*ppCandidatesSelected) > 1) {
+      _swapSelectionAndClear(ppCandidatesPotential, ppCandidatesSelected);
+      retVal = _drcSetFinalSelection_downmixId(
+          hSelProcInput, ppCandidatesPotential, ppCandidatesSelected);
+      if (retVal) return (retVal);
+    }
+
+    if (_drcdec_selection_getNumber(*ppCandidatesSelected) > 1) {
+      _swapSelectionAndClear(ppCandidatesPotential, ppCandidatesSelected);
+      retVal = _drcSetFinalSelection_effectTypes(*ppCandidatesPotential,
+                                                 *ppCandidatesSelected);
+      if (retVal) return (retVal);
+    }
+
+    if (_drcdec_selection_getNumber(*ppCandidatesSelected) > 1) {
+      _swapSelectionAndClear(ppCandidatesPotential, ppCandidatesSelected);
+      retVal = _drcSetFinalSelection_targetLoudness(
+          hSelProcInput->targetLoudness, *ppCandidatesPotential,
+          *ppCandidatesSelected);
+      if (retVal) return (retVal);
+    }
+
+    if (_drcdec_selection_getNumber(*ppCandidatesSelected) > 1) {
+      _swapSelectionAndClear(ppCandidatesPotential, ppCandidatesSelected);
+      retVal = _drcSetFinalSelection_peakValueLargest(*ppCandidatesPotential,
+                                                      *ppCandidatesSelected);
+      if (retVal) return (retVal);
+    }
+
+    if (_drcdec_selection_getNumber(*ppCandidatesSelected) > 1) {
+      _swapSelectionAndClear(ppCandidatesPotential, ppCandidatesSelected);
+      retVal = _drcSetFinalSelection_drcSetId(*ppCandidatesPotential,
+                                              *ppCandidatesSelected);
+      if (retVal) return (retVal);
+    }
+  }
+
+  if (_drcdec_selection_getNumber(*ppCandidatesSelected) == 0) {
+    return DRCDEC_SELECTION_PROCESS_NOT_OK;
+  }
+
+  return retVal;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _generateVirtualDrcSets(
+    HANDLE_SEL_PROC_INPUT hSelProcInput, HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+    SEL_PROC_CODEC_MODE codecMode) {
+  int i;
+  int nMixes = hUniDrcConfig->downmixInstructionsCount + 1;
+  int index = hUniDrcConfig->drcInstructionsUniDrcCount;
+  int indexVirtual = -1;
+  DRC_INSTRUCTIONS_UNI_DRC* pDrcInstruction =
+      &(hUniDrcConfig->drcInstructionsUniDrc[index]);
+
+  if (codecMode == SEL_PROC_MPEG_H_3DA) {
+    nMixes = 1;
+  }
+
+  if ((index + nMixes) > (12 + 1 + 6)) {
+    return DRCDEC_SELECTION_PROCESS_NOT_OK;
+  }
+
+  FDKmemset(pDrcInstruction, 0, sizeof(DRC_INSTRUCTIONS_UNI_DRC));
+
+  pDrcInstruction->drcSetId = indexVirtual;
+  index++;
+  indexVirtual--;
+  pDrcInstruction->downmixIdCount = 1;
+
+  if ((codecMode == SEL_PROC_MPEG_H_3DA) &&
+      (hSelProcInput->numDownmixIdRequests)) {
+    pDrcInstruction->downmixId[0] = hSelProcInput->downmixIdRequested[0];
+  } else {
+    pDrcInstruction->downmixId[0] = DOWNMIX_ID_BASE_LAYOUT;
+  }
+
+  for (i = 1; i < nMixes; i++) {
+    pDrcInstruction = &(hUniDrcConfig->drcInstructionsUniDrc[index]);
+    FDKmemset(pDrcInstruction, 0, sizeof(DRC_INSTRUCTIONS_UNI_DRC));
+    pDrcInstruction->drcSetId = indexVirtual;
+    pDrcInstruction->downmixId[0] =
+        hUniDrcConfig->downmixInstructions[i - 1].downmixId;
+    pDrcInstruction->downmixIdCount = 1;
+    index++;
+    indexVirtual--;
+  }
+
+  hUniDrcConfig->drcInstructionsCountInclVirtual =
+      hUniDrcConfig->drcInstructionsUniDrcCount + nMixes;
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _generateOutputInfo(
+    HANDLE_SEL_PROC_INPUT hSelProcInput, HANDLE_SEL_PROC_OUTPUT hSelProcOutput,
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet,
+    DRCDEC_SELECTION_DATA* pSelectionData, SEL_PROC_CODEC_MODE codecMode) {
+  DRCDEC_SELECTION_PROCESS_RETURN retVal = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+
+  int i, j;
+  int hasDependend = 0;
+  int hasFading = 0;
+  int hasDucking = 0;
+  int selectedDrcSetIds;
+  int selectedDownmixIds;
+  FIXP_DBL mixingLevel = 0;
+  int albumMode = hSelProcInput->albumMode;
+  UCHAR* pDownmixIdRequested = hSelProcInput->downmixIdRequested;
+  FIXP_SGL boost = hSelProcInput->boost;
+  FIXP_SGL compress = hSelProcInput->compress;
+
+  hSelProcOutput->numSelectedDrcSets = 1;
+  hSelProcOutput->selectedDrcSetIds[0] = pSelectionData->pInst->drcSetId;
+  hSelProcOutput->selectedDownmixIds[0] =
+      pSelectionData->pInst->drcApplyToDownmix == 1
+          ? pSelectionData->pInst->downmixId[0]
+          : 0;
+  hSelProcOutput->loudnessNormalizationGainDb =
+      pSelectionData->loudnessNormalizationGainDbAdjusted +
+      hSelProcInput->loudnessNormalizationGainModificationDb;
+  hSelProcOutput->outputPeakLevelDb = pSelectionData->outputPeakLevel;
+
+  hSelProcOutput->boost = boost;
+  hSelProcOutput->compress = compress;
+  hSelProcOutput->baseChannelCount =
+      hUniDrcConfig->channelLayout.baseChannelCount;
+  hSelProcOutput->targetChannelCount =
+      hUniDrcConfig->channelLayout.baseChannelCount;
+  hSelProcOutput->activeDownmixId =
+      pDownmixIdRequested[pSelectionData->downmixIdRequestIndex];
+
+  _getMixingLevel(hLoudnessInfoSet, *pDownmixIdRequested,
+                  hSelProcOutput->selectedDrcSetIds[0], albumMode,
+                  &mixingLevel);
+  hSelProcOutput->mixingLevel = mixingLevel;
+
+  /*dependent*/
+  if (pSelectionData->pInst->dependsOnDrcSetPresent) {
+    int dependsOnDrcSetID = pSelectionData->pInst->dependsOnDrcSet;
+
+    for (i = 0; i < hUniDrcConfig->drcInstructionsCountInclVirtual; i++) {
+      if (hUniDrcConfig->drcInstructionsUniDrc[i].drcSetId ==
+          dependsOnDrcSetID) {
+        hSelProcOutput->selectedDrcSetIds[hSelProcOutput->numSelectedDrcSets] =
+            hUniDrcConfig->drcInstructionsUniDrc[i].drcSetId;
+        hSelProcOutput->selectedDownmixIds[hSelProcOutput->numSelectedDrcSets] =
+            hUniDrcConfig->drcInstructionsUniDrc[i].drcApplyToDownmix == 1
+                ? hUniDrcConfig->drcInstructionsUniDrc[i].downmixId[0]
+                : 0;
+        hSelProcOutput->numSelectedDrcSets++;
+        hasDependend = 1;
+        break;
+      }
+    }
+  }
+
+  /* fading */
+  if (hSelProcInput->albumMode == 0) {
+    for (i = 0; i < hUniDrcConfig->drcInstructionsUniDrcCount; i++) {
+      DRC_INSTRUCTIONS_UNI_DRC* pInst =
+          &(hUniDrcConfig->drcInstructionsUniDrc[i]);
+
+      if (pInst->drcSetEffect & EB_FADE) {
+        if (pInst->downmixId[0] == DOWNMIX_ID_ANY_DOWNMIX) {
+          hSelProcOutput->numSelectedDrcSets = hasDependend + 1;
+          hSelProcOutput
+              ->selectedDrcSetIds[hSelProcOutput->numSelectedDrcSets] =
+              hUniDrcConfig->drcInstructionsUniDrc[i].drcSetId;
+          hSelProcOutput
+              ->selectedDownmixIds[hSelProcOutput->numSelectedDrcSets] =
+              hUniDrcConfig->drcInstructionsUniDrc[i].drcApplyToDownmix == 1
+                  ? hUniDrcConfig->drcInstructionsUniDrc[i].downmixId[0]
+                  : 0;
+          hSelProcOutput->numSelectedDrcSets++;
+          hasFading = 1;
+
+        } else {
+          retVal = DRCDEC_SELECTION_PROCESS_NOT_OK;
+          if (retVal) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+        }
+      }
+    }
+  }
+
+  /* ducking */
+  for (i = 0; i < hUniDrcConfig->drcInstructionsUniDrcCount; i++) {
+    DRC_INSTRUCTIONS_UNI_DRC* pInst =
+        &(hUniDrcConfig->drcInstructionsUniDrc[i]);
+
+    if (pInst->drcSetEffect & (EB_DUCK_OTHER | EB_DUCK_SELF)) {
+      for (j = 0; j < pInst->downmixIdCount; j++) {
+        if (pInst->downmixId[j] == hSelProcOutput->activeDownmixId) {
+          hSelProcOutput->numSelectedDrcSets =
+              hasDependend + 1; /* ducking overrides fading */
+
+          hSelProcOutput
+              ->selectedDrcSetIds[hSelProcOutput->numSelectedDrcSets] =
+              hUniDrcConfig->drcInstructionsUniDrc[i].drcSetId;
+          /* force ducking DRC set to be processed on base layout */
+          hSelProcOutput
+              ->selectedDownmixIds[hSelProcOutput->numSelectedDrcSets] = 0;
+          hSelProcOutput->numSelectedDrcSets++;
+          hasDucking = 1;
+        }
+      }
+    }
+  }
+
+  /* repeat for DOWNMIX_ID_BASE_LAYOUT if no ducking found*/
+
+  if (!hasDucking) {
+    for (i = 0; i < hUniDrcConfig->drcInstructionsUniDrcCount; i++) {
+      DRC_INSTRUCTIONS_UNI_DRC* pInst =
+          &(hUniDrcConfig->drcInstructionsUniDrc[i]);
+
+      if (pInst->drcSetEffect & (EB_DUCK_OTHER | EB_DUCK_SELF)) {
+        for (j = 0; j < pInst->downmixIdCount; j++) {
+          if (pInst->downmixId[j] == DOWNMIX_ID_BASE_LAYOUT) {
+            hSelProcOutput->numSelectedDrcSets = hasDependend + hasFading + 1;
+            hSelProcOutput
+                ->selectedDrcSetIds[hSelProcOutput->numSelectedDrcSets] =
+                hUniDrcConfig->drcInstructionsUniDrc[i].drcSetId;
+            /* force ducking DRC set to be processed on base layout */
+            hSelProcOutput
+                ->selectedDownmixIds[hSelProcOutput->numSelectedDrcSets] = 0;
+            hSelProcOutput->numSelectedDrcSets++;
+          }
+        }
+      }
+    }
+  }
+
+  if (hSelProcOutput->numSelectedDrcSets > 3) {
+    /* maximum permitted number of applied DRC sets is 3, see section 6.3.5 of
+     * ISO/IEC 23003-4 */
+    hSelProcOutput->numSelectedDrcSets = 0;
+    return DRCDEC_SELECTION_PROCESS_NOT_OK;
+  }
+
+  /* sorting: Ducking/Fading -> Dependent -> Selected */
+  if (hSelProcOutput->numSelectedDrcSets == 3) {
+    selectedDrcSetIds = hSelProcOutput->selectedDrcSetIds[0];
+    selectedDownmixIds = hSelProcOutput->selectedDownmixIds[0];
+    hSelProcOutput->selectedDrcSetIds[0] = hSelProcOutput->selectedDrcSetIds[2];
+    hSelProcOutput->selectedDownmixIds[0] =
+        hSelProcOutput->selectedDownmixIds[2];
+    hSelProcOutput->selectedDrcSetIds[2] = selectedDrcSetIds;
+    hSelProcOutput->selectedDownmixIds[2] = selectedDownmixIds;
+  } else if (hSelProcOutput->numSelectedDrcSets == 2) {
+    selectedDrcSetIds = hSelProcOutput->selectedDrcSetIds[0];
+    selectedDownmixIds = hSelProcOutput->selectedDownmixIds[0];
+    hSelProcOutput->selectedDrcSetIds[0] = hSelProcOutput->selectedDrcSetIds[1];
+    hSelProcOutput->selectedDownmixIds[0] =
+        hSelProcOutput->selectedDownmixIds[1];
+    hSelProcOutput->selectedDrcSetIds[1] = selectedDrcSetIds;
+    hSelProcOutput->selectedDownmixIds[1] = selectedDownmixIds;
+  }
+
+  return retVal;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _selectDownmixMatrix(
+    HANDLE_SEL_PROC_OUTPUT hSelProcOutput,
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig) {
+  int i;
+  hSelProcOutput->baseChannelCount =
+      hUniDrcConfig->channelLayout.baseChannelCount;
+  hSelProcOutput->targetChannelCount =
+      hUniDrcConfig->channelLayout.baseChannelCount;
+  hSelProcOutput->targetLayout = -1;
+  hSelProcOutput->downmixMatrixPresent = 0;
+
+  if (hSelProcOutput->activeDownmixId != 0) {
+    for (i = 0; i < hUniDrcConfig->downmixInstructionsCount; i++) {
+      DOWNMIX_INSTRUCTIONS* pDown = &(hUniDrcConfig->downmixInstructions[i]);
+
+      if (hSelProcOutput->activeDownmixId == pDown->downmixId) {
+        hSelProcOutput->targetChannelCount = pDown->targetChannelCount;
+        hSelProcOutput->targetLayout = pDown->targetLayout;
+
+        if (pDown->downmixCoefficientsPresent) {
+          int j, k;
+          FIXP_DBL downmixOffset = getDownmixOffset(
+              pDown, hSelProcOutput->baseChannelCount); /* e = 1 */
+
+          for (j = 0; j < hSelProcOutput->baseChannelCount; j++) {
+            for (k = 0; k < hSelProcOutput->targetChannelCount; k++) {
+              hSelProcOutput->downmixMatrix[j][k] =
+                  fMultDiv2(
+                      downmixOffset,
+                      pDown->downmixCoefficient[j + k * hSelProcOutput
+                                                            ->baseChannelCount])
+                  << 2;
+            }
+          }
+
+          hSelProcOutput->downmixMatrixPresent = 1;
+        }
+        break;
+      }
+    }
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _drcSetPreSelection(
+    SEL_PROC_INPUT* hSelProcInput, HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet,
+    DRCDEC_SELECTION** ppCandidatesPotential,
+    DRCDEC_SELECTION** ppCandidatesSelected, SEL_PROC_CODEC_MODE codecMode) {
+  DRCDEC_SELECTION_PROCESS_RETURN retVal = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+  int i, j;
+
+  for (i = 0; i < hSelProcInput->numDownmixIdRequests; i++) {
+    for (j = 0; j < hUniDrcConfig->drcInstructionsCountInclVirtual; j++) {
+      DRC_INSTRUCTIONS_UNI_DRC* pDrcInstruction =
+          &(hUniDrcConfig->drcInstructionsUniDrc[j]);
+      retVal = _drcSetPreSelectionSingleInstruction(
+          hSelProcInput, i, hUniDrcConfig, hLoudnessInfoSet, pDrcInstruction,
+          *ppCandidatesPotential, *ppCandidatesSelected, codecMode);
+      if (retVal) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+    }
+  }
+
+  retVal = _preSelectionRequirement9(hSelProcInput, *ppCandidatesPotential,
+                                     *ppCandidatesSelected);
+  if (retVal) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+  if (_drcdec_selection_getNumber(*ppCandidatesSelected) == 0) {
+    retVal = _drcSetSelectionAddCandidates(
+        hSelProcInput, *ppCandidatesPotential, *ppCandidatesSelected);
+    if (retVal) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+  }
+
+  return retVal;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _drcSetRequestSelection(
+    SEL_PROC_INPUT* hSelProcInput, HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet,
+    DRCDEC_SELECTION** ppCandidatesPotential,
+    DRCDEC_SELECTION** ppCandidatesSelected) {
+  DRCDEC_SELECTION_PROCESS_RETURN retVal;
+  int i;
+
+  if (_drcdec_selection_getNumber(*ppCandidatesPotential) == 0) {
+    retVal = DRCDEC_SELECTION_PROCESS_NOT_OK;
+    if (retVal) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+  }
+
+  if (hSelProcInput->dynamicRangeControlOn) {
+    if (hSelProcInput->numDrcFeatureRequests == 0) {
+      retVal = _selectDrcSetEffectNone(hUniDrcConfig, *ppCandidatesPotential,
+                                       *ppCandidatesSelected);
+      if (retVal) return (retVal);
+
+      if (_drcdec_selection_getNumber(*ppCandidatesSelected) == 0) {
+        DRC_FEATURE_REQUEST fallbackRequest;
+        fallbackRequest.drcEffectType.numRequests = 5;
+        fallbackRequest.drcEffectType.numRequestsDesired = 5;
+        fallbackRequest.drcEffectType.request[0] = DETR_GENERAL_COMPR;
+        fallbackRequest.drcEffectType.request[1] = DETR_NIGHT;
+        fallbackRequest.drcEffectType.request[2] = DETR_NOISY;
+        fallbackRequest.drcEffectType.request[3] = DETR_LIMITED;
+        fallbackRequest.drcEffectType.request[4] = DETR_LOWLEVEL;
+
+        retVal = _selectEffectTypeFeature(hUniDrcConfig, fallbackRequest,
+                                          ppCandidatesPotential,
+                                          ppCandidatesSelected);
+        if (retVal) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+      }
