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/*
* Copyright (c) 2018 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 "modules/audio_processing/aec3/subtractor_output_analyzer.h"
#include <algorithm>
#include "modules/audio_processing/aec3/aec3_common.h"
namespace webrtc {
SubtractorOutputAnalyzer::SubtractorOutputAnalyzer(size_t num_capture_channels)
: filters_converged_(num_capture_channels, false) {}
void SubtractorOutputAnalyzer::Update(
ArrayView<const SubtractorOutput> subtractor_output,
bool* any_filter_converged,
bool* any_coarse_filter_converged,
bool* all_filters_diverged) {
RTC_DCHECK(any_filter_converged);
RTC_DCHECK(all_filters_diverged);
RTC_DCHECK_EQ(subtractor_output.size(), filters_converged_.size());
*any_filter_converged = false;
*any_coarse_filter_converged = false;
*all_filters_diverged = true;
for (size_t ch = 0; ch < subtractor_output.size(); ++ch) {
const float y2 = subtractor_output[ch].y2;
const float e2_refined = subtractor_output[ch].e2_refined;
const float e2_coarse = subtractor_output[ch].e2_coarse;
constexpr float kConvergenceThreshold = 50 * 50 * kBlockSize;
constexpr float kConvergenceThresholdLowLevel = 20 * 20 * kBlockSize;
bool refined_filter_converged =
e2_refined < 0.5f * y2 && y2 > kConvergenceThreshold;
bool coarse_filter_converged_strict =
e2_coarse < 0.05f * y2 && y2 > kConvergenceThreshold;
bool coarse_filter_converged_relaxed =
e2_coarse < 0.3f * y2 && y2 > kConvergenceThresholdLowLevel;
float min_e2 = std::min(e2_refined, e2_coarse);
bool filter_diverged = min_e2 > 1.5f * y2 && y2 > 30.f * 30.f * kBlockSize;
filters_converged_[ch] =
refined_filter_converged || coarse_filter_converged_strict;
*any_filter_converged = *any_filter_converged || filters_converged_[ch];
*any_coarse_filter_converged =
*any_coarse_filter_converged || coarse_filter_converged_relaxed;
*all_filters_diverged = *all_filters_diverged && filter_diverged;
}
}
void SubtractorOutputAnalyzer::HandleEchoPathChange() {
std::fill(filters_converged_.begin(), filters_converged_.end(), false);
}
} // namespace webrtc
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