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      1 /*
      2  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 
     11 #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AGC_MAIN_SOURCE_DIGITAL_AGC_H_
     12 #define WEBRTC_MODULES_AUDIO_PROCESSING_AGC_MAIN_SOURCE_DIGITAL_AGC_H_
     13 
     14 #ifdef WEBRTC_AGC_DEBUG_DUMP
     15 #include <stdio.h>
     16 #endif
     17 #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
     18 #include "webrtc/typedefs.h"
     19 
     20 // the 32 most significant bits of A(19) * B(26) >> 13
     21 #define AGC_MUL32(A, B)             (((B)>>13)*(A) + ( ((0x00001FFF & (B))*(A)) >> 13 ))
     22 // C + the 32 most significant bits of A * B
     23 #define AGC_SCALEDIFF32(A, B, C)    ((C) + ((B)>>16)*(A) + ( ((0x0000FFFF & (B))*(A)) >> 16 ))
     24 
     25 typedef struct
     26 {
     27     int32_t downState[8];
     28     int16_t HPstate;
     29     int16_t counter;
     30     int16_t logRatio; // log( P(active) / P(inactive) ) (Q10)
     31     int16_t meanLongTerm; // Q10
     32     int32_t varianceLongTerm; // Q8
     33     int16_t stdLongTerm; // Q10
     34     int16_t meanShortTerm; // Q10
     35     int32_t varianceShortTerm; // Q8
     36     int16_t stdShortTerm; // Q10
     37 } AgcVad_t; // total = 54 bytes
     38 
     39 typedef struct
     40 {
     41     int32_t capacitorSlow;
     42     int32_t capacitorFast;
     43     int32_t gain;
     44     int32_t gainTable[32];
     45     int16_t gatePrevious;
     46     int16_t agcMode;
     47     AgcVad_t      vadNearend;
     48     AgcVad_t      vadFarend;
     49 #ifdef WEBRTC_AGC_DEBUG_DUMP
     50     FILE* logFile;
     51     int frameCounter;
     52 #endif
     53 } DigitalAgc_t;
     54 
     55 int32_t WebRtcAgc_InitDigital(DigitalAgc_t *digitalAgcInst, int16_t agcMode);
     56 
     57 int32_t WebRtcAgc_ProcessDigital(DigitalAgc_t *digitalAgcInst,
     58                                  const int16_t *inNear, const int16_t *inNear_H,
     59                                  int16_t *out, int16_t *out_H, uint32_t FS,
     60                                  int16_t lowLevelSignal);
     61 
     62 int32_t WebRtcAgc_AddFarendToDigital(DigitalAgc_t *digitalAgcInst,
     63                                      const int16_t *inFar,
     64                                      int16_t nrSamples);
     65 
     66 void WebRtcAgc_InitVad(AgcVad_t *vadInst);
     67 
     68 int16_t WebRtcAgc_ProcessVad(AgcVad_t *vadInst, // (i) VAD state
     69                              const int16_t *in, // (i) Speech signal
     70                              int16_t nrSamples); // (i) number of samples
     71 
     72 int32_t WebRtcAgc_CalculateGainTable(int32_t *gainTable, // Q16
     73                                      int16_t compressionGaindB, // Q0 (in dB)
     74                                      int16_t targetLevelDbfs,// Q0 (in dB)
     75                                      uint8_t limiterEnable,
     76                                      int16_t analogTarget);
     77 
     78 #endif // WEBRTC_MODULES_AUDIO_PROCESSING_AGC_MAIN_SOURCE_ANALOG_AGC_H_
     79