+
+      _swapSelectionAndClear(ppCandidatesPotential, ppCandidatesSelected);
+    } else {
+      for (i = 0; i < hSelProcInput->numDrcFeatureRequests; i++) {
+        if (hSelProcInput->drcFeatureRequestType[i] == DFRT_EFFECT_TYPE) {
+          retVal = _selectEffectTypeFeature(
+              hUniDrcConfig, hSelProcInput->drcFeatureRequest[i],
+              ppCandidatesPotential, ppCandidatesSelected);
+
+          _swapSelectionAndClear(ppCandidatesPotential, ppCandidatesSelected);
+          if (retVal) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+        }
+
+        else if (hSelProcInput->drcFeatureRequestType[i] ==
+                 DFRT_DYNAMIC_RANGE) {
+          retVal = _selectDynamicRange(
+              hUniDrcConfig, hLoudnessInfoSet,
+              hSelProcInput->drcFeatureRequest[i],
+              hSelProcInput->downmixIdRequested, hSelProcInput->albumMode,
+              *ppCandidatesPotential, *ppCandidatesSelected);
+
+          if (_drcdec_selection_getNumber(*ppCandidatesSelected) > 0) {
+            _swapSelectionAndClear(ppCandidatesPotential, ppCandidatesSelected);
+          }
+          if (retVal) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+        } else if (hSelProcInput->drcFeatureRequestType[i] ==
+                   DFRT_DRC_CHARACTERISTIC) {
+          retVal = _selectDrcCharacteristic(
+              hUniDrcConfig,
+              hSelProcInput->drcFeatureRequest[i].drcCharacteristic,
+              ppCandidatesPotential, ppCandidatesSelected);
+
+          if (_drcdec_selection_getNumber(*ppCandidatesSelected) > 0) {
+            _swapSelectionAndClear(ppCandidatesPotential, ppCandidatesSelected);
+          }
+          if (retVal) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+        }
+      }
+    }
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+/*******************************************/
+static DRCDEC_SELECTION_PROCESS_RETURN _dynamicRangeMeasurement(
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet, DRC_INSTRUCTIONS_UNI_DRC* pInst,
+    UCHAR downmixIdRequested,
+    DYN_RANGE_MEASUREMENT_REQUEST_TYPE dynamicRangeMeasurementType,
+    int albumMode, int* pPeakToAveragePresent, FIXP_DBL* pPeakToAverage) {
+  int i;
+  DRCDEC_SELECTION_PROCESS_RETURN retVal = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+  int drcSetId = fMax(0, pInst->drcSetId);
+
+  *pPeakToAveragePresent = 0;
+
+  if (albumMode) {
+    for (i = 0; i < hLoudnessInfoSet->loudnessInfoAlbumCount; i++) {
+      LOUDNESS_INFO* pLoudnessInfo = &(hLoudnessInfoSet->loudnessInfoAlbum[i]);
+
+      if (drcSetId == pLoudnessInfo->drcSetId) {
+        if (downmixIdRequested == pLoudnessInfo->downmixId) {
+          retVal = _extractLoudnessPeakToAverageValue(
+              pLoudnessInfo, dynamicRangeMeasurementType, pPeakToAveragePresent,
+              pPeakToAverage);
+          if (retVal) return (retVal);
+        }
+      }
+    }
+  }
+
+  if (*pPeakToAveragePresent == 0) {
+    for (i = 0; i < hLoudnessInfoSet->loudnessInfoCount; i++) {
+      LOUDNESS_INFO* pLoudnessInfo = &(hLoudnessInfoSet->loudnessInfo[i]);
+
+      if (drcSetId == pLoudnessInfo->drcSetId) {
+        if (downmixIdRequested == pLoudnessInfo->downmixId) {
+          retVal = _extractLoudnessPeakToAverageValue(
+              pLoudnessInfo, dynamicRangeMeasurementType, pPeakToAveragePresent,
+              pPeakToAverage);
+          if (retVal) return (retVal);
+        }
+      }
+    }
+  }
+
+  return retVal;
+}
+/*******************************************/
+
+static DRCDEC_SELECTION_DATA* _drcdec_selection_addNew(
+    DRCDEC_SELECTION* pSelection) {
+  if (pSelection->numData < (12 + 1 + 6)) {
+    DRCDEC_SELECTION_DATA* pData = &(pSelection->data[pSelection->numData]);
+    FDKmemset(pData, 0, sizeof(DRCDEC_SELECTION_DATA));
+    pSelection->numData++;
+
+    return pData;
+  } else {
+    return NULL;
+  }
+}
+
+static DRCDEC_SELECTION_DATA* _drcdec_selection_add(
+    DRCDEC_SELECTION* pSelection, DRCDEC_SELECTION_DATA* pDataIn) {
+  if (pSelection->numData < (12 + 1 + 6)) {
+    DRCDEC_SELECTION_DATA* pData = &(pSelection->data[pSelection->numData]);
+    FDKmemcpy(pData, pDataIn, sizeof(DRCDEC_SELECTION_DATA));
+    pSelection->numData++;
+    return pData;
+  } else {
+    return NULL;
+  }
+}
+
+static int _drcdec_selection_clear(DRCDEC_SELECTION* pSelection) {
+  return pSelection->numData = 0;
+}
+
+static int _drcdec_selection_getNumber(DRCDEC_SELECTION* pSelection) {
+  return pSelection->numData;
+}
+
+static int _drcdec_selection_setNumber(DRCDEC_SELECTION* pSelection, int num) {
+  if (num >= 0 && num < pSelection->numData) {
+    return pSelection->numData = num;
+  } else {
+    return pSelection->numData;
+  }
+}
+
+static DRCDEC_SELECTION_DATA* _drcdec_selection_getAt(
+    DRCDEC_SELECTION* pSelection, int at) {
+  if (at >= 0 && at < (12 + 1 + 6)) {
+    return &(pSelection->data[at]);
+  } else {
+    return NULL;
+  }
+}
+
+static int _swapSelectionAndClear(DRCDEC_SELECTION** ppCandidatesPotential,
+                                  DRCDEC_SELECTION** ppCandidatesSelected) {
+  DRCDEC_SELECTION* pTmp = *ppCandidatesPotential;
+  *ppCandidatesPotential = *ppCandidatesSelected;
+  *ppCandidatesSelected = pTmp;
+  _drcdec_selection_clear(*ppCandidatesSelected);
+  return 0;
+}
+
+static int _swapSelection(DRCDEC_SELECTION** ppCandidatesPotential,
+                          DRCDEC_SELECTION** ppCandidatesSelected) {
+  DRCDEC_SELECTION* pTmp = *ppCandidatesPotential;
+  *ppCandidatesPotential = *ppCandidatesSelected;
+  *ppCandidatesSelected = pTmp;
+  return 0;
+}
+
+/*******************************************/
+
+static LOUDNESS_INFO* _getLoudnessInfoStructure(
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet, int drcSetId, int downmixId,
+    int albumMode) {
+  int i, j;
+  int count;
+
+  LOUDNESS_INFO* pLoudnessInfo = NULL;
+
+  if (albumMode) {
+    count = hLoudnessInfoSet->loudnessInfoAlbumCount;
+    pLoudnessInfo = hLoudnessInfoSet->loudnessInfoAlbum;
+  } else {
+    count = hLoudnessInfoSet->loudnessInfoCount;
+    pLoudnessInfo = hLoudnessInfoSet->loudnessInfo;
+  }
+
+  for (i = 0; i < count; i++) {
+    if ((pLoudnessInfo[i].drcSetId == drcSetId) &&
+        (pLoudnessInfo[i].downmixId == downmixId)) {
+      for (j = 0; j < pLoudnessInfo[i].measurementCount; j++) {
+        if ((pLoudnessInfo[i].loudnessMeasurement[j].methodDefinition == 1) ||
+            (pLoudnessInfo[i].loudnessMeasurement[j].methodDefinition == 2)) {
+          return &pLoudnessInfo[i];
+        }
+      }
+    }
+  }
+
+  return NULL;
+}
+
+static LOUDNESS_INFO* _getApplicableLoudnessInfoStructure(
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet, int drcSetId,
+    int downmixIdRequested, int albumMode) {
+  LOUDNESS_INFO* pLoudnessInfo = NULL;
+
+  /* default value */
+  pLoudnessInfo = _getLoudnessInfoStructure(hLoudnessInfoSet, drcSetId,
+                                            downmixIdRequested, albumMode);
+
+  /* fallback values */
+  if (pLoudnessInfo == NULL) {
+    pLoudnessInfo =
+        _getLoudnessInfoStructure(hLoudnessInfoSet, drcSetId, 0x7F, albumMode);
+  }
+
+  if (pLoudnessInfo == NULL) {
+    pLoudnessInfo = _getLoudnessInfoStructure(hLoudnessInfoSet, 0x3F,
+                                              downmixIdRequested, albumMode);
+  }
+
+  if (pLoudnessInfo == NULL) {
+    pLoudnessInfo = _getLoudnessInfoStructure(hLoudnessInfoSet, 0,
+                                              downmixIdRequested, albumMode);
+  }
+
+  if (pLoudnessInfo == NULL) {
+    pLoudnessInfo =
+        _getLoudnessInfoStructure(hLoudnessInfoSet, 0x3F, 0x7F, albumMode);
+  }
+
+  if (pLoudnessInfo == NULL) {
+    pLoudnessInfo =
+        _getLoudnessInfoStructure(hLoudnessInfoSet, 0, 0x7F, albumMode);
+  }
+
+  if (pLoudnessInfo == NULL) {
+    pLoudnessInfo =
+        _getLoudnessInfoStructure(hLoudnessInfoSet, drcSetId, 0, albumMode);
+  }
+
+  if (pLoudnessInfo == NULL) {
+    pLoudnessInfo =
+        _getLoudnessInfoStructure(hLoudnessInfoSet, 0x3F, 0, albumMode);
+  }
+
+  if (pLoudnessInfo == NULL) {
+    pLoudnessInfo =
+        _getLoudnessInfoStructure(hLoudnessInfoSet, 0, 0, albumMode);
+  }
+
+  return pLoudnessInfo;
+}
+
+/*******************************************/
+
+typedef struct {
+  FIXP_DBL value;
+  int order;
+} VALUE_ORDER;
+
+void _initValueOrder(VALUE_ORDER* pValue) {
+  pValue->value = (FIXP_DBL)0;
+  pValue->order = -1;
+}
+
+enum {
+  MS_BONUS0 = 0,
+  MS_BONUS1770,
+  MS_BONUSUSER,
+  MS_BONUSEXPERT,
+  MS_RESA,
+  MS_RESB,
+  MS_RESC,
+  MS_RESD,
+  MS_RESE,
+  MS_PROGRAMLOUDNESS,
+  MS_PEAKLOUDNESS
+};
+
+static DRCDEC_SELECTION_PROCESS_RETURN _getMethodValue(
+    VALUE_ORDER* pValueOrder, FIXP_DBL value, int measurementSystem,
+    int measurementSystemRequested) {
+  const int rows = 11;
+  const int columns = 12;
+  const int pOrdering[rows][columns] = {
+      {0, 0, 8, 0, 1, 3, 0, 5, 6, 7, 4, 2}, /* default = bonus1770 */
+      {0, 0, 8, 0, 1, 3, 0, 5, 6, 7, 4, 2}, /* bonus1770 */
+      {0, 0, 1, 0, 8, 5, 0, 2, 3, 4, 6, 7}, /* bonusUser */
+      {0, 0, 3, 0, 1, 8, 0, 4, 5, 6, 7, 2}, /* bonusExpert */
+      {0, 0, 5, 0, 1, 3, 0, 8, 6, 7, 4, 2}, /* ResA */
+      {0, 0, 5, 0, 1, 3, 0, 6, 8, 7, 4, 2}, /* ResB */
+      {0, 0, 5, 0, 1, 3, 0, 6, 7, 8, 4, 2}, /* ResC */
+      {0, 0, 3, 0, 1, 7, 0, 4, 5, 6, 8, 2}, /* ResD */
+      {0, 0, 1, 0, 7, 5, 0, 2, 3, 4, 6, 8}, /* ResE */
+      {0, 0, 1, 0, 0, 0, 0, 2, 3, 4, 0, 0}, /* ProgramLoudness */
+      {0, 7, 0, 0, 0, 0, 6, 5, 4, 3, 2, 1}  /* PeakLoudness */
+  };
+
+  if (measurementSystemRequested < 0 || measurementSystemRequested >= rows ||
+      measurementSystem < 0 || measurementSystem >= columns) {
+    return DRCDEC_SELECTION_PROCESS_NOT_OK;
+  }
+
+  if (pOrdering[measurementSystemRequested][measurementSystem] >
+      pValueOrder->order) {
+    pValueOrder->order =
+        pOrdering[measurementSystemRequested][measurementSystem];
+    pValueOrder->value = value;
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+/*******************************************/
+
+static DRCDEC_SELECTION_PROCESS_RETURN _getLoudness(
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet, int albumMode,
+    METHOD_DEFINITION_REQUEST measurementMethodRequested,
+    MEASUREMENT_SYSTEM_REQUEST measurementSystemRequested,
+    FIXP_DBL targetLoudness, /* e = 7 */
+    int drcSetId, int downmixIdRequested,
+    FIXP_DBL* pLoudnessNormalizationGain, /* e = 7 */
+    FIXP_DBL* pLoudness)                  /* e = 7 */
+{
+  int index;
+
+  LOUDNESS_INFO* pLoudnessInfo = NULL;
+  VALUE_ORDER valueOrder;
+
+  /* map MDR_DEFAULT to MDR_PROGRAM_LOUDNESS */
+  METHOD_DEFINITION_REQUEST requestedMethodDefinition =
+      measurementMethodRequested < MDR_ANCHOR_LOUDNESS ? MDR_PROGRAM_LOUDNESS
+                                                       : MDR_ANCHOR_LOUDNESS;
+
+  if (measurementMethodRequested > MDR_ANCHOR_LOUDNESS) {
+    return DRCDEC_SELECTION_PROCESS_NOT_OK;
+  }
+
+  _initValueOrder(&valueOrder);
+
+  *pLoudness = UNDEFINED_LOUDNESS_VALUE;
+  *pLoudnessNormalizationGain = (FIXP_DBL)0;
+
+  if (drcSetId < 0) {
+    drcSetId = 0;
+  }
+
+  pLoudnessInfo = _getApplicableLoudnessInfoStructure(
+      hLoudnessInfoSet, drcSetId, downmixIdRequested, albumMode);
+
+  if (albumMode && (pLoudnessInfo == NULL)) {
+    pLoudnessInfo = _getApplicableLoudnessInfoStructure(
+        hLoudnessInfoSet, drcSetId, downmixIdRequested, 0);
+  }
+
+  if (pLoudnessInfo == NULL) {
+    return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+  }
+
+  index = -1;
+
+  do {
+    index = _findMethodDefinition(pLoudnessInfo, requestedMethodDefinition,
+                                  index + 1);
+
+    if (index >= 0) {
+      _getMethodValue(
+          &valueOrder, pLoudnessInfo->loudnessMeasurement[index].methodValue,
+          pLoudnessInfo->loudnessMeasurement[index].measurementSystem,
+          measurementSystemRequested);
+    }
+  } while (index >= 0);
+
+  /* repeat with other method definition */
+  if (valueOrder.order == -1) {
+    index = -1;
+
+    do {
+      index = _findMethodDefinition(
+          pLoudnessInfo,
+          requestedMethodDefinition == MDR_PROGRAM_LOUDNESS
+              ? MDR_ANCHOR_LOUDNESS
+              : MDR_PROGRAM_LOUDNESS,
+          index + 1);
+
+      if (index >= 0) {
+        _getMethodValue(
+            &valueOrder, pLoudnessInfo->loudnessMeasurement[index].methodValue,
+            pLoudnessInfo->loudnessMeasurement[index].measurementSystem,
+            measurementSystemRequested);
+      }
+    } while (index >= 0);
+  }
+
+  if (valueOrder.order == -1) {
+    return DRCDEC_SELECTION_PROCESS_NOT_OK;
+  } else {
+    *pLoudnessNormalizationGain = targetLoudness - valueOrder.value;
+    *pLoudness = valueOrder.value;
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+/*******************************************/
+
+static int _truePeakLevelIsPresent(HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet,
+                                   int drcSetId, int downmixId, int albumMode) {
+  int i;
+  int count;
+  LOUDNESS_INFO* pLoudnessInfo = NULL;
+
+  if (albumMode) {
+    count = hLoudnessInfoSet->loudnessInfoAlbumCount;
+    pLoudnessInfo = hLoudnessInfoSet->loudnessInfoAlbum;
+  } else {
+    count = hLoudnessInfoSet->loudnessInfoCount;
+    pLoudnessInfo = hLoudnessInfoSet->loudnessInfo;
+  }
+
+  for (i = 0; i < count; i++) {
+    if ((pLoudnessInfo[i].drcSetId == drcSetId) &&
+        (pLoudnessInfo[i].downmixId == downmixId)) {
+      if (pLoudnessInfo[i].truePeakLevelPresent) return 1;
+    }
+  }
+
+  return 0;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _getTruePeakLevel(
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet, int drcSetId, int downmixId,
+    int albumMode, FIXP_DBL* pTruePeakLevel) {
+  int i;
+  int count;
+  LOUDNESS_INFO* pLoudnessInfo = NULL;
+
+  if (albumMode) {
+    count = hLoudnessInfoSet->loudnessInfoAlbumCount;
+    pLoudnessInfo = hLoudnessInfoSet->loudnessInfoAlbum;
+  } else {
+    count = hLoudnessInfoSet->loudnessInfoCount;
+    pLoudnessInfo = hLoudnessInfoSet->loudnessInfo;
+  }
+
+  for (i = 0; i < count; i++) {
+    if ((pLoudnessInfo[i].drcSetId == drcSetId) &&
+        (pLoudnessInfo[i].downmixId == downmixId)) {
+      if (pLoudnessInfo[i].truePeakLevelPresent) {
+        *pTruePeakLevel = pLoudnessInfo[i].truePeakLevel;
+        return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+      }
+    }
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NOT_OK;
+}
+
+static int _samplePeakLevelIsPresent(HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet,
+                                     int drcSetId, int downmixId,
+                                     int albumMode) {
+  int i;
+  int count;
+  LOUDNESS_INFO* pLoudnessInfo = NULL;
+
+  if (albumMode) {
+    count = hLoudnessInfoSet->loudnessInfoAlbumCount;
