1d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org/* 2d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. 3d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org * 4d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org * Use of this source code is governed by a BSD-style license 5d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org * that can be found in the LICENSE file in the root of the source 6d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org * tree. An additional intellectual property rights grant can be found 7d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org * in the file PATENTS. All contributing project authors may 8d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org * be found in the AUTHORS file in the root of the source tree. 9d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org */ 10d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org 119c55f0f957534144d2b8a64154f0a479249b34behenrik.lundin@webrtc.org#include "webrtc/modules/audio_coding/neteq/normal.h" 12d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org 1312dc1a38ca54a000e4fecfbc6d41138b895c9ca5pbos@webrtc.org#include <string.h> // memset, memcpy 1412dc1a38ca54a000e4fecfbc6d41138b895c9ca5pbos@webrtc.org 15d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org#include <algorithm> // min 16d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org 17d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h" 18e04a93bcf5e1b608c798a6a3148224b8035f0119kwiberg@webrtc.org#include "webrtc/modules/audio_coding/codecs/audio_decoder.h" 193c652b67468d182bd36aee4c31557621be50cc92kjellander@webrtc.org#include "webrtc/modules/audio_coding/codecs/cng/webrtc_cng.h" 209c55f0f957534144d2b8a64154f0a479249b34behenrik.lundin@webrtc.org#include "webrtc/modules/audio_coding/neteq/audio_multi_vector.h" 219c55f0f957534144d2b8a64154f0a479249b34behenrik.lundin@webrtc.org#include "webrtc/modules/audio_coding/neteq/background_noise.h" 229c55f0f957534144d2b8a64154f0a479249b34behenrik.lundin@webrtc.org#include "webrtc/modules/audio_coding/neteq/decoder_database.h" 239c55f0f957534144d2b8a64154f0a479249b34behenrik.lundin@webrtc.org#include "webrtc/modules/audio_coding/neteq/expand.h" 24d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org 25d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.orgnamespace webrtc { 26d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org 27d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.orgint Normal::Process(const int16_t* input, 28d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org size_t length, 29d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org Modes last_mode, 30d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org int16_t* external_mute_factor_array, 31fd11bbfb56b42f82e18a744a414325db7a56013fhenrik.lundin@webrtc.org AudioMultiVector* output) { 32d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org if (length == 0) { 33d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Nothing to process. 34d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org output->Clear(); 35362a55e7b0852a7be95f0d627321503258152551turaj@webrtc.org return static_cast<int>(length); 36d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org } 37d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org 38d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org assert(output->Empty()); 39d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Output should be empty at this point. 40ee0fb187a583b0c66b2c9fc8571411dca510ce7bhenrik.lundin@webrtc.org if (length % output->Channels() != 0) { 41ee0fb187a583b0c66b2c9fc8571411dca510ce7bhenrik.lundin@webrtc.org // The length does not match the number of channels. 42ee0fb187a583b0c66b2c9fc8571411dca510ce7bhenrik.lundin@webrtc.org output->Clear(); 43ee0fb187a583b0c66b2c9fc8571411dca510ce7bhenrik.lundin@webrtc.org return 0; 44ee0fb187a583b0c66b2c9fc8571411dca510ce7bhenrik.lundin@webrtc.org } 45d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org output->PushBackInterleaved(input, length); 46d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org int16_t* signal = &(*output)[0][0]; 47d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org 48dce40cf804019a9898b6ab8d8262466b697c56e0Peter Kasting const int fs_mult = fs_hz_ / 8000; 49d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org assert(fs_mult > 0); 50d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // fs_shift = log2(fs_mult), rounded down. 51d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Note that |fs_shift| is not "exact" for 48 kHz. 52d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // TODO(hlundin): Investigate this further. 53dce40cf804019a9898b6ab8d8262466b697c56e0Peter Kasting const int fs_shift = 30 - WebRtcSpl_NormW32(fs_mult); 54d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org 55d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Check if last RecOut call resulted in an Expand. If so, we have to take 56d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // care of some cross-fading and unmuting. 57d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org if (last_mode == kModeExpand) { 58d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Generate interpolation data using Expand. 59d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // First, set Expand parameters to appropriate values. 60d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org expand_->SetParametersForNormalAfterExpand(); 61d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org 62d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Call Expand. 63fd11bbfb56b42f82e18a744a414325db7a56013fhenrik.lundin@webrtc.org AudioMultiVector expanded(output->Channels()); 64d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org expand_->Process(&expanded); 65d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org expand_->Reset(); 66d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org 67d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org for (size_t channel_ix = 0; channel_ix < output->Channels(); ++channel_ix) { 68d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Adjust muting factor (main muting factor times expand muting factor). 