19a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org/* 29a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. 39a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org * 49a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org * Use of this source code is governed by a BSD-style license 59a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org * that can be found in the LICENSE file in the root of the source 69a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org * tree. An additional intellectual property rights grant can be found 79a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org * in the file PATENTS. All contributing project authors may 89a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org * be found in the AUTHORS file in the root of the source tree. 99a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org */ 109a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 11e5abc854f3dc47de16067c2a41476c39b7626722henrik.lundin@webrtc.org#include "webrtc/modules/audio_coding/neteq/merge.h" 129a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 139a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org#include <assert.h> 143f45c2e0ac4cb280f941efa3a3476895795e3dd6pbos@webrtc.org#include <string.h> // memmove, memcpy, memset, size_t 159a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 169a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org#include <algorithm> // min, max 179a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 189a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h" 19e5abc854f3dc47de16067c2a41476c39b7626722henrik.lundin@webrtc.org#include "webrtc/modules/audio_coding/neteq/audio_multi_vector.h" 20e5abc854f3dc47de16067c2a41476c39b7626722henrik.lundin@webrtc.org#include "webrtc/modules/audio_coding/neteq/dsp_helper.h" 21e5abc854f3dc47de16067c2a41476c39b7626722henrik.lundin@webrtc.org#include "webrtc/modules/audio_coding/neteq/expand.h" 22e5abc854f3dc47de16067c2a41476c39b7626722henrik.lundin@webrtc.org#include "webrtc/modules/audio_coding/neteq/sync_buffer.h" 23c1caa69f05663fc729af5a921eb95a73709f7dcdturaj@webrtc.org#include "webrtc/system_wrappers/interface/scoped_ptr.h" 249a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 259a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.orgnamespace webrtc { 269a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 27045e45efeca8776975254550137ec65268aadb54turaj@webrtc.orgint Merge::Process(int16_t* input, size_t input_length, 289a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int16_t* external_mute_factor_array, 290e9c399746f45ceaf46f12b11ba93c09cca0c2bbhenrik.lundin@webrtc.org AudioMultiVector* output) { 309a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // TODO(hlundin): Change to an enumerator and skip assert. 319a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org assert(fs_hz_ == 8000 || fs_hz_ == 16000 || fs_hz_ == 32000 || 329a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org fs_hz_ == 48000); 339a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org assert(fs_hz_ <= kMaxSampleRate); // Should not be possible. 349a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 359a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int old_length; 369a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int expand_period; 379a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Get expansion data to overlap and mix with. 389a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int expanded_length = GetExpandedSignal(&old_length, &expand_period); 399a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 409a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Transfer input signal to an AudioMultiVector. 410e9c399746f45ceaf46f12b11ba93c09cca0c2bbhenrik.lundin@webrtc.org AudioMultiVector input_vector(num_channels_); 429a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org input_vector.PushBackInterleaved(input, input_length); 439a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org size_t input_length_per_channel = input_vector.Size(); 449a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org assert(input_length_per_channel == input_length / num_channels_); 459a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 469a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int16_t best_correlation_index = 0; 479a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org size_t output_length = 0; 489a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 499a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org for (size_t channel = 0; channel < num_channels_; ++channel) { 509a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int16_t* input_channel = &input_vector[channel][0]; 519a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int16_t* expanded_channel = &expanded_[channel][0]; 529a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int16_t expanded_max, input_max; 53045e45efeca8776975254550137ec65268aadb54turaj@webrtc.org int16_t new_mute_factor = SignalScaling( 54045e45efeca8776975254550137ec65268aadb54turaj@webrtc.org input_channel, static_cast<int>(input_length_per_channel), 55045e45efeca8776975254550137ec65268aadb54turaj@webrtc.org expanded_channel, &expanded_max, &input_max); 569a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 579a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Adjust muting factor (product of "main" muting factor and expand muting 589a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // factor). 599a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int16_t* external_mute_factor = &external_mute_factor_array[channel]; 609a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org *external_mute_factor = 619a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org (*external_mute_factor * expand_->MuteFactor(channel)) >> 14; 629a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 639a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Update |external_mute_factor| if it is lower than |new_mute_factor|. 649a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org if (new_mute_factor > *external_mute_factor) { 659a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org *external_mute_factor = std::min(new_mute_factor, 669a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org static_cast<int16_t>(16384)); 679a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } 689a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 699a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org if (channel == 0) { 709a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Downsample, correlate, and find strongest correlation period for the 719a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // master (i.e., first) channel only. 729a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Downsample to 4kHz sample rate. 73045e45efeca8776975254550137ec65268aadb54turaj@webrtc.org Downsample(input_channel, static_cast<int>(input_length_per_channel), 74045e45efeca8776975254550137ec65268aadb54turaj@webrtc.org expanded_channel, expanded_length); 759a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 769a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Calculate the lag of the strongest correlation period. 