45 lines
1.6 KiB
C++
45 lines
1.6 KiB
C++
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/*
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* Copyright (c) 2018 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/subtractor_output_analyzer.h"
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#include <array>
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#include <numeric>
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namespace webrtc {
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void SubtractorOutputAnalyzer::Update(
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rtc::ArrayView<const float> y,
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const SubtractorOutput& subtractor_output) {
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const auto& e_main = subtractor_output.e_main;
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const auto& e_shadow = subtractor_output.e_shadow;
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const auto sum_of_squares = [](float a, float b) { return a + b * b; };
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const float y2 = std::accumulate(y.begin(), y.end(), 0.f, sum_of_squares);
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const float e2_main =
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std::accumulate(e_main.begin(), e_main.end(), 0.f, sum_of_squares);
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const float e2_shadow =
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std::accumulate(e_shadow.begin(), e_shadow.end(), 0.f, sum_of_squares);
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constexpr float kConvergenceThreshold = 50 * 50 * kBlockSize;
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main_filter_converged_ = e2_main < 0.5f * y2 && y2 > kConvergenceThreshold;
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shadow_filter_converged_ =
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e2_shadow < 0.05 * y2 && y2 > kConvergenceThreshold;
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main_filter_diverged_ = e2_main > 1.5f * y2 && y2 > 30.f * 30.f * kBlockSize;
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}
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void SubtractorOutputAnalyzer::HandleEchoPathChange() {
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shadow_filter_converged_ = false;
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main_filter_converged_ = false;
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main_filter_diverged_ = false;
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}
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} // namespace webrtc
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