digital_agc.h - mozsearch

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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 MODULES_AUDIO_PROCESSING_AGC_LEGACY_DIGITAL_AGC_H_

#define MODULES_AUDIO_PROCESSING_AGC_LEGACY_DIGITAL_AGC_H_

#include "common_audio/signal_processing/include/signal_processing_library.h"

namespace webrtc {

typedef struct {

  int32_t downState[8];

  int16_t HPstate;

  int16_t counter;

  int16_t logRatio;           // log( P(active) / P(inactive) ) (Q10)

  int16_t meanLongTerm;       // Q10

  int32_t varianceLongTerm;   // Q8

  int16_t stdLongTerm;        // Q10

  int16_t meanShortTerm;      // Q10

  int32_t varianceShortTerm;  // Q8

  int16_t stdShortTerm;       // Q10

} AgcVad;                     // total = 54 bytes

typedef struct {

  int32_t capacitorSlow;

  int32_t capacitorFast;

  int32_t gain;

  int32_t gainTable[32];

  int16_t gatePrevious;

  int16_t agcMode;

  AgcVad vadNearend;

  AgcVad vadFarend;

} DigitalAgc;

int32_t WebRtcAgc_InitDigital(DigitalAgc* digitalAgcInst, int16_t agcMode);

int32_t WebRtcAgc_ComputeDigitalGains(DigitalAgc* digitalAgcInst,

                                      const int16_t* const* inNear,

                                      size_t num_bands,

                                      uint32_t FS,

                                      int16_t lowLevelSignal,

                                      int32_t gains[11]);

int32_t WebRtcAgc_ApplyDigitalGains(const int32_t gains[11],

                                    size_t num_bands,

                                    uint32_t FS,

                                    const int16_t* const* in_near,

                                    int16_t* const* out);

int32_t WebRtcAgc_AddFarendToDigital(DigitalAgc* digitalAgcInst,

                                     const int16_t* inFar,

                                     size_t nrSamples);

void WebRtcAgc_InitVad(AgcVad* vadInst);

int16_t WebRtcAgc_ProcessVad(AgcVad* vadInst,    // (i) VAD state

                             const int16_t* in,  // (i) Speech signal

                             size_t nrSamples);  // (i) number of samples

int32_t WebRtcAgc_CalculateGainTable(int32_t* gainTable,         // Q16

                                     int16_t compressionGaindB,  // Q0 (in dB)

                                     int16_t targetLevelDbfs,    // Q0 (in dB)

                                     uint8_t limiterEnable,

                                     int16_t analogTarget);

}  // namespace webrtc

#endif  // MODULES_AUDIO_PROCESSING_AGC_LEGACY_DIGITAL_AGC_H_