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
