| /* |
| * Copyright (c) 2017 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. |
| */ |
| #include "webrtc/modules/audio_processing/aec3/echo_path_delay_estimator.h" |
| |
| #include <algorithm> |
| #include <array> |
| |
| #include "webrtc/modules/audio_processing/aec3/aec3_common.h" |
| #include "webrtc/modules/audio_processing/include/audio_processing.h" |
| #include "webrtc/modules/audio_processing/logging/apm_data_dumper.h" |
| #include "webrtc/rtc_base/checks.h" |
| |
| namespace webrtc { |
| |
| namespace { |
| |
| constexpr int kDownSamplingFactor = 4; |
| } // namespace |
| |
| EchoPathDelayEstimator::EchoPathDelayEstimator( |
| ApmDataDumper* data_dumper, |
| const AudioProcessing::Config::EchoCanceller3& config) |
| : data_dumper_(data_dumper), |
| matched_filter_(data_dumper_, |
| DetectOptimization(), |
| kMatchedFilterWindowSizeSubBlocks, |
| kNumMatchedFilters, |
| kMatchedFilterAlignmentShiftSizeSubBlocks, |
| config.param.render_levels.poor_excitation_render_limit), |
| matched_filter_lag_aggregator_(data_dumper_, |
| matched_filter_.NumLagEstimates()) { |
| RTC_DCHECK(data_dumper); |
| } |
| |
| EchoPathDelayEstimator::~EchoPathDelayEstimator() = default; |
| |
| void EchoPathDelayEstimator::Reset() { |
| matched_filter_lag_aggregator_.Reset(); |
| matched_filter_.Reset(); |
| } |
| |
| rtc::Optional<size_t> EchoPathDelayEstimator::EstimateDelay( |
| const DownsampledRenderBuffer& render_buffer, |
| rtc::ArrayView<const float> capture) { |
| RTC_DCHECK_EQ(kBlockSize, capture.size()); |
| |
| std::array<float, kSubBlockSize> downsampled_capture; |
| capture_decimator_.Decimate(capture, downsampled_capture); |
| matched_filter_.Update(render_buffer, downsampled_capture); |
| |
| rtc::Optional<size_t> aggregated_matched_filter_lag = |
| matched_filter_lag_aggregator_.Aggregate( |
| matched_filter_.GetLagEstimates()); |
| |
| // TODO(peah): Move this logging outside of this class once EchoCanceller3 |
| // development is done. |
| data_dumper_->DumpRaw("aec3_echo_path_delay_estimator_delay", |
| aggregated_matched_filter_lag |
| ? static_cast<int>(*aggregated_matched_filter_lag * |
| kDownSamplingFactor) |
| : -1); |
| |
| // Return the detected delay in samples as the aggregated matched filter lag |
| // compensated by the down sampling factor for the signal being correlated. |
| return aggregated_matched_filter_lag |
| ? rtc::Optional<size_t>(*aggregated_matched_filter_lag * |
| kDownSamplingFactor) |
| : rtc::Optional<size_t>(); |
| } |
| |
| } // namespace webrtc |