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/*
* Copyright (c) 2017 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_ERL_ESTIMATOR_H_
#define MODULES_AUDIO_PROCESSING_AEC3_ERL_ESTIMATOR_H_
#include <stddef.h>
#include <array>
#include <vector>
#include "api/array_view.h"
#include "modules/audio_processing/aec3/aec3_common.h"
namespace webrtc {
// Estimates the echo return loss based on the signal spectra.
class ErlEstimator {
public:
explicit ErlEstimator(size_t startup_phase_length_blocks_);
~ErlEstimator();
ErlEstimator(const ErlEstimator&) = delete;
ErlEstimator& operator=(const ErlEstimator&) = delete;
// Resets the ERL estimation.
void Reset();
// Updates the ERL estimate.
void Update(const std::vector<bool>& converged_filters,
rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>>
render_spectra,
rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>>
capture_spectra);
// Returns the most recent ERL estimate.
const std::array<float, kFftLengthBy2Plus1>& Erl() const { return erl_; }
float ErlTimeDomain() const { return erl_time_domain_; }
private:
const size_t startup_phase_length_blocks__;
std::array<float, kFftLengthBy2Plus1> erl_;
std::array<int, kFftLengthBy2Minus1> hold_counters_;
float erl_time_domain_;
int hold_counter_time_domain_;
size_t blocks_since_reset_ = 0;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_ERL_ESTIMATOR_H_
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