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Diffstat (limited to 'webrtc/modules/audio_processing/agc/legacy/analog_agc.cc')
| -rw-r--r-- | webrtc/modules/audio_processing/agc/legacy/analog_agc.cc | 1238 |
1 files changed, 1238 insertions, 0 deletions
diff --git a/webrtc/modules/audio_processing/agc/legacy/analog_agc.cc b/webrtc/modules/audio_processing/agc/legacy/analog_agc.cc new file mode 100644 index 0000000..b53e3f9 --- /dev/null +++ b/webrtc/modules/audio_processing/agc/legacy/analog_agc.cc @@ -0,0 +1,1238 @@ +/* + * Copyright (c) 2012 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. + */ + +/* + * + * Using a feedback system, determines an appropriate analog volume level + * given an input signal and current volume level. Targets a conservative + * signal level and is intended for use with a digital AGC to apply + * additional gain. + * + */ + +#include "modules/audio_processing/agc/legacy/analog_agc.h" + +#include <stdlib.h> + +#include "rtc_base/checks.h" + +namespace webrtc { + +namespace { + +// Errors +#define AGC_UNSPECIFIED_ERROR 18000 +#define AGC_UNINITIALIZED_ERROR 18002 +#define AGC_NULL_POINTER_ERROR 18003 +#define AGC_BAD_PARAMETER_ERROR 18004 + +/* The slope of in Q13*/ +static const int16_t kSlope1[8] = {21793, 12517, 7189, 4129, + 2372, 1362, 472, 78}; + +/* The offset in Q14 */ +static const int16_t kOffset1[8] = {25395, 23911, 22206, 20737, + 19612, 18805, 17951, 17367}; + +/* The slope of in Q13*/ +static const int16_t kSlope2[8] = {2063, 1731, 1452, 1218, 1021, 857, 597, 337}; + +/* The offset in Q14 */ +static const int16_t kOffset2[8] = {18432, 18379, 18290, 18177, + 18052, 17920, 17670, 17286}; + +static const int16_t kMuteGuardTimeMs = 8000; +static const int16_t kInitCheck = 42; +static const size_t kNumSubframes = 10; + +/* Default settings if config is not used */ +#define AGC_DEFAULT_TARGET_LEVEL 3 +#define AGC_DEFAULT_COMP_GAIN 9 +/* This is the target level for the analog part in ENV scale. To convert to RMS + * scale you + * have to add OFFSET_ENV_TO_RMS. + */ +#define ANALOG_TARGET_LEVEL 11 +#define ANALOG_TARGET_LEVEL_2 5 // ANALOG_TARGET_LEVEL / 2 +/* Offset between RMS scale (analog part) and ENV scale (digital part). This + * value actually + * varies with the FIXED_ANALOG_TARGET_LEVEL, hence we should in the future + * replace it with + * a table. + */ +#define OFFSET_ENV_TO_RMS 9 +/* The reference input level at which the digital part gives an output of + * targetLevelDbfs + * (desired level) if we have no compression gain. This level should be set high + * enough not + * to compress the peaks due to the dynamics. + */ +#define DIGITAL_REF_AT_0_COMP_GAIN 4 +/* Speed of reference level decrease. + */ +#define DIFF_REF_TO_ANALOG 5 + +/* Size of analog gain table */ +#define GAIN_TBL_LEN 32 +/* Matlab code: + * fprintf(1, '\t%i, %i, %i, %i,\n', round(10.^(linspace(0,10,32)/20) * 2^12)); + */ +/* Q12 */ +static const uint16_t kGainTableAnalog[GAIN_TBL_LEN] = { + 4096, 4251, 4412, 4579, 4752, 4932, 5118, 5312, 5513, 5722, 5938, + 6163, 6396, 6638, 6889, 7150, 7420, 7701, 7992, 8295, 8609, 8934, + 9273, 9623, 9987, 10365, 10758, 11165, 11587, 12025, 12480, 12953}; + +/* Gain/Suppression tables for virtual Mic (in Q10) */ +static const uint16_t kGainTableVirtualMic[128] = { + 1052, 1081, 1110, 1141, 1172, 1204, 1237, 1271, 1305, 1341, 1378, + 1416, 1454, 1494, 1535, 1577, 1620, 1664, 1710, 1757, 1805, 1854, + 1905, 1957, 2010, 2065, 2122, 2180, 2239, 2301, 2364, 2428, 2495, + 2563, 2633, 2705, 2779, 2855, 2933, 3013, 3096, 3180, 3267, 3357, + 3449, 3543, 3640, 3739, 3842, 3947, 4055, 4166, 4280, 4397, 4517, + 4640, 4767, 4898, 5032, 5169, 5311, 5456, 5605, 5758, 5916, 6078, + 6244, 6415, 6590, 6770, 6956, 7146, 7341, 7542, 7748, 7960, 8178, + 8402, 8631, 8867, 9110, 9359, 9615, 9878, 10148, 10426, 10711, 11004, + 11305, 11614, 11932, 12258, 12593, 12938, 13292, 13655, 14029, 14412, 14807, + 15212, 15628, 16055, 16494, 16945, 17409, 17885, 18374, 18877, 19393, 19923, + 20468, 21028, 21603, 22194, 22801, 23425, 24065, 24724, 25400, 26095, 26808, + 27541, 28295, 29069, 29864, 30681, 31520, 32382}; +static const uint16_t kSuppressionTableVirtualMic[128] = { + 1024, 1006, 988, 970, 952, 935, 918, 902, 886, 870, 854, 839, 824, 809, 794, + 780, 766, 752, 739, 726, 713, 700, 687, 675, 663, 651, 639, 628, 616, 605, + 594, 584, 573, 563, 553, 543, 533, 524, 514, 505, 496, 487, 478, 470, 461, + 453, 445, 437, 429, 421, 414, 406, 399, 392, 385, 378, 371, 364, 358, 351, + 345, 339, 333, 327, 321, 315, 309, 304, 298, 293, 288, 283, 278, 273, 268, + 263, 258, 254, 249, 244, 240, 236, 232, 227, 223, 219, 215, 211, 208, 204, + 200, 197, 193, 190, 186, 183, 180, 176, 173, 170, 167, 164, 161, 158, 155, + 153, 150, 147, 145, 142, 139, 137, 134, 132, 130, 127, 125, 123, 121, 118, + 116, 114, 112, 110, 108, 106, 104, 102}; + +/* Table for target energy levels. Values in Q(-7) + * Matlab code + * targetLevelTable = fprintf('%d,\t%d,\t%d,\t%d,\n', + * round((32767*10.