69d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org external_mute_factor_array[channel_ix] = static_cast<int16_t>( 70600587d5ac96c270612716ab76d813e0c275f98cbjornv@webrtc.org (external_mute_factor_array[channel_ix] * 71600587d5ac96c270612716ab76d813e0c275f98cbjornv@webrtc.org expand_->MuteFactor(channel_ix)) >> 14); 72d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org 73d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org int16_t* signal = &(*output)[channel_ix][0]; 74d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org size_t length_per_channel = length / output->Channels(); 75d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Find largest absolute value in new data. 76dce40cf804019a9898b6ab8d8262466b697c56e0Peter Kasting int16_t decoded_max = 77dce40cf804019a9898b6ab8d8262466b697c56e0Peter Kasting WebRtcSpl_MaxAbsValueW16(signal, length_per_channel); 78d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Adjust muting factor if needed (to BGN level). 79dce40cf804019a9898b6ab8d8262466b697c56e0Peter Kasting size_t energy_length = 80dce40cf804019a9898b6ab8d8262466b697c56e0Peter Kasting std::min(static_cast<size_t>(fs_mult * 64), length_per_channel); 81d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org int scaling = 6 + fs_shift 82d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org - WebRtcSpl_NormW32(decoded_max * decoded_max); 83d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org scaling = std::max(scaling, 0); // |scaling| should always be >= 0. 84d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org int32_t energy = WebRtcSpl_DotProductWithScale(signal, signal, 85d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org energy_length, scaling); 86f045e4da43e671ae511aa1d9b6ef2968256a745dPeter Kasting int32_t scaled_energy_length = 87f045e4da43e671ae511aa1d9b6ef2968256a745dPeter Kasting static_cast<int32_t>(energy_length >> scaling); 88f045e4da43e671ae511aa1d9b6ef2968256a745dPeter Kasting if (scaled_energy_length > 0) { 89f045e4da43e671ae511aa1d9b6ef2968256a745dPeter Kasting energy = energy / scaled_energy_length; 90ee0fb187a583b0c66b2c9fc8571411dca510ce7bhenrik.lundin@webrtc.org } else { 91ee0fb187a583b0c66b2c9fc8571411dca510ce7bhenrik.lundin@webrtc.org energy = 0; 92ee0fb187a583b0c66b2c9fc8571411dca510ce7bhenrik.lundin@webrtc.org } 93d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org 94d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org int mute_factor; 95d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org if ((energy != 0) && 96d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org (energy > background_noise_.Energy(channel_ix))) { 97d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Normalize new frame energy to 15 bits. 98d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org scaling = WebRtcSpl_NormW32(energy) - 16; 99d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // We want background_noise_.energy() / energy in Q14. 100d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org int32_t bgn_energy = 101d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org background_noise_.Energy(channel_ix) << (scaling+14); 102b7e5054414ff524f9db81dab7917729b8c4c8bcbPeter Kasting int16_t energy_scaled = static_cast<int16_t>(energy << scaling); 103b7e5054414ff524f9db81dab7917729b8c4c8bcbPeter Kasting int32_t ratio = WebRtcSpl_DivW32W16(bgn_energy, energy_scaled); 104b7e5054414ff524f9db81dab7917729b8c4c8bcbPeter Kasting mute_factor = WebRtcSpl_SqrtFloor(ratio << 14); 105d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org } else { 106d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org mute_factor = 16384; // 1.0 in Q14. 107d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org } 108d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org if (mute_factor > external_mute_factor_array[channel_ix]) { 109b7e5054414ff524f9db81dab7917729b8c4c8bcbPeter Kasting external_mute_factor_array[channel_ix] = 110b7e5054414ff524f9db81dab7917729b8c4c8bcbPeter Kasting static_cast<int16_t>(std::min(mute_factor, 16384)); 111d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org } 112d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org 113d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // If muted increase by 0.64 for every 20 ms (NB/WB 0.0040/0.0020 in Q14). 114dce40cf804019a9898b6ab8d8262466b697c56e0Peter Kasting int increment = 64 / fs_mult; 115d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org for (size_t i = 0; i < length_per_channel; i++) { 116d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Scale with mute factor. 117d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org assert(channel_ix < output->Channels()); 118d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org assert(i < output->Size()); 119d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org int32_t scaled_signal = (*output)[channel_ix][i] * 120d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org external_mute_factor_array[channel_ix]; 121d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Shift 14 with proper rounding. 122b7e5054414ff524f9db81dab7917729b8c4c8bcbPeter Kasting (*output)[channel_ix][i] = 123b7e5054414ff524f9db81dab7917729b8c4c8bcbPeter Kasting static_cast<int16_t>((scaled_signal + 8192) >> 14); 124d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Increase mute_factor towards 16384. 125b7e5054414ff524f9db81dab7917729b8c4c8bcbPeter Kasting external_mute_factor_array[channel_ix] = static_cast<int16_t>(std::min( 126b7e5054414ff524f9db81dab7917729b8c4c8bcbPeter Kasting external_mute_factor_array[channel_ix] + increment, 16384)); 127d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org } 128d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org 129d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Interpolate the expanded data into the new vector. 130d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // (NB/WB/SWB32/SWB48 8/16/32/48 samples.) 131d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org assert(fs_shift < 3); // Will always be 0, 1, or, 2. 132d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org increment = 4 >> fs_shift; 133d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org int fraction = increment; 134dce40cf804019a9898b6ab8d8262466b697c56e0Peter Kasting for (size_t i = 0; i < static_cast<size_t>(8 * fs_mult); i++) { 135d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // TODO(hlundin): Add 16 instead of 8 for correct rounding. Keeping 8 136d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // now for legacy bit-exactness. 