| 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_NODE_H_ |
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| 18 | #define RESONANCE_AUDIO_GRAPH_GAIN_NODE_H_ |
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| 19 | |
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| 20 | #include <memory> |
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| 21 | #include <vector> |
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| 22 | |
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| 23 | #include "base/audio_buffer.h" |
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| 24 | #include "base/constants_and_types.h" |
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| 25 | #include "base/source_parameters.h" |
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| 26 | #include "dsp/gain_processor.h" |
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| 27 | #include "graph/system_settings.h" |
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| 28 | #include "node/processing_node.h" |
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| 29 | |
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| 30 | namespace vraudio { |
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| 31 | |
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| 32 | // Node that calculates and applies a gain value to each channel of an input |
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| 33 | // buffer based upon the given |GainCalculator|. |
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| 34 | class GainNode : public ProcessingNode { |
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| 35 | public: |
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| 36 | // Constructs |GainNode| with given gain attenuation method. |
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| 37 | // |
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| 38 | // @param source_id Output buffer source id. |
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| 39 | // @param num_channels Number of channels in the input buffer. |
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| 40 | // @param attenuation_type Gain attenuation type to be used. |
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| 41 | // @param system_settings Global system settings. |
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| 42 | GainNode(SourceId source_id, size_t num_channels, |
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| 43 | const AttenuationType& attenuation_type, |
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| 44 | const SystemSettings& system_settings); |
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| 45 | |
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| 46 | protected: |
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| 47 | // Implements ProcessingNode. |
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| 48 | const AudioBuffer* AudioProcess(const NodeInput& input) override; |
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| 49 | |
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| 50 | private: |
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| 51 | // Number of channels of the audio buffer. |
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| 52 | const size_t num_channels_; |
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| 53 | |
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| 54 | // Gain attenuation type. |
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| 55 | const AttenuationType attenuation_type_; |
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| 56 | |
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| 57 | // Gain processors per each channel. |
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| 58 | std::vector<GainProcessor> gain_processors_; |
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| 59 | |
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| 60 | // Global system settings. |
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| 61 | const SystemSettings& system_settings_; |
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| 62 | |
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| 63 | // Output buffer. |
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| 64 | AudioBuffer output_buffer_; |
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| 65 | }; |
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| 66 | |
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| 67 | } // namespace vraudio |
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| 68 | |
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| 69 | #endif // RESONANCE_AUDIO_GRAPH_GAIN_NODE_H_ |
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| 70 | |
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