blob: 29718c37836e8a8bd156279371d8272f00c2db34 [file] [log] [blame]
* 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.
#include <stddef.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 based on the signal spectra.
class ErlEstimator {
explicit ErlEstimator(size_t startup_phase_length_blocks_);
// Resets the ERL estimation.
void Reset();
// Updates the ERL estimate.
void Update(bool converged_filter,
rtc::ArrayView<const float> render_spectrum,
rtc::ArrayView<const float> capture_spectrum);
// Returns the most recent ERL estimate.
const std::array<float, kFftLengthBy2Plus1>& Erl() const { return erl_; }
float ErlTimeDomain() const { return erl_time_domain_; }
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