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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.
*/
#ifndef MODULES_AUDIO_PROCESSING_AEC3_SUBBAND_ERLE_ESTIMATOR_H_
#define MODULES_AUDIO_PROCESSING_AEC3_SUBBAND_ERLE_ESTIMATOR_H_
#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 {
public:
SubbandErleEstimator(const EchoCanceller3Config& config,
size_t num_capture_channels);
~SubbandErleEstimator();
// Resets the ERLE estimator.
void Reset();
// Updates the ERLE estimate.
void Update(rtc::ArrayView<const float, kFftLengthBy2Plus1> X2,
rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> Y2,
rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> E2,
const std::vector<bool>& converged_filters);
// Returns the ERLE estimate.
rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> Erle(
bool onset_compensated) const {
return onset_compensated && use_onset_detection_ ? erle_onset_compensated_
: erle_;
}
// Returns the ERLE estimate at onsets (only used for testing).
rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> ErleDuringOnsets()
const {
return erle_during_onsets_;
}
void Dump(const std::unique_ptr<ApmDataDumper>& data_dumper) const;
private:
struct AccumulatedSpectra {
explicit AccumulatedSpectra(size_t num_capture_channels)
: Y2(num_capture_channels),
E2(num_capture_channels),
low_render_energy(num_capture_channels),
num_points(num_capture_channels) {}
std::vector<std::array<float, kFftLengthBy2Plus1>> Y2;
std::vector<std::array<float, kFftLengthBy2Plus1>> E2;
std::vector<std::array<bool, kFftLengthBy2Plus1>> low_render_energy;
std::vector<int> num_points;
};
void UpdateAccumulatedSpectra(
rtc::ArrayView<const float, kFftLengthBy2Plus1> X2,
rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> Y2,
rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> E2,
const std::vector<bool>& converged_filters);
void ResetAccumulatedSpectra();
void UpdateBands(const std::vector<bool>& converged_filters);
void DecreaseErlePerBandForLowRenderSignals();
const bool use_onset_detection_;
const float min_erle_;
const std::array<float, kFftLengthBy2Plus1> max_erle_;
const bool use_min_erle_during_onsets_;
AccumulatedSpectra accum_spectra_;
// ERLE without special handling of render onsets.
std::vector<std::array<float, kFftLengthBy2Plus1>> erle_;
// ERLE lowered during render onsets.
std::vector<std::array<float, kFftLengthBy2Plus1>> erle_onset_compensated_;
// Estimation of ERLE during render onsets.
std::vector<std::array<float, kFftLengthBy2Plus1>> erle_during_onsets_;
std::vector<std::array<bool, kFftLengthBy2Plus1>> coming_onset_;
std::vector<std::array<int, kFftLengthBy2Plus1>> hold_counters_;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_SUBBAND_ERLE_ESTIMATOR_H_
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