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/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AGC_MAIN_SOURCE_DIGITAL_AGC_H_
#define WEBRTC_MODULES_AUDIO_PROCESSING_AGC_MAIN_SOURCE_DIGITAL_AGC_H_
#ifdef AGC_DEBUG
#include <stdio.h>
#endif
#include "typedefs.h"
#include "signal_processing_library.h"
// the 32 most significant bits of A(19) * B(26) >> 13
#define AGC_MUL32(A, B) (((B)>>13)*(A) + ( ((0x00001FFF & (B))*(A)) >> 13 ))
// C + the 32 most significant bits of A * B
#define AGC_SCALEDIFF32(A, B, C) ((C) + ((B)>>16)*(A) + ( ((0x0000FFFF & (B))*(A)) >> 16 ))
typedef struct
{
WebRtc_Word32 downState[8];
WebRtc_Word16 HPstate;
WebRtc_Word16 counter;
WebRtc_Word16 logRatio; // log( P(active) / P(inactive) ) (Q10)
WebRtc_Word16 meanLongTerm; // Q10
WebRtc_Word32 varianceLongTerm; // Q8
WebRtc_Word16 stdLongTerm; // Q10
WebRtc_Word16 meanShortTerm; // Q10
WebRtc_Word32 varianceShortTerm; // Q8
WebRtc_Word16 stdShortTerm; // Q10
} AgcVad_t; // total = 54 bytes
typedef struct
{
WebRtc_Word32 capacitorSlow;
WebRtc_Word32 capacitorFast;
WebRtc_Word32 gain;
WebRtc_Word32 gainTable[32];
WebRtc_Word16 gatePrevious;
WebRtc_Word16 agcMode;
AgcVad_t vadNearend;
AgcVad_t vadFarend;
#ifdef AGC_DEBUG
FILE* logFile;
int frameCounter;
#endif
} DigitalAgc_t;
WebRtc_Word32 WebRtcAgc_InitDigital(DigitalAgc_t *digitalAgcInst, WebRtc_Word16 agcMode);
WebRtc_Word32 WebRtcAgc_ProcessDigital(DigitalAgc_t *digitalAgcInst, const WebRtc_Word16 *inNear,
const WebRtc_Word16 *inNear_H, WebRtc_Word16 *out,
WebRtc_Word16 *out_H, WebRtc_UWord32 FS,
WebRtc_Word16 lowLevelSignal);
WebRtc_Word32 WebRtcAgc_AddFarendToDigital(DigitalAgc_t *digitalAgcInst, const WebRtc_Word16 *inFar,
WebRtc_Word16 nrSamples);
void WebRtcAgc_InitVad(AgcVad_t *vadInst);
WebRtc_Word16 WebRtcAgc_ProcessVad(AgcVad_t *vadInst, // (i) VAD state
const WebRtc_Word16 *in, // (i) Speech signal
WebRtc_Word16 nrSamples); // (i) number of samples
WebRtc_Word32 WebRtcAgc_CalculateGainTable(WebRtc_Word32 *gainTable, // Q16
WebRtc_Word16 compressionGaindB, // Q0 (in dB)
WebRtc_Word16 targetLevelDbfs,// Q0 (in dB)
WebRtc_UWord8 limiterEnable, WebRtc_Word16 analogTarget);
#endif // WEBRTC_MODULES_AUDIO_PROCESSING_AGC_MAIN_SOURCE_ANALOG_AGC_H_
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