| 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_HOA_ROTATOR_NODE_H_ |
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| 18 | #define RESONANCE_AUDIO_GRAPH_HOA_ROTATOR_NODE_H_ |
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| 19 | |
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| 20 | #include <memory> |
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| 21 | |
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| 22 | #include "ambisonics/hoa_rotator.h" |
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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 "graph/system_settings.h" |
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| 26 | #include "node/processing_node.h" |
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| 27 | |
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| 28 | namespace vraudio { |
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| 29 | |
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| 30 | // Node that accepts a single PeriphonicSoundfieldBuffer as input and outputs a |
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| 31 | // rotated PeriphonicSoundfieldBuffer of the corresponding soundfield input |
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| 32 | // using head rotation information from the system settings. |
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| 33 | class HoaRotatorNode : public ProcessingNode { |
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| 34 | public: |
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| 35 | HoaRotatorNode(SourceId source_id, const SystemSettings& system_settings, |
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| 36 | int ambisonic_order); |
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| 37 | |
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| 38 | protected: |
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| 39 | // Implements ProcessingNode. Returns a null pointer if we are in stereo |
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| 40 | // loudspeaker or stereo pan mode. |
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| 41 | const AudioBuffer* AudioProcess(const NodeInput& input) override; |
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| 42 | |
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| 43 | private: |
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| 44 | const SystemSettings& system_settings_; |
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| 45 | |
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| 46 | // Soundfield rotator used to rotate higher order soundfields. |
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| 47 | HoaRotator hoa_rotator_; |
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| 48 | |
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| 49 | // Output buffer. |
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| 50 | AudioBuffer output_buffer_; |
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| 51 | }; |
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| 52 | |
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| 53 | } // namespace vraudio |
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| 54 | |
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| 55 | #endif // RESONANCE_AUDIO_GRAPH_HOA_ROTATOR_NODE_H_ |
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| 56 | |
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