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