77045e45efeca8776975254550137ec65268aadb54turaj@webrtc.org best_correlation_index = CorrelateAndPeakSearch( 78045e45efeca8776975254550137ec65268aadb54turaj@webrtc.org expanded_max, input_max, old_length, 79045e45efeca8776975254550137ec65268aadb54turaj@webrtc.org static_cast<int>(input_length_per_channel), expand_period); 809a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } 819a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 829a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org static const int kTempDataSize = 3600; 839a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int16_t temp_data[kTempDataSize]; // TODO(hlundin) Remove this. 849a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int16_t* decoded_output = temp_data + best_correlation_index; 859a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 869a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Mute the new decoded data if needed (and unmute it linearly). 879a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // This is the overlapping part of expanded_signal. 889a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int interpolation_length = std::min( 899a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org kMaxCorrelationLength * fs_mult_, 909a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org expanded_length - best_correlation_index); 919a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org interpolation_length = std::min(interpolation_length, 929a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org static_cast<int>(input_length_per_channel)); 939a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org if (*external_mute_factor < 16384) { 949a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Set a suitable muting slope (Q20). 0.004 for NB, 0.002 for WB, 959a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // and so on. 969a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int increment = 4194 / fs_mult_; 979a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org *external_mute_factor = DspHelper::RampSignal(input_channel, 989a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org interpolation_length, 999a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org *external_mute_factor, 1009a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org increment); 1019a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org DspHelper::UnmuteSignal(&input_channel[interpolation_length], 1029a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org input_length_per_channel - interpolation_length, 1039a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org external_mute_factor, increment, 1049a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org &decoded_output[interpolation_length]); 1059a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } else { 1069a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // No muting needed. 1079a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org memmove( 1089a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org &decoded_output[interpolation_length], 1099a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org &input_channel[interpolation_length], 1109a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org sizeof(int16_t) * (input_length_per_channel - interpolation_length)); 1119a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } 1129a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 1139a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Do overlap and mix linearly. 1149a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int increment = 16384 / (interpolation_length + 1); // In Q14. 1159a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int16_t mute_factor = 16384 - increment; 1169a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org memmove(temp_data, expanded_channel, 1179a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org sizeof(int16_t) * best_correlation_index); 1189a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org DspHelper::CrossFade(&expanded_channel[best_correlation_index], 1199a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org input_channel, interpolation_length, 1209a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org &mute_factor, increment, decoded_output); 1219a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 1229a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org output_length = best_correlation_index + input_length_per_channel; 1239a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org if (channel == 0) { 1249a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org assert(output->Empty()); // Output should be empty at this point. 1259a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org output->AssertSize(output_length); 1269a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } else { 1279a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org assert(output->Size() == output_length); 1289a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } 1299a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org memcpy(&(*output)[channel][0], temp_data, 1309a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org sizeof(temp_data[0]) * output_length); 1319a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } 1329a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 1339a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Copy back the first part of the data to |sync_buffer_| and remove it from 1349a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // |output|. 1359a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org sync_buffer_->ReplaceAtIndex(*output, old_length, sync_buffer_->next_index()); 1369a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org output->PopFront(old_length); 1379a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 1389a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Return new added length. |old_length| samples were borrowed from 1399a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // |sync_buffer_|. 140045e45efeca8776975254550137ec65268aadb54turaj@webrtc.org return static_cast<int>(output_length) - old_length; 1419a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org} 1429a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 1439a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.orgint Merge::GetExpandedSignal(int* old_length, int* expand_period) { 1449a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Check how much data that is left since earlier. 145045e45efeca8776975254550137ec65268aadb54turaj@webrtc.org *old_length = static_cast<int>(sync_buffer_->FutureLength()); 1469a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Should never be less than overlap_length. 1479a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org assert(*old_length >= static_cast<int>(expand_->overlap_length())); 1489a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Generate data to merge the overlap with using expand. 