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/*
* Copyright (c) 2019 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_SUBBAND_NEAREND_DETECTOR_H_
#define MODULES_AUDIO_PROCESSING_AEC3_SUBBAND_NEAREND_DETECTOR_H_
#include <vector>
#include "api/array_view.h"
#include "api/audio/echo_canceller3_config.h"
#include "modules/audio_processing/aec3/moving_average.h"
#include "modules/audio_processing/aec3/nearend_detector.h"
namespace webrtc {
// Class for selecting whether the suppressor is in the nearend or echo state.
class SubbandNearendDetector : public NearendDetector {
public:
SubbandNearendDetector(
const EchoCanceller3Config::Suppressor::SubbandNearendDetection& config,
size_t num_capture_channels);
// Returns whether the current state is the nearend state.
bool IsNearendState() const override { return nearend_state_; }
// Updates the state selection based on latest spectral estimates.
void Update(rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>>
nearend_spectrum,
rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>>
residual_echo_spectrum,
rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>>
comfort_noise_spectrum,
bool initial_state) override;
private:
const EchoCanceller3Config::Suppressor::SubbandNearendDetection config_;
const size_t num_capture_channels_;
std::vector<aec3::MovingAverage> nearend_smoothers_;
const float one_over_subband_length1_;
const float one_over_subband_length2_;
bool nearend_state_ = false;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_SUBBAND_NEAREND_DETECTOR_H_
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