+    pLoudnessInfo = hLoudnessInfoSet->loudnessInfoAlbum;
+  } else {
+    count = hLoudnessInfoSet->loudnessInfoCount;
+    pLoudnessInfo = hLoudnessInfoSet->loudnessInfo;
+  }
+
+  for (i = 0; i < count; i++) {
+    if ((pLoudnessInfo[i].drcSetId == drcSetId) &&
+        (pLoudnessInfo[i].downmixId == downmixId)) {
+      if (pLoudnessInfo[i].samplePeakLevelPresent) return 1;
+    }
+  }
+
+  return 0;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _getSamplePeakLevel(
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet, int drcSetId, int downmixId,
+    int albumMode, FIXP_DBL* pSamplePeakLevel /* e = 7 */
+) {
+  int i;
+  int count;
+  LOUDNESS_INFO* pLoudnessInfo = NULL;
+
+  if (albumMode) {
+    count = hLoudnessInfoSet->loudnessInfoAlbumCount;
+    pLoudnessInfo = hLoudnessInfoSet->loudnessInfoAlbum;
+  } else {
+    count = hLoudnessInfoSet->loudnessInfoCount;
+    pLoudnessInfo = hLoudnessInfoSet->loudnessInfo;
+  }
+
+  for (i = 0; i < count; i++) {
+    if ((pLoudnessInfo[i].drcSetId == drcSetId) &&
+        (pLoudnessInfo[i].downmixId == downmixId)) {
+      if (pLoudnessInfo[i].samplePeakLevelPresent) {
+        *pSamplePeakLevel = pLoudnessInfo[i].samplePeakLevel;
+        return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+      }
+    }
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NOT_OK;
+}
+
+static int _limiterPeakTargetIsPresent(
+    DRC_INSTRUCTIONS_UNI_DRC* pDrcInstruction, int drcSetId, int downmixId) {
+  int i;
+
+  if (pDrcInstruction->limiterPeakTargetPresent) {
+    if ((pDrcInstruction->downmixId[0] == downmixId) ||
+        (pDrcInstruction->downmixId[0] == 0x7F)) {
+      return 1;
+    }
+
+    for (i = 0; i < pDrcInstruction->downmixIdCount; i++) {
+      if (pDrcInstruction->downmixId[i] == downmixId) {
+        return 1;
+      }
+    }
+  }
+
+  return 0;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _getLimiterPeakTarget(
+    DRC_INSTRUCTIONS_UNI_DRC* pDrcInstruction, int drcSetId, int downmixId,
+    FIXP_DBL* pLimiterPeakTarget) {
+  int i;
+
+  if (pDrcInstruction->limiterPeakTargetPresent) {
+    if ((pDrcInstruction->downmixId[0] == downmixId) ||
+        (pDrcInstruction->downmixId[0] == 0x7F)) {
+      *pLimiterPeakTarget =
+          ((FX_SGL2FX_DBL(pDrcInstruction->limiterPeakTarget) >> 2));
+      return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+    }
+
+    for (i = 0; i < pDrcInstruction->downmixIdCount; i++) {
+      if (pDrcInstruction->downmixId[i] == downmixId) {
+        *pLimiterPeakTarget =
+            ((FX_SGL2FX_DBL(pDrcInstruction->limiterPeakTarget) >> 2));
+        return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+      }
+    }
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NOT_OK;
+}
+
+static int _downmixCoefficientsArePresent(HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+                                          int downmixId, int* pIndex) {
+  int i;
+  *pIndex = -1;
+
+  for (i = 0; i < hUniDrcConfig->downmixInstructionsCount; i++) {
+    if (hUniDrcConfig->downmixInstructions[i].downmixId == downmixId) {
+      if (hUniDrcConfig->downmixInstructions[i].downmixCoefficientsPresent) {
+        *pIndex = i;
+        return 1;
+      }
+    }
+  }
+
+  return 0;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _getSignalPeakLevel(
+    HANDLE_SEL_PROC_INPUT hSelProcInput, HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet, DRC_INSTRUCTIONS_UNI_DRC* pInst,
+    int downmixIdRequested, int* explicitPeakInformationPresent,
+    FIXP_DBL* signalPeakLevelOut, /* e = 7 */
+    SEL_PROC_CODEC_MODE codecMode
+
+) {
+  DRCDEC_SELECTION_PROCESS_RETURN retVal = DRCDEC_SELECTION_PROCESS_NO_ERROR;
+
+  int albumMode = hSelProcInput->albumMode;
+
+  FIXP_DBL signalPeakLevelTmp = (FIXP_DBL)0;
+  FIXP_DBL signalPeakLevel = FIXP_DBL(0);
+
+  int dmxId = downmixIdRequested;
+
+  int drcSetId = pInst->drcSetId;
+
+  if (drcSetId < 0) {
+    drcSetId = 0;
+  }
+
+  *explicitPeakInformationPresent = 1;
+
+  if (_truePeakLevelIsPresent(hLoudnessInfoSet, drcSetId, dmxId, albumMode)) {
+    retVal = _getTruePeakLevel(hLoudnessInfoSet, drcSetId, dmxId, albumMode,
+                               &signalPeakLevel);
+    if (retVal) return (retVal);
+  } else if (_samplePeakLevelIsPresent(hLoudnessInfoSet, drcSetId, dmxId,
+                                       albumMode)) {
+    retVal = _getSamplePeakLevel(hLoudnessInfoSet, drcSetId, dmxId, albumMode,
+                                 &signalPeakLevel);
+    if (retVal) return (retVal);
+  } else if (_truePeakLevelIsPresent(hLoudnessInfoSet, 0x3F, dmxId,
+                                     albumMode)) {
+    retVal = _getTruePeakLevel(hLoudnessInfoSet, 0x3F, dmxId, albumMode,
+                               &signalPeakLevel);
+    if (retVal) return (retVal);
+  } else if (_samplePeakLevelIsPresent(hLoudnessInfoSet, 0x3F, dmxId,
+                                       albumMode)) {
+    retVal = _getSamplePeakLevel(hLoudnessInfoSet, 0x3F, dmxId, albumMode,
+                                 &signalPeakLevel);
+    if (retVal) return (retVal);
+  } else if (_limiterPeakTargetIsPresent(pInst, drcSetId, dmxId)) {
+    retVal = _getLimiterPeakTarget(pInst, drcSetId, dmxId, &signalPeakLevel);
+    if (retVal) return (retVal);
+  } else if (dmxId != 0) {
+    int downmixInstructionIndex = 0;
+    FIXP_DBL downmixPeakLevelDB = 0;
+
+    *explicitPeakInformationPresent = 0;
+
+    signalPeakLevelTmp = FIXP_DBL(0);
+
+    if (_downmixCoefficientsArePresent(hUniDrcConfig, dmxId,
+                                       &downmixInstructionIndex)) {
+      FIXP_DBL dB_m;
+      int dB_e;
+      FIXP_DBL coeff;
+      FIXP_DBL sum, maxSum; /* e = 7, so it is possible to sum up up to 32
+                               downmix coefficients (with e = 2) */
+      int i, j;
+      DOWNMIX_INSTRUCTIONS* pDown =
+          &(hUniDrcConfig->downmixInstructions[downmixInstructionIndex]);
+      FIXP_DBL downmixOffset = getDownmixOffset(
+          pDown, hUniDrcConfig->channelLayout.baseChannelCount); /* e = 1 */
+      maxSum = (FIXP_DBL)0;
+
+      for (i = 0; i < pDown->targetChannelCount; i++) {
+        sum = (FIXP_DBL)0;
+        for (j = 0; j < hUniDrcConfig->channelLayout.baseChannelCount; j++) {
+          coeff = pDown->downmixCoefficient[j + i * hUniDrcConfig->channelLayout
+                                                        .baseChannelCount];
+          sum += coeff >> 5;
+        }
+        if (maxSum < sum) maxSum = sum;
+      }
+
+      maxSum = fMultDiv2(maxSum, downmixOffset) << 2;
+
+      if (maxSum == FL2FXCONST_DBL(1.0f / (float)(1 << 7))) {
+        downmixPeakLevelDB = (FIXP_DBL)0;
+      } else {
+        dB_m = lin2dB(maxSum, 7, &dB_e); /* e_maxSum = 7 */
+        downmixPeakLevelDB =
+            scaleValue(dB_m, dB_e - 7); /* e_downmixPeakLevelDB = 7 */
+      }
+    }
+
+    if (_truePeakLevelIsPresent(hLoudnessInfoSet, drcSetId, 0, albumMode)) {
+      retVal = _getTruePeakLevel(hLoudnessInfoSet, drcSetId, 0, albumMode,
+                                 &signalPeakLevelTmp);
+      if (retVal) return (retVal);
+    } else if (_samplePeakLevelIsPresent(hLoudnessInfoSet, drcSetId, 0,
+                                         albumMode)) {
+      retVal = _getSamplePeakLevel(hLoudnessInfoSet, drcSetId, 0, albumMode,
+                                   &signalPeakLevelTmp);
+      if (retVal) return (retVal);
+    } else if (_truePeakLevelIsPresent(hLoudnessInfoSet, 0x3F, 0, albumMode)) {
+      retVal = _getTruePeakLevel(hLoudnessInfoSet, 0x3F, 0, albumMode,
+                                 &signalPeakLevelTmp);
+      if (retVal) return (retVal);
+    } else if (_samplePeakLevelIsPresent(hLoudnessInfoSet, 0x3F, 0,
+                                         albumMode)) {
+      retVal = _getSamplePeakLevel(hLoudnessInfoSet, 0x3F, 0, albumMode,
+                                   &signalPeakLevelTmp);
+      if (retVal) return (retVal);
+    } else if (_limiterPeakTargetIsPresent(pInst, drcSetId, 0)) {
+      retVal = _getLimiterPeakTarget(pInst, drcSetId, 0, &signalPeakLevelTmp);
+      if (retVal) return (retVal);
+    }
+
+    signalPeakLevel = signalPeakLevelTmp + downmixPeakLevelDB;
+  } else {
+    signalPeakLevel = FIXP_DBL(0); /* worst case estimate */
+    *explicitPeakInformationPresent = FIXP_DBL(0);
+  }
+
+  *signalPeakLevelOut = signalPeakLevel;
+
+  return retVal;
+}
+
+static DRCDEC_SELECTION_PROCESS_RETURN _extractLoudnessPeakToAverageValue(
+    LOUDNESS_INFO* loudnessInfo,
+    DYN_RANGE_MEASUREMENT_REQUEST_TYPE dynamicRangeMeasurementType,
+    int* pLoudnessPeakToAverageValuePresent,
+    FIXP_DBL* pLoudnessPeakToAverageValue) {
+  int i;
+
+  VALUE_ORDER valueOrderLoudness;
+  VALUE_ORDER valueOrderPeakLoudness;
+
+  _initValueOrder(&valueOrderLoudness);
+  _initValueOrder(&valueOrderPeakLoudness);
+
+  LOUDNESS_MEASUREMENT* pLoudnessMeasure = NULL;
+
+  *pLoudnessPeakToAverageValuePresent = 0;
+
+  for (i = 0; i < loudnessInfo->measurementCount; i++) {
+    pLoudnessMeasure = &(loudnessInfo->loudnessMeasurement[i]);
+
+    if (pLoudnessMeasure->methodDefinition == MD_PROGRAM_LOUDNESS) {
+      _getMethodValue(&valueOrderLoudness, pLoudnessMeasure->methodValue,
+                      pLoudnessMeasure->measurementSystem, MS_PROGRAMLOUDNESS);
+    }
+
+    if ((dynamicRangeMeasurementType == DRMRT_SHORT_TERM_LOUDNESS_TO_AVG) &&
+        (pLoudnessMeasure->methodDefinition == MD_SHORT_TERM_LOUDNESS_MAX)) {
+      _getMethodValue(&valueOrderPeakLoudness, pLoudnessMeasure->methodValue,
+                      pLoudnessMeasure->measurementSystem, MS_PEAKLOUDNESS);
+    }
+
+    if ((dynamicRangeMeasurementType == DRMRT_MOMENTARY_LOUDNESS_TO_AVG) &&
+        (pLoudnessMeasure->methodDefinition == MD_MOMENTARY_LOUDNESS_MAX)) {
+      _getMethodValue(&valueOrderPeakLoudness, pLoudnessMeasure->methodValue,
+                      pLoudnessMeasure->measurementSystem, MS_PEAKLOUDNESS);
+    }
+
+    if ((dynamicRangeMeasurementType == DRMRT_TOP_OF_LOUDNESS_RANGE_TO_AVG) &&
+        (pLoudnessMeasure->methodDefinition == MD_MAX_OF_LOUDNESS_RANGE)) {
+      _getMethodValue(&valueOrderPeakLoudness, pLoudnessMeasure->methodValue,
+                      pLoudnessMeasure->measurementSystem, MS_PEAKLOUDNESS);
+    }
+  }
+
+  if ((valueOrderLoudness.order > -1) && (valueOrderPeakLoudness.order > -1)) {
+    *pLoudnessPeakToAverageValue =
+        valueOrderPeakLoudness.value - valueOrderLoudness.value;
+    *pLoudnessPeakToAverageValuePresent = 1;
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+/*******************************************/
+
+static DRCDEC_SELECTION_PROCESS_RETURN _selectAlbumLoudness(
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet,
+    DRCDEC_SELECTION* pCandidatesPotential,
+    DRCDEC_SELECTION* pCandidatesSelected) {
+  int i, j;
+
+  for (i = 0; i < _drcdec_selection_getNumber(pCandidatesPotential); i++) {
+    DRCDEC_SELECTION_DATA* pCandidate =
+        _drcdec_selection_getAt(pCandidatesPotential, i);
+    if (pCandidate == NULL) return DRCDEC_SELECTION_PROCESS_NOT_OK;
+
+    for (j = 0; j < hLoudnessInfoSet->loudnessInfoAlbumCount; j++) {
+      if (pCandidate->pInst->drcSetId ==
+          hLoudnessInfoSet->loudnessInfoAlbum[j].drcSetId) {
+        if (_drcdec_selection_add(pCandidatesSelected, pCandidate) == NULL)
+          return DRCDEC_SELECTION_PROCESS_NOT_OK;
+      }
+    }
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+/*******************************************/
+
+static int _findMethodDefinition(LOUDNESS_INFO* pLoudnessInfo,
+                                 int methodDefinition, int startIndex) {
+  int i;
+  int index = -1;
+
+  for (i = startIndex; i < pLoudnessInfo->measurementCount; i++) {
+    if (pLoudnessInfo->loudnessMeasurement[i].methodDefinition ==
+        methodDefinition) {
+      index = i;
+      break;
+    }
+  }
+
+  return index;
+}
+
+/*******************************************/
+
+static DRCDEC_SELECTION_PROCESS_RETURN _getMixingLevel(
+    HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet, int downmixIdRequested,
+    int drcSetIdRequested, int albumMode, FIXP_DBL* pMixingLevel) {
+  const FIXP_DBL mixingLevelDefault = FL2FXCONST_DBL(85.0f / (float)(1 << 7));
+
+  int i;
+  int count;
+
+  LOUDNESS_INFO* pLoudnessInfo = NULL;
+
+  *pMixingLevel = mixingLevelDefault;
+
+  if (drcSetIdRequested < 0) {
+    drcSetIdRequested = 0;
+  }
+
+  if (albumMode) {
+    count = hLoudnessInfoSet->loudnessInfoAlbumCount;
+    pLoudnessInfo = hLoudnessInfoSet->loudnessInfoAlbum;
+  } else {
+    count = hLoudnessInfoSet->loudnessInfoCount;
+    pLoudnessInfo = hLoudnessInfoSet->loudnessInfo;
+  }
+
+  for (i = 0; i < count; i++) {
+    if ((drcSetIdRequested == pLoudnessInfo[i].drcSetId) &&
+        ((downmixIdRequested == pLoudnessInfo[i].downmixId) ||
+         (DOWNMIX_ID_ANY_DOWNMIX == pLoudnessInfo[i].downmixId))) {
+      int index = _findMethodDefinition(&pLoudnessInfo[i], MD_MIXING_LEVEL, 0);
+
+      if (index >= 0) {
+        *pMixingLevel = pLoudnessInfo[i].loudnessMeasurement[index].methodValue;
+        break;
+      }
+    }
+  }
+
+  return DRCDEC_SELECTION_PROCESS_NO_ERROR;
+}
+
+/*******************************************/
diff --git a/libDRCdec/src/drcDec_selectionProcess.h b/libDRCdec/src/drcDec_selectionProcess.h
new file mode 100644
index 0000000..9e0e3fb
--- /dev/null
+++ b/libDRCdec/src/drcDec_selectionProcess.h
@@ -0,0 +1,217 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):   Andreas Hoelzer
+
+   Description: DRC Set Selection
+
+*******************************************************************************/
+
+#ifndef DRCDEC_SELECTIONPROCESS_H
+#define DRCDEC_SELECTIONPROCESS_H
+
+#include "drcDec_types.h"
+#include "drcDecoder.h"
+
+/* DRC set selection according to section 6.2 of ISO/IEC 23003-4 (MPEG-D DRC) */
+/* including ISO/IEC 23003-4/AMD1 (Amendment 1) */
+
+typedef struct s_drcdec_selection_process* HANDLE_DRC_SELECTION_PROCESS;
+
+typedef enum {
+  DRCDEC_SELECTION_PROCESS_NO_ERROR = 0,
+
+  DRCDEC_SELECTION_PROCESS_WARNING = -1000,
+
+  DRCDEC_SELECTION_PROCESS_NOT_OK = -2000,
+  DRCDEC_SELECTION_PROCESS_OUTOFMEMORY,
+  DRCDEC_SELECTION_PROCESS_INVALID_HANDLE,
+  DRCDEC_SELECTION_PROCESS_NOT_SUPPORTED,
+  DRCDEC_SELECTION_PROCESS_INVALID_PARAM,
+  DRCDEC_SELECTION_PROCESS_PARAM_OUT_OF_RANGE
+
+} DRCDEC_SELECTION_PROCESS_RETURN;
+
+typedef enum {
+  SEL_PROC_TEST_TIME_DOMAIN = -100,
+  SEL_PROC_TEST_QMF_DOMAIN,
+  SEL_PROC_TEST_STFT_DOMAIN,
+
+  SEL_PROC_CODEC_MODE_UNDEFINED = -1,
+  SEL_PROC_MPEG_4_AAC,
+  SEL_PROC_MPEG_D_USAC,
+  SEL_PROC_MPEG_H_3DA
+} SEL_PROC_CODEC_MODE;
+
+typedef enum {
+  /* set and get user param */
+  SEL_PROC_LOUDNESS_NORMALIZATION_ON,
+  /* get only user param */
+  SEL_PROC_DYNAMIC_RANGE_CONTROL_ON,
+  /* set only user params */
+  SEL_PROC_TARGET_LOUDNESS,
+  SEL_PROC_EFFECT_TYPE,
+  SEL_PROC_EFFECT_TYPE_FALLBACK_CODE,
+  SEL_PROC_LOUDNESS_MEASUREMENT_METHOD,
