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_ANALOG_AGC_H_ 12 #define WEBRTC_MODULES_AUDIO_PROCESSING_AGC_MAIN_SOURCE_ANALOG_AGC_H_ 13 14 #include "digital_agc.h" 15 #include "include/gain_control.h" 16 17 #include <stdint.h> 18 19 //#define MIC_LEVEL_FEEDBACK 20 #ifdef WEBRTC_AGC_DEBUG_DUMP 21 #include <stdio.h> 22 #endif 23 24 /* Analog Automatic Gain Control variables: 25 * Constant declarations (inner limits inside which no changes are done) 26 * In the beginning the range is narrower to widen as soon as the measure 27 * 'Rxx160_LP' is inside it. Currently the starting limits are -22.2+/-1dBm0 28 * and the final limits -22.2+/-2.5dBm0. These levels makes the speech signal 29 * go towards -25.4dBm0 (-31.4dBov). Tuned with wbfile-31.4dBov.pcm 30 * The limits are created by running the AGC with a file having the desired 31 * signal level and thereafter plotting Rxx160_LP in the dBm0-domain defined 32 * by out=10*log10(in/260537279.7); Set the target level to the average level 33 * of our measure Rxx160_LP. Remember that the levels are in blocks of 16 in 34 * Q(-7). (Example matlab code: round(db2pow(-21.2)*16/2^7) ) 35 */ 36 #define RXX_BUFFER_LEN 10 37 38 static const int16_t kMsecSpeechInner = 520; 39 static const int16_t kMsecSpeechOuter = 340; 40 41 static const int16_t kNormalVadThreshold = 400; 42 43 static const int16_t kAlphaShortTerm = 6; // 1 >> 6 = 0.0156 44 static const int16_t kAlphaLongTerm = 10; // 1 >> 10 = 0.000977 45 46 typedef struct 47 { 48 // Configurable parameters/variables 49 uint32_t fs; // Sampling frequency 50 int16_t compressionGaindB; // Fixed gain level in dB 51 int16_t targetLevelDbfs; // Target level in -dBfs of envelope (default -3) 52 int16_t agcMode; // Hard coded mode (adaptAna/adaptDig/fixedDig) 53 uint8_t limiterEnable; // Enabling limiter (on/off (default off)) 54 WebRtcAgc_config_t defaultConfig; 55 WebRtcAgc_config_t usedConfig; 56 57 // General variables 58 int16_t initFlag; 59 int16_t lastError; 60 61 // Target level parameters 62 // Based on the above: analogTargetLevel = round((32767*10^(-22/20))^2*16/2^7) 63 int32_t analogTargetLevel; // = RXX_BUFFER_LEN * 846805; -22 dBfs 64 int32_t startUpperLimit; // = RXX_BUFFER_LEN * 1066064; -21 dBfs 65 int32_t startLowerLimit; // = RXX_BUFFER_LEN * 672641; -23 dBfs 66 int32_t upperPrimaryLimit; // = RXX_BUFFER_LEN * 1342095; -20 dBfs 67 int32_t lowerPrimaryLimit; // = RXX_BUFFER_LEN * 534298; -24 dBfs 68 int32_t upperSecondaryLimit;// = RXX_BUFFER_LEN * 2677832; -17 dBfs 69 int32_t lowerSecondaryLimit;// = RXX_BUFFER_LEN * 267783; -27 dBfs 70 uint16_t targetIdx; // Table index for corresponding target level 71 #ifdef MIC_LEVEL_FEEDBACK 72 uint16_t targetIdxOffset; // Table index offset for level compensation 73 #endif 74 int16_t analogTarget; // Digital reference level in ENV scale 75 76 // Analog AGC specific variables 77 int32_t filterState[8]; // For downsampling wb to nb 78 int32_t upperLimit; // Upper limit for mic energy 79 int32_t lowerLimit; // Lower limit for mic energy 80 int32_t Rxx160w32; // Average energy for one frame 81 int32_t Rxx16_LPw32; // Low pass filtered subframe energies 82 int32_t Rxx160_LPw32; // Low pass filtered frame energies 83 int32_t Rxx16_LPw32Max; // Keeps track of largest energy subframe 84 int32_t Rxx16_vectorw32[RXX_BUFFER_LEN];// Array with subframe energies 85 int32_t Rxx16w32_array[2][5];// Energy values of microphone signal 86 int32_t env[2][10]; // Envelope values of subframes 87 88 int16_t Rxx16pos; // Current position in the Rxx16_vectorw32 89 int16_t envSum; // Filtered scaled envelope in subframes 90 int16_t vadThreshold; // Threshold for VAD decision 91 int16_t inActive; // Inactive time in milliseconds 92 int16_t msTooLow; // Milliseconds of speech at a too low level 93 int16_t msTooHigh; // Milliseconds of speech at a too high level 94 int16_t changeToSlowMode; // Change to slow mode after some time at target 95 int16_t firstCall; // First call to the process-function 96 int16_t msZero; // Milliseconds of zero input 97 int16_t msecSpeechOuterChange;// Min ms of speech between volume changes 98 int16_t msecSpeechInnerChange;// Min ms of speech between volume changes 99 int16_t activeSpeech; // Milliseconds of active speech 100 int16_t muteGuardMs; // Counter to prevent mute action 101 int16_t inQueue; // 10 ms batch indicator 102 103 // Microphone level variables 104 int32_t micRef; // Remember ref. mic level for virtual mic 105 uint16_t gainTableIdx; // Current position in virtual gain table 106 int32_t micGainIdx; // Gain index of mic level to increase slowly 107 int32_t micVol; // Remember volume between frames 108 int32_t maxLevel; // Max possible vol level, incl dig gain 109 int32_t maxAnalog; // Maximum possible analog volume level 110 int32_t maxInit; // Initial value of "max" 111 int32_t minLevel; // Minimum possible volume level 112 int32_t minOutput; // Minimum output volume level 113 int32_t zeroCtrlMax; // Remember max gain => don't amp low input 114 int32_t lastInMicLevel; 115 116 int16_t scale; // Scale factor for internal volume levels 117 #ifdef MIC_LEVEL_FEEDBACK 118 int16_t numBlocksMicLvlSat; 119 uint8_t micLvlSat; 120 #endif 121 // Structs for VAD and digital_agc 122 AgcVad_t vadMic; 123 DigitalAgc_t digitalAgc; 124 125 #ifdef WEBRTC_AGC_DEBUG_DUMP 126 FILE* fpt; 127 FILE* agcLog; 128 int32_t fcount; 129 #endif 130 131 int16_t lowLevelSignal; 132 } Agc_t; 133 134 #endif // WEBRTC_MODULES_AUDIO_PROCESSING_AGC_MAIN_SOURCE_ANALOG_AGC_H_ 135