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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_NEAR_FIELD_EFFECT_NODE_H_
#define RESONANCE_AUDIO_GRAPH_NEAR_FIELD_EFFECT_NODE_H_
#include <vector>
#include "base/audio_buffer.h"
#include "base/constants_and_types.h"
#include "dsp/gain_processor.h"
#include "dsp/near_field_processor.h"
#include "graph/system_settings.h"
#include "node/processing_node.h"
namespace vraudio {
// Node that accepts a single mono audio buffer as input, applies an appoximate
// near field effect and outputs a processed stereo audio buffer. The stereo
// output buffer can then be combined with a binaural output in order to
// simulate a sound source which is close (<1m) to the listener's head.
class NearFieldEffectNode : public ProcessingNode {
public:
// Constructor.
//
// @param source_id Output buffer source id.
// @param system_settings Global system settings.
NearFieldEffectNode(SourceId source_id,
const SystemSettings& system_settings);
protected:
// Implements ProcessingNode.
const AudioBuffer* AudioProcess(const NodeInput& input) override;
private:
// Left and right processors apply both near field gain and panner gains.
GainProcessor left_panner_;
GainProcessor right_panner_;
// Left and right gains for near field and panning combined.
std::vector<float> pan_gains_;
// Near field processor used to apply approximate near field effect to the
// mono source signal.
NearFieldProcessor near_field_processor_;
// Used to obtain head rotation.
const SystemSettings& system_settings_;
// Output buffer.
AudioBuffer output_buffer_;
};
} // namespace vraudio
#endif // RESONANCE_AUDIO_GRAPH_NEAR_FIELD_EFFECT_NODE_H_
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