^(-(0:63)'/20)).^2*16/2^7) */ + +static const int32_t kTargetLevelTable[64] = { + 134209536, 106606424, 84680493, 67264106, 53429779, 42440782, 33711911, + 26778323, 21270778, 16895980, 13420954, 10660642, 8468049, 6726411, + 5342978, 4244078, 3371191, 2677832, 2127078, 1689598, 1342095, + 1066064, 846805, 672641, 534298, 424408, 337119, 267783, + 212708, 168960, 134210, 106606, 84680, 67264, 53430, + 42441, 33712, 26778, 21271, 16896, 13421, 10661, + 8468, 6726, 5343, 4244, 3371, 2678, 2127, + 1690, 1342, 1066, 847, 673, 534, 424, + 337, 268, 213, 169, 134, 107, 85, + 67}; + +} // namespace + +int WebRtcAgc_AddMic(void* state, + int16_t* const* in_mic, + size_t num_bands, + size_t samples) { + int32_t nrg, max_nrg, sample, tmp32; + int32_t* ptr; + uint16_t targetGainIdx, gain; + size_t i; + int16_t n, L, tmp16, tmp_speech[16]; + LegacyAgc* stt; + stt = reinterpret_cast<LegacyAgc*>(state); + + if (stt->fs == 8000) { + L = 8; + if (samples != 80) { + return -1; + } + } else { + L = 16; + if (samples != 160) { + return -1; + } + } + + /* apply slowly varying digital gain */ + if (stt->micVol > stt->maxAnalog) { + /* |maxLevel| is strictly >= |micVol|, so this condition should be + * satisfied here, ensuring there is no divide-by-zero. */ + RTC_DCHECK_GT(stt->maxLevel, stt->maxAnalog); + + /* Q1 */ + tmp16 = (int16_t)(stt->micVol - stt->maxAnalog); + tmp32 = (GAIN_TBL_LEN - 1) * tmp16; + tmp16 = (int16_t)(stt->maxLevel - stt->maxAnalog); + targetGainIdx = tmp32 / tmp16; + RTC_DCHECK_LT(targetGainIdx, GAIN_TBL_LEN); + + /* Increment through the table towards the target gain. + * If micVol drops below maxAnalog, we allow the gain + * to be dropped immediately. */ + if (stt->gainTableIdx < targetGainIdx) { + stt->gainTableIdx++; + } else if (stt->gainTableIdx > targetGainIdx) { + stt->gainTableIdx--; + } + + /* Q12 */ + gain = kGainTableAnalog[stt->gainTableIdx]; + + for (i = 0; i < samples; i++) { + size_t j; + for (j = 0; j < num_bands; ++j) { + sample = (in_mic[j][i] * gain) >> 12; + if (sample > 32767) { + in_mic[j][i] = 32767; + } else if (sample < -32768) { + in_mic[j][i] = -32768; + } else { + in_mic[j][i] = (int16_t)sample; + } + } + } + } else { + stt->gainTableIdx = 0; + } + + /* compute envelope */ + if (stt->inQueue > 0) { + ptr = stt->env[1]; + } else { + ptr = stt->env[0]; + } + + for (i = 0; i < kNumSubframes; i++) { + /* iterate over samples */ + max_nrg = 0; + for (n = 0; n < L; n++) { + nrg = in_mic[0][i * L + n] * in_mic[0][i * L + n]; + if (nrg > max_nrg) { + max_nrg = nrg; + } + } + ptr[i] = max_nrg; + } + + /* compute energy */ + if (stt->inQueue > 0) { + ptr = stt->Rxx16w32_array[1]; + } else { + ptr = stt->Rxx16w32_array[0]; + } + + for (i = 0; i < kNumSubframes / 2; i++) { + if (stt->fs == 16000) { + WebRtcSpl_DownsampleBy2(&in_mic[0][i * 32], 32, tmp_speech, + stt->filterState); + } else { + memcpy(tmp_speech, &in_mic[0][i * 16], 16 * sizeof(int16_t)); + } + /* Compute energy in blocks of 16 samples */ + ptr[i] = WebRtcSpl_DotProductWithScale(tmp_speech, tmp_speech, 16, 4); + } + + /* update queue information */ + if (stt->inQueue == 0) { + stt->inQueue = 1; + } else { + stt->inQueue = 2; + } + + /* call VAD (use low band only) */ + WebRtcAgc_ProcessVad(&stt->vadMic, in_mic[0], samples); + + return 0; +} + +int WebRtcAgc_AddFarend(void* state, const int16_t* in_far, size_t samples) { + LegacyAgc* stt = reinterpret_cast<LegacyAgc*>(state); + + int err = WebRtcAgc_GetAddFarendError(state, samples); + + if (err != 0) + return err; + + return WebRtcAgc_AddFarendToDigital(&stt->digitalAgc, in_far, samples); +} + +int WebRtcAgc_GetAddFarendError(void* state, size_t samples) { + LegacyAgc* stt; + stt = reinterpret_cast<LegacyAgc*>(state); + + if (stt == NULL) + return -1; + + if (stt->fs == 8000) { + if (samples != 80) + return -1; + } else if (stt->fs == 16000 || stt->fs == 