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/*
* Copyright (c) 2018 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_REVERB_MODEL_H_
#define MODULES_AUDIO_PROCESSING_AEC3_REVERB_MODEL_H_
#include <array>
#include "api/array_view.h"
#include "modules/audio_processing/aec3/aec3_common.h"
namespace webrtc {
// The ReverbModel class describes an exponential reverberant model
// that can be applied over power spectrums.
class ReverbModel {
public:
ReverbModel();
~ReverbModel();
// Resets the state.
void Reset();
// Returns the reverb.
ArrayView<const float, kFftLengthBy2Plus1> reverb() const { return reverb_; }
// The methods UpdateReverbNoFreqShaping and UpdateReverb update the
// estimate of the reverberation contribution to an input/output power
// spectrum. Before applying the exponential reverberant model, the input
// power spectrum is pre-scaled. Use the method UpdateReverb when a different
// scaling should be applied per frequency and UpdateReverb_no_freq_shape if
// the same scaling should be used for all the frequencies.
void UpdateReverbNoFreqShaping(ArrayView<const float> power_spectrum,
float power_spectrum_scaling,
float reverb_decay);
// Update the reverb based on new data.
void UpdateReverb(ArrayView<const float> power_spectrum,
ArrayView<const float> power_spectrum_scaling,
float reverb_decay);
private:
std::array<float, kFftLengthBy2Plus1> reverb_;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_REVERB_MODEL_H_
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