| 1 | /* |
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| 2 | Copyright 2018 Google Inc. All Rights Reserved. |
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| 3 | |
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| 4 | Licensed under the Apache License, Version 2.0 (the "License"); |
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| 5 | you may not use this file except in compliance with the License. |
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| 6 | You may obtain a copy of the License at |
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| 7 | |
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| 8 | http://www.apache.org/licenses/LICENSE-2.0 |
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| 9 | |
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| 10 | Unless required by applicable law or agreed to in writing, software |
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| 11 | distributed under the License is distributed on an "AS-IS" BASIS, |
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| 12 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 13 | See the License for the specific language governing permissions and |
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| 14 | limitations under the License. |
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| 15 | */ |
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| 16 | |
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| 17 | #ifndef RESONANCE_AUDIO_GRAPH_GAIN_MIXER_NODE_H_ |
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| 18 | #define RESONANCE_AUDIO_GRAPH_GAIN_MIXER_NODE_H_ |
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| 19 | |
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| 20 | #include "base/audio_buffer.h" |
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| 21 | #include "base/source_parameters.h" |
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| 22 | #include "dsp/gain_mixer.h" |
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| 23 | #include "graph/system_settings.h" |
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| 24 | #include "node/processing_node.h" |
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| 25 | |
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| 26 | namespace vraudio { |
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| 27 | |
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| 28 | // Node that accepts multiple input buffers, calculates and applies a gain |
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| 29 | // value to each buffer based upon the given |AttenuationType| and then mixes |
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| 30 | // the results together. |
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| 31 | class GainMixerNode : public ProcessingNode { |
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| 32 | public: |
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| 33 | // Constructs |GainMixerNode| with given gain calculation method. |
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| 34 | // |
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| 35 | // @param attenuation_type Gain attenuation type to be used. |
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| 36 | // @param system_settings Global system settings. |
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| 37 | // @param num_channels Number of channels. |
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| 38 | GainMixerNode(const AttenuationType& attenuation_type, |
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| 39 | const SystemSettings& system_settings, size_t num_channels); |
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| 40 | |
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| 41 | // Mute the mixer node by skipping the audio processing and outputting nullptr |
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| 42 | // buffers. |
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| 43 | void SetMute(bool mute_enabled); |
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| 44 | |
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| 45 | // Node implementation. |
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| 46 | bool CleanUp() final; |
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| 47 | |
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| 48 | protected: |
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| 49 | // Implements ProcessingNode. |
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| 50 | const AudioBuffer* AudioProcess(const NodeInput& input) override; |
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| 51 | |
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| 52 | private: |
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| 53 | // Flag indicating the mute status. |
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| 54 | bool mute_enabled_; |
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| 55 | |
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| 56 | // Gain attenuation type. |
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| 57 | const AttenuationType attenuation_type_; |
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| 58 | |
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| 59 | // Gain mixer. |
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| 60 | GainMixer gain_mixer_; |
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| 61 | |
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| 62 | // Global system settings. |
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| 63 | const SystemSettings& system_settings_; |
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| 64 | }; |
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| 65 | |
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| 66 | } // namespace vraudio |
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| 67 | |
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| 68 | #endif // RESONANCE_AUDIO_GRAPH_GAIN_MIXER_NODE_H_ |
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| 69 | |
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