32000 || stt->fs == 48000) { + if (samples != 160) + return -1; + } else { + return -1; + } + + return 0; +} + +int WebRtcAgc_VirtualMic(void* agcInst, + int16_t* const* in_near, + size_t num_bands, + size_t samples, + int32_t micLevelIn, + int32_t* micLevelOut) { + int32_t tmpFlt, micLevelTmp, gainIdx; + uint16_t gain; + size_t ii, j; + LegacyAgc* stt; + + uint32_t nrg; + size_t sampleCntr; + uint32_t frameNrg = 0; + uint32_t frameNrgLimit = 5500; + int16_t numZeroCrossing = 0; + const int16_t kZeroCrossingLowLim = 15; + const int16_t kZeroCrossingHighLim = 20; + + stt = reinterpret_cast<LegacyAgc*>(agcInst); + + /* + * Before applying gain decide if this is a low-level signal. + * The idea is that digital AGC will not adapt to low-level + * signals. + */ + if (stt->fs != 8000) { + frameNrgLimit = frameNrgLimit << 1; + } + + frameNrg = (uint32_t)(in_near[0][0] * in_near[0][0]); + for (sampleCntr = 1; sampleCntr < samples; sampleCntr++) { + // increment frame energy if it is less than the limit + // the correct value of the energy is not important + if (frameNrg < frameNrgLimit) { + nrg = (uint32_t)(in_near[0][sampleCntr] * in_near[0][sampleCntr]); + frameNrg += nrg; + } + + // Count the zero crossings + numZeroCrossing += + ((in_near[0][sampleCntr] ^ in_near[0][sampleCntr - 1]) < 0); + } + + if ((frameNrg < 500) || (numZeroCrossing <= 5)) { + stt->lowLevelSignal = 1; + } else if (numZeroCrossing <= kZeroCrossingLowLim) { + stt->lowLevelSignal = 0; + } else if (frameNrg <= frameNrgLimit) { + stt->lowLevelSignal = 1; + } else if (numZeroCrossing >= kZeroCrossingHighLim) { + stt->lowLevelSignal = 1; + } else { + stt->lowLevelSignal = 0; + } + + micLevelTmp = micLevelIn << stt->scale; + /* Set desired level */ + gainIdx = stt->micVol; + if (stt->micVol > stt->maxAnalog) { + gainIdx = stt->maxAnalog; + } + if (micLevelTmp != stt->micRef) { + /* Something has happened with the physical level, restart. */ + stt->micRef = micLevelTmp; + stt->micVol = 127; + *micLevelOut = 127; + stt->micGainIdx = 127; + gainIdx = 127; + } + /* Pre-process the signal to emulate the microphone level. */ + /* Take one step at a time in the gain table. */ + if (gainIdx > 127) { + gain = kGainTableVirtualMic[gainIdx - 128]; + } else { + gain = kSuppressionTableVirtualMic[127 - gainIdx]; + } + for (ii = 0; ii < samples; ii++) { + tmpFlt = (in_near[0][ii] * gain) >> 10; + if (tmpFlt > 32767) { + tmpFlt = 32767; + gainIdx--; + if (gainIdx >= 127) { + gain = kGainTableVirtualMic[gainIdx - 127]; + } else { + gain = kSuppressionTableVirtualMic[127 - gainIdx]; + } + } + if (tmpFlt < -32768) { + tmpFlt = -32768; + gainIdx--; + if (gainIdx >= 127) { + gain = kGainTableVirtualMic[gainIdx - 127]; + } else { + gain = kSuppressionTableVirtualMic[127 - gainIdx]; + } + } + in_near[0][ii] = (int16_t)tmpFlt; + for (j = 1; j < num_bands; ++j) { + tmpFlt = (in_near[j][ii] * gain) >> 10; + if (tmpFlt > 32767) { + tmpFlt = 32767; + } + if (tmpFlt < -32768) { + tmpFlt = -32768; + } + in_near[j][ii] = (int16_t)tmpFlt; + } + } + /* Set the level we (finally) used */ + stt->micGainIdx = gainIdx; + // *micLevelOut = stt->micGainIdx; + *micLevelOut = stt->micGainIdx >> stt->scale; + /* Add to Mic as if it was the output from a true microphone */ + if (WebRtcAgc_AddMic(agcInst, in_near, num_bands, samples) != 0) { + return -1; + } + return 0; +} + +void WebRtcAgc_UpdateAgcThresholds(LegacyAgc* stt) { + int16_t tmp16; + + /* Set analog target level in envelope dBOv scale */ + tmp16 = (DIFF_REF_TO_ANALOG * stt->compressionGaindB) + ANALOG_TARGET_LEVEL_2; + tmp16 = WebRtcSpl_DivW32W16ResW16((int32_t)tmp16, ANALOG_TARGET_LEVEL); + stt->analogTarget = DIGITAL_REF_AT_0_COMP_GAIN + tmp16; + if (stt->analogTarget < DIGITAL_REF_AT_0_COMP_GAIN) { + stt->analogTarget = DIGITAL_REF_AT_0_COMP_GAIN; + } + if (stt->agcMode == kAgcModeFixedDigital) { + /* Adjust for different parameter interpretation in FixedDigital mode */ + stt->analogTarget = stt->compressionGaindB; + } + /* Since the offset between RMS and ENV is not constant, we should make this + * into a + * table, but for now, we'll stick with a constant, tuned for the chosen + * analog + * target level. + */ + stt->targetIdx = ANALOG_TARGET_LEVEL + OFFSET_ENV_TO_RMS; + /* Analog adaptation limits */ + /* analogTargetLevel = round((32767*10^(-targetIdx/20))^2*16/2^7) */ + stt->analogTargetLevel = + kRxxBufferLen * kTargetLevelTable[stt->targetIdx]; /* ex. -20 