62 lines
2.1 KiB
C
62 lines
2.1 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 WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_POWER_ECHO_MODEL_H_
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#define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_POWER_ECHO_MODEL_H_
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#include <array>
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#include "webrtc/base/constructormagic.h"
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#include "webrtc/base/optional.h"
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#include "webrtc/modules/audio_processing/aec3/aec3_common.h"
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#include "webrtc/modules/audio_processing/aec3/aec_state.h"
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#include "webrtc/modules/audio_processing/aec3/echo_path_variability.h"
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#include "webrtc/modules/audio_processing/aec3/fft_buffer.h"
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namespace webrtc {
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// Provides an echo model based on power spectral estimates that estimates the
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// echo spectrum.
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class PowerEchoModel {
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public:
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PowerEchoModel();
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~PowerEchoModel();
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// Ajusts the model according to echo path changes.
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void HandleEchoPathChange(const EchoPathVariability& variability);
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// Updates the echo model and estimates the echo spectrum.
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void EstimateEcho(
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const FftBuffer& render_buffer,
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const std::array<float, kFftLengthBy2Plus1>& capture_spectrum,
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const AecState& aec_state,
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std::array<float, kFftLengthBy2Plus1>* echo_spectrum);
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// Returns the minimum required farend buffer length.
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size_t MinFarendBufferLength() const { return kRenderBufferSize; }
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private:
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// Provides a float value that is coupled with a counter.
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struct CountedFloat {
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CountedFloat() : value(0.f), counter(0) {}
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CountedFloat(float value, int counter) : value(value), counter(counter) {}
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float value;
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int counter;
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};
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const size_t kRenderBufferSize = 100;
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std::array<CountedFloat, kFftLengthBy2Plus1> H2_;
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RTC_DISALLOW_COPY_AND_ASSIGN(PowerEchoModel);
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_POWER_ECHO_MODEL_H_
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