blob: 56e2266e569e7447a1fb0fc2f6279820d997034a [file] [log] [blame]
* 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.
#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 {
// 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_; }
// 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