dBov */ + stt->startUpperLimit = + kRxxBufferLen * kTargetLevelTable[stt->targetIdx - 1]; /* -19 dBov */ + stt->startLowerLimit = + kRxxBufferLen * kTargetLevelTable[stt->targetIdx + 1]; /* -21 dBov */ + stt->upperPrimaryLimit = + kRxxBufferLen * kTargetLevelTable[stt->targetIdx - 2]; /* -18 dBov */ + stt->lowerPrimaryLimit = + kRxxBufferLen * kTargetLevelTable[stt->targetIdx + 2]; /* -22 dBov */ + stt->upperSecondaryLimit = + kRxxBufferLen * kTargetLevelTable[stt->targetIdx - 5]; /* -15 dBov */ + stt->lowerSecondaryLimit = + kRxxBufferLen * kTargetLevelTable[stt->targetIdx + 5]; /* -25 dBov */ + stt->upperLimit = stt->startUpperLimit; + stt->lowerLimit = stt->startLowerLimit; +} + +void WebRtcAgc_SaturationCtrl(LegacyAgc* stt, + uint8_t* saturated, + int32_t* env) { + int16_t i, tmpW16; + + /* Check if the signal is saturated */ + for (i = 0; i < 10; i++) { + tmpW16 = (int16_t)(env[i] >> 20); + if (tmpW16 > 875) { + stt->envSum += tmpW16; + } + } + + if (stt->envSum > 25000) { + *saturated = 1; + stt->envSum = 0; + } + + /* stt->envSum *= 0.99; */ + stt->envSum = (int16_t)((stt->envSum * 32440) >> 15); +} + +void WebRtcAgc_ZeroCtrl(LegacyAgc* stt, int32_t* inMicLevel, int32_t* env) { + int16_t i; + int64_t tmp = 0; + int32_t midVal; + + /* Is the input signal zero? */ + for (i = 0; i < 10; i++) { + tmp += env[i]; + } + + /* Each block is allowed to have a few non-zero + * samples. + */ + if (tmp < 500) { + stt->msZero += 10; + } else { + stt->msZero = 0; + } + + if (stt->muteGuardMs > 0) { + stt->muteGuardMs -= 10; + } + + if (stt->msZero > 500) { + stt->msZero = 0; + + /* Increase microphone level only if it's less than 50% */ + midVal = (stt->maxAnalog + stt->minLevel + 1) / 2; + if (*inMicLevel < midVal) { + /* *inMicLevel *= 1.1; */ + *inMicLevel = (1126 * *inMicLevel) >> 10; + /* Reduces risk of a muted mic repeatedly triggering excessive levels due + * to zero signal detection. */ + *inMicLevel = WEBRTC_SPL_MIN(*inMicLevel, stt->zeroCtrlMax); + stt->micVol = *inMicLevel; + } + + stt->activeSpeech = 0; + stt->Rxx16_LPw32Max = 0; + + /* The AGC has a tendency (due to problems with the VAD parameters), to + * vastly increase the volume after a muting event. This timer prevents + * upwards adaptation for a short period. */ + stt->muteGuardMs = kMuteGuardTimeMs; + } +} + +void WebRtcAgc_SpeakerInactiveCtrl(LegacyAgc* stt) { + /* Check if the near end speaker is inactive. + * If that is the case the VAD threshold is + * increased since the VAD speech model gets + * more sensitive to any sound after a long + * silence. + */ + + int32_t tmp32; + int16_t vadThresh; + + if (stt->vadMic.stdLongTerm < 2500) { + stt->vadThreshold = 1500; + } else { + vadThresh = kNormalVadThreshold; + if (stt->vadMic.stdLongTerm < 4500) { + /* Scale between min and max threshold */ + vadThresh += (4500 - stt->vadMic.stdLongTerm) / 2; + } + + /* stt->vadThreshold = (31 * stt->vadThreshold + vadThresh) / 32; */ + tmp32 = vadThresh + 31 * stt->vadThreshold; + stt->vadThreshold = (int16_t)(tmp32 >> 5); + } +} + +void WebRtcAgc_ExpCurve(int16_t volume, int16_t* index) { + // volume in Q14 + // index in [0-7] + /* 8 different curves */ + if (volume > 5243) { + if (volume > 7864) { + if (volume > 12124) { + *index = 7; + } else { + *index = 6; + } + } else { + if (volume > 6554) { + *index = 5; + } else { + *index = 4; + } + } + } else { + if (volume > 2621) { + if (volume > 3932) { + *index = 3; + } else { + *index = 2; + } + } else { + if (volume > 1311) { + *index = 1; + } else { + *index = 0; + } + } + } +} + +int32_t WebRtcAgc_ProcessAnalog(void* state, + int32_t inMicLevel, + int32_t* outMicLevel, + int16_t vadLogRatio, + int16_t echo, + uint8_t* saturationWarning) { + uint32_t tmpU32; + int32_t Rxx16w32, tmp32; + int32_t inMicLevelTmp, lastMicVol; + int16_t i; + uint8_t saturated = 0; + LegacyAgc* stt; + + stt = reinterpret_cast<LegacyAgc*>(state); + inMicLevelTmp = inMicLevel << stt->scale; + + if (inMicLevelTmp > stt->maxAnalog) { + return -1; + } else if (inMicLevelTmp < stt->minLevel) { + return -1; + } + + if (stt->firstCall == 0) { + int32_t tmpVol; + stt->firstCall = 1; + tmp32 = ((stt->maxLevel - stt->minLevel) * 51) >> 9; + tmpVol = (stt->minLevel + tmp32); + + /* If the mic level is very low at start, increase it! */ + if ((inMicLevelTmp < tmpVol) && (stt->agcMode == kAgcModeAdaptiveAnalog)) { + inMicLevelTmp = tmpVol; + } + stt->micVol = inMicLevelTmp; + } + + /* Set the mic level to the previous output value if there is digital input + * gain */ + if ((inMicLevelTmp == stt->maxAnalog) && (stt->micVol > stt->maxAnalog)) { + inMicLevelTmp = stt->micVol; + } + + /* If the mic level was manually changed to a very low value raise it! */ + if ((inMicLevelTmp != stt->micVol) && (inMicLevelTmp < stt->minOutput)) { + tmp32 = ((stt->maxLevel - stt->minLevel) * 51) >> 9; + inMicLevelTmp = (stt->minLevel + tmp32); + stt->micVol = inMicLevelTmp; + } + + if (inMicLevelTmp != stt->micVol) { + if (inMicLevel == stt->lastInMicLevel) { + // We requested a volume adjustment, but it didn't occur. This is + // probably due to a coarse quantization of the volume slider. + // Restore the requested value to prevent getting stuck. + inMicLevelTmp = stt->micVol; + } else { + // As long as the value changed, update to match. + stt->micVol = inMicLevelTmp; + } + } + + if (inMicLevelTmp > stt->maxLevel) { + // Always allow the user to raise the volume above the maxLevel. + stt->maxLevel = inMicLevelTmp; + } + + // Store last value here, after we've taken care of manual updates etc. + stt->lastInMicLevel = inMicLevel; + lastMicVol = stt->micVol; + + /* Checks if the signal is saturated. Also a check if individual samples + * are larger than 12000 is done. If they are the counter for increasing + * the volume level is set to -100ms + */ + WebRtcAgc_SaturationCtrl(stt, &saturated, stt->env[0]); + + /* The AGC is always allowed to lower the level if the signal is saturated */ + if (saturated == 1) { + /* Lower the recording level + * Rxx160_LP is adjusted down because it is so slow it could + * cause the AGC to make wrong decisions. */ + /* stt->Rxx160_LPw32 *= 0.875; */ + stt->Rxx160_LPw32 = (stt->Rxx160_LPw32 / 8) * 7; + + stt->zeroCtrlMax = stt->micVol; + + /* stt->micVol *= 0.903; */ + tmp32 = inMicLevelTmp - stt->minLevel; + tmpU32 = WEBRTC_SPL_UMUL(29591, (uint32_t)(tmp32)); + stt->micVol = (tmpU32 >> 15) + stt->minLevel; + if (stt->micVol > lastMicVol - 2) { + stt->micVol = lastMicVol - 2; + } + inMicLevelTmp = stt->micVol; + + if (stt->micVol < stt->minOutput) { + *saturationWarning = 1; + } + + /* Reset counter for decrease of volume level to avoid + * decreasing too much. The saturation control can still + * lower the level if needed. */ + stt->msTooHigh = -100; + + /* Enable the control mechanism to ensure that our measure, + * Rxx160_LP, is in the correct range. This must be done since + * the measure is very slow. */ + stt->activeSpeech = 0; + stt->Rxx16_LPw32Max = 0; + + /* Reset to initial values */ + stt->msecSpeechInnerChange = kMsecSpeechInner; + stt->msecSpeechOuterChange = kMsecSpeechOuter; + stt->changeToSlowMode = 0; + + stt->muteGuardMs = 0; + + stt->upperLimit = stt->startUpperLimit; + stt->lowerLimit = stt->startLowerLimit; + } + + /* Check if the input speech is zero. If so the mic volume + * is increased. On some computers the input is zero up as high + * level as 17% */ + WebRtcAgc_ZeroCtrl(stt, &inMicLevelTmp, stt->env[0]); + + /* Check if the near end speaker is inactive. + * If that is the case the VAD threshold is + * increased since the VAD speech model gets + * more sensitive to any sound after a long + * silence. + */ + WebRtcAgc_SpeakerInactiveCtrl(stt); + + for (i = 0; i < 5; i++) { + /* Computed on blocks of 16 samples */ + + Rxx16w32 = stt->Rxx16w32_array[0][i]; + + /* Rxx160w32 in Q(-7) */ + tmp32 = (Rxx16w32 - stt->Rxx16_vectorw32[stt->Rxx16pos]) >> 3; + stt->Rxx160w32 = stt->Rxx160w32 + tmp32; + stt->Rxx16_vectorw32[stt->Rxx16pos] = Rxx16w32; + + /* Circular buffer */ + stt->Rxx16pos++; + if (stt->Rxx16pos == kRxxBufferLen) { + stt->Rxx16pos = 0; + } + + /* Rxx16_LPw32 in Q(-4) */ + tmp32 = (Rxx16w32 - stt->Rxx16_LPw32) >> kAlphaShortTerm; + stt->Rxx16_LPw32 = (stt->Rxx16_LPw32) + tmp32; + + if (vadLogRatio > stt->vadThreshold) { + /* Speech detected! */ + + /* Check if Rxx160_LP is in the correct range. If + * it is too high/low then we set it to the maximum of + * Rxx16_LPw32 during the first 200ms of speech. + */ + if (stt->activeSpeech < 250) { + stt->activeSpeech += 2; + + if (stt->Rxx16_LPw32 > stt->Rxx16_LPw32Max) { + stt->Rxx16_LPw32Max = stt->Rxx16_LPw32; + } + } else if (stt->activeSpeech == 250) { + stt->activeSpeech += 2; + tmp32 = stt->Rxx16_LPw32Max >> 3; + stt->Rxx160_LPw32 = tmp32 * kRxxBufferLen; + } + + tmp32 = (stt->Rxx160w32 - stt->Rxx160_LPw32) >> kAlphaLongTerm; + stt->Rxx160_LPw32 = stt->Rxx160_LPw32 + tmp32; + + if (stt->Rxx160_LPw32 > stt->upperSecondaryLimit) { + stt->msTooHigh += 2; + stt->msTooLow = 0; + stt->changeToSlowMode = 0; + + if (stt->msTooHigh > stt->msecSpeechOuterChange) { + stt->msTooHigh = 0; + + /* Lower the recording level */ + /* Multiply by 0.828125 which corresponds to decreasing ~0.8dB */ + tmp32 = stt->Rxx160_LPw32 >> 6; + stt->Rxx160_LPw32 = tmp32 * 53; + + /* Reduce the max gain to avoid excessive oscillation + * (but never drop below the maximum analog level). + */ + stt->maxLevel = (15 * stt->maxLevel + stt->micVol) / 16; + stt->maxLevel = WEBRTC_SPL_MAX(stt->maxLevel, stt->maxAnalog); + + stt->zeroCtrlMax = stt->micVol; + + /* 0.95 in Q15 */ + tmp32 = inMicLevelTmp - stt->minLevel; + tmpU32 = WEBRTC_SPL_UMUL(31130, (uint32_t)(tmp32)); + stt->micVol = (tmpU32 >> 15) + stt->minLevel; + if (stt->micVol > lastMicVol - 1) { + stt->micVol = lastMicVol - 1; + } + inMicLevelTmp = stt->micVol; + + /* Enable the control mechanism to ensure that our measure, + * Rxx160_LP, is in the correct range. + */ + stt->activeSpeech = 0; + stt->Rxx16_LPw32Max = 0; + } + } else if (stt->Rxx160_LPw32 > stt->upperLimit) { + stt->msTooHigh += 2; + stt->msTooLow = 0; + stt->changeToSlowMode = 0; + + if (stt->msTooHigh > stt->msecSpeechInnerChange) { + /* Lower the recording level */ + stt->msTooHigh = 0; + /* Multiply by 0.828125 which corresponds to decreasing ~0.8dB */ + stt->Rxx160_LPw32 = (stt->Rxx160_LPw32 / 64) * 53; + + /* Reduce the max gain to avoid excessive oscillation + * (but never drop below the maximum analog level). + */ + stt->maxLevel = (15 * stt->maxLevel + stt->micVol) / 16; + stt->maxLevel = WEBRTC_SPL_MAX(stt->maxLevel, stt->maxAnalog); + + stt->zeroCtrlMax = stt->micVol; + + /* 0.965 in Q15 */ + tmp32 = inMicLevelTmp - stt->minLevel; + tmpU32 = + WEBRTC_SPL_UMUL(31621, (uint32_t)(inMicLevelTmp - stt->minLevel)); + stt->micVol = (tmpU32 >> 15) + stt->minLevel; + if (stt->micVol > lastMicVol - 1) { + stt->micVol = lastMicVol - 1; + } + inMicLevelTmp = stt->micVol; + } + } else if (stt->Rxx160_LPw32 < stt->lowerSecondaryLimit) { + stt->msTooHigh = 0; + stt->changeToSlowMode = 0; + stt->msTooLow += 2; + + if (stt->msTooLow > stt->msecSpeechOuterChange) { + /* Raise the recording level */ + int16_t index, weightFIX; + int16_t volNormFIX = 16384; // =1 in Q14. + + stt->msTooLow = 0; + + /* Normalize the volume level */ + tmp32 = (inMicLevelTmp - stt->minLevel) << 14; + if (stt->maxInit != stt->minLevel) { + volNormFIX = tmp32 / (stt->maxInit - stt->minLevel); + } + + /* Find correct curve */ + WebRtcAgc_ExpCurve(volNormFIX, &index); + + /* Compute weighting factor for the volume increase, 32^(-2*X)/2+1.05 + */ + weightFIX = + kOffset1[index] - (int16_t)((kSlope1[index] * volNormFIX) >> 13); + + /* stt->Rxx160_LPw32 *= 1.047 [~0.2 dB]; */ + stt->Rxx160_LPw32 = (stt->Rxx160_LPw32 / 64) * 67; + + tmp32 = inMicLevelTmp - stt->minLevel; + tmpU32 = + ((uint32_t)weightFIX * (uint32_t)(inMicLevelTmp - stt->minLevel)); + stt->micVol = (tmpU32 >> 14) + stt->minLevel; + if (stt->micVol < lastMicVol + 2) { + stt->micVol = lastMicVol + 2; + } + + inMicLevelTmp = stt->micVol; + } + } else if (stt->Rxx160_LPw32 < stt->lowerLimit) { + stt->msTooHigh = 0; + stt->changeToSlowMode = 0; + stt->msTooLow += 2; + + if (stt->msTooLow > stt->msecSpeechInnerChange) { + /* Raise the recording level */ + int16_t index, weightFIX; + int16_t volNormFIX = 16384; // =1 in Q14. + + stt->msTooLow = 0; + + /* Normalize the volume level */ + tmp32 = (inMicLevelTmp - stt->minLevel) << 14; + if (stt->maxInit != stt->minLevel) { + volNormFIX = tmp32 / (stt->maxInit - stt->minLevel); + } + + /* Find correct curve */ + WebRtcAgc_ExpCurve(volNormFIX, &index); + + /* Compute weighting factor for the volume increase, (3.^(-2.