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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_
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