+  SEL_PROC_DOWNMIX_ID,
+  SEL_PROC_TARGET_LAYOUT,
+  SEL_PROC_TARGET_CHANNEL_COUNT,
+  SEL_PROC_BASE_CHANNEL_COUNT,
+  SEL_PROC_SAMPLE_RATE,
+  SEL_PROC_BOOST,
+  SEL_PROC_COMPRESS
+} SEL_PROC_USER_PARAM;
+
+typedef struct s_selection_process_output {
+  FIXP_DBL outputPeakLevelDb;           /* e = 7 */
+  FIXP_DBL loudnessNormalizationGainDb; /* e = 7 */
+  FIXP_DBL outputLoudness;              /* e = 7 */
+
+  UCHAR numSelectedDrcSets;
+  SCHAR selectedDrcSetIds[MAX_ACTIVE_DRCS];
+  UCHAR selectedDownmixIds[MAX_ACTIVE_DRCS];
+
+  UCHAR activeDownmixId;
+  UCHAR baseChannelCount;
+  UCHAR targetChannelCount;
+  SCHAR targetLayout;
+  UCHAR downmixMatrixPresent;
+  FIXP_DBL downmixMatrix[8][8]; /* e = 2 */
+
+  FIXP_SGL boost;    /* e = 1 */
+  FIXP_SGL compress; /* e = 1 */
+
+  FIXP_DBL mixingLevel; /* e = 7 */
+
+} SEL_PROC_OUTPUT, *HANDLE_SEL_PROC_OUTPUT;
+
+DRCDEC_SELECTION_PROCESS_RETURN
+drcDec_SelectionProcess_Create(HANDLE_DRC_SELECTION_PROCESS* phInstance);
+
+DRCDEC_SELECTION_PROCESS_RETURN
+drcDec_SelectionProcess_Delete(HANDLE_DRC_SELECTION_PROCESS* phInstance);
+
+DRCDEC_SELECTION_PROCESS_RETURN
+drcDec_SelectionProcess_Init(HANDLE_DRC_SELECTION_PROCESS hInstance);
+
+DRCDEC_SELECTION_PROCESS_RETURN
+drcDec_SelectionProcess_SetCodecMode(HANDLE_DRC_SELECTION_PROCESS hInstance,
+                                     const SEL_PROC_CODEC_MODE codecMode);
+
+DRCDEC_SELECTION_PROCESS_RETURN
+drcDec_SelectionProcess_SetParam(HANDLE_DRC_SELECTION_PROCESS hInstance,
+                                 const SEL_PROC_USER_PARAM requestType,
+                                 FIXP_DBL requestValue, int* pDiff);
+
+FIXP_DBL
+drcDec_SelectionProcess_GetParam(HANDLE_DRC_SELECTION_PROCESS hInstance,
+                                 const SEL_PROC_USER_PARAM requestType);
+
+DRCDEC_SELECTION_PROCESS_RETURN
+drcDec_SelectionProcess_SetMpeghParams(
+    HANDLE_DRC_SELECTION_PROCESS hInstance, const int numGroupIdsRequested,
+    const int* groupIdRequested, const int numGroupPresetIdsRequested,
+    const int* groupPresetIdRequested,
+    const int* numMembersGroupPresetIdsRequested,
+    const int groupPresetIdRequestedPreference, int* pDiff);
+
+DRCDEC_SELECTION_PROCESS_RETURN
+drcDec_SelectionProcess_Process(HANDLE_DRC_SELECTION_PROCESS hInstance,
+                                HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+                                HANDLE_LOUDNESS_INFO_SET hLoudnessInfoSet,
+                                HANDLE_SEL_PROC_OUTPUT hSelProcOutput);
+
+#endif
diff --git a/libDRCdec/src/drcDec_tools.cpp b/libDRCdec/src/drcDec_tools.cpp
new file mode 100644
index 0000000..9a6feb1
--- /dev/null
+++ b/libDRCdec/src/drcDec_tools.cpp
@@ -0,0 +1,371 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+#include "drcDec_types.h"
+#include "drcDec_tools.h"
+#include "fixpoint_math.h"
+#include "drcDecoder.h"
+
+int getDeltaTmin(const int sampleRate) {
+  /* half_ms = round (0.0005 * sampleRate); */
+  int half_ms = (sampleRate + 1000) / 2000;
+  int deltaTmin = 1;
+  if (sampleRate < 1000) {
+    return DE_NOT_OK;
+  }
+  while (deltaTmin <= half_ms) {
+    deltaTmin = deltaTmin << 1;
+  }
+  return deltaTmin;
+}
+
+DRC_COEFFICIENTS_UNI_DRC* selectDrcCoefficients(
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig, const int location) {
+  int n;
+  int c = -1;
+  for (n = 0; n < hUniDrcConfig->drcCoefficientsUniDrcCount; n++) {
+    if (hUniDrcConfig->drcCoefficientsUniDrc[n].drcLocation == location) {
+      c = n;
+    }
+  }
+  if (c >= 0) {
+    return &(hUniDrcConfig->drcCoefficientsUniDrc[c]);
+  }
+  return NULL; /* possible during bitstream parsing */
+}
+
+DRC_INSTRUCTIONS_UNI_DRC* selectDrcInstructions(
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig, const int drcSetId) {
+  int i;
+  for (i = 0; i < hUniDrcConfig->drcInstructionsCountInclVirtual; i++) {
+    if (hUniDrcConfig->drcInstructionsUniDrc[i].drcSetId == drcSetId) {
+      return &(hUniDrcConfig->drcInstructionsUniDrc[i]);
+    }
+  }
+  return NULL;
+}
+
+DOWNMIX_INSTRUCTIONS* selectDownmixInstructions(
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig, const int downmixId) {
+  int i;
+  for (i = 0; i < hUniDrcConfig->downmixInstructionsCount; i++) {
+    if (hUniDrcConfig->downmixInstructions[i].downmixId == downmixId) {
+      return &(hUniDrcConfig->downmixInstructions[i]);
+    }
+  }
+  return NULL;
+}
+
+DRC_ERROR
+deriveDrcChannelGroups(
+    const int drcSetEffect,                                    /* in */
+    const int channelCount,                                    /* in */
+    const SCHAR* gainSetIndex,                                 /* in */
+    const DUCKING_MODIFICATION* duckingModificationForChannel, /* in */
+    UCHAR* nDrcChannelGroups,                                  /* out */
+    SCHAR* uniqueIndex,     /* out (gainSetIndexForChannelGroup) */
+    SCHAR* groupForChannel, /* out */
+    DUCKING_MODIFICATION* duckingModificationForChannelGroup) /* out */
+{
+  int duckingSequence = -1;
+  int c, n, g, match, idx;
+  FIXP_SGL factor;
+  FIXP_SGL uniqueScaling[8];
+
+  for (g = 0; g < 8; g++) {
+    uniqueIndex[g] = -10;
+    uniqueScaling[g] = FIXP_SGL(-1.0f);
+  }
+
+  g = 0;
+
+  if (drcSetEffect & EB_DUCK_OTHER) {
+    for (c = 0; c < channelCount; c++) {
+      match = 0;
+      if (c >= 8) return DE_MEMORY_ERROR;
+      idx = gainSetIndex[c];
+      factor = duckingModificationForChannel[c].duckingScaling;
+      if (idx < 0) {
+        for (n = 0; n < g; n++) {
+          if (uniqueScaling[n] == factor) {
+            match = 1;
+            groupForChannel[c] = n;
+            break;
+          }
+        }
+        if (match == 0) {
+          if (g >= 8) return DE_MEMORY_ERROR;
+          uniqueIndex[g] = idx;
+          uniqueScaling[g] = factor;
+          groupForChannel[c] = g;
+          g++;
+        }
+      } else {
+        if ((duckingSequence > 0) && (duckingSequence != idx)) {
+          return DE_NOT_OK;
+        }
+        duckingSequence = idx;
+        groupForChannel[c] = -1;
+      }
+    }
+    if (duckingSequence == -1) {
+      return DE_NOT_OK;
+    }
+  } else if (drcSetEffect & EB_DUCK_SELF) {
+    for (c = 0; c < channelCount; c++) {
+      match = 0;
+      if (c >= 8) return DE_MEMORY_ERROR;
+      idx = gainSetIndex[c];
+      factor = duckingModificationForChannel[c].duckingScaling;
+      if (idx >= 0) {
+        for (n = 0; n < g; n++) {
+          if ((uniqueIndex[n] == idx) && (uniqueScaling[n] == factor)) {
+            match = 1;
+            groupForChannel[c] = n;
+            break;
+          }
+        }
+        if (match == 0) {
+          if (g >= 8) return DE_MEMORY_ERROR;
+          uniqueIndex[g] = idx;
+          uniqueScaling[g] = factor;
+          groupForChannel[c] = g;
+          g++;
+        }
+      } else {
+        groupForChannel[c] = -1;
+      }
+    }
+  } else { /* no ducking */
+    for (c = 0; c < channelCount; c++) {
+      if (c >= 8) return DE_MEMORY_ERROR;
+      idx = gainSetIndex[c];
+      match = 0;
+      if (idx >= 0) {
+        for (n = 0; n < g; n++) {
+          if (uniqueIndex[n] == idx) {
+            match = 1;
+            groupForChannel[c] = n;
+            break;
+          }
+        }
+        if (match == 0) {
+          if (g >= 8) return DE_MEMORY_ERROR;
+          uniqueIndex[g] = idx;
+          groupForChannel[c] = g;
+          g++;
+        }
+      } else {
+        groupForChannel[c] = -1;
+      }
+    }
+  }
+  *nDrcChannelGroups = g;
+
+  if (drcSetEffect & (EB_DUCK_OTHER | EB_DUCK_SELF)) {
+    for (g = 0; g < *nDrcChannelGroups; g++) {
+      if (drcSetEffect & EB_DUCK_OTHER) {
+        uniqueIndex[g] = duckingSequence;
+      }
+      duckingModificationForChannelGroup[g].duckingScaling = uniqueScaling[g];
+      if (uniqueScaling[g] != FL2FXCONST_SGL(1.0f / (float)(1 << 2))) {
+        duckingModificationForChannelGroup[g].duckingScalingPresent = 1;
+      } else {
+        duckingModificationForChannelGroup[g].duckingScalingPresent = 0;
+      }
+    }
+  }
+
+  return DE_OK;
+}
+
+FIXP_DBL
+dB2lin(const FIXP_DBL dB_m, const int dB_e, int* pLin_e) {
+  /* get linear value from dB.
+     return lin_val = 10^(dB_val/20) = 2^(log2(10)/20*dB_val)
+     with dB_val = dB_m *2^dB_e and lin_val = lin_m * 2^lin_e */
+  FIXP_DBL lin_m =
+      f2Pow(fMult(dB_m, FL2FXCONST_DBL(0.1660964f * (float)(1 << 2))), dB_e - 2,
+            pLin_e);
+
+  return lin_m;
+}
+
+FIXP_DBL
+lin2dB(const FIXP_DBL lin_m, const int lin_e, int* pDb_e) {
+  /* get dB value from linear value.
+     return dB_val = 20*log10(lin_val)
+     with dB_val = dB_m *2^dB_e and lin_val = lin_m * 2^lin_e */
+  FIXP_DBL dB_m;
+
+  if (lin_m == (FIXP_DBL)0) { /* return very small value representing -inf */
+    dB_m = (FIXP_DBL)MINVAL_DBL;
+    *pDb_e = DFRACT_BITS - 1;
+  } else {
+    /* 20*log10(lin_val) = 20/log2(10)*log2(lin_val) */
+    dB_m = fMultDiv2(FL2FXCONST_DBL(6.02059991f / (float)(1 << 3)),
+                     fLog2(lin_m, lin_e, pDb_e));
+    *pDb_e += 3 + 1;
+  }
+
+  return dB_m;
+}
+
+FIXP_DBL
+approxDb2lin(const FIXP_DBL dB_m, const int dB_e, int* pLin_e) {
+  /* get linear value from approximate dB.
+     return lin_val = 2^(dB_val/6)
+     with dB_val = dB_m *2^dB_e and lin_val = lin_m * 2^lin_e */
+  FIXP_DBL lin_m =
+      f2Pow(fMult(dB_m, FL2FXCONST_DBL(0.1666667f * (float)(1 << 2))), dB_e - 2,
+            pLin_e);
+
+  return lin_m;
+}
+
+int bitstreamContainsMultibandDrc(HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+                                  const int downmixId) {
+  int i, g, d, seq;
+  DRC_INSTRUCTIONS_UNI_DRC* pInst;
+  DRC_COEFFICIENTS_UNI_DRC* pCoef = NULL;
+  int isMultiband = 0;
+
+  pCoef = selectDrcCoefficients(hUniDrcConfig, LOCATION_SELECTED);
+  if (pCoef == NULL) return 0;
+
+  for (i = 0; i < hUniDrcConfig->drcInstructionsUniDrcCount; i++) {
+    pInst = &(hUniDrcConfig->drcInstructionsUniDrc[i]);
+    for (d = 0; d < pInst->downmixIdCount; d++) {
+      if (downmixId == pInst->downmixId[d]) {
+        for (g = 0; g < pInst->nDrcChannelGroups; g++) {
+          seq = pInst->gainSetIndexForChannelGroup[g];
+          if (pCoef->gainSet[seq].bandCount > 1) {
+            isMultiband = 1;
+          }
+        }
+      }
+    }
+  }
+
+  return isMultiband;
+}
+
+FIXP_DBL getDownmixOffset(DOWNMIX_INSTRUCTIONS* pDown, int baseChannelCount) {
+  FIXP_DBL downmixOffset = FL2FXCONST_DBL(1.0f / (1 << 1)); /* e = 1 */
+  if ((pDown->bsDownmixOffset == 1) || (pDown->bsDownmixOffset == 2)) {
+    int e_a, e_downmixOffset;
+    FIXP_DBL a, q;
+    if (baseChannelCount <= pDown->targetChannelCount) return downmixOffset;
+
+    q = fDivNorm((FIXP_DBL)pDown->targetChannelCount,
+                 (FIXP_DBL)baseChannelCount); /* e = 0 */
+    a = lin2dB(q, 0, &e_a);
+    if (pDown->bsDownmixOffset == 2) {
+      e_a += 1; /* a *= 2 */
+    }
+    /* a = 0.5 * round (a) */
+    a = fixp_round(a, e_a) >> 1;
+    downmixOffset = dB2lin(a, e_a, &e_downmixOffset);
+    downmixOffset = scaleValue(downmixOffset, e_downmixOffset - 1);
+  }
+  return downmixOffset;
+}
diff --git a/libDRCdec/src/drcDec_tools.h b/libDRCdec/src/drcDec_tools.h
new file mode 100644
index 0000000..77a0ab7
--- /dev/null
+++ b/libDRCdec/src/drcDec_tools.h
@@ -0,0 +1,146 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+#ifndef DRCDEC_TOOLS_H
+#define DRCDEC_TOOLS_H
+
+#include "drcDec_types.h"
+#include "drcDec_selectionProcess.h"
+
+int getDeltaTmin(const int sampleRate);
+
+DRC_COEFFICIENTS_UNI_DRC* selectDrcCoefficients(
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig, const int location);
+
+DRC_INSTRUCTIONS_UNI_DRC* selectDrcInstructions(
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig, const int drcSetId);
+
+DOWNMIX_INSTRUCTIONS* selectDownmixInstructions(
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig, const int downmixId);
+
+DRC_ERROR
+deriveDrcChannelGroups(
+    const int drcSetEffect,                                    /* in */
+    const int channelCount,                                    /* in */
+    const SCHAR* gainSetIndex,                                 /* in */
+    const DUCKING_MODIFICATION* duckingModificationForChannel, /* in */
+    UCHAR* nDrcChannelGroups,                                  /* out */
+    SCHAR* uniqueIndex,     /* out (gainSetIndexForChannelGroup) */
+    SCHAR* groupForChannel, /* out */
+    DUCKING_MODIFICATION* duckingModificationForChannelGroup); /* out */
+
+FIXP_DBL
+dB2lin(const FIXP_DBL dB_m, const int dB_e, int* pLin_e);
+
+FIXP_DBL
+lin2dB(const FIXP_DBL lin_m, const int lin_e, int* pDb_e);
+
+FIXP_DBL
+approxDb2lin(const FIXP_DBL dB_m, const int dB_e, int* pLin_e);
+
+int bitstreamContainsMultibandDrc(HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+                                  const int downmixId);
+
+FIXP_DBL
+getDownmixOffset(DOWNMIX_INSTRUCTIONS* pDown, int baseChannelCount);
+
+#endif
diff --git a/libDRCdec/src/drcDec_types.h b/libDRCdec/src/drcDec_types.h
new file mode 100644
index 0000000..28c17f3
--- /dev/null
+++ b/libDRCdec/src/drcDec_types.h
@@ -0,0 +1,428 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+#ifndef DRCDEC_TYPES_H
+#define DRCDEC_TYPES_H
+
+#include "common_fix.h"
+
+/* Data structures corresponding to static and dynamic DRC/Loudness payload
+   as defined in section 7 of MPEG-D DRC standard, ISO/IEC 23003-4 */
+
+/**************/
+/* uniDrcGain */
+/**************/
+
+typedef struct {
+  FIXP_SGL gainDb; /* e = 7 */
+  SHORT time;
+} GAIN_NODE;
+
+/* uniDrcGainExtension() (Table 56) */
+typedef struct {
+  UCHAR uniDrcGainExtType[8];
+  ULONG extBitSize[8 - 1];
+} UNI_DRC_GAIN_EXTENSION;
+
+/* uniDrcGain() (Table 55) */
+typedef struct {
+  UCHAR nNodes[12]; /* unsaturated value, i.e. as provided in bitstream */
+  GAIN_NODE gainNode[12][16];
+
+  UCHAR uniDrcGainExtPresent;
+  UNI_DRC_GAIN_EXTENSION uniDrcGainExtension;
+} UNI_DRC_GAIN, *HANDLE_UNI_DRC_GAIN;
+
+/****************/
+/* uniDrcConfig */
+/****************/
+
+typedef enum {
+  EB_NIGHT = 0x0001,
+  EB_NOISY = 0x0002,
+  EB_LIMITED = 0x0004,
+  EB_LOWLEVEL = 0x0008,
+  EB_DIALOG = 0x0010,
+  EB_GENERAL_COMPR = 0x0020,
+  EB_EXPAND = 0x0040,
+  EB_ARTISTIC = 0x0080,
+  EB_CLIPPING = 0x0100,
+  EB_FADE = 0x0200,
+  EB_DUCK_OTHER = 0x0400,
+  EB_DUCK_SELF = 0x0800
+} EFFECT_BIT;
+
+typedef enum {
+  GCP_REGULAR = 0,
+  GCP_FADING = 1,
+  GCP_CLIPPING_DUCKING = 2,
+  GCP_CONSTANT = 3
+} GAIN_CODING_PROFILE;
+
+typedef enum { GIT_SPLINE = 0, GIT_LINEAR = 1 } GAIN_INTERPOLATION_TYPE;
+
+typedef enum { CS_LEFT = 0, CS_RIGHT = 1 } CHARACTERISTIC_SIDE;
+
+typedef enum { CF_SIGMOID = 0, CF_NODES = 1 } CHARACTERISTIC_FORMAT;
+
+typedef enum {
+  GF_QMF32 = 0x1,
+  GF_QMFHYBRID39 = 0x2,
+  GF_QMF64 = 0x3,
+  GF_QMFHYBRID71 = 0x4,
+  GF_QMF128 = 0x5,
+  GF_QMFHYBRID135 = 0x6,
+  GF_UNIFORM = 0x7
+} EQ_SUBBAND_GAIN_FORMAT;
+
+typedef struct {
+  UCHAR duckingScalingPresent;
+  FIXP_SGL duckingScaling; /* e = 2 */
