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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_FREQUENCY_RESPONSE_H_
#define MODULES_AUDIO_PROCESSING_AEC3_REVERB_FREQUENCY_RESPONSE_H_
#include <array>
#include <optional>
#include <vector>
#include "api/array_view.h"
#include "modules/audio_processing/aec3/aec3_common.h"
namespace webrtc {
// Class for updating the frequency response for the reverb.
class ReverbFrequencyResponse {
public:
explicit ReverbFrequencyResponse(
bool use_conservative_tail_frequency_response);
~ReverbFrequencyResponse();
// Updates the frequency response estimate of the reverb.
void Update(const std::vector<std::array<float, kFftLengthBy2Plus1>>&
frequency_response,
int filter_delay_blocks,
const std::optional<float>& linear_filter_quality,
bool stationary_block);
// Returns the estimated frequency response for the reverb.
ArrayView<const float> FrequencyResponse() const { return tail_response_; }
private:
void Update(const std::vector<std::array<float, kFftLengthBy2Plus1>>&
frequency_response,
int filter_delay_blocks,
float linear_filter_quality);
const bool use_conservative_tail_frequency_response_;
float average_decay_ = 0.f;
std::array<float, kFftLengthBy2Plus1> tail_response_;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_REVERB_FREQUENCY_RESPONSE_H_
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