1499a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org expand_->SetParametersForMergeAfterExpand(); 1509a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 1519a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org if (*old_length >= 210 * kMaxSampleRate / 8000) { 1529a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // TODO(hlundin): Write test case for this. 1539a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // The number of samples available in the sync buffer is more than what fits 1549a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // in expanded_signal. Keep the first 210 * kMaxSampleRate / 8000 samples, 1559a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // but shift them towards the end of the buffer. This is ok, since all of 1569a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // the buffer will be expand data anyway, so as long as the beginning is 1579a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // left untouched, we're fine. 1589a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int16_t length_diff = *old_length - 210 * kMaxSampleRate / 8000; 1599a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org sync_buffer_->InsertZerosAtIndex(length_diff, sync_buffer_->next_index()); 1609a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org *old_length = 210 * kMaxSampleRate / 8000; 1619a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // This is the truncated length. 1629a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } 1639a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // This assert should always be true thanks to the if statement above. 1649a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org assert(210 * kMaxSampleRate / 8000 - *old_length >= 0); 1659a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 1660e9c399746f45ceaf46f12b11ba93c09cca0c2bbhenrik.lundin@webrtc.org AudioMultiVector expanded_temp(num_channels_); 1679a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org expand_->Process(&expanded_temp); 168045e45efeca8776975254550137ec65268aadb54turaj@webrtc.org *expand_period = static_cast<int>(expanded_temp.Size()); // Samples per 169045e45efeca8776975254550137ec65268aadb54turaj@webrtc.org // channel. 1709a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 1719a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org expanded_.Clear(); 1729a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Copy what is left since earlier into the expanded vector. 1739a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org expanded_.PushBackFromIndex(*sync_buffer_, sync_buffer_->next_index()); 1749a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org assert(expanded_.Size() == static_cast<size_t>(*old_length)); 1759a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org assert(expanded_temp.Size() > 0); 1769a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Do "ugly" copy and paste from the expanded in order to generate more data 1779a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // to correlate (but not interpolate) with. 1789a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org const int required_length = (120 + 80 + 2) * fs_mult_; 1799a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org if (expanded_.Size() < static_cast<size_t>(required_length)) { 1809a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org while (expanded_.Size() < static_cast<size_t>(required_length)) { 1819a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Append one more pitch period each time. 1829a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org expanded_.PushBack(expanded_temp); 1839a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } 1849a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Trim the length to exactly |required_length|. 1859a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org expanded_.PopBack(expanded_.Size() - required_length); 1869a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } 1879a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org assert(expanded_.Size() >= static_cast<size_t>(required_length)); 1889a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org return required_length; 1899a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org} 1909a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 1919a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.orgint16_t Merge::SignalScaling(const int16_t* input, int input_length, 1929a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org const int16_t* expanded_signal, 1939a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int16_t* expanded_max, int16_t* input_max) const { 1949a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Adjust muting factor if new vector is more or less of the BGN energy. 1959a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org const int mod_input_length = std::min(64 * fs_mult_, input_length); 1969a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org *expanded_max = WebRtcSpl_MaxAbsValueW16(expanded_signal, mod_input_length); 1979a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org *input_max = WebRtcSpl_MaxAbsValueW16(input, mod_input_length); 1989a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 1999a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Calculate energy of expanded signal. 2009a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // |log_fs_mult| is log2(fs_mult_), but is not exact for 48000 Hz. 2019a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int log_fs_mult = 30 - WebRtcSpl_NormW32(fs_mult_); 2029a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int expanded_shift = 6 + log_fs_mult 2039a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org - WebRtcSpl_NormW32(*expanded_max * *expanded_max); 2049a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org expanded_shift = std::max(expanded_shift, 0); 2059a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int32_t energy_expanded = WebRtcSpl_DotProductWithScale(expanded_signal, 2069a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org expanded_signal, 2079a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org mod_input_length, 2089a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org expanded_shift); 2099a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 2109a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Calculate energy of input signal. 2119a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int input_shift = 6 + log_fs_mult - 2129a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org WebRtcSpl_NormW32(*input_max * *input_max); 2139a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org input_shift = std::max(input_shift, 0); 2149a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int32_t energy_input = WebRtcSpl_DotProductWithScale(input, input, 2159a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org mod_input_length, 2169a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org input_shift); 2179a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 2189a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Align to the same Q-domain. 2199a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org if (input_shift > expanded_shift) { 2209a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org energy_expanded = energy_expanded >> (input_shift - expanded_shift); 2219a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } else { 2229a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org energy_input = energy_input >> (expanded_shift - input_shift); 2239a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } 2249a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 2259a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Calculate muting factor to use for new frame. 