blob: 903c6295df1d4c7bd76f298cd1181728e563984a [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 <stddef.h>
#include <array>
#include <memory>
#include <vector>
#include "api/array_view.h"
#include "api/audio/echo_canceller3_config.h"
#include "modules/audio_processing/aec3/aec3_common.h"
#include "modules/audio_processing/logging/apm_data_dumper.h"
namespace webrtc {
// Estimates the echo return loss enhancement for each frequency subband.
class SubbandErleEstimator {
explicit SubbandErleEstimator(const EchoCanceller3Config& config);
// Resets the ERLE estimator.
void Reset();
// Updates the ERLE estimate.
void Update(rtc::ArrayView<const float> X2,
rtc::ArrayView<const float> Y2,
rtc::ArrayView<const float> E2,
bool converged_filter,
bool onset_detection);
// Returns the ERLE estimate.
const std::array<float, kFftLengthBy2Plus1>& Erle() const { return erle_; }
// Returns the ERLE estimate at onsets.
rtc::ArrayView<const float> ErleOnsets() const { return erle_onsets_; }
void Dump(const std::unique_ptr<ApmDataDumper>& data_dumper) const;
struct AccumulatedSpectra {
std::array<float, kFftLengthBy2Plus1> Y2_;
std::array<float, kFftLengthBy2Plus1> E2_;
std::array<bool, kFftLengthBy2Plus1> low_render_energy_;
std::array<int, kFftLengthBy2Plus1> num_points_;
void UpdateAccumulatedSpectra(rtc::ArrayView<const float> X2,
rtc::ArrayView<const float> Y2,
rtc::ArrayView<const float> E2);
void ResetAccumulatedSpectra();
void UpdateBands(bool onset_detection);
void DecreaseErlePerBandForLowRenderSignals();
const float min_erle_;
const std::array<float, kFftLengthBy2Plus1> max_erle_;
const bool use_min_erle_during_onsets_;
AccumulatedSpectra accum_spectra_;
std::array<float, kFftLengthBy2Plus1> erle_;
std::array<float, kFftLengthBy2Plus1> erle_onsets_;
std::array<bool, kFftLengthBy2Plus1> coming_onset_;
std::array<int, kFftLengthBy2Plus1> hold_counters_;
} // namespace webrtc