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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_SUBTRACTOR_H_
#define MODULES_AUDIO_PROCESSING_AEC3_SUBTRACTOR_H_
#include <array>
#include <algorithm>
#include <vector>
#include "modules/audio_processing/aec3/adaptive_fir_filter.h"
#include "modules/audio_processing/aec3/aec3_common.h"
#include "modules/audio_processing/aec3/aec3_fft.h"
#include "modules/audio_processing/aec3/aec_state.h"
#include "modules/audio_processing/aec3/echo_path_variability.h"
#include "modules/audio_processing/aec3/main_filter_update_gain.h"
#include "modules/audio_processing/aec3/render_buffer.h"
#include "modules/audio_processing/aec3/shadow_filter_update_gain.h"
#include "modules/audio_processing/aec3/subtractor_output.h"
#include "modules/audio_processing/logging/apm_data_dumper.h"
#include "modules/audio_processing/utility/ooura_fft.h"
#include "rtc_base/constructormagic.h"
namespace webrtc {
// Proves linear echo cancellation functionality
class Subtractor {
public:
Subtractor(ApmDataDumper* data_dumper, Aec3Optimization optimization);
~Subtractor();
// Performs the echo subtraction.
void Process(const RenderBuffer& render_buffer,
const rtc::ArrayView<const float> capture,
const RenderSignalAnalyzer& render_signal_analyzer,
const AecState& aec_state,
SubtractorOutput* output);
void HandleEchoPathChange(const EchoPathVariability& echo_path_variability);
// Returns the block-wise frequency response for the main adaptive filter.
const std::vector<std::array<float, kFftLengthBy2Plus1>>&
FilterFrequencyResponse() const {
return main_filter_.FilterFrequencyResponse();
}
// Returns the estimate of the impulse response for the main adaptive filter.
const std::array<float, kAdaptiveFilterTimeDomainLength>&
FilterImpulseResponse() const {
return main_filter_.FilterImpulseResponse();
}
bool ConvergedFilter() const { return converged_filter_; }
private:
const Aec3Fft fft_;
ApmDataDumper* data_dumper_;
const Aec3Optimization optimization_;
AdaptiveFirFilter main_filter_;
AdaptiveFirFilter shadow_filter_;
MainFilterUpdateGain G_main_;
ShadowFilterUpdateGain G_shadow_;
bool converged_filter_ = false;
RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(Subtractor);
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_SUBTRACTOR_H_
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