+} DUCKING_MODIFICATION;
+
+typedef struct {
+  UCHAR targetCharacteristicLeftPresent;
+  UCHAR targetCharacteristicLeftIndex;
+  UCHAR targetCharacteristicRightPresent;
+  UCHAR targetCharacteristicRightIndex;
+  UCHAR gainScalingPresent;
+  FIXP_SGL attenuationScaling;   /* e = 2 */
+  FIXP_SGL amplificationScaling; /* e = 2 */
+  UCHAR gainOffsetPresent;
+  FIXP_SGL gainOffset; /* e = 4 */
+} GAIN_MODIFICATION;
+
+typedef union {
+  UCHAR crossoverFreqIndex;
+  USHORT startSubBandIndex;
+} BAND_BORDER;
+
+typedef struct {
+  UCHAR left;
+  UCHAR right;
+} CUSTOM_INDEX;
+
+typedef struct {
+  UCHAR present;
+  UCHAR isCICP;
+  union {
+    UCHAR cicpIndex;
+    CUSTOM_INDEX custom;
+  };
+} DRC_CHARACTERISTIC;
+
+typedef struct {
+  UCHAR gainCodingProfile;
+  UCHAR gainInterpolationType;
+  UCHAR fullFrame;
+  UCHAR timeAlignment;
+  UCHAR timeDeltaMinPresent;
+  USHORT timeDeltaMin;
+  UCHAR bandCount;
+  UCHAR drcBandType;
+  UCHAR gainSequenceIndex[4];
+  DRC_CHARACTERISTIC drcCharacteristic[4];
+  BAND_BORDER bandBorder[4];
+} GAIN_SET;
+
+typedef struct {
+  FIXP_SGL gain;    /* e = 6 */
+  FIXP_SGL ioRatio; /* e = 2 */
+  FIXP_SGL exp;     /* e = 5 */
+  UCHAR flipSign;
+} CUSTOM_DRC_CHAR_SIGMOID;
+
+typedef struct {
+  UCHAR characteristicNodeCount;
+  FIXP_SGL nodeLevel[4 + 1]; /* e = 7 */
+  FIXP_SGL nodeGain[4 + 1];  /* e = 7 */
+} CUSTOM_DRC_CHAR_NODES;
+
+typedef shouldBeUnion {
+  CUSTOM_DRC_CHAR_SIGMOID sigmoid;
+  CUSTOM_DRC_CHAR_NODES nodes;
+}
+CUSTOM_DRC_CHAR;
+
+/* drcCoefficientsUniDrc() (Table 67) */
+typedef struct {
+  UCHAR drcLocation;
+  UCHAR drcFrameSizePresent;
+  USHORT drcFrameSize;
+  UCHAR characteristicLeftCount;
+  UCHAR characteristicLeftFormat[8];
+  CUSTOM_DRC_CHAR customCharacteristicLeft[8];
+  UCHAR characteristicRightCount;
+  UCHAR characteristicRightFormat[8];
+  CUSTOM_DRC_CHAR customCharacteristicRight[8];
+  UCHAR
+  gainSequenceCount;  /* unsaturated value, i.e. as provided in bitstream */
+  UCHAR gainSetCount; /* saturated to 12 */
+  GAIN_SET gainSet[12];
+  /* derived data */
+  UCHAR gainSetIndexForGainSequence[12];
+} DRC_COEFFICIENTS_UNI_DRC;
+
+/* drcInstructionsUniDrc() (Table 72) */
+typedef struct {
+  SCHAR drcSetId;
+  UCHAR drcSetComplexityLevel;
+  UCHAR drcLocation;
+  UCHAR drcApplyToDownmix;
+  UCHAR downmixIdCount;
+  UCHAR downmixId[8];
+  USHORT drcSetEffect;
+  UCHAR limiterPeakTargetPresent;
+  FIXP_SGL limiterPeakTarget; /* e = 5 */
+  UCHAR drcSetTargetLoudnessPresent;
+  SCHAR drcSetTargetLoudnessValueUpper;
+  SCHAR drcSetTargetLoudnessValueLower;
+  UCHAR dependsOnDrcSetPresent;
+  union {
+    SCHAR dependsOnDrcSet;
+    UCHAR noIndependentUse;
+  };
+  UCHAR requiresEq;
+  shouldBeUnion {
+    GAIN_MODIFICATION gainModificationForChannelGroup[8][4];
+    DUCKING_MODIFICATION duckingModificationForChannel[8];
+  };
+  SCHAR gainSetIndex[8];
+
+  /* derived data */
+  UCHAR drcChannelCount;
+  UCHAR nDrcChannelGroups;
+  SCHAR gainSetIndexForChannelGroup[8];
+} DRC_INSTRUCTIONS_UNI_DRC;
+
+/* channelLayout() (Table 62) */
+typedef struct {
+  UCHAR baseChannelCount;
+  UCHAR layoutSignalingPresent;
+  UCHAR definedLayout;
+  UCHAR speakerPosition[8];
+} CHANNEL_LAYOUT;
+
+/* downmixInstructions() (Table 63) */
+typedef struct {
+  UCHAR downmixId;
+  UCHAR targetChannelCount;
+  UCHAR targetLayout;
+  UCHAR downmixCoefficientsPresent;
+  UCHAR bsDownmixOffset;
+  FIXP_DBL downmixCoefficient[8 * 8]; /* e = 2 */
+} DOWNMIX_INSTRUCTIONS;
+
+typedef struct {
+  UCHAR uniDrcConfigExtType[8];
+  ULONG extBitSize[8 - 1];
+} UNI_DRC_CONFIG_EXTENSION;
+
+/* uniDrcConfig() (Table 57) */
+typedef struct {
+  UCHAR sampleRatePresent;
+  ULONG sampleRate;
+  UCHAR downmixInstructionsCountV0;
+  UCHAR downmixInstructionsCountV1;
+  UCHAR downmixInstructionsCount; /* saturated to 6 */
+  UCHAR drcCoefficientsUniDrcCountV0;
+  UCHAR drcCoefficientsUniDrcCountV1;
+  UCHAR drcCoefficientsUniDrcCount; /* saturated to 2 */
+  UCHAR drcInstructionsUniDrcCountV0;
+  UCHAR drcInstructionsUniDrcCountV1;
+  UCHAR drcInstructionsUniDrcCount; /* saturated to (12 + 1 + 6) */
+  CHANNEL_LAYOUT channelLayout;
+  DOWNMIX_INSTRUCTIONS downmixInstructions[6];
+  DRC_COEFFICIENTS_UNI_DRC drcCoefficientsUniDrc[2];
+  DRC_INSTRUCTIONS_UNI_DRC drcInstructionsUniDrc[(12 + 1 + 6)];
+  UCHAR uniDrcConfigExtPresent;
+  UNI_DRC_CONFIG_EXTENSION uniDrcConfigExt;
+
+  /* derived data */
+  UCHAR drcInstructionsCountInclVirtual;
+  UCHAR diff;
+} UNI_DRC_CONFIG, *HANDLE_UNI_DRC_CONFIG;
+
+/*******************/
+/* loudnessInfoSet */
+/*******************/
+
+typedef enum {
+  MD_UNKNOWN_OTHER = 0,
+  MD_PROGRAM_LOUDNESS = 1,
+  MD_ANCHOR_LOUDNESS = 2,
+  MD_MAX_OF_LOUDNESS_RANGE = 3,
+  MD_MOMENTARY_LOUDNESS_MAX = 4,
+  MD_SHORT_TERM_LOUDNESS_MAX = 5,
+  MD_LOUDNESS_RANGE = 6,
+  MD_MIXING_LEVEL = 7,
+  MD_ROOM_TYPE = 8,
+  MD_SHORT_TERM_LOUDNESS = 9
+} METHOD_DEFINITION;
+
+typedef enum {
+  MS_UNKNOWN_OTHER = 0,
+  MS_EBU_R_128 = 1,
+  MS_BS_1770_4 = 2,
+  MS_BS_1770_4_PRE_PROCESSING = 3,
+  MS_USER = 4,
+  MS_EXPERT_PANEL = 5,
+  MS_BS_1771_1 = 6,
+  MS_RESERVED_A = 7,
+  MS_RESERVED_B = 8,
+  MS_RESERVED_C = 9,
+  MS_RESERVED_D = 10,
+  MS_RESERVED_E = 11
+} MEASUREMENT_SYSTEM;
+
+typedef enum {
+  R_UKNOWN = 0,
+  R_UNVERIFIED = 1,
+  R_CEILING = 2,
+  R_ACCURATE = 3
+} RELIABILITY;
+
+typedef struct {
+  UCHAR methodDefinition;
+  FIXP_DBL methodValue; /* e = 7 for all methodDefinitions */
+  UCHAR measurementSystem;
+  UCHAR reliability;
+} LOUDNESS_MEASUREMENT;
+
+/* loudnessInfo() (Table 59) */
+typedef struct {
+  SCHAR drcSetId;
+  UCHAR eqSetId;
+  UCHAR downmixId;
+  UCHAR samplePeakLevelPresent;
+  FIXP_DBL samplePeakLevel; /* e = 7 */
+  UCHAR truePeakLevelPresent;
+  FIXP_DBL truePeakLevel; /* e = 7 */
+  UCHAR truePeakLevelMeasurementSystem;
+  UCHAR truePeakLevelReliability;
+  UCHAR measurementCount; /* saturated to 8 */
+  LOUDNESS_MEASUREMENT loudnessMeasurement[8];
+} LOUDNESS_INFO;
+
+/* loudnessInfoSetExtension() (Table 61) */
+typedef struct {
+  UCHAR loudnessInfoSetExtType[8];
+  ULONG extBitSize[8 - 1];
+} LOUDNESS_INFO_SET_EXTENSION;
+
+/* loudnessInfoSet() (Table 58) */
+typedef struct {
+  UCHAR loudnessInfoAlbumCountV0;
+  UCHAR loudnessInfoAlbumCountV1;
+  UCHAR loudnessInfoAlbumCount; /* saturated to 12 */
+  UCHAR loudnessInfoCountV0;
+  UCHAR loudnessInfoCountV1;
+  UCHAR loudnessInfoCount; /* saturated to 12 */
+  LOUDNESS_INFO loudnessInfoAlbum[12];
+  LOUDNESS_INFO loudnessInfo[12];
+  UCHAR loudnessInfoSetExtPresent;
+  LOUDNESS_INFO_SET_EXTENSION loudnessInfoSetExt;
+  /* derived data */
+  UCHAR diff;
+} LOUDNESS_INFO_SET, *HANDLE_LOUDNESS_INFO_SET;
+
+#endif
diff --git a/libDRCdec/src/drcDecoder.h b/libDRCdec/src/drcDecoder.h
new file mode 100644
index 0000000..9826a7b
--- /dev/null
+++ b/libDRCdec/src/drcDecoder.h
@@ -0,0 +1,142 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+#ifndef DRCDECODER_H
+#define DRCDECODER_H
+
+/* drcDecoder.h: definitions used in all submodules */
+
+#define MAX_ACTIVE_DRCS 3
+
+typedef enum { DM_REGULAR_DELAY = 0, DM_LOW_DELAY = 1 } DELAY_MODE;
+
+typedef enum {
+  DE_OK = 0,
+  DE_NOT_OK = -100,
+  DE_PARAM_OUT_OF_RANGE,
+  DE_PARAM_INVALID,
+  DE_MEMORY_ERROR
+} DRC_ERROR;
+
+typedef enum { SDM_OFF, SDM_QMF64, SDM_QMF71, SDM_STFT256 } SUBBAND_DOMAIN_MODE;
+
+#define DOWNMIX_ID_BASE_LAYOUT 0x0
+#define DOWNMIX_ID_ANY_DOWNMIX 0x7F
+#define DRC_SET_ID_NO_DRC 0x0
+#define DRC_SET_ID_ANY_DRC 0x3F
+
+#define LOCATION_MP4_INSTREAM_UNIDRC 0x1
+#define LOCATION_MP4_DYN_RANGE_INFO 0x2
+#define LOCATION_MP4_COMPRESSION_VALUE 0x3
+#define LOCATION_SELECTED \
+  LOCATION_MP4_INSTREAM_UNIDRC /* set to location selected by system */
+
+#define MAX_REQUESTS_DOWNMIX_ID 15
+#define MAX_REQUESTS_DRC_FEATURE 7
+#define MAX_REQUESTS_DRC_EFFECT_TYPE 15
+
+#define DEFAULT_LOUDNESS_DEVIATION_MAX 63
+
+#define DRC_INPUT_LOUDNESS_TARGET FL2FXCONST_DBL(-31.0f / (float)(1 << 7))
+#define DRC_INPUT_LOUDNESS_TARGET_SGL FL2FXCONST_SGL(-31.0f / (float)(1 << 7))
+
+#endif
diff --git a/libDRCdec/src/drcGainDec_init.cpp b/libDRCdec/src/drcGainDec_init.cpp
new file mode 100644
index 0000000..38f3243
--- /dev/null
+++ b/libDRCdec/src/drcGainDec_init.cpp
@@ -0,0 +1,344 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+#include "drcDec_types.h"
+#include "drcDec_tools.h"
+#include "drcDec_gainDecoder.h"
+#include "drcGainDec_init.h"
+
+static DRC_ERROR _generateDrcInstructionsDerivedData(
+    HANDLE_DRC_GAIN_DECODER hGainDec, HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+    DRC_INSTRUCTIONS_UNI_DRC* pInst, DRC_COEFFICIENTS_UNI_DRC* pCoef,
+    ACTIVE_DRC* pActiveDrc) {
+  DRC_ERROR err = DE_OK;
+  int g;
+  int gainElementCount = 0;
+  UCHAR nDrcChannelGroups = 0;
+  SCHAR gainSetIndexForChannelGroup[8];
+
+  err = deriveDrcChannelGroups(
+      pInst->drcSetEffect, pInst->drcChannelCount, pInst->gainSetIndex,
+      pInst->drcSetEffect & (EB_DUCK_OTHER | EB_DUCK_SELF)
+          ? pInst->duckingModificationForChannel
+          : NULL,
+      &nDrcChannelGroups, gainSetIndexForChannelGroup,
+      pActiveDrc->channelGroupForChannel,
+      pInst->drcSetEffect & (EB_DUCK_OTHER | EB_DUCK_SELF)
+          ? pActiveDrc->duckingModificationForChannelGroup
+          : NULL);
+  if (err) return (err);
+
+  /* sanity check */
+  if (nDrcChannelGroups != pInst->nDrcChannelGroups) return DE_NOT_OK;
+  for (g = 0; g < pInst->nDrcChannelGroups; g++) {
+    if (gainSetIndexForChannelGroup[g] != pInst->gainSetIndexForChannelGroup[g])
+      return DE_NOT_OK;
+  }
+
+  for (g = 0; g < pInst->nDrcChannelGroups; g++) {
+    int seq = pInst->gainSetIndexForChannelGroup[g];
+    if (seq != -1 && (hUniDrcConfig->drcCoefficientsUniDrcCount == 0 ||
+                      seq >= pCoef->gainSetCount)) {
+      pActiveDrc->channelGroupIsParametricDrc[g] = 1;
+    } else {
+      pActiveDrc->channelGroupIsParametricDrc[g] = 0;
+      if (seq >= pCoef->gainSetCount) {
+        return DE_NOT_OK;
+      }
+    }
+  }
+
+  /* gainElementCount */
+  if (pInst->drcSetEffect & (EB_DUCK_OTHER | EB_DUCK_SELF)) {
+    for (g = 0; g < pInst->nDrcChannelGroups; g++) {
+      pActiveDrc->bandCountForChannelGroup[g] = 1;
+    }
+    pActiveDrc->gainElementCount =
+        pInst->nDrcChannelGroups; /* one gain element per channel group */
+  } else {
+    for (g = 0; g < pInst->nDrcChannelGroups; g++) {
+      if (pActiveDrc->channelGroupIsParametricDrc[g]) {
+        gainElementCount++;
+        pActiveDrc->bandCountForChannelGroup[g] = 1;
+      } else {
+        int seq, bandCount;
+        seq = pInst->gainSetIndexForChannelGroup[g];
+        bandCount = pCoef->gainSet[seq].bandCount;
+        pActiveDrc->bandCountForChannelGroup[g] = bandCount;
+        gainElementCount += bandCount;
+      }
+    }
+    pActiveDrc->gainElementCount = gainElementCount;
+  }
+
+  /* prepare gainElementForGroup (cumulated sum of bandCountForChannelGroup) */
+  pActiveDrc->gainElementForGroup[0] = 0;
+  for (g = 1; g < pInst->nDrcChannelGroups; g++) {
+    pActiveDrc->gainElementForGroup[g] =
+        pActiveDrc->gainElementForGroup[g - 1] +
+        pActiveDrc->bandCountForChannelGroup[g - 1]; /* index of first gain
+                                                        sequence in channel
+                                                        group */
+  }
+
+  return DE_OK;
+}
+
+DRC_ERROR
+initGainDec(HANDLE_DRC_GAIN_DECODER hGainDec, const int frameSize,
+            const int sampleRate) {
+  int i, j, k;
+
+  if (frameSize < 1) {
+    return DE_NOT_OK;
+  }
+
+  hGainDec->frameSize = frameSize;
+
+  if (hGainDec->frameSize * 1000 < sampleRate) {
+    return DE_NOT_OK;
+  }
+
+  hGainDec->deltaTminDefault = getDeltaTmin(sampleRate);
+  if (hGainDec->deltaTminDefault > hGainDec->frameSize) {
+    return DE_NOT_OK;
+  }
+
+  for (i = 0; i < MAX_ACTIVE_DRCS; i++) {
+    for (j = 0; j < 8; j++) {
+      /* use startup node at the beginning */
+      hGainDec->activeDrc[i].lnbIndexForChannel[j][0] = 0;
+      for (k = 1; k < NUM_LNB_FRAMES; k++) {
+        hGainDec->activeDrc[i].lnbIndexForChannel[j][k] = -1;
+      }
+    }
+  }
+
+  for (j = 0; j < 8; j++) {
+    hGainDec->channelGain[j] = FL2FXCONST_DBL(1.0f / (float)(1 << 8));
+  }
+
+  for (i = 0; i < 4 * 1024 / 256; i++) {
+    hGainDec->dummySubbandGains[i] = FL2FXCONST_DBL(1.0f / (float)(1 << 7));
+  }
+
+  hGainDec->status = 0; /* startup */
+
+  return DE_OK;
+}
+
+void initDrcGainBuffers(const int frameSize, DRC_GAIN_BUFFERS* drcGainBuffers) {
+  int i, c, j;
+  /* prepare 12 instances of node buffers */
+  for (i = 0; i < 12; i++) {
+    for (j = 0; j < NUM_LNB_FRAMES; j++) {
+      drcGainBuffers->linearNodeBuffer[i].nNodes[j] = 1;
+      drcGainBuffers->linearNodeBuffer[i].linearNode[j][0].gainLin =
+          FL2FXCONST_DBL(1.0f / (float)(1 << 7));
+      if (j == 0) {
+        drcGainBuffers->linearNodeBuffer[i].linearNode[j][0].time =
+            0; /* initialize last node with startup node */
+      } else {
+        drcGainBuffers->linearNodeBuffer[i].linearNode[j][0].time =
+            frameSize - 1;
+      }
+    }
+  }
+
+  /* prepare dummyLnb, a linearNodeBuffer containing a constant gain of 0 dB,
+   * for the "no DRC processing" case */
+  drcGainBuffers->dummyLnb.gainInterpolationType = GIT_LINEAR;
+  for (i = 0; i < NUM_LNB_FRAMES; i++) {
+    drcGainBuffers->dummyLnb.nNodes[i] = 1;
+    drcGainBuffers->dummyLnb.linearNode[i][0].gainLin =
+        FL2FXCONST_DBL(1.0f / (float)(1 << 7));
+    drcGainBuffers->dummyLnb.linearNode[i][0].time = frameSize - 1;
+  }
+
+  /* prepare channelGain delay line */
+  for (c = 0; c < 8; c++) {
+    for (i = 0; i < NUM_LNB_FRAMES; i++) {
+      drcGainBuffers->channelGain[c][i] =
+          FL2FXCONST_DBL(1.0f / (float)(1 << 8));
+    }
+  }
+
+  drcGainBuffers->lnbPointer = 0;
+}
+
+DRC_ERROR
+initActiveDrc(HANDLE_DRC_GAIN_DECODER hGainDec,
+              HANDLE_UNI_DRC_CONFIG hUniDrcConfig, const int drcSetIdSelected,
+              const int downmixIdSelected) {
+  int g, isMultiband = 0;
+  DRC_ERROR err = DE_OK;
+  DRC_INSTRUCTIONS_UNI_DRC* pInst = NULL;
+  DRC_COEFFICIENTS_UNI_DRC* pCoef = NULL;
+
+  pInst = selectDrcInstructions(hUniDrcConfig, drcSetIdSelected);
+  if (pInst == NULL) {
+    return DE_NOT_OK;
+  }
+
+  if (pInst->drcSetId >= 0) {
+    pCoef = selectDrcCoefficients(hUniDrcConfig, pInst->drcLocation);
+    if (pCoef == NULL) {
+      return DE_NOT_OK;
+    }
+
+    if (pCoef->drcFrameSizePresent) {
+      if (pCoef->drcFrameSize != hGainDec->frameSize) {
+        return DE_NOT_OK;
+      }
+    }
+
+    err = _generateDrcInstructionsDerivedData(
+        hGainDec, hUniDrcConfig, pInst, pCoef,
+        &(hGainDec->activeDrc[hGainDec->nActiveDrcs]));
+    if (err) return err;
+  }
+
+  hGainDec->activeDrc[hGainDec->nActiveDrcs].pInst = pInst;
+  hGainDec->activeDrc[hGainDec->nActiveDrcs].pCoef = pCoef;
+
+  for (g = 0; g < pInst->nDrcChannelGroups; g++) {
+    if (hGainDec->activeDrc[hGainDec->nActiveDrcs].bandCountForChannelGroup[g] >