*X))/8+1 + */ + weightFIX = + kOffset2[index] - (int16_t)((kSlope2[index] * volNormFIX) >> 13); + + /* stt->Rxx160_LPw32 *= 1.047 [~0.2 dB]; */ + stt->Rxx160_LPw32 = (stt->Rxx160_LPw32 / 64) * 67; + + tmp32 = inMicLevelTmp - stt->minLevel; + tmpU32 = + ((uint32_t)weightFIX * (uint32_t)(inMicLevelTmp - stt->minLevel)); + stt->micVol = (tmpU32 >> 14) + stt->minLevel; + if (stt->micVol < lastMicVol + 1) { + stt->micVol = lastMicVol + 1; + } + + inMicLevelTmp = stt->micVol; + } + } else { + /* The signal is inside the desired range which is: + * lowerLimit < Rxx160_LP/640 < upperLimit + */ + if (stt->changeToSlowMode > 4000) { + stt->msecSpeechInnerChange = 1000; + stt->msecSpeechOuterChange = 500; + stt->upperLimit = stt->upperPrimaryLimit; + stt->lowerLimit = stt->lowerPrimaryLimit; + } else { + stt->changeToSlowMode += 2; // in milliseconds + } + stt->msTooLow = 0; + stt->msTooHigh = 0; + + stt->micVol = inMicLevelTmp; + } + } + } + + /* Ensure gain is not increased in presence of echo or after a mute event + * (but allow the zeroCtrl() increase on the frame of a mute detection). + */ + if (echo == 1 || + (stt->muteGuardMs > 0 && stt->muteGuardMs < kMuteGuardTimeMs)) { + if (stt->micVol > lastMicVol) { + stt->micVol = lastMicVol; + } + } + + /* limit the gain */ + if (stt->micVol > stt->maxLevel) { + stt->micVol = stt->maxLevel; + } else if (stt->micVol < stt->minOutput) { + stt->micVol = stt->minOutput; + } + + *outMicLevel = WEBRTC_SPL_MIN(stt->micVol, stt->maxAnalog) >> stt->scale; + + return 0; +} + +int WebRtcAgc_Analyze(void* agcInst, + const int16_t* const* in_near, + size_t num_bands, + size_t samples, + int32_t inMicLevel, + int32_t* outMicLevel, + int16_t echo, + uint8_t* saturationWarning, + int32_t gains[11]) { + LegacyAgc* stt = reinterpret_cast<LegacyAgc*>(agcInst); + + if (stt == NULL) { + return -1; + } + + if (stt->fs == 8000) { + if (samples != 80) { + return -1; + } + } else if (stt->fs == 16000 || stt->fs == 32000 || stt->fs == 48000) { + if (samples != 160) { + return -1; + } + } else { + return -1; + } + + *saturationWarning = 0; + // TODO(minyue): PUT IN RANGE CHECKING FOR INPUT LEVELS + *outMicLevel = inMicLevel; + + int32_t error = + WebRtcAgc_ComputeDigitalGains(&stt->digitalAgc, in_near, num_bands, + stt->fs, stt->lowLevelSignal, gains); + if (error == -1) { + return -1; + } + + if (stt->agcMode < kAgcModeFixedDigital && + (stt->lowLevelSignal == 0 || stt->agcMode != kAgcModeAdaptiveDigital)) { + if (WebRtcAgc_ProcessAnalog(agcInst, inMicLevel, outMicLevel, + stt->vadMic.logRatio, echo, + saturationWarning) == -1) { + return -1; + } + } + + /* update queue */ + if (stt->inQueue > 1) { + memcpy(stt->env[0], stt->env[1], 10 * sizeof(int32_t)); + memcpy(stt->Rxx16w32_array[0], stt->Rxx16w32_array[1], 5 * sizeof(int32_t)); + } + + if (stt->inQueue > 0) { + stt->inQueue--; + } + + return 0; +} + +int WebRtcAgc_Process(const void* agcInst, + const int32_t gains[11], + const int16_t* const* in_near, + size_t num_bands, + int16_t* const* out) { + const LegacyAgc* stt = (const LegacyAgc*)agcInst; + return WebRtcAgc_ApplyDigitalGains(gains, num_bands, stt->fs, in_near, out); +} + +int WebRtcAgc_set_config(void* agcInst, WebRtcAgcConfig agcConfig) { + LegacyAgc* stt; + stt = reinterpret_cast<LegacyAgc*>(agcInst); + + if (stt == NULL) { + return -1; + } + + if (stt->initFlag != kInitCheck) { + stt->lastError = AGC_UNINITIALIZED_ERROR; + return -1; + } + + if (agcConfig.limiterEnable != kAgcFalse && + agcConfig.limiterEnable != kAgcTrue) { + stt->lastError = AGC_BAD_PARAMETER_ERROR; + return -1; + } + stt->limiterEnable = agcConfig.limiterEnable; + stt->compressionGaindB = agcConfig.compressionGaindB; + if ((agcConfig.targetLevelDbfs < 0) || (agcConfig.targetLevelDbfs > 31)) { + stt->lastError = AGC_BAD_PARAMETER_ERROR; + return -1; + } + stt->targetLevelDbfs = agcConfig.targetLevelDbfs; + + if (stt->agcMode == kAgcModeFixedDigital) { + /* Adjust for different parameter interpretation in FixedDigital mode */ + stt->compressionGaindB += agcConfig.targetLevelDbfs; + } + + /* Update threshold levels for analog adaptation */ + WebRtcAgc_UpdateAgcThresholds(stt); + + /* Recalculate gain table */ + if (WebRtcAgc_CalculateGainTable( + &(stt->digitalAgc.gainTable[0]), stt->compressionGaindB, + stt->targetLevelDbfs, stt->limiterEnable, stt->analogTarget) == -1) { + return -1; + } + /* Store the config in a WebRtcAgcConfig */ + stt->usedConfig.compressionGaindB = agcConfig.compressionGaindB; + stt->usedConfig.limiterEnable = agcConfig.limiterEnable; + stt->usedConfig.targetLevelDbfs = agcConfig.targetLevelDbfs; + + return 0; +} + +int WebRtcAgc_get_config(void* agcInst, WebRtcAgcConfig* config) { + LegacyAgc* stt; + stt = reinterpret_cast<LegacyAgc*>(agcInst); + + if (stt == NULL) { + return -1; + } + + if (config == NULL) { + stt->lastError = AGC_NULL_POINTER_ERROR; + return -1; + } + + if (stt->initFlag != kInitCheck) { + stt->lastError = AGC_UNINITIALIZED_ERROR; + return -1; + } + + config->limiterEnable = stt->usedConfig.limiterEnable; + config->targetLevelDbfs = stt->usedConfig.targetLevelDbfs; + config->compressionGaindB = stt->usedConfig.compressionGaindB; + + return 0; +} + +void* WebRtcAgc_Create() { + LegacyAgc* stt = static_cast<LegacyAgc*>(malloc(sizeof(LegacyAgc))); + + stt->initFlag = 0; + stt->lastError = 0; + + return stt; +} + +void WebRtcAgc_Free(void* state) { + LegacyAgc* stt; + + stt = reinterpret_cast<LegacyAgc*>(state); + free(stt); +} + +/* minLevel - Minimum volume level + * maxLevel - Maximum volume level + */ +int WebRtcAgc_Init(void* agcInst, + int32_t minLevel, + int32_t maxLevel, + int16_t agcMode, + uint32_t fs) { + int32_t max_add, tmp32; + int16_t i; + int tmpNorm; + LegacyAgc* stt; + + /* typecast state pointer */ + stt = reinterpret_cast<LegacyAgc*>(agcInst); + + if (WebRtcAgc_InitDigital(&stt->digitalAgc, agcMode) != 0) { + stt->lastError = AGC_UNINITIALIZED_ERROR; + return -1; + } + + /* Analog AGC variables */ + stt->envSum = 0; + + /* mode = 0 - Only saturation protection + * 1 - Analog Automatic Gain Control [-targetLevelDbfs (default -3 + * dBOv)] + * 2 - Digital Automatic Gain Control [-targetLevelDbfs (default -3 + * dBOv)] + * 3 - Fixed Digital Gain [compressionGaindB (default 8 dB)] + */ + if (agcMode < kAgcModeUnchanged || agcMode > kAgcModeFixedDigital) { + return -1; + } + stt->agcMode = agcMode; + stt->fs = fs; + + /* initialize input VAD */ + WebRtcAgc_InitVad(&stt->vadMic); + + /* If the volume range is smaller than 0-256 then + * the levels are shifted up to Q8-domain */ + tmpNorm = WebRtcSpl_NormU32((uint32_t)maxLevel); + stt->scale = tmpNorm - 23; + if (stt->scale < 0) { + stt->scale = 0; + } + // TODO(bjornv): Investigate if we really need to scale up a small range now + // when we have + // a guard against zero-increments. For now, we do not support scale up (scale + // = 0). + stt->scale = 0; + maxLevel <<= stt->scale; + minLevel <<= stt->scale; + + /* Make minLevel and maxLevel static in AdaptiveDigital */ + if (stt->agcMode == kAgcModeAdaptiveDigital) { + minLevel = 0; + maxLevel = 255; + stt->scale = 0; + } + /* The maximum supplemental volume range is based on a vague idea + * of how much lower the gain will be than the real analog gain. */ + max_add = (maxLevel - minLevel) / 4; + + /* Minimum/maximum volume level that can be set */ + stt->minLevel = minLevel; + stt->maxAnalog = maxLevel; + stt->maxLevel = maxLevel + max_add; + stt->maxInit = stt->maxLevel; + + stt->zeroCtrlMax = stt->maxAnalog; + stt->lastInMicLevel = 0; + + /* Initialize micVol parameter */ + stt->micVol = stt->maxAnalog; + if (stt->agcMode == kAgcModeAdaptiveDigital) { + stt->micVol = 127; /* Mid-point of mic level */ + } + stt->micRef = stt->micVol; + stt->micGainIdx = 127; + + /* Minimum output volume is 4% higher than the available lowest volume level + */ + tmp32 = ((stt->maxLevel - stt->minLevel) * 10) >> 8; + stt->minOutput = (stt->minLevel + tmp32); + + stt->msTooLow = 0; + stt->msTooHigh = 0; + stt->changeToSlowMode = 0; + stt->firstCall = 0; + stt->msZero = 0; + stt->muteGuardMs = 0; + stt->gainTableIdx = 0; + + stt->msecSpeechInnerChange = kMsecSpeechInner; + stt->msecSpeechOuterChange = kMsecSpeechOuter; + + stt->activeSpeech = 0; + stt->Rxx16_LPw32Max = 0; + + stt->vadThreshold = kNormalVadThreshold; + stt->inActive = 0; + + for (i = 0; i < kRxxBufferLen; i++) { + stt->Rxx16_vectorw32[i] = (int32_t)1000; /* -54dBm0 */ + } + stt->Rxx160w32 = 125 * kRxxBufferLen; /* (stt->Rxx16_vectorw32[0]>>3) = 125 */ + + stt->Rxx16pos = 0; + stt->Rxx16_LPw32 = (int32_t)16284; /* Q(-4) */ + + for (i = 0; i < 5; i++) { + stt->Rxx16w32_array[0][i] = 0; + } + for (i = 0; i < 10; i++) { + stt->env[0][i] = 0; + stt->env[1][i] = 0; + } + stt->inQueue = 0; + + WebRtcSpl_MemSetW32(stt->filterState, 0, 8); + + stt->initFlag = kInitCheck; + // Default config settings. + stt->defaultConfig.limiterEnable = kAgcTrue; + stt->defaultConfig.targetLevelDbfs = AGC_DEFAULT_TARGET_LEVEL; + stt->defaultConfig.compressionGaindB = AGC_DEFAULT_COMP_GAIN; + + if (WebRtcAgc_set_config(stt, stt->defaultConfig) == -1) { + stt->lastError = AGC_UNSPECIFIED_ERROR; + return -1; + } + stt->Rxx160_LPw32 = stt->analogTargetLevel; // Initialize rms value + + stt->lowLevelSignal = 0; + + /* Only positive values are allowed that are not too large */ + if ((minLevel >= maxLevel) || (maxLevel & 0xFC000000)) { + return -1; + } else { + return 0; + } +} + +} // namespace webrtc |