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c4b7f037b7
The signal used for delay estimation at downsampling factor 8 is bandpass filtered and contains less energy than for other downsampling factors. This CL adjusts the energy threshold used for determining if there is enough farend activity to update the matched filters in the delay estimator. Only downsampling factor 8 is affected. Bug: webrtc:9288,chromium:846615 Change-Id: I6f38f5609a31e7a08e60571ac75ea75c9962e026 Reviewed-on: https://webrtc-review.googlesource.com/80443 Reviewed-by: Per Åhgren <peah@webrtc.org> Commit-Queue: Gustaf Ullberg <gustaf@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23486}
118 lines
4.5 KiB
C++
118 lines
4.5 KiB
C++
/*
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* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "modules/audio_processing/aec3/echo_path_delay_estimator.h"
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#include <algorithm>
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#include <array>
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#include "api/audio/echo_canceller3_config.h"
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#include "modules/audio_processing/aec3/aec3_common.h"
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#include "modules/audio_processing/logging/apm_data_dumper.h"
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#include "rtc_base/checks.h"
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#include "system_wrappers/include/field_trial.h"
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namespace webrtc {
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namespace {
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size_t GetDownSamplingFactor(const EchoCanceller3Config& config) {
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// Do not use down sampling factor 8 if kill switch is triggered.
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return (config.delay.down_sampling_factor == 8 &&
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field_trial::IsEnabled("WebRTC-Aec3DownSamplingFactor8KillSwitch"))
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? 4
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: config.delay.down_sampling_factor;
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}
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} // namespace
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EchoPathDelayEstimator::EchoPathDelayEstimator(
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ApmDataDumper* data_dumper,
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const EchoCanceller3Config& config)
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: data_dumper_(data_dumper),
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down_sampling_factor_(GetDownSamplingFactor(config)),
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sub_block_size_(down_sampling_factor_ != 0
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? kBlockSize / down_sampling_factor_
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: kBlockSize),
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capture_decimator_(down_sampling_factor_),
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matched_filter_(
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data_dumper_,
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DetectOptimization(),
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sub_block_size_,
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kMatchedFilterWindowSizeSubBlocks,
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config.delay.num_filters,
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kMatchedFilterAlignmentShiftSizeSubBlocks,
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GetDownSamplingFactor(config) == 8
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? config.render_levels.poor_excitation_render_limit_ds8
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: config.render_levels.poor_excitation_render_limit),
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matched_filter_lag_aggregator_(data_dumper_,
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matched_filter_.GetMaxFilterLag()) {
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RTC_DCHECK(data_dumper);
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RTC_DCHECK(down_sampling_factor_ > 0);
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}
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EchoPathDelayEstimator::~EchoPathDelayEstimator() = default;
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void EchoPathDelayEstimator::Reset(bool soft_reset) {
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if (!soft_reset) {
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matched_filter_lag_aggregator_.Reset();
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}
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matched_filter_.Reset();
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old_aggregated_lag_ = rtc::nullopt;
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consistent_estimate_counter_ = 0;
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}
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rtc::Optional<DelayEstimate> EchoPathDelayEstimator::EstimateDelay(
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const DownsampledRenderBuffer& render_buffer,
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rtc::ArrayView<const float> capture) {
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RTC_DCHECK_EQ(kBlockSize, capture.size());
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std::array<float, kBlockSize> downsampled_capture_data;
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rtc::ArrayView<float> downsampled_capture(downsampled_capture_data.data(),
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sub_block_size_);
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data_dumper_->DumpWav("aec3_capture_decimator_input", capture.size(),
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capture.data(), 16000, 1);
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capture_decimator_.Decimate(capture, downsampled_capture);
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data_dumper_->DumpWav("aec3_capture_decimator_output",
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downsampled_capture.size(), downsampled_capture.data(),
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16000 / down_sampling_factor_, 1);
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matched_filter_.Update(render_buffer, downsampled_capture);
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rtc::Optional<DelayEstimate> aggregated_matched_filter_lag =
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matched_filter_lag_aggregator_.Aggregate(
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matched_filter_.GetLagEstimates());
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// TODO(peah): Move this logging outside of this class once EchoCanceller3
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// development is done.
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data_dumper_->DumpRaw(
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"aec3_echo_path_delay_estimator_delay",
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aggregated_matched_filter_lag
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? static_cast<int>(aggregated_matched_filter_lag->delay *
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down_sampling_factor_)
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: -1);
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// Return the detected delay in samples as the aggregated matched filter lag
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// compensated by the down sampling factor for the signal being correlated.
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if (aggregated_matched_filter_lag) {
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aggregated_matched_filter_lag->delay *= down_sampling_factor_;
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}
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if (old_aggregated_lag_ && aggregated_matched_filter_lag &&
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old_aggregated_lag_->delay == aggregated_matched_filter_lag->delay) {
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++consistent_estimate_counter_;
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} else {
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consistent_estimate_counter_ = 0;
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}
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old_aggregated_lag_ = aggregated_matched_filter_lag;
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constexpr size_t kNumBlocksPerSecondBy2 = kNumBlocksPerSecond / 2;
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if (consistent_estimate_counter_ > kNumBlocksPerSecondBy2) {
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Reset(true);
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}
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return aggregated_matched_filter_lag;
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}
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} // namespace webrtc
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