+        1) {
+      if (hGainDec->multiBandActiveDrcIndex != -1) {
+        return DE_NOT_OK;
+      }
+      isMultiband = 1;
+    }
+  }
+
+  if (isMultiband) {
+    /* Keep activeDrc index of multiband DRC set */
+    hGainDec->multiBandActiveDrcIndex = hGainDec->nActiveDrcs;
+  }
+
+  if ((hGainDec->channelGainActiveDrcIndex == -1) &&
+      (downmixIdSelected == DOWNMIX_ID_BASE_LAYOUT) &&
+      (hUniDrcConfig->drcInstructionsUniDrcCount >
+       0)) { /* use this activeDrc to apply channelGains */
+    hGainDec->channelGainActiveDrcIndex = hGainDec->nActiveDrcs;
+  }
+
+  hGainDec->nActiveDrcs++;
+  if (hGainDec->nActiveDrcs > MAX_ACTIVE_DRCS) return DE_NOT_OK;
+
+  return DE_OK;
+}
+
+DRC_ERROR
+initActiveDrcOffset(HANDLE_DRC_GAIN_DECODER hGainDec) {
+  int a, accGainElementCount;
+
+  accGainElementCount = 0;
+  for (a = 0; a < hGainDec->nActiveDrcs; a++) {
+    hGainDec->activeDrc[a].activeDrcOffset = accGainElementCount;
+    accGainElementCount += hGainDec->activeDrc[a].gainElementCount;
+  }
+
+  if (accGainElementCount > 12) return DE_NOT_OK;
+
+  return DE_OK;
+}
diff --git a/libDRCdec/src/drcGainDec_init.h b/libDRCdec/src/drcGainDec_init.h
new file mode 100644
index 0000000..9215bc3
--- /dev/null
+++ b/libDRCdec/src/drcGainDec_init.h
@@ -0,0 +1,120 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+#ifndef DRCGAINDEC_INIT_H
+#define DRCGAINDEC_INIT_H
+
+DRC_ERROR
+initGainDec(HANDLE_DRC_GAIN_DECODER hGainDec, const int frameSize,
+            const int sampleRate);
+
+void initDrcGainBuffers(const int frameSize, DRC_GAIN_BUFFERS* drcGainBuffers);
+
+DRC_ERROR
+initActiveDrc(HANDLE_DRC_GAIN_DECODER hGainDec,
+              HANDLE_UNI_DRC_CONFIG hUniDrcConfig, const int drcSetIdSelected,
+              const int downmixIdSelected);
+
+DRC_ERROR
+initActiveDrcOffset(HANDLE_DRC_GAIN_DECODER hGainDec);
+
+#endif
diff --git a/libDRCdec/src/drcGainDec_preprocess.cpp b/libDRCdec/src/drcGainDec_preprocess.cpp
new file mode 100644
index 0000000..7919589
--- /dev/null
+++ b/libDRCdec/src/drcGainDec_preprocess.cpp
@@ -0,0 +1,714 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+#include "drcDec_types.h"
+#include "drcDec_gainDecoder.h"
+#include "drcGainDec_preprocess.h"
+#include "drcDec_tools.h"
+#include "FDK_matrixCalloc.h"
+#include "drcDec_rom.h"
+
+#define SLOPE_FACTOR_DB_TO_LINEAR \
+  FL2FXCONST_DBL(0.1151f * (float)(1 << 3)) /* ln(10) / 20 */
+
+typedef struct {
+  int drcSetEffect;
+  DUCKING_MODIFICATION* pDMod;
+  GAIN_MODIFICATION* pGMod;
+  int drcCharacteristicPresent;
+  CHARACTERISTIC_FORMAT characteristicFormatSource[2];
+  const CUSTOM_DRC_CHAR* pCCharSource[2];
+  CHARACTERISTIC_FORMAT characteristicFormatTarget[2];
+  const CUSTOM_DRC_CHAR* pCCharTarget[2];
+  int slopeIsNegative;
+  int limiterPeakTargetPresent;
+  FIXP_SGL limiterPeakTarget;
+  FIXP_DBL loudnessNormalizationGainDb;
+  FIXP_SGL compress;
+  FIXP_SGL boost;
+} NODE_MODIFICATION;
+
+static DRC_ERROR _getCicpCharacteristic(
+    const int cicpCharacteristic,
+    CHARACTERISTIC_FORMAT pCharacteristicFormat[2],
+    const CUSTOM_DRC_CHAR* pCCharSource[2]) {
+  if ((cicpCharacteristic < 1) || (cicpCharacteristic > 11)) {
+    return DE_NOT_OK;
+  }
+
+  if (cicpCharacteristic < 7) { /* sigmoid characteristic */
+    pCharacteristicFormat[CS_LEFT] = CF_SIGMOID;
+    pCCharSource[CS_LEFT] =
+        (const CUSTOM_DRC_CHAR*)(&cicpDrcCharSigmoidLeft[cicpCharacteristic -
+                                                         1]);
+    pCharacteristicFormat[CS_RIGHT] = CF_SIGMOID;
+    pCCharSource[CS_RIGHT] =
+        (const CUSTOM_DRC_CHAR*)(&cicpDrcCharSigmoidRight[cicpCharacteristic -
+                                                          1]);
+  } else { /* nodes characteristic */
+    pCharacteristicFormat[CS_LEFT] = CF_NODES;
+    pCCharSource[CS_LEFT] =
+        (const CUSTOM_DRC_CHAR*)(&cicpDrcCharNodesLeft[cicpCharacteristic - 7]);
+    pCharacteristicFormat[CS_RIGHT] = CF_NODES;
+    pCCharSource[CS_RIGHT] =
+        (const CUSTOM_DRC_CHAR*)(&cicpDrcCharNodesRight[cicpCharacteristic -
+                                                        7]);
+  }
+  return DE_OK;
+}
+
+static int _getSign(FIXP_SGL in) {
+  if (in > (FIXP_DBL)0) return 1;
+  if (in < (FIXP_DBL)0) return -1;
+  return 0;
+}
+
+static DRC_ERROR _getSlopeSign(const CHARACTERISTIC_FORMAT drcCharFormat,
+                               const CUSTOM_DRC_CHAR* pCChar, int* pSlopeSign) {
+  if (drcCharFormat == CF_SIGMOID) {
+    *pSlopeSign = (pCChar->sigmoid.flipSign ? 1 : -1);
+  } else {
+    int k, slopeSign = 0, tmp_slopeSign;
+    for (k = 0; k < pCChar->nodes.characteristicNodeCount; k++) {
+      if (pCChar->nodes.nodeLevel[k + 1] > pCChar->nodes.nodeLevel[k]) {
+        tmp_slopeSign =
+            _getSign(pCChar->nodes.nodeGain[k + 1] - pCChar->nodes.nodeGain[k]);
+      } else {
+        tmp_slopeSign = -_getSign(pCChar->nodes.nodeGain[k + 1] -
+                                  pCChar->nodes.nodeGain[k]);
+      }
+      if ((slopeSign || tmp_slopeSign) && (slopeSign == -tmp_slopeSign))
+        return DE_NOT_OK; /* DRC characteristic is not invertible */
+      else
+        slopeSign = tmp_slopeSign;
+    }
+    *pSlopeSign = slopeSign;
+  }
+  return DE_OK;
+}
+
+static DRC_ERROR _isSlopeNegative(const CHARACTERISTIC_FORMAT drcCharFormat[2],
+                                  const CUSTOM_DRC_CHAR* pCChar[2],
+                                  int* pSlopeIsNegative) {
+  DRC_ERROR err = DE_OK;
+  int slopeSign[2] = {0, 0};
+
+  err = _getSlopeSign(drcCharFormat[CS_LEFT], pCChar[CS_LEFT],
+                      &slopeSign[CS_LEFT]);
+  if (err) return err;
+
+  err = _getSlopeSign(drcCharFormat[CS_RIGHT], pCChar[CS_RIGHT],
+                      &slopeSign[CS_RIGHT]);
+  if (err) return err;
+
+  if ((slopeSign[CS_LEFT] || slopeSign[CS_RIGHT]) &&
+      (slopeSign[CS_LEFT] == -slopeSign[CS_RIGHT]))
+    return DE_NOT_OK; /* DRC characteristic is not invertible */
+
+  *pSlopeIsNegative = (slopeSign[CS_LEFT] < 0);
+  return DE_OK;
+}
+
+static DRC_ERROR _prepareDrcCharacteristic(const DRC_CHARACTERISTIC* pDChar,
+                                           DRC_COEFFICIENTS_UNI_DRC* pCoef,
+                                           const int b,
+                                           NODE_MODIFICATION* pNodeMod) {
+  DRC_ERROR err = DE_OK;
+  pNodeMod->drcCharacteristicPresent = pDChar->present;
+  if (pNodeMod->drcCharacteristicPresent) {
+    if (pDChar->isCICP == 1) {
+      err = _getCicpCharacteristic(pDChar->cicpIndex,
+                                   pNodeMod->characteristicFormatSource,
+                                   pNodeMod->pCCharSource);
+      if (err) return err;
+    } else {
+      pNodeMod->characteristicFormatSource[CS_LEFT] =
+          (CHARACTERISTIC_FORMAT)
+              pCoef->characteristicLeftFormat[pDChar->custom.left];
+      pNodeMod->pCCharSource[CS_LEFT] =
+          &(pCoef->customCharacteristicLeft[pDChar->custom.left]);
+      pNodeMod->characteristicFormatSource[CS_RIGHT] =
+          (CHARACTERISTIC_FORMAT)
+              pCoef->characteristicRightFormat[pDChar->custom.right];
+      pNodeMod->pCCharSource[CS_RIGHT] =
+          &(pCoef->customCharacteristicRight[pDChar->custom.right]);
+    }
+    err = _isSlopeNegative(pNodeMod->characteristicFormatSource,
+                           pNodeMod->pCCharSource, &pNodeMod->slopeIsNegative);
+    if (err) return err;
+
+    if (pNodeMod->pGMod != NULL) {
+      if (pNodeMod->pGMod[b].targetCharacteristicLeftPresent) {
+        pNodeMod->characteristicFormatTarget[CS_LEFT] =
+            (CHARACTERISTIC_FORMAT)pCoef->characteristicLeftFormat
+                [pNodeMod->pGMod[b].targetCharacteristicLeftIndex];
+        pNodeMod->pCCharTarget[CS_LEFT] =
+            &(pCoef->customCharacteristicLeft
+                  [pNodeMod->pGMod[b].targetCharacteristicLeftIndex]);
+      }
+      if (pNodeMod->pGMod[b].targetCharacteristicRightPresent) {
+        pNodeMod->characteristicFormatTarget[CS_RIGHT] =
+            (CHARACTERISTIC_FORMAT)pCoef->characteristicRightFormat
+                [pNodeMod->pGMod[b].targetCharacteristicRightIndex];
+        pNodeMod->pCCharTarget[CS_RIGHT] =
+            &(pCoef->customCharacteristicRight
+                  [pNodeMod->pGMod[b].targetCharacteristicRightIndex]);
+      }
+    }
+  }
+  return DE_OK;
+}
+
+static DRC_ERROR _compressorIO_sigmoid_common(
+    const FIXP_DBL tmp,               /* e = 7 */
+    const FIXP_DBL gainDbLimit,       /* e = 6 */
+    const FIXP_DBL exp,               /* e = 5 */
+    const int inverse, FIXP_DBL* out) /* e = 7 */
+{
+  FIXP_DBL x, tmp1, tmp2, invExp, denom;
+  int e_x, e_tmp1, e_tmp2, e_invExp, e_denom, e_out;
+
+  if (exp < FL2FXCONST_DBL(1.0f / (float)(1 << 5))) {
+    return DE_NOT_OK;
+  }
+
+  /* x = tmp / gainDbLimit; */
+  x = fDivNormSigned(tmp, gainDbLimit, &e_x);
+  e_x += 7 - 6;
+  if (x < (FIXP_DBL)0) {
+    return DE_NOT_OK;
+  }
+
+  /* out = tmp / pow(1.0f +/- pow(x, exp), 1.0f/exp); */
+  tmp1 = fPow(x, e_x, exp, 5, &e_tmp1);
+  if (inverse) tmp1 = -tmp1;
+  tmp2 = fAddNorm(FL2FXCONST_DBL(1.0f / (float)(1 << 1)), 1, tmp1, e_tmp1,
+                  &e_tmp2);
+  invExp = fDivNorm(FL2FXCONST_DBL(1.0f / (float)(1 << 1)), exp, &e_invExp);
+  e_invExp += 1 - 5;
+  denom = fPow(tmp2, e_tmp2, invExp, e_invExp, &e_denom);
+  *out = fDivNormSigned(tmp, denom, &e_out);
+  e_out += 7 - e_denom;
+  *out = scaleValueSaturate(*out, e_out - 7);
+  return DE_OK;
+}
+
+static DRC_ERROR _compressorIO_sigmoid(const CUSTOM_DRC_CHAR_SIGMOID* pCChar,
+                                       const FIXP_DBL inLevelDb, /* e = 7 */
+                                       FIXP_DBL* outGainDb)      /* e = 7 */
+{
+  FIXP_DBL tmp;
+  FIXP_SGL exp = pCChar->exp;
+  DRC_ERROR err = DE_OK;
+
+  tmp = fMultDiv2(DRC_INPUT_LOUDNESS_TARGET - inLevelDb, pCChar->ioRatio);
+  tmp = SATURATE_LEFT_SHIFT(tmp, 2 + 1, DFRACT_BITS);
+  if (exp < (FIXP_SGL)MAXVAL_SGL) {
+    /* x = tmp / gainDbLimit; */
+    /* *outGainDb = tmp / pow(1.0f + pow(x, exp), 1.0f/exp); */
+    err = _compressorIO_sigmoid_common(tmp, FX_SGL2FX_DBL(pCChar->gain),
+                                       FX_SGL2FX_DBL(exp), 0, outGainDb);
+    if (err) return err;
+  } else {
+    *outGainDb =
+        tmp; /* scaling of outGainDb (7) is equal to scaling of tmp (7) */
+  }
+  if (pCChar->flipSign == 1) {
+    *outGainDb = -*outGainDb;
+  }
+  return err;
+}
+
+static DRC_ERROR _compressorIO_sigmoid_inverse(
+    const CUSTOM_DRC_CHAR_SIGMOID* pCChar, const FIXP_SGL gainDb,
+    FIXP_DBL* inLev) {
+  DRC_ERROR err = DE_OK;
+  FIXP_SGL ioRatio = pCChar->ioRatio;
+  FIXP_SGL exp = pCChar->exp;
+  FIXP_DBL tmp = FX_SGL2FX_DBL(gainDb), tmp_out;
+  int e_out;
+
+  if (pCChar->flipSign == 1) {
+    tmp = -tmp;
+  }
+  if (exp < (FIXP_SGL)MAXVAL_SGL) {
+    /* x = tmp / gainDbLimit; */
+    /* tmp = tmp / pow(1.0f - pow(x, exp), 1.0f / exp); */
+    err = _compressorIO_sigmoid_common(tmp, FX_SGL2FX_DBL(pCChar->gain),
+                                       FX_SGL2FX_DBL(exp), 1, &tmp);
+    if (err) return err;
+  }
+  if (ioRatio == (FIXP_SGL)0) {
+    return DE_NOT_OK;
+  }
+  tmp_out = fDivNormSigned(tmp, FX_SGL2FX_DBL(ioRatio), &e_out);
+  e_out += 7 - 2;
+  tmp_out = fAddNorm(DRC_INPUT_LOUDNESS_TARGET, 7, -tmp_out, e_out, &e_out);
+  *inLev = scaleValueSaturate(tmp_out, e_out - 7);
+
+  return err;
+}
+
+static DRC_ERROR _compressorIO_nodes(const CUSTOM_DRC_CHAR_NODES* pCChar,
+                                     const FIXP_DBL inLevelDb, /* e = 7 */
+                                     FIXP_DBL* outGainDb)      /* e = 7 */
+{
+  int n;
+  FIXP_DBL w;
+  const FIXP_SGL* nodeLevel = pCChar->nodeLevel;
+  const FIXP_SGL* nodeGain = pCChar->nodeGain;
+
+  if (inLevelDb < DRC_INPUT_LOUDNESS_TARGET) {
+    for (n = 0; n < pCChar->characteristicNodeCount; n++) {
+      if ((inLevelDb <= FX_SGL2FX_DBL(nodeLevel[n])) &&
+          (inLevelDb > FX_SGL2FX_DBL(nodeLevel[n + 1]))) {
+        w = fDivNorm(inLevelDb - FX_SGL2FX_DBL(nodeLevel[n + 1]),
+                     FX_SGL2FX_DBL(nodeLevel[n] - nodeLevel[n + 1]));
+        *outGainDb = fMult(w, nodeGain[n]) +
+                     fMult((FIXP_DBL)MAXVAL_DBL - w, nodeGain[n + 1]);
+        /* *outGainDb = (w * nodeGain[n] + (1.0-w) * nodeGain[n+1]); */
+        return DE_OK;
+      }
+    }
+  } else {
+    for (n = 0; n < pCChar->characteristicNodeCount; n++) {
+      if ((inLevelDb >= FX_SGL2FX_DBL(nodeLevel[n])) &&
+          (inLevelDb < FX_SGL2FX_DBL(nodeLevel[n + 1]))) {
+        w = fDivNorm(FX_SGL2FX_DBL(nodeLevel[n + 1]) - inLevelDb,
+                     FX_SGL2FX_DBL(nodeLevel[n + 1] - nodeLevel[n]));
+        *outGainDb = fMult(w, nodeGain[n]) +
+                     fMult((FIXP_DBL)MAXVAL_DBL - w, nodeGain[n + 1]);
+        /* *outGainDb = (w * nodeGain[n] + (1.0-w) * nodeGain[n+1]); */
+        return DE_OK;
+      }
+    }
+  }
+  *outGainDb = FX_SGL2FX_DBL(nodeGain[pCChar->characteristicNodeCount]);
+  return DE_OK;
+}
+
+static DRC_ERROR _compressorIO_nodes_inverse(
+    const CUSTOM_DRC_CHAR_NODES* pCChar, const FIXP_SGL gainDb, /* e = 7 */
+    FIXP_DBL* inLev)                                            /* e = 7 */
+{
+  int n;
+  int k;
+  FIXP_DBL w;
+  int gainIsNegative = 0;
+  const FIXP_SGL* nodeLevel = pCChar->nodeLevel;
+  const FIXP_SGL* nodeGain = pCChar->nodeGain;
+  int nodeCount = pCChar->characteristicNodeCount;
+  for (k = 0; k < nodeCount; k++) {
+    if (pCChar->nodeGain[k + 1] < (FIXP_SGL)0) {
+      gainIsNegative = 1;
+    }
+  }
+  if (gainIsNegative == 1) {
+    if (gainDb <= nodeGain[nodeCount]) {
+      *inLev = FX_SGL2FX_DBL(nodeLevel[nodeCount]);
+    } else {
+      if (gainDb >= (FIXP_SGL)0) {
+        *inLev = DRC_INPUT_LOUDNESS_TARGET;
+      } else {
+        for (n = 0; n < nodeCount; n++) {
+          if ((gainDb <= nodeGain[n]) && (gainDb > nodeGain[n + 1])) {
+            FIXP_SGL gainDelta = nodeGain[n] - nodeGain[n + 1];
+            if (gainDelta == (FIXP_SGL)0) {
+              *inLev = FX_SGL2FX_DBL(nodeLevel[n]);
+              return DE_OK;
+            }
+            w = fDivNorm(gainDb - nodeGain[n + 1], gainDelta);
+            *inLev = fMult(w, nodeLevel[n]) +
+                     fMult((FIXP_DBL)MAXVAL_DBL - w, nodeLevel[n + 1]);
+            /* *inLev = (w * nodeLevel[n] + (1.0-w) * nodeLevel[n+1]); */
+            return DE_OK;
+          }
+        }
+        *inLev = FX_SGL2FX_DBL(nodeLevel[nodeCount]);
+      }
+    }
+  } else {
+    if (gainDb >= nodeGain[nodeCount]) {
+      *inLev = FX_SGL2FX_DBL(nodeLevel[nodeCount]);
+    } else {
+      if (gainDb <= (FIXP_SGL)0) {
+        *inLev = DRC_INPUT_LOUDNESS_TARGET;
+      } else {
+        for (n = 0; n < nodeCount; n++) {
+          if ((gainDb >= nodeGain[n]) && (gainDb < nodeGain[n + 1])) {
+            FIXP_SGL gainDelta = nodeGain[n + 1] - nodeGain[n];
+            if (gainDelta == (FIXP_SGL)0) {
+              *inLev = FX_SGL2FX_DBL(nodeLevel[n]);