2269a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int16_t mute_factor; 2279a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org if (energy_input > energy_expanded) { 2289a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Normalize |energy_input| to 14 bits. 2299a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int16_t temp_shift = WebRtcSpl_NormW32(energy_input) - 17; 2309a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org energy_input = WEBRTC_SPL_SHIFT_W32(energy_input, temp_shift); 2319a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Put |energy_expanded| in a domain 14 higher, so that 2329a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // energy_expanded / energy_input is in Q14. 2339a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org energy_expanded = WEBRTC_SPL_SHIFT_W32(energy_expanded, temp_shift + 14); 2349a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Calculate sqrt(energy_expanded / energy_input) in Q14. 2359a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org mute_factor = WebRtcSpl_SqrtFloor((energy_expanded / energy_input) << 14); 2369a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } else { 2379a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Set to 1 (in Q14) when |expanded| has higher energy than |input|. 2389a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org mute_factor = 16384; 2399a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } 2409a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 2419a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org return mute_factor; 2429a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org} 2439a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 2449a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org// TODO(hlundin): There are some parameter values in this method that seem 2459a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org// strange. Compare with Expand::Correlation. 2469a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.orgvoid Merge::Downsample(const int16_t* input, int input_length, 2479a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org const int16_t* expanded_signal, int expanded_length) { 2489a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org const int16_t* filter_coefficients; 2499a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int num_coefficients; 2509a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int decimation_factor = fs_hz_ / 4000; 2519a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org static const int kCompensateDelay = 0; 25256bf2cdd198ef6bf1ccfc8fe3090066367046de5henrik.lundin@webrtc.org int length_limit = fs_hz_ / 100; // 10 ms in samples. 2539a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org if (fs_hz_ == 8000) { 2549a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org filter_coefficients = DspHelper::kDownsample8kHzTbl; 2559a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org num_coefficients = 3; 2569a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } else if (fs_hz_ == 16000) { 2579a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org filter_coefficients = DspHelper::kDownsample16kHzTbl; 2589a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org num_coefficients = 5; 2599a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } else if (fs_hz_ == 32000) { 2609a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org filter_coefficients = DspHelper::kDownsample32kHzTbl; 2619a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org num_coefficients = 7; 2629a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } else { // fs_hz_ == 48000 2639a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org filter_coefficients = DspHelper::kDownsample48kHzTbl; 2649a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org num_coefficients = 7; 2659a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } 2669a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int signal_offset = num_coefficients - 1; 2679a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org WebRtcSpl_DownsampleFast(&expanded_signal[signal_offset], 2689a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org expanded_length - signal_offset, 2699a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org expanded_downsampled_, kExpandDownsampLength, 2709a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org filter_coefficients, num_coefficients, 2719a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org decimation_factor, kCompensateDelay); 2729a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org if (input_length <= length_limit) { 2739a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Not quite long enough, so we have to cheat a bit. 2749a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int16_t temp_len = input_length - signal_offset; 2759a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // TODO(hlundin): Should |downsamp_temp_len| be corrected for round-off 2769a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // errors? I.e., (temp_len + decimation_factor - 1) / decimation_factor? 2779a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int16_t downsamp_temp_len = temp_len / decimation_factor; 2789a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org WebRtcSpl_DownsampleFast(&input[signal_offset], temp_len, 2799a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org input_downsampled_, downsamp_temp_len, 2809a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org filter_coefficients, num_coefficients, 2819a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org decimation_factor, kCompensateDelay); 2829a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org memset(&input_downsampled_[downsamp_temp_len], 0, 2839a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org sizeof(int16_t) * (kInputDownsampLength - downsamp_temp_len)); 2849a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } else { 2859a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org WebRtcSpl_DownsampleFast(&input[signal_offset], 2869a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org input_length - signal_offset, input_downsampled_, 2879a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org kInputDownsampLength, filter_coefficients, 2889a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org num_coefficients, decimation_factor, 2899a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org kCompensateDelay); 2909a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } 2919a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org} 2929a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 2939a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.orgint16_t Merge::CorrelateAndPeakSearch(int16_t expanded_max, int16_t input_max, 2949a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int start_position, int input_length, 2959a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int expand_period) const { 2969a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Calculate correlation without any normalization. 