| 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_REFLECTIONS_NODE_H_ |
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| 18 | #define RESONANCE_AUDIO_GRAPH_REFLECTIONS_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 "ambisonics/foa_rotator.h" |
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| 23 | #include "api/resonance_audio_api.h" |
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| 24 | #include "base/audio_buffer.h" |
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| 25 | #include "base/misc_math.h" |
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| 26 | #include "dsp/reflections_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 accepts a single mono buffer as input and outputs an ambisonically |
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| 33 | // encoded sound field buffer of the mix of all the early room reflections. |
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| 34 | class ReflectionsNode : public ProcessingNode { |
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| 35 | public: |
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| 36 | // Initializes |ReflectionsNode| class. |
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| 37 | // |
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| 38 | // @param system_settings Global system configuration. |
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| 39 | explicit ReflectionsNode(const SystemSettings& system_settings); |
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| 40 | |
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| 41 | // Updates the reflections. Depending on whether to use RT60s for reverb |
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| 42 | // according to the global system settings, the reflections are calculated |
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| 43 | // either by the current room properties or the proxy room properties. |
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| 44 | void Update(); |
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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 | const SystemSettings& system_settings_; |
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| 52 | |
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| 53 | // First-order-ambisonics rotator to be used to rotate the reflections with |
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| 54 | // respect to the listener's orientation. |
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| 55 | FoaRotator foa_rotator_; |
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| 56 | |
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| 57 | // Processes and encodes reflections into an ambisonic buffer. |
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| 58 | ReflectionsProcessor reflections_processor_; |
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| 59 | |
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| 60 | // Most recently updated reflection properties. |
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| 61 | ReflectionProperties reflection_properties_; |
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| 62 | |
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| 63 | // Most recently updated listener position. |
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| 64 | WorldPosition listener_position_; |
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| 65 | |
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| 66 | size_t num_frames_processed_on_empty_input_; |
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| 67 | |
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| 68 | // Ambisonic output buffer. |
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| 69 | AudioBuffer output_buffer_; |
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| 70 | |
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| 71 | // Silence mono buffer to render reflection tails during the absence of input |
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| 72 | // buffers. |
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| 73 | AudioBuffer silence_mono_buffer_; |
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| 74 | }; |
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| 75 | |
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| 76 | } // namespace vraudio |
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| 77 | |
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| 78 | #endif // RESONANCE_AUDIO_GRAPH_REFLECTIONS_NODE_H_ |
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| 79 | |
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