| 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_NEAR_FIELD_EFFECT_NODE_H_ |
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| 18 | #define RESONANCE_AUDIO_GRAPH_NEAR_FIELD_EFFECT_NODE_H_ |
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| 19 | |
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| 20 | #include <vector> |
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| 21 | |
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| 22 | #include "base/audio_buffer.h" |
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| 23 | #include "base/constants_and_types.h" |
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| 24 | #include "dsp/gain_processor.h" |
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| 25 | #include "dsp/near_field_processor.h" |
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| 26 | #include "graph/system_settings.h" |
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| 27 | #include "node/processing_node.h" |
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| 28 | |
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| 29 | namespace vraudio { |
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| 30 | |
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| 31 | // Node that accepts a single mono audio buffer as input, applies an appoximate |
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| 32 | // near field effect and outputs a processed stereo audio buffer. The stereo |
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| 33 | // output buffer can then be combined with a binaural output in order to |
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| 34 | // simulate a sound source which is close (<1m) to the listener's head. |
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| 35 | class NearFieldEffectNode : public ProcessingNode { |
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| 36 | public: |
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| 37 | // Constructor. |
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| 38 | // |
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| 39 | // @param source_id Output buffer source id. |
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| 40 | // @param system_settings Global system settings. |
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| 41 | NearFieldEffectNode(SourceId source_id, |
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| 42 | const SystemSettings& system_settings); |
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| 43 | |
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| 44 | protected: |
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| 45 | // Implements ProcessingNode. |
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| 46 | const AudioBuffer* AudioProcess(const NodeInput& input) override; |
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| 47 | |
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| 48 | private: |
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| 49 | // Left and right processors apply both near field gain and panner gains. |
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| 50 | GainProcessor left_panner_; |
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| 51 | GainProcessor right_panner_; |
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| 52 | |
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| 53 | // Left and right gains for near field and panning combined. |
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| 54 | std::vector<float> pan_gains_; |
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| 55 | |
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| 56 | // Near field processor used to apply approximate near field effect to the |
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| 57 | // mono source signal. |
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| 58 | NearFieldProcessor near_field_processor_; |
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| 59 | |
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| 60 | // Used to obtain head rotation. |
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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_NEAR_FIELD_EFFECT_NODE_H_ |
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| 70 | |
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