2979a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org const int max_corr_length = kMaxCorrelationLength; 2989a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int stop_position_downsamp = std::min( 2999a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org max_corr_length, expand_->max_lag() / (fs_mult_ * 2) + 1); 3009a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int16_t correlation_shift = 0; 3019a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org if (expanded_max * input_max > 26843546) { 3029a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org correlation_shift = 3; 3039a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } 3049a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 3059a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int32_t correlation[kMaxCorrelationLength]; 3069a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org WebRtcSpl_CrossCorrelation(correlation, input_downsampled_, 3079a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org expanded_downsampled_, kInputDownsampLength, 3089a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org stop_position_downsamp, correlation_shift, 1); 3099a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 3109a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Normalize correlation to 14 bits and copy to a 16-bit array. 311c1caa69f05663fc729af5a921eb95a73709f7dcdturaj@webrtc.org const int pad_length = static_cast<int>(expand_->overlap_length() - 1); 312c1caa69f05663fc729af5a921eb95a73709f7dcdturaj@webrtc.org const int correlation_buffer_size = 2 * pad_length + kMaxCorrelationLength; 313c1caa69f05663fc729af5a921eb95a73709f7dcdturaj@webrtc.org scoped_ptr<int16_t[]> correlation16(new int16_t[correlation_buffer_size]); 314c1caa69f05663fc729af5a921eb95a73709f7dcdturaj@webrtc.org memset(correlation16.get(), 0, correlation_buffer_size * sizeof(int16_t)); 315c1caa69f05663fc729af5a921eb95a73709f7dcdturaj@webrtc.org int16_t* correlation_ptr = &correlation16[pad_length]; 3169a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int32_t max_correlation = WebRtcSpl_MaxAbsValueW32(correlation, 3179a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org stop_position_downsamp); 3189a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int16_t norm_shift = std::max(0, 17 - WebRtcSpl_NormW32(max_correlation)); 3199a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org WebRtcSpl_VectorBitShiftW32ToW16(correlation_ptr, stop_position_downsamp, 3209a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org correlation, norm_shift); 3219a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 3229a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Calculate allowed starting point for peak finding. 3239a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // The peak location bestIndex must fulfill two criteria: 3249a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // (1) w16_bestIndex + input_length < 3259a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // timestamps_per_call_ + expand_->overlap_length(); 3269a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // (2) w16_bestIndex + input_length < start_position. 327045e45efeca8776975254550137ec65268aadb54turaj@webrtc.org int start_index = timestamps_per_call_ + 328045e45efeca8776975254550137ec65268aadb54turaj@webrtc.org static_cast<int>(expand_->overlap_length()); 3299a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org start_index = std::max(start_position, start_index); 3309a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org start_index = std::max(start_index - input_length, 0); 3319a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Downscale starting index to 4kHz domain. (fs_mult_ * 2 = fs_hz_ / 4000.) 3329a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int start_index_downsamp = start_index / (fs_mult_ * 2); 3339a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 3349a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Calculate a modified |stop_position_downsamp| to account for the increased 3359a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // start index |start_index_downsamp| and the effective array length. 336045e45efeca8776975254550137ec65268aadb54turaj@webrtc.org int modified_stop_pos = 3379a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org std::min(stop_position_downsamp, 338c1caa69f05663fc729af5a921eb95a73709f7dcdturaj@webrtc.org kMaxCorrelationLength + pad_length - start_index_downsamp); 3399a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int best_correlation_index; 3409a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org int16_t best_correlation; 3419a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org static const int kNumCorrelationCandidates = 1; 3429a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org DspHelper::PeakDetection(&correlation_ptr[start_index_downsamp], 3439a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org modified_stop_pos, kNumCorrelationCandidates, 3449a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org fs_mult_, &best_correlation_index, 3459a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org &best_correlation); 3469a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Compensate for modified start index. 3479a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org best_correlation_index += start_index; 3489a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 3499a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // Ensure that underrun does not occur for 10ms case => we have to get at 3509a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // least 10ms + overlap . (This should never happen thanks to the above 3519a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org // modification of peak-finding starting point.) 3529a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org while ((best_correlation_index + input_length) < 3539a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org static_cast<int>(timestamps_per_call_ + expand_->overlap_length()) || 3549a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org best_correlation_index + input_length < start_position) { 3559a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org assert(false); // Should never happen. 3569a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org best_correlation_index += expand_period; // Jump one lag ahead. 3579a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org } 3589a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org return best_correlation_index; 3599a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org} 3609a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org 361c1caa69f05663fc729af5a921eb95a73709f7dcdturaj@webrtc.orgint Merge::RequiredFutureSamples() { 362c1caa69f05663fc729af5a921eb95a73709f7dcdturaj@webrtc.org return static_cast<int>(fs_hz_ / 100 * num_channels_); // 10 ms. 363c1caa69f05663fc729af5a921eb95a73709f7dcdturaj@webrtc.org} 364c1caa69f05663fc729af5a921eb95a73709f7dcdturaj@webrtc.org 365c1caa69f05663fc729af5a921eb95a73709f7dcdturaj@webrtc.org 3669a400812ca0006d12e538d465ab6728a8ecd07aahenrik.lundin@webrtc.org} // namespace webrtc 367