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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_ERLE_ESTIMATOR_H_
#define MODULES_AUDIO_PROCESSING_AEC3_ERLE_ESTIMATOR_H_
#include <array>
#include "api/array_view.h"
#include "modules/audio_processing/aec3/aec3_common.h"
#include "rtc_base/constructormagic.h"
namespace webrtc {
// Estimates the echo return loss enhancement based on the signal spectra.
class ErleEstimator {
public:
ErleEstimator(float min_erle, float max_erle_lf, float max_erle_hf);
~ErleEstimator();
// Updates the ERLE estimate.
void Update(rtc::ArrayView<const float> render_spectrum,
rtc::ArrayView<const float> capture_spectrum,
rtc::ArrayView<const float> subtractor_spectrum);
// Returns the most recent ERLE estimate.
const std::array<float, kFftLengthBy2Plus1>& Erle() const { return erle_; }
float ErleTimeDomain() const { return erle_time_domain_; }
private:
std::array<float, kFftLengthBy2Plus1> erle_;
std::array<int, kFftLengthBy2Minus1> hold_counters_;
float erle_time_domain_;
int hold_counter_time_domain_;
const float min_erle_;
const float max_erle_lf_;
const float max_erle_hf_;
RTC_DISALLOW_COPY_AND_ASSIGN(ErleEstimator);
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_ERLE_ESTIMATOR_H_