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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 AGC_DEBUG
     15 #include <stdio.h>
     16 #endif
     17 #include "typedefs.h"
     18 #include "signal_processing_library.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     WebRtc_Word32 downState[8];
     28     WebRtc_Word16 HPstate;
     29     WebRtc_Word16 counter;
     30     WebRtc_Word16 logRatio; // log( P(active) / P(inactive) ) (Q10)
     31     WebRtc_Word16 meanLongTerm; // Q10
     32     WebRtc_Word32 varianceLongTerm; // Q8
     33     WebRtc_Word16 stdLongTerm; // Q10
     34     WebRtc_Word16 meanShortTerm; // Q10
     35     WebRtc_Word32 varianceShortTerm; // Q8
     36     WebRtc_Word16 stdShortTerm; // Q10
     37 } AgcVad_t; // total = 54 bytes
     38 
     39 typedef struct
     40 {
     41     WebRtc_Word32 capacitorSlow;
     42     WebRtc_Word32 capacitorFast;
     43     WebRtc_Word32 gain;
     44     WebRtc_Word32 gainTable[32];
     45     WebRtc_Word16 gatePrevious;
     46     WebRtc_Word16 agcMode;
     47     AgcVad_t      vadNearend;
     48     AgcVad_t      vadFarend;
     49 #ifdef AGC_DEBUG
     50     FILE*         logFile;
     51     int           frameCounter;
     52 #endif
     53 } DigitalAgc_t;
     54 
     55 WebRtc_Word32 WebRtcAgc_InitDigital(DigitalAgc_t *digitalAgcInst, WebRtc_Word16 agcMode);
     56 
     57 WebRtc_Word32 WebRtcAgc_ProcessDigital(DigitalAgc_t *digitalAgcInst, const WebRtc_Word16 *inNear,
     58                              const WebRtc_Word16 *inNear_H, WebRtc_Word16 *out,
     59                              WebRtc_Word16 *out_H, WebRtc_UWord32 FS,
     60                              WebRtc_Word16 lowLevelSignal);
     61 
     62 WebRtc_Word32 WebRtcAgc_AddFarendToDigital(DigitalAgc_t *digitalAgcInst, const WebRtc_Word16 *inFar,
     63                                  WebRtc_Word16 nrSamples);
     64 
     65 void WebRtcAgc_InitVad(AgcVad_t *vadInst);
     66 
     67 WebRtc_Word16 WebRtcAgc_ProcessVad(AgcVad_t *vadInst, // (i) VAD state
     68                             const WebRtc_Word16 *in, // (i) Speech signal
     69                             WebRtc_Word16 nrSamples); // (i) number of samples
     70 
     71 WebRtc_Word32 WebRtcAgc_CalculateGainTable(WebRtc_Word32 *gainTable, // Q16
     72                                  WebRtc_Word16 compressionGaindB, // Q0 (in dB)
     73                                  WebRtc_Word16 targetLevelDbfs,// Q0 (in dB)
     74                                  WebRtc_UWord8 limiterEnable, WebRtc_Word16 analogTarget);
     75 
     76 #endif // WEBRTC_MODULES_AUDIO_PROCESSING_AGC_MAIN_SOURCE_ANALOG_AGC_H_
     77