blob: 3446c5a54e142cf87fcfd0c0a6fab1c9b77dc7eb [file] [log] [blame]
/*
* 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 <array>
#include <numeric>
namespace webrtc {
void SubtractorOutputAnalyzer::Update(
rtc::ArrayView<const float> y,
const SubtractorOutput& subtractor_output) {
const auto& e_main = subtractor_output.e_main;
const auto& e_shadow = subtractor_output.e_shadow;
const auto sum_of_squares = [](float a, float b) { return a + b * b; };
const float y2 = std::accumulate(y.begin(), y.end(), 0.f, sum_of_squares);
const float e2_main =
std::accumulate(e_main.begin(), e_main.end(), 0.f, sum_of_squares);
const float e2_shadow =
std::accumulate(e_shadow.begin(), e_shadow.end(), 0.f, sum_of_squares);
constexpr float kConvergenceThreshold = 50 * 50 * kBlockSize;
main_filter_converged_ = e2_main < 0.5f * y2 && y2 > kConvergenceThreshold;
shadow_filter_converged_ =
e2_shadow < 0.05 * y2 && y2 > kConvergenceThreshold;
main_filter_diverged_ = e2_main > 1.5f * y2 && y2 > 30.f * 30.f * kBlockSize;
}
void SubtractorOutputAnalyzer::HandleEchoPathChange() {
shadow_filter_converged_ = false;
main_filter_converged_ = false;
main_filter_diverged_ = false;
}
} // namespace webrtc