+              return DE_OK;
+            }
+            w = fDivNorm(nodeGain[n + 1] - gainDb, gainDelta);
+            *inLev = fMult(w, nodeLevel[n]) +
+                     fMult((FIXP_DBL)MAXVAL_DBL - w, nodeLevel[n + 1]);
+            /* *inLev = (w * nodeLevel[n] + (1.0-w) * nodeLevel[n+1]); */
+            return DE_OK;
+          }
+        }
+        *inLev = FX_SGL2FX_DBL(nodeLevel[nodeCount]);
+      }
+    }
+  }
+  return DE_OK;
+}
+
+static DRC_ERROR _mapGain(const CHARACTERISTIC_FORMAT pCCharFormatSource,
+                          const CUSTOM_DRC_CHAR* pCCharSource,
+                          const CHARACTERISTIC_FORMAT pCCharFormatTarget,
+                          const CUSTOM_DRC_CHAR* pCCharTarget,
+                          const FIXP_SGL gainInDb, /* e = 7 */
+                          FIXP_DBL* gainOutDb)     /* e = 7 */
+{
+  FIXP_DBL inLevel = (FIXP_DBL)0;
+  DRC_ERROR err = DE_OK;
+
+  switch (pCCharFormatSource) {
+    case CF_SIGMOID:
+      err = _compressorIO_sigmoid_inverse(
+          (const CUSTOM_DRC_CHAR_SIGMOID*)pCCharSource, gainInDb, &inLevel);
+      if (err) return err;
+      break;
+    case CF_NODES:
+      err = _compressorIO_nodes_inverse(
+          (const CUSTOM_DRC_CHAR_NODES*)pCCharSource, gainInDb, &inLevel);
+      if (err) return err;
+      break;
+    default:
+      return DE_NOT_OK;
+  }
+  switch (pCCharFormatTarget) {
+    case CF_SIGMOID:
+      err = _compressorIO_sigmoid((const CUSTOM_DRC_CHAR_SIGMOID*)pCCharTarget,
+                                  inLevel, gainOutDb);
+      if (err) return err;
+      break;
+    case CF_NODES:
+      err = _compressorIO_nodes((const CUSTOM_DRC_CHAR_NODES*)pCCharTarget,
+                                inLevel, gainOutDb);
+      if (err) return err;
+      break;
+    default:
+      break;
+  }
+  return DE_OK;
+}
+
+static DRC_ERROR _toLinear(
+    const NODE_MODIFICATION* nodeMod, const int drcBand,
+    const FIXP_SGL gainDb,  /* in: gain value in dB, e = 7 */
+    const FIXP_SGL slopeDb, /* in: slope value in dB/deltaTmin, e = 2 */
+    FIXP_DBL* gainLin,      /* out: linear gain value, e = 7 */
+    FIXP_DBL* slopeLin)     /* out: linear slope value, e = 7 */
+{
+  FIXP_DBL gainRatio_m = FL2FXCONST_DBL(1.0f / (float)(1 << 1));
+  GAIN_MODIFICATION* pGMod = NULL;
+  DUCKING_MODIFICATION* pDMod = nodeMod->pDMod;
+  FIXP_DBL tmp_dbl, gainDb_modified, gainDb_offset, gainDb_out, gainLin_m,
+      slopeLin_m;
+  int gainLin_e, gainRatio_e = 1, gainDb_out_e;
+  if (nodeMod->pGMod != NULL) {
+    pGMod = &(nodeMod->pGMod[drcBand]);
+  }
+  if (((nodeMod->drcSetEffect & (EB_DUCK_OTHER | EB_DUCK_SELF)) == 0) &&
+      (nodeMod->drcSetEffect != EB_FADE) &&
+      (nodeMod->drcSetEffect != EB_CLIPPING)) {
+    DRC_ERROR err = DE_OK;
+    FIXP_DBL gainDbMapped;
+
+    if ((pGMod != NULL) && (nodeMod->drcCharacteristicPresent)) {
+      if (((gainDb > (FIXP_SGL)0) && nodeMod->slopeIsNegative) ||
+          ((gainDb < (FIXP_SGL)0) && !nodeMod->slopeIsNegative)) {
+        /* left side */
+        if (pGMod->targetCharacteristicLeftPresent == 1) {
+          err = _mapGain(nodeMod->characteristicFormatSource[CS_LEFT],
+                         nodeMod->pCCharSource[CS_LEFT],
+                         nodeMod->characteristicFormatTarget[CS_LEFT],
+                         nodeMod->pCCharTarget[CS_LEFT], gainDb, &gainDbMapped);
+          if (err) return err;
+          gainRatio_m = fDivNormSigned(
+              gainDbMapped, FX_SGL2FX_DBL(gainDb),
+              &gainRatio_e); /* target characteristic in payload */
+        }
+      }
+
+      else { /* if (((gainDb < (FIXP_SGL)0) && nodeMod->slopeIsNegative) ||
+                ((gainDb > (FIXP_SGL)0) && !nodeMod->slopeIsNegative)) */
+
+        /* right side */
+        if (pGMod->targetCharacteristicRightPresent == 1) {
+          err =
+              _mapGain(nodeMod->characteristicFormatSource[CS_RIGHT],
+                       nodeMod->pCCharSource[CS_RIGHT],
+                       nodeMod->characteristicFormatTarget[CS_RIGHT],
+                       nodeMod->pCCharTarget[CS_RIGHT], gainDb, &gainDbMapped);
+          if (err) return err;
+          gainRatio_m = fDivNormSigned(
+              gainDbMapped, FX_SGL2FX_DBL(gainDb),
+              &gainRatio_e); /* target characteristic in payload */
+        }
+      }
+    }
+    if (gainDb < (FIXP_SGL)0) {
+      gainRatio_m = fMultDiv2(gainRatio_m, nodeMod->compress);
+    } else {
+      gainRatio_m = fMultDiv2(gainRatio_m, nodeMod->boost);
+    }
+    gainRatio_e += 2;
+  }
+  if ((pGMod != NULL) && (pGMod->gainScalingPresent == 1)) {
+    if (gainDb < (FIXP_SGL)0) {
+      gainRatio_m = fMultDiv2(gainRatio_m, pGMod->attenuationScaling);
+    } else {
+      gainRatio_m = fMultDiv2(gainRatio_m, pGMod->amplificationScaling);
+    }
+    gainRatio_e += 3;
+  }
+  if ((pDMod != NULL) &&
+      (nodeMod->drcSetEffect & (EB_DUCK_OTHER | EB_DUCK_SELF)) &&
+      (pDMod->duckingScalingPresent == 1)) {
+    gainRatio_m = fMultDiv2(gainRatio_m, pDMod->duckingScaling);
+    gainRatio_e += 3;
+  }
+
+  gainDb_modified =
+      fMultDiv2(gainDb, gainRatio_m); /* resulting e: 7 + gainRatio_e + 1*/
+  gainDb_offset = (FIXP_DBL)0;
+
+  if ((pGMod != NULL) && (pGMod->gainOffsetPresent == 1)) {
+    /* *gainLin *= (float)pow(2.0, (double)(pGMod->gainOffset/6.0f)); */
+    gainDb_offset += FX_SGL2FX_DBL(pGMod->gainOffset) >> 4; /* resulting e: 8 */
+  }
+  if ((nodeMod->limiterPeakTargetPresent == 1) &&
+      (nodeMod->drcSetEffect ==
+       EB_CLIPPING)) { /* The only drcSetEffect is "clipping prevention" */
+    /* loudnessNormalizationGainModificationDb is included in
+     * loudnessNormalizationGainDb */
+    /* *gainLin *= (float)pow(2.0, max(0.0, -nodeModification->limiterPeakTarget
+     * - nodeModification->loudnessNormalizationGainDb)/6.0); */
+    gainDb_offset += fMax(
+        (FIXP_DBL)0,
+        (FX_SGL2FX_DBL(-nodeMod->limiterPeakTarget) >> 3) -
+            (nodeMod->loudnessNormalizationGainDb >> 1)); /* resulting e: 8 */
+  }
+  if (gainDb_offset != (FIXP_DBL)0) {
+    gainDb_out = fAddNorm(gainDb_modified, 7 + gainRatio_e + 1, gainDb_offset,
+                          8, &gainDb_out_e);
+  } else {
+    gainDb_out = gainDb_modified;
+    gainDb_out_e = 7 + gainRatio_e + 1;
+  }
+
+  /* *gainLin = (float)pow(2.0, (double)(gainDb_modified[1] / 6.0f)); */
+  gainLin_m = approxDb2lin(gainDb_out, gainDb_out_e, &gainLin_e);
+  *gainLin = scaleValueSaturate(gainLin_m, gainLin_e - 7);
+
+  /* *slopeLin = SLOPE_FACTOR_DB_TO_LINEAR * gainRatio * *gainLin * slopeDb; */
+  if (slopeDb == (FIXP_SGL)0) {
+    *slopeLin = (FIXP_DBL)0;
+  } else {
+    tmp_dbl =
+        fMult(slopeDb, SLOPE_FACTOR_DB_TO_LINEAR); /* resulting e: 2 - 3 = -1 */
+    tmp_dbl = fMult(tmp_dbl, gainRatio_m); /* resulting e: -1 + gainRatio_e */
+    if (gainDb_offset !=
+        (FIXP_DBL)0) { /* recalculate gainLin from gainDb that wasn't modified
+                          by gainOffset and limiterPeakTarget */
+      gainLin_m = approxDb2lin(gainDb_modified, 7 + gainRatio_e, &gainLin_e);
+    }
+    slopeLin_m = fMult(tmp_dbl, gainLin_m);
+    *slopeLin =
+        scaleValueSaturate(slopeLin_m, -1 + gainRatio_e + gainLin_e - 7);
+  }
+
+  if ((nodeMod->limiterPeakTargetPresent == 1) &&
+      (nodeMod->drcSetEffect == EB_CLIPPING)) {
+    if (*gainLin >= FL2FXCONST_DBL(1.0f / (float)(1 << 7))) {
+      *gainLin = FL2FXCONST_DBL(1.0f / (float)(1 << 7));
+      *slopeLin = (FIXP_DBL)0;
+    }
+  }
+
+  return DE_OK;
+}
+
+/* prepare buffers containing linear nodes for each gain sequence */
+DRC_ERROR
+prepareDrcGain(HANDLE_DRC_GAIN_DECODER hGainDec,
+               HANDLE_UNI_DRC_GAIN hUniDrcGain, const FIXP_SGL compress,
+               const FIXP_SGL boost, const FIXP_DBL loudnessNormalizationGainDb,
+               const int activeDrcIndex) {
+  int b, g, gainElementIndex;
+  DRC_GAIN_BUFFERS* drcGainBuffers = &(hGainDec->drcGainBuffers);
+  NODE_MODIFICATION nodeMod;
+  FDKmemclear(&nodeMod, sizeof(NODE_MODIFICATION));
+  ACTIVE_DRC* pActiveDrc = &(hGainDec->activeDrc[activeDrcIndex]);
+  DRC_INSTRUCTIONS_UNI_DRC* pInst = pActiveDrc->pInst;
+  if (pInst == NULL) return DE_NOT_OK;
+
+  nodeMod.drcSetEffect = pInst->drcSetEffect;
+
+  nodeMod.compress = compress;
+  nodeMod.boost = boost;
+  nodeMod.loudnessNormalizationGainDb = loudnessNormalizationGainDb;
+  nodeMod.limiterPeakTargetPresent = pInst->limiterPeakTargetPresent;
+  nodeMod.limiterPeakTarget = pInst->limiterPeakTarget;
+
+  gainElementIndex = 0;
+  for (g = 0; g < pInst->nDrcChannelGroups; g++) {
+    int gainSetIndex = 0;
+    int nDrcBands = 0;
+    DRC_COEFFICIENTS_UNI_DRC* pCoef = pActiveDrc->pCoef;
+    if (pCoef == NULL) return DE_NOT_OK;
+
+    if (!pActiveDrc->channelGroupIsParametricDrc[g]) {
+      gainSetIndex = pInst->gainSetIndexForChannelGroup[g];
+
+      if (nodeMod.drcSetEffect & (EB_DUCK_OTHER | EB_DUCK_SELF)) {
+        nodeMod.pDMod = &(pActiveDrc->duckingModificationForChannelGroup[g]);
+        nodeMod.pGMod = NULL;
+      } else {
+        nodeMod.pGMod = pInst->gainModificationForChannelGroup[g];
+        nodeMod.pDMod = NULL;
+      }
+
+      nDrcBands = pActiveDrc->bandCountForChannelGroup[g];
+      for (b = 0; b < nDrcBands; b++) {
+        DRC_ERROR err = DE_OK;
+        GAIN_SET* pGainSet = &(pCoef->gainSet[gainSetIndex]);
+        int seq = pGainSet->gainSequenceIndex[b];
+        DRC_CHARACTERISTIC* pDChar = &(pGainSet->drcCharacteristic[b]);
+
+        /* linearNodeBuffer contains a copy of the gain sequences (consisting of
+           nodes) that are relevant for decoding. It also contains gain
+           sequences of previous frames. */
+        LINEAR_NODE_BUFFER* pLnb =
+            &(drcGainBuffers->linearNodeBuffer[pActiveDrc->activeDrcOffset +
+                                               gainElementIndex]);
+        int i, lnbp;
+        lnbp = drcGainBuffers->lnbPointer;
+        pLnb->gainInterpolationType =
+            (GAIN_INTERPOLATION_TYPE)pGainSet->gainInterpolationType;
+
+        err = _prepareDrcCharacteristic(pDChar, pCoef, b, &nodeMod);
+        if (err) return err;
+
+        /* copy a node buffer and convert from dB to linear */
+        pLnb->nNodes[lnbp] = fMin((int)hUniDrcGain->nNodes[seq], 16);
+        for (i = 0; i < pLnb->nNodes[lnbp]; i++) {
+          FIXP_DBL gainLin, slopeLin;
+          err = _toLinear(&nodeMod, b, hUniDrcGain->gainNode[seq][i].gainDb,
+                          (FIXP_SGL)0, &gainLin, &slopeLin);
+          if (err) return err;
+          pLnb->linearNode[lnbp][i].gainLin = gainLin;
+          pLnb->linearNode[lnbp][i].time = hUniDrcGain->gainNode[seq][i].time;
+        }
+        gainElementIndex++;
+      }
+    } else {
+      /* parametric DRC not supported */
+      gainElementIndex++;
+    }
+  }
+  return DE_OK;
+}
diff --git a/libDRCdec/src/drcGainDec_preprocess.h b/libDRCdec/src/drcGainDec_preprocess.h
new file mode 100644
index 0000000..4647407
--- /dev/null
+++ b/libDRCdec/src/drcGainDec_preprocess.h
@@ -0,0 +1,111 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+#ifndef DRCGAINDEC_PREPROCESS_H
+#define DRCGAINDEC_PREPROCESS_H
+
+DRC_ERROR
+prepareDrcGain(HANDLE_DRC_GAIN_DECODER hGainDec,
+               HANDLE_UNI_DRC_GAIN hUniDrcGain, const FIXP_SGL compress,
+               const FIXP_SGL boost, const FIXP_DBL loudnessNormalizationGainDb,
+               const int activeDrcIndex);
+#endif
diff --git a/libDRCdec/src/drcGainDec_process.cpp b/libDRCdec/src/drcGainDec_process.cpp
new file mode 100644
index 0000000..70c9533
--- /dev/null
+++ b/libDRCdec/src/drcGainDec_process.cpp
@@ -0,0 +1,532 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+#include "drcDec_types.h"
+#include "drcDec_gainDecoder.h"
+#include "drcGainDec_process.h"
+
+#define E_TGAINSTEP 12
+
+static DRC_ERROR _prepareLnbIndex(ACTIVE_DRC* pActiveDrc,
+                                  const int channelOffset,
+                                  const int drcChannelOffset,
+                                  const int numChannelsProcessed,
+                                  const int lnbPointer) {
+  int g, c;
+  DRC_INSTRUCTIONS_UNI_DRC* pInst = pActiveDrc->pInst;
+
+  /* channelOffset: start index of physical channels
+     numChannelsProcessed: number of processed channels, physical channels and
+     DRC channels channelOffset + drcChannelOffset: start index of DRC channels,
+        i.e. the channel order referenced in pInst.sequenceIndex */
+
+  /* sanity checks */
+  if ((channelOffset + numChannelsProcessed) > 8) return DE_NOT_OK;
+
+  if ((channelOffset + drcChannelOffset + numChannelsProcessed) > 8)
+    return DE_NOT_OK;
+
+  if ((channelOffset + drcChannelOffset) < 0) return DE_NOT_OK;
+
+  /* prepare lnbIndexForChannel, a map of indices from each channel to its
+   * corresponding linearNodeBuffer instance */
+  for (c = channelOffset; c < channelOffset + numChannelsProcessed; c++) {
+    if (pInst->drcSetId > 0) {
+      int drcChannel = c + drcChannelOffset;
+      /* fallback for configuration with more physical channels than DRC
+         channels: reuse DRC gain of first channel. This is necessary for HE-AAC
+         mono with stereo output */
+      if (drcChannel >= pInst->drcChannelCount) drcChannel = 0;
+      g = pActiveDrc->channelGroupForChannel[drcChannel];
+      if ((g >= 0) && !pActiveDrc->channelGroupIsParametricDrc[g]) {
+        pActiveDrc->lnbIndexForChannel[c][lnbPointer] =
+            pActiveDrc->activeDrcOffset + pActiveDrc->gainElementForGroup[g];
+      }
+    }
+  }
+
+  return DE_OK;
+}
+
+static DRC_ERROR _interpolateDrcGain(
+    const GAIN_INTERPOLATION_TYPE gainInterpolationType,
+    const SHORT timePrev,  /* time0 */
+    const SHORT tGainStep, /* time1 - time0 */
+    const SHORT start, const SHORT stop, const SHORT stepsize,
+    const FIXP_DBL gainLeft, const FIXP_DBL gainRight, const FIXP_DBL slopeLeft,
+    const FIXP_DBL slopeRight, FIXP_DBL* buffer) {
+  int n, n_buf;
+  int start_modulo, start_offset;
+
+  if (tGainStep < 0) {
+    return DE_NOT_OK;
+  }
+  if (tGainStep == 0) {
+    return DE_OK;
+  }
+
+  /* get start index offset and buffer index for downsampled interpolation */
+  /* start_modulo = (start+timePrev)%stepsize; */ /* stepsize is a power of 2 */
+  start_modulo = (start + timePrev) & (stepsize - 1);
+  start_offset = (start_modulo ? stepsize - start_modulo : 0);
+  /* n_buf = (start + timePrev + start_offset)/stepsize; */
+  n_buf = (start + timePrev + start_offset) >> (15 - fixnormz_S(stepsize));
+
+  { /* gainInterpolationType == GIT_LINEAR */
+    LONG a;
+    /* runs = ceil((stop - start - start_offset)/stepsize). This works for
+     * stepsize = 2^N only. */
+    INT runs = (INT)(stop - start - start_offset + stepsize - 1) >>
+               (30 - CountLeadingBits(stepsize));
+    INT n_min = fMin(
+        fMin(CntLeadingZeros(gainRight), CntLeadingZeros(gainLeft)) - 1, 8);
