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54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
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/*
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* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_AUDIO_PROCESSING_AEC3_ERL_ESTIMATOR_H_
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#define MODULES_AUDIO_PROCESSING_AEC3_ERL_ESTIMATOR_H_
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#include <stddef.h>
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#include <array>
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#include "api/array_view.h"
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#include "modules/audio_processing/aec3/aec3_common.h"
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#include "rtc_base/constructormagic.h"
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namespace webrtc {
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// Estimates the echo return loss based on the signal spectra.
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class ErlEstimator {
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public:
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explicit ErlEstimator(size_t startup_phase_length_blocks_);
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~ErlEstimator();
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// Resets the ERL estimation.
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void Reset();
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// Updates the ERL estimate.
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void Update(bool converged_filter,
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rtc::ArrayView<const float> render_spectrum,
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rtc::ArrayView<const float> capture_spectrum);
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// Returns the most recent ERL estimate.
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const std::array<float, kFftLengthBy2Plus1>& Erl() const { return erl_; }
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float ErlTimeDomain() const { return erl_time_domain_; }
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private:
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const size_t startup_phase_length_blocks__;
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std::array<float, kFftLengthBy2Plus1> erl_;
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std::array<int, kFftLengthBy2Minus1> hold_counters_;
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float erl_time_domain_;
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int hold_counter_time_domain_;
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size_t blocks_since_reset_ = 0;
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RTC_DISALLOW_COPY_AND_ASSIGN(ErlEstimator);
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AEC3_ERL_ESTIMATOR_H_
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