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69 lines
2.5 KiB
C
69 lines
2.5 KiB
C
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/*
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* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_AUDIO_PROCESSING_AEC3_REVERB_MODEL_H_
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#define MODULES_AUDIO_PROCESSING_AEC3_REVERB_MODEL_H_
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#include <array>
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#include "api/array_view.h"
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#include "modules/audio_processing/aec3/aec3_common.h"
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namespace webrtc {
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// The ReverbModel class describes an exponential reverberant model
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// that can be applied over power spectrums.
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class ReverbModel {
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public:
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ReverbModel();
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~ReverbModel();
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// Resets the state.
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void Reset();
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// The methods AddReverbNoFreqShaping and AddReverb add the reverberation
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// contribution to an input/output power spectrum
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// Before applying the exponential reverberant model, the input power spectrum
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// is pre-scaled. Use the method AddReverb when a different scaling should be
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// applied per frequency and AddReverb_no_freq_shape if the same scaling
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// should be used for all the frequencies.
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void AddReverbNoFreqShaping(rtc::ArrayView<const float> power_spectrum,
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float power_spectrum_scaling,
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float reverb_decay,
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rtc::ArrayView<float> reverb_power_spectrum);
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void AddReverb(rtc::ArrayView<const float> power_spectrum,
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rtc::ArrayView<const float> freq_response_tail,
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float reverb_decay,
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rtc::ArrayView<float> reverb_power_spectrum);
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// Updates the reverberation contributions without applying any shaping of the
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// spectrum.
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void UpdateReverbContributionsNoFreqShaping(
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rtc::ArrayView<const float> power_spectrum,
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float power_spectrum_scaling,
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float reverb_decay);
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// Returns the current power spectrum reverberation contributions.
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rtc::ArrayView<const float> GetPowerSpectrum() const { return reverb_; }
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private:
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// Updates the reverberation contributions.
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void UpdateReverbContributions(rtc::ArrayView<const float>& power_spectrum,
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rtc::ArrayView<const float>& freq_resp_tail,
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float reverb_decay);
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std::array<float, kFftLengthBy2Plus1> reverb_;
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AEC3_REVERB_MODEL_H_
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