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Diffstat (limited to 'third_party/libwebrtc/modules/audio_processing/agc/legacy/analog_agc.h')
| -rw-r--r-- | third_party/libwebrtc/modules/audio_processing/agc/legacy/analog_agc.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/audio_processing/agc/legacy/analog_agc.h b/third_party/libwebrtc/modules/audio_processing/agc/legacy/analog_agc.h new file mode 100644 index 0000000000..7a231c8a64 --- /dev/null +++ b/third_party/libwebrtc/modules/audio_processing/agc/legacy/analog_agc.h @@ -0,0 +1,117 @@ +/* + * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +#ifndef MODULES_AUDIO_PROCESSING_AGC_LEGACY_ANALOG_AGC_H_ +#define MODULES_AUDIO_PROCESSING_AGC_LEGACY_ANALOG_AGC_H_ + +#include "modules/audio_processing/agc/legacy/digital_agc.h" +#include "modules/audio_processing/agc/legacy/gain_control.h" + +namespace webrtc { + +/* Analog Automatic Gain Control variables: + * Constant declarations (inner limits inside which no changes are done) + * In the beginning the range is narrower to widen as soon as the measure + * 'Rxx160_LP' is inside it. Currently the starting limits are -22.2+/-1dBm0 + * and the final limits -22.2+/-2.5dBm0. These levels makes the speech signal + * go towards -25.4dBm0 (-31.4dBov). Tuned with wbfile-31.4dBov.pcm + * The limits are created by running the AGC with a file having the desired + * signal level and thereafter plotting Rxx160_LP in the dBm0-domain defined + * by out=10*log10(in/260537279.7); Set the target level to the average level + * of our measure Rxx160_LP. Remember that the levels are in blocks of 16 in + * Q(-7). (Example matlab code: round(db2pow(-21.2)*16/2^7) ) + */ +constexpr int16_t kRxxBufferLen = 10; + +static const int16_t kMsecSpeechInner = 520; +static const int16_t kMsecSpeechOuter = 340; + +static const int16_t kNormalVadThreshold = 400; + +static const int16_t kAlphaShortTerm = 6; // 1 >> 6 = 0.0156 +static const int16_t kAlphaLongTerm = 10; // 1 >> 10 = 0.000977 + +typedef struct { + // Configurable parameters/variables + uint32_t fs; // Sampling frequency + int16_t compressionGaindB; // Fixed gain level in dB + int16_t targetLevelDbfs; // Target level in -dBfs of envelope (default -3) + int16_t agcMode; // Hard coded mode (adaptAna/adaptDig/fixedDig) + uint8_t limiterEnable; // Enabling limiter (on/off (default off)) + WebRtcAgcConfig defaultConfig; + WebRtcAgcConfig usedConfig; + + // General variables + int16_t initFlag; + int16_t lastError; + + // Target level parameters + // Based on the above: analogTargetLevel = round((32767*10^(-22/20))^2*16/2^7) + int32_t analogTargetLevel; // = kRxxBufferLen * 846805; -22 dBfs + int32_t startUpperLimit; // = kRxxBufferLen * 1066064; -21 dBfs + int32_t startLowerLimit; // = kRxxBufferLen * 672641; -23 dBfs + int32_t upperPrimaryLimit; // = kRxxBufferLen * 1342095; -20 dBfs + int32_t lowerPrimaryLimit; // = kRxxBufferLen * 534298; -24 dBfs + int32_t upperSecondaryLimit; // = kRxxBufferLen * 2677832; -17 dBfs + int32_t lowerSecondaryLimit; // = kRxxBufferLen * 267783; -27 dBfs + uint16_t targetIdx; // Table index for corresponding target level + int16_t analogTarget; // Digital reference level in ENV scale + + // Analog AGC specific variables + int32_t filterState[8]; // For downsampling wb to nb + int32_t upperLimit; // Upper limit for mic energy + int32_t lowerLimit; // Lower limit for mic energy + int32_t Rxx160w32; // Average energy for one frame + int32_t Rxx16_LPw32; // Low pass filtered subframe energies + int32_t Rxx160_LPw32; // Low pass filtered frame energies + int32_t Rxx16_LPw32Max; // Keeps track of largest energy subframe + int32_t Rxx16_vectorw32[kRxxBufferLen]; // Array with subframe energies + int32_t Rxx16w32_array[2][5]; // Energy values of microphone signal + int32_t env[2][10]; // Envelope values of subframes + + int16_t Rxx16pos; // Current position in the Rxx16_vectorw32 + int16_t envSum; // Filtered scaled envelope in subframes + int16_t vadThreshold; // Threshold for VAD decision + int16_t inActive; // Inactive time in milliseconds + int16_t msTooLow; // Milliseconds of speech at a too low level + int16_t msTooHigh; // Milliseconds of speech at a too high level + int16_t changeToSlowMode; // Change to slow mode after some time at target + int16_t firstCall; // First call to the process-function + int16_t msZero; // Milliseconds of zero input + int16_t msecSpeechOuterChange; // Min ms of speech between volume changes + int16_t msecSpeechInnerChange; // Min ms of speech between volume changes + int16_t activeSpeech; // Milliseconds of active speech + int16_t muteGuardMs; // Counter to prevent mute action + int16_t inQueue; // 10 ms batch indicator + + // Microphone level variables + int32_t micRef; // Remember ref. mic level for virtual mic + uint16_t gainTableIdx; // Current position in virtual gain table + int32_t micGainIdx; // Gain index of mic level to increase slowly + int32_t micVol; // Remember volume between frames + int32_t maxLevel; // Max possible vol level, incl dig gain + int32_t maxAnalog; // Maximum possible analog volume level + int32_t maxInit; // Initial value of "max" + int32_t minLevel; // Minimum possible volume level + int32_t minOutput; // Minimum output volume level + int32_t zeroCtrlMax; // Remember max gain => don't amp low input + int32_t lastInMicLevel; + + int16_t scale; // Scale factor for internal volume levels + // Structs for VAD and digital_agc + AgcVad vadMic; + DigitalAgc digitalAgc; + + int16_t lowLevelSignal; +} LegacyAgc; + +} // namespace webrtc + +#endif // MODULES_AUDIO_PROCESSING_AGC_LEGACY_ANALOG_AGC_H_ |