gain_mixer_node.h - mozsearch

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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_GAIN_MIXER_NODE_H_

#define RESONANCE_AUDIO_GRAPH_GAIN_MIXER_NODE_H_

#include "base/audio_buffer.h"

#include "base/source_parameters.h"

#include "dsp/gain_mixer.h"

#include "graph/system_settings.h"

#include "node/processing_node.h"

namespace vraudio {

// Node that accepts multiple input buffers, calculates and applies a gain

// value to each buffer based upon the given |AttenuationType| and then mixes

// the results together.

class GainMixerNode : public ProcessingNode {

 public:

  // Constructs |GainMixerNode| with given gain calculation method.

//

  // @param attenuation_type Gain attenuation type to be used.

  // @param system_settings Global system settings.

  // @param num_channels Number of channels.

  GainMixerNode(const AttenuationType& attenuation_type,

                const SystemSettings& system_settings, size_t num_channels);

  // Mute the mixer node by skipping the audio processing and outputting nullptr

  // buffers.

  void SetMute(bool mute_enabled);

  // Node implementation.

  bool CleanUp() final;

 protected:

  // Implements ProcessingNode.

  const AudioBuffer* AudioProcess(const NodeInput& input) override;

 private:

  // Flag indicating the mute status.

  bool mute_enabled_;

  // Gain attenuation type.

  const AttenuationType attenuation_type_;

  // Gain mixer.

  GainMixer gain_mixer_;

  // Global system settings.

  const SystemSettings& system_settings_;

};

}  // namespace vraudio

#endif  // RESONANCE_AUDIO_GRAPH_GAIN_MIXER_NODE_H_