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/*
Copyright 2018 Google Inc. All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS-IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#ifndef RESONANCE_AUDIO_GRAPH_REVERB_NODE_H_
#define RESONANCE_AUDIO_GRAPH_REVERB_NODE_H_
#include "api/resonance_audio_api.h"
#include "base/audio_buffer.h"
#include "dsp/fft_manager.h"
#include "dsp/reverb_onset_compensator.h"
#include "dsp/spectral_reverb.h"
#include "graph/system_settings.h"
#include "node/processing_node.h"
namespace vraudio {
// Implements a spectral reverb producing a decorrelated stereo output with
// onset compensated by a pair of convolution filters.
class ReverbNode : public ProcessingNode {
public:
// Constructs a |ReverbNode|.
//
// @param system_settings Global system configuration.
// @param fft_manager Pointer to a manager to perform FFT transformations.
ReverbNode(const SystemSettings& system_settings, FftManager* fft_manager);
// Updates the |SpectralReverb| using the current room properties or RT60
// values depending on the system settings.
void Update();
const AudioBuffer *GetOutputBuffer() const;
protected:
// Implements ProcessingNode.
const AudioBuffer* AudioProcess(const NodeInput& input) override;
private:
// Global system configuration.
const SystemSettings& system_settings_;
// Current reverb properties.
ReverbProperties reverb_properties_;
// New reverb properties.
ReverbProperties new_reverb_properties_;
// Per band reverb time update step sizes.
std::vector<float> rt60_band_update_steps_;
// Update step size for the gain parameter.
float gain_update_step_;
// Denotes whether the rt60s are currently being updated.
bool rt60_updating_;
// Denotes whether the gain is currently being updated.
bool gain_updating_;
// Number of buffers to updae rt60s over.
float buffers_to_update_;
// DSP class to perform filtering associated with the reverb.
SpectralReverb spectral_reverb_;
// DSP class to perform spectral reverb onset compensation.
ReverbOnsetCompensator onset_compensator_;
// Number of frames of zeroed out data to be processed by the node to ensure
// the entire tail is rendered after input has ceased.
size_t num_frames_processed_on_empty_input_;
// Longest current reverb time, across all bands, in frames.
size_t reverb_length_frames_;
// Output buffers for mixing spectral reverb and compensator output.
AudioBuffer output_buffer_;
AudioBuffer compensator_output_buffer_;
// Silence mono buffer to render reverb tails during the absence of input
// buffers.
AudioBuffer silence_mono_buffer_;
};
} // namespace vraudio
#endif // RESONANCE_AUDIO_GRAPH_REVERB_NODE_H_
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