+    a = (LONG)((gainRight << n_min) - (gainLeft << n_min)) / tGainStep;
+    LONG a_step = a * stepsize;
+    n = start + start_offset;
+    a = a * n + (LONG)(gainLeft << n_min);
+    buffer += n_buf;
+#if defined(FUNCTION_interpolateDrcGain_func1)
+    interpolateDrcGain_func1(buffer, a, a_step, n_min, runs);
+#else
+    a -= a_step;
+    n_min = 8 - n_min;
+    for (int i = 0; i < runs; i++) {
+      a += a_step;
+      buffer[i] = fMultDiv2(buffer[i], (FIXP_DBL)a) << n_min;
+    }
+#endif /* defined(FUNCTION_interpolateDrcGain_func1) */
+  }
+  return DE_OK;
+}
+
+static DRC_ERROR _processNodeSegments(
+    const int frameSize, const GAIN_INTERPOLATION_TYPE gainInterpolationType,
+    const int nNodes, const NODE_LIN* pNodeLin, const int offset,
+    const SHORT stepsize,
+    const NODE_LIN nodePrevious, /* the last node of the previous frame */
+    const FIXP_DBL channelGain, FIXP_DBL* buffer) {
+  DRC_ERROR err = DE_OK;
+  SHORT timePrev, duration, start, stop, time;
+  int n;
+  FIXP_DBL gainLin = FL2FXCONST_DBL(1.0f / (float)(1 << 7)), gainLinPrev;
+  FIXP_DBL slopeLin = (FIXP_DBL)0, slopeLinPrev = (FIXP_DBL)0;
+
+  timePrev = nodePrevious.time + offset;
+  gainLinPrev = nodePrevious.gainLin;
+  for (n = 0; n < nNodes; n++) {
+    time = pNodeLin[n].time + offset;
+    duration = time - timePrev;
+    gainLin = pNodeLin[n].gainLin;
+    if (channelGain != FL2FXCONST_DBL(1.0f / (float)(1 << 8)))
+      gainLin =
+          SATURATE_LEFT_SHIFT(fMultDiv2(gainLin, channelGain), 9, DFRACT_BITS);
+
+    if ((timePrev >= (frameSize - 1)) ||
+        (time < 0)) { /* This segment (between previous and current node) lies
+                         outside of this audio frame */
+      timePrev = time;
+      gainLinPrev = gainLin;
+      slopeLinPrev = slopeLin;
+      continue;
+    }
+
+    /* start and stop are the boundaries of the region of this segment that lie
+       within this audio frame. Their values are relative to the beginning of
+       this segment. stop is the first sample that isn't processed any more. */
+    start = fMax(-timePrev, 1);
+    stop = fMin(time, (SHORT)(frameSize - 1)) - timePrev + 1;
+
+    err = _interpolateDrcGain(gainInterpolationType, timePrev, duration, start,
+                              stop, stepsize, gainLinPrev, gainLin,
+                              slopeLinPrev, slopeLin, buffer);
+    if (err) return err;
+
+    timePrev = time;
+    gainLinPrev = gainLin;
+  }
+  return err;
+}
+
+/* process DRC on time-domain signal */
+DRC_ERROR
+processDrcTime(HANDLE_DRC_GAIN_DECODER hGainDec, const int activeDrcIndex,
+               const int delaySamples, const int channelOffset,
+               const int drcChannelOffset, const int numChannelsProcessed,
+               const int timeDataChannelOffset, FIXP_DBL* deinterleavedAudio) {
+  DRC_ERROR err = DE_OK;
+  int c, b, i;
+  ACTIVE_DRC* pActiveDrc = &(hGainDec->activeDrc[activeDrcIndex]);
+  DRC_GAIN_BUFFERS* pDrcGainBuffers = &(hGainDec->drcGainBuffers);
+  int lnbPointer = pDrcGainBuffers->lnbPointer, lnbIx;
+  LINEAR_NODE_BUFFER* pLinearNodeBuffer = pDrcGainBuffers->linearNodeBuffer;
+  LINEAR_NODE_BUFFER* pDummyLnb = &(pDrcGainBuffers->dummyLnb);
+  int offset = 0;
+
+  if (hGainDec->delayMode == DM_REGULAR_DELAY) {
+    offset = hGainDec->frameSize;
+  }
+
+  if ((delaySamples + offset) >
+      (NUM_LNB_FRAMES - 2) *
+          hGainDec->frameSize) /* if delaySamples is too big, NUM_LNB_FRAMES
+                                  should be increased */
+    return DE_NOT_OK;
+
+  err = _prepareLnbIndex(pActiveDrc, channelOffset, drcChannelOffset,
+                         numChannelsProcessed, lnbPointer);
+  if (err) return err;
+
+  deinterleavedAudio +=
+      channelOffset * timeDataChannelOffset; /* apply channelOffset */
+
+  /* signal processing loop */
+  for (c = channelOffset; c < channelOffset + numChannelsProcessed; c++) {
+    if (activeDrcIndex == hGainDec->channelGainActiveDrcIndex)
+      pDrcGainBuffers->channelGain[c][lnbPointer] = hGainDec->channelGain[c];
+
+    b = 0;
+    {
+      LINEAR_NODE_BUFFER *pLnb, *pLnbPrevious;
+      NODE_LIN nodePrevious;
+      int lnbPointerDiff;
+      FIXP_DBL channelGain;
+      /* get pointer to oldest linearNodes */
+      lnbIx = lnbPointer + 1 - NUM_LNB_FRAMES;
+      while (lnbIx < 0) lnbIx += NUM_LNB_FRAMES;
+
+      if (activeDrcIndex == hGainDec->channelGainActiveDrcIndex)
+        channelGain = pDrcGainBuffers->channelGain[c][lnbIx];
+      else
+        channelGain = FL2FXCONST_DBL(1.0f / (float)(1 << 8));
+
+      /* Loop over all node buffers in linearNodeBuffer.
+         All nodes which are not relevant for the current frame are sorted out
+         inside _processNodeSegments. */
+      for (i = 0; i < NUM_LNB_FRAMES - 1; i++) {
+        /* Prepare previous node */
+        if (pActiveDrc->lnbIndexForChannel[c][lnbIx] >= 0)
+          pLnbPrevious = &(
+              pLinearNodeBuffer[pActiveDrc->lnbIndexForChannel[c][lnbIx] + b]);
+        else
+          pLnbPrevious = pDummyLnb;
+        nodePrevious =
+            pLnbPrevious->linearNode[lnbIx][pLnbPrevious->nNodes[lnbIx] - 1];
+        nodePrevious.time -= hGainDec->frameSize;
+        if (channelGain != FL2FXCONST_DBL(1.0f / (float)(1 << 8)))
+          nodePrevious.gainLin = SATURATE_LEFT_SHIFT(
+              fMultDiv2(nodePrevious.gainLin,
+                        pDrcGainBuffers->channelGain[c][lnbIx]),
+              9, DFRACT_BITS);
+
+        /* Prepare current linearNodeBuffer instance */
+        lnbIx++;
+        if (lnbIx >= NUM_LNB_FRAMES) lnbIx = 0;
+
+        /* if lnbIndexForChannel changes over time, use the old indices for
+         * smooth transitions */
+        if (pActiveDrc->lnbIndexForChannel[c][lnbIx] >= 0)
+          pLnb = &(
+              pLinearNodeBuffer[pActiveDrc->lnbIndexForChannel[c][lnbIx] + b]);
+        else /* lnbIndexForChannel = -1 means "no DRC processing", due to
+                drcInstructionsIndex < 0, drcSetId < 0 or channel group < 0 */
+          pLnb = pDummyLnb;
+
+        if (activeDrcIndex == hGainDec->channelGainActiveDrcIndex)
+          channelGain = pDrcGainBuffers->channelGain[c][lnbIx];
+
+        /* number of frames of offset with respect to lnbPointer */
+        lnbPointerDiff = i - (NUM_LNB_FRAMES - 2);
+
+        err = _processNodeSegments(
+            hGainDec->frameSize, pLnb->gainInterpolationType,
+            pLnb->nNodes[lnbIx], pLnb->linearNode[lnbIx],
+            lnbPointerDiff * hGainDec->frameSize + delaySamples + offset, 1,
+            nodePrevious, channelGain, deinterleavedAudio);
+        if (err) return err;
+      }
+      deinterleavedAudio += timeDataChannelOffset; /* proceed to next channel */
+    }
+  }
+  return DE_OK;
+}
+
+/* process DRC on subband-domain signal */
+DRC_ERROR
+processDrcSubband(HANDLE_DRC_GAIN_DECODER hGainDec, const int activeDrcIndex,
+                  const int delaySamples, const int channelOffset,
+                  const int drcChannelOffset, const int numChannelsProcessed,
+                  const int processSingleTimeslot,
+                  FIXP_DBL* deinterleavedAudioReal[],
+                  FIXP_DBL* deinterleavedAudioImag[]) {
+  DRC_ERROR err = DE_OK;
+  int b, c, g, m, m_start, m_stop, s, i;
+  FIXP_DBL gainSb;
+  DRC_INSTRUCTIONS_UNI_DRC* pInst = hGainDec->activeDrc[activeDrcIndex].pInst;
+  DRC_GAIN_BUFFERS* pDrcGainBuffers = &(hGainDec->drcGainBuffers);
+  ACTIVE_DRC* pActiveDrc = &(hGainDec->activeDrc[activeDrcIndex]);
+  int activeDrcOffset = pActiveDrc->activeDrcOffset;
+  int lnbPointer = pDrcGainBuffers->lnbPointer, lnbIx;
+  LINEAR_NODE_BUFFER* pLinearNodeBuffer = pDrcGainBuffers->linearNodeBuffer;
+  FIXP_DBL(*subbandGains)[4 * 1024 / 256] = hGainDec->subbandGains;
+  FIXP_DBL* dummySubbandGains = hGainDec->dummySubbandGains;
+  SUBBAND_DOMAIN_MODE subbandDomainMode = hGainDec->subbandDomainSupported;
+  int signalIndex = 0;
+  int frameSizeSb = 0;
+  int nDecoderSubbands;
+  SHORT L = 0; /* L: downsampling factor */
+  int offset = 0;
+  FIXP_DBL *audioReal = NULL, *audioImag = NULL;
+
+  if (hGainDec->delayMode == DM_REGULAR_DELAY) {
+    offset = hGainDec->frameSize;
+  }
+
+  if ((delaySamples + offset) >
+      (NUM_LNB_FRAMES - 2) *
+          hGainDec->frameSize) /* if delaySamples is too big, NUM_LNB_FRAMES
+                                  should be increased */
+    return DE_NOT_OK;
+
+  switch (subbandDomainMode) {
+#if ((1024 / 256) >= (4096 / SUBBAND_DOWNSAMPLING_FACTOR_QMF64))
+    case SDM_QMF64:
+      nDecoderSubbands = SUBBAND_NUM_BANDS_QMF64;
+      L = SUBBAND_DOWNSAMPLING_FACTOR_QMF64;
+      /* analysisDelay = SUBBAND_ANALYSIS_DELAY_QMF64; */
+      break;
+    case SDM_QMF71:
+      nDecoderSubbands = SUBBAND_NUM_BANDS_QMF71;
+      L = SUBBAND_DOWNSAMPLING_FACTOR_QMF71;
+      /* analysisDelay = SUBBAND_ANALYSIS_DELAY_QMF71; */
+      break;
+#else
+    case SDM_QMF64:
+    case SDM_QMF71:
+      /* QMF domain processing is not supported. */
+      return DE_NOT_OK;
+#endif
+    case SDM_STFT256:
+      nDecoderSubbands = SUBBAND_NUM_BANDS_STFT256;
+      L = SUBBAND_DOWNSAMPLING_FACTOR_STFT256;
+      /* analysisDelay = SUBBAND_ANALYSIS_DELAY_STFT256; */
+      break;
+    default:
+      return DE_NOT_OK;
+  }
+
+  /* frameSizeSb = hGainDec->frameSize/L; */ /* L is a power of 2 */
+  frameSizeSb =
+      hGainDec->frameSize >> (15 - fixnormz_S(L)); /* timeslots per frame */
+
+  if ((processSingleTimeslot < 0) || (processSingleTimeslot >= frameSizeSb)) {
+    m_start = 0;
+    m_stop = frameSizeSb;
+  } else {
+    m_start = processSingleTimeslot;
+    m_stop = m_start + 1;
+  }
+
+  err = _prepareLnbIndex(pActiveDrc, channelOffset, drcChannelOffset,
+                         numChannelsProcessed, lnbPointer);
+  if (err) return err;
+
+  if (!pActiveDrc->subbandGainsReady) /* only for the first time per frame that
+                                         processDrcSubband is called */
+  {
+    /* write subbandGains */
+    for (g = 0; g < pInst->nDrcChannelGroups; g++) {
+      b = 0;
+      {
+        LINEAR_NODE_BUFFER* pLnb =
+            &(pLinearNodeBuffer[activeDrcOffset +
+                                pActiveDrc->gainElementForGroup[g] + b]);
+        NODE_LIN nodePrevious;
+        int lnbPointerDiff;
+
+        for (m = 0; m < frameSizeSb; m++) {
+          subbandGains[activeDrcOffset + g][b * frameSizeSb + m] =
+              FL2FXCONST_DBL(1.0f / (float)(1 << 7));
+        }
+
+        lnbIx = lnbPointer - (NUM_LNB_FRAMES - 1);
+        while (lnbIx < 0) lnbIx += NUM_LNB_FRAMES;
+
+        /* Loop over all node buffers in linearNodeBuffer.
+           All nodes which are not relevant for the current frame are sorted out
+           inside _processNodeSegments. */
+        for (i = 0; i < NUM_LNB_FRAMES - 1; i++) {
+          /* Prepare previous node */
+          nodePrevious = pLnb->linearNode[lnbIx][pLnb->nNodes[lnbIx] - 1];
+          nodePrevious.time -= hGainDec->frameSize;
+
+          lnbIx++;
+          if (lnbIx >= NUM_LNB_FRAMES) lnbIx = 0;
+
+          /* number of frames of offset with respect to lnbPointer */
+          lnbPointerDiff = i - (NUM_LNB_FRAMES - 2);
+
+          err = _processNodeSegments(
+              hGainDec->frameSize, pLnb->gainInterpolationType,
+              pLnb->nNodes[lnbIx], pLnb->linearNode[lnbIx],
+              lnbPointerDiff * hGainDec->frameSize + delaySamples + offset -
+                  (L - 1) / 2,
+              L, nodePrevious, FL2FXCONST_DBL(1.0f / (float)(1 << 8)),
+              &(subbandGains[activeDrcOffset + g][b * frameSizeSb]));
+          if (err) return err;
+        }
+      }
+    }
+    pActiveDrc->subbandGainsReady = 1;
+  }
+
+  for (c = channelOffset; c < channelOffset + numChannelsProcessed; c++) {
+    FIXP_DBL* thisSubbandGainsBuffer;
+    if (pInst->drcSetId > 0)
+      g = pActiveDrc->channelGroupForChannel[c + drcChannelOffset];
+    else
+      g = -1;
+
+    audioReal = deinterleavedAudioReal[signalIndex];
+    if (subbandDomainMode != SDM_STFT256) {
+      audioImag = deinterleavedAudioImag[signalIndex];
+    }
+
+    if ((g >= 0) && !pActiveDrc->channelGroupIsParametricDrc[g]) {
+      thisSubbandGainsBuffer = subbandGains[activeDrcOffset + g];
+    } else {
+      thisSubbandGainsBuffer = dummySubbandGains;
+    }
+
+    for (m = m_start; m < m_stop; m++) {
+      INT n_min = 8;
+      { /* single-band DRC */
+        gainSb = thisSubbandGainsBuffer[m];
+        if (activeDrcIndex == hGainDec->channelGainActiveDrcIndex)
+          gainSb = SATURATE_LEFT_SHIFT(
+              fMultDiv2(gainSb, hGainDec->channelGain[c]), 9, DFRACT_BITS);
+        /* normalize gainSb for keeping signal precision */
+        n_min = fMin(CntLeadingZeros(gainSb) - 1, n_min);
+        gainSb <<= n_min;
+        n_min = 8 - n_min;
+        if (subbandDomainMode ==
+            SDM_STFT256) { /* For STFT filterbank, real and imaginary parts are
+                              interleaved. */
+          for (s = 0; s < nDecoderSubbands; s++) {
+            *audioReal = fMultDiv2(*audioReal, gainSb) << n_min;
+            audioReal++;
+            *audioReal = fMultDiv2(*audioReal, gainSb) << n_min;
+            audioReal++;
+          }
+        } else {
+          for (s = 0; s < nDecoderSubbands; s++) {
+            *audioReal = fMultDiv2(*audioReal, gainSb) << n_min;
+            audioReal++;
+            *audioImag = fMultDiv2(*audioImag, gainSb) << n_min;
+            audioImag++;
+          }
+        }
+      }
+    }
+    signalIndex++;
+  }
+  return DE_OK;
+}
diff --git a/libDRCdec/src/drcGainDec_process.h b/libDRCdec/src/drcGainDec_process.h
new file mode 100644
index 0000000..f751aba
--- /dev/null
+++ b/libDRCdec/src/drcGainDec_process.h
@@ -0,0 +1,119 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+#ifndef DRCGAINDEC_PROCESS_H
+#define DRCGAINDEC_PROCESS_H
+
+DRC_ERROR
+processDrcTime(HANDLE_DRC_GAIN_DECODER hGainDec, const int activeDrcIndex,
+               const int delaySamples, const int channelOffset,
+               const int drcChannelOffset, const int numChannelsProcessed,
+               const int timeDataChannelOffset, FIXP_DBL* deinterleavedAudio);
+
+DRC_ERROR
+processDrcSubband(HANDLE_DRC_GAIN_DECODER hGainDec, const int activeDrcIndex,
+                  const int delaySamples, const int channelOffset,
+                  const int drcChannelOffset, const int numChannelsProcessed,
+                  const int processSingleTimeslot,
+                  FIXP_DBL* deinterleavedAudioReal[],
+                  FIXP_DBL* deinterleavedAudioImag[]);
+#endif
author	Fraunhofer IIS FDK <audio-fdk@iis.fraunhofer.de>	2018-02-26 20:17:00 +0100
committer	Jean-Michel Trivi <jmtrivi@google.com>	2018-04-19 11:21:15 -0700
commit	6cfabd35363c3ef5e3b209b867169a500b3ccc3c (patch)
tree	01c0a19f2735e8b5d2407555fe992d4230d089eb /libDRCdec
parent	6288a1e34c4dede4c2806beb1736ece6580558c7 (diff)
download	aac-6cfabd35363c3ef5e3b209b867169a500b3ccc3c.tar.gz