mirror of
https://github.com/danog/libtgvoip.git
synced 2024-12-12 09:09:38 +01:00
69 lines
2.5 KiB
C
69 lines
2.5 KiB
C
|
/*
|
||
|
|
* 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();
|
||
|
|
|
||
|
|
// The methods AddReverbNoFreqShaping and AddReverb add 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 AddReverb when a different scaling should be
|
||
|
|
// applied per frequency and AddReverb_no_freq_shape if the same scaling
|
||
|
|
// should be used for all the frequencies.
|
||
|
|
void AddReverbNoFreqShaping(rtc::ArrayView<const float> power_spectrum,
|
||
|
|
float power_spectrum_scaling,
|
||
|
|
float reverb_decay,
|
||
|
|
rtc::ArrayView<float> reverb_power_spectrum);
|
||
|
|
|
||
|
|
void AddReverb(rtc::ArrayView<const float> power_spectrum,
|
||
|
|
rtc::ArrayView<const float> freq_response_tail,
|
||
|
|
float reverb_decay,
|
||
|
|
rtc::ArrayView<float> reverb_power_spectrum);
|
||
|
|
|
||
|
|
// Updates the reverberation contributions without applying any shaping of the
|
||
|
|
// spectrum.
|
||
|
|
void UpdateReverbContributionsNoFreqShaping(
|
||
|
|
rtc::ArrayView<const float> power_spectrum,
|
||
|
|
float power_spectrum_scaling,
|
||
|
|
float reverb_decay);
|
||
|
|
|
||
|
|
// Returns the current power spectrum reverberation contributions.
|
||
|
|
rtc::ArrayView<const float> GetPowerSpectrum() const { return reverb_; }
|
||
|
|
|
||
|
|
private:
|
||
|
|
// Updates the reverberation contributions.
|
||
|
|
void UpdateReverbContributions(rtc::ArrayView<const float>& power_spectrum,
|
||
|
|
rtc::ArrayView<const float>& freq_resp_tail,
|
||
|
|
float reverb_decay);
|
||
|
|
|
||
|
|
std::array<float, kFftLengthBy2Plus1> reverb_;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace webrtc
|
||
|
|
|
||
|
|
#endif // MODULES_AUDIO_PROCESSING_AEC3_REVERB_MODEL_H_
|