summaryrefslogtreecommitdiff
path: root/libDRCdec/src/drcDec_tools.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'libDRCdec/src/drcDec_tools.cpp')
-rw-r--r--libDRCdec/src/drcDec_tools.cpp371
1 files changed, 371 insertions, 0 deletions
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;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-27 05:57:51 +0000