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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_AMBISONIC_MIXING_ENCODER_NODE_H_
#define RESONANCE_AUDIO_GRAPH_AMBISONIC_MIXING_ENCODER_NODE_H_
#include <vector>
#include "ambisonics/ambisonic_lookup_table.h"
#include "base/audio_buffer.h"
#include "base/spherical_angle.h"
#include "dsp/gain_mixer.h"
#include "graph/system_settings.h"
#include "node/processing_node.h"
namespace vraudio {
// Node that accepts single mono sound object buffer as input and encodes it
// into an Ambisonic sound field.
class AmbisonicMixingEncoderNode : public ProcessingNode {
public:
// Initializes AmbisonicMixingEncoderNode class.
//
// @param system_settings Global system configuration.
// @param lookup_table Ambisonic encoding lookup table.
// @param ambisonic_order Order of Ambisonic sources.
AmbisonicMixingEncoderNode(const SystemSettings& system_settings,
const AmbisonicLookupTable& lookup_table,
int ambisonic_order);
// Node implementation.
bool CleanUp() final {
CallCleanUpOnInputNodes();
// Prevent node from being disconnected when all sources are removed.
return false;
}
protected:
// Implements ProcessingNode.
const AudioBuffer* AudioProcess(const NodeInput& input) override;
private:
const SystemSettings& system_settings_;
const AmbisonicLookupTable& lookup_table_;
// Ambisonic order of encoded sources.
const int ambisonic_order_;
// |GainMixer| instance.
GainMixer gain_mixer_;
// Encoding coefficient values to be applied to encode the input.
std::vector<float> coefficients_;
};
} // namespace vraudio
#endif // RESONANCE_AUDIO_GRAPH_AMBISONIC_MIXING_ENCODER_NODE_H_
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