ambisonic_mixing_encoder_node.h

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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_