137d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org assert(channel_ix < output->Channels()); 138d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org assert(i < output->Size()); 139d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org (*output)[channel_ix][i] = 140b7e5054414ff524f9db81dab7917729b8c4c8bcbPeter Kasting static_cast<int16_t>((fraction * (*output)[channel_ix][i] + 141b7e5054414ff524f9db81dab7917729b8c4c8bcbPeter Kasting (32 - fraction) * expanded[channel_ix][i] + 8) >> 5); 142d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org fraction += increment; 143d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org } 144d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org } 145d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org } else if (last_mode == kModeRfc3389Cng) { 146d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org assert(output->Channels() == 1); // Not adapted for multi-channel yet. 147dce40cf804019a9898b6ab8d8262466b697c56e0Peter Kasting static const size_t kCngLength = 32; 148d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org int16_t cng_output[kCngLength]; 149d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Reset mute factor and start up fresh. 150d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org external_mute_factor_array[0] = 16384; 151d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org AudioDecoder* cng_decoder = decoder_database_->GetActiveCngDecoder(); 152d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org 153d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org if (cng_decoder) { 154d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Generate long enough for 32kHz. 1558b2058e73354e7f02cc44bc212fa58a52bb376cbkwiberg@webrtc.org if (WebRtcCng_Generate(cng_decoder->CngDecoderInstance(), cng_output, 1568b2058e73354e7f02cc44bc212fa58a52bb376cbkwiberg@webrtc.org kCngLength, 0) < 0) { 157d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Error returned; set return vector to all zeros. 158d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org memset(cng_output, 0, sizeof(cng_output)); 159d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org } 160d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org } else { 161d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // If no CNG instance is defined, just copy from the decoded data. 162d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // (This will result in interpolating the decoded with itself.) 163d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org memcpy(cng_output, signal, fs_mult * 8 * sizeof(int16_t)); 164d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org } 165d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Interpolate the CNG into the new vector. 166d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // (NB/WB/SWB32/SWB48 8/16/32/48 samples.) 167d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org assert(fs_shift < 3); // Will always be 0, 1, or, 2. 168d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org int16_t increment = 4 >> fs_shift; 169d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org int16_t fraction = increment; 170dce40cf804019a9898b6ab8d8262466b697c56e0Peter Kasting for (size_t i = 0; i < static_cast<size_t>(8 * fs_mult); i++) { 171d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // TODO(hlundin): Add 16 instead of 8 for correct rounding. Keeping 8 now 172d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // for legacy bit-exactness. 173d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org signal[i] = 174d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org (fraction * signal[i] + (32 - fraction) * cng_output[i] + 8) >> 5; 175d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org fraction += increment; 176d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org } 177d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org } else if (external_mute_factor_array[0] < 16384) { 178d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Previous was neither of Expand, FadeToBGN or RFC3389_CNG, but we are 179d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // still ramping up from previous muting. 180d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // If muted increase by 0.64 for every 20 ms (NB/WB 0.0040/0.0020 in Q14). 181dce40cf804019a9898b6ab8d8262466b697c56e0Peter Kasting int increment = 64 / fs_mult; 182d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org size_t length_per_channel = length / output->Channels(); 183d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org for (size_t i = 0; i < length_per_channel; i++) { 184d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org for (size_t channel_ix = 0; channel_ix < output->Channels(); 185d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org ++channel_ix) { 186d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Scale with mute factor. 187d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org assert(channel_ix < output->Channels()); 188d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org assert(i < output->Size()); 189d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org int32_t scaled_signal = (*output)[channel_ix][i] * 190d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org external_mute_factor_array[channel_ix]; 191d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Shift 14 with proper rounding. 192b7e5054414ff524f9db81dab7917729b8c4c8bcbPeter Kasting (*output)[channel_ix][i] = 193b7e5054414ff524f9db81dab7917729b8c4c8bcbPeter Kasting static_cast<int16_t>((scaled_signal + 8192) >> 14); 194d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org // Increase mute_factor towards 16384. 195b7e5054414ff524f9db81dab7917729b8c4c8bcbPeter Kasting external_mute_factor_array[channel_ix] = static_cast<int16_t>(std::min( 196b7e5054414ff524f9db81dab7917729b8c4c8bcbPeter Kasting 16384, external_mute_factor_array[channel_ix] + increment)); 197d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org } 198d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org } 199d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org } 200d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org 201362a55e7b0852a7be95f0d627321503258152551turaj@webrtc.org return static_cast<int>(length); 202d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org} 203d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org 204d94659dc279b86376c1a6470dc326fd342caaa93henrik.lundin@webrtc.org} // namespace webrtc 205