| 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_AMBISONIC_MIXING_ENCODER_NODE_H_ |
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| 18 | #define RESONANCE_AUDIO_GRAPH_AMBISONIC_MIXING_ENCODER_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/ambisonic_lookup_table.h" |
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| 23 | #include "base/audio_buffer.h" |
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| 24 | #include "base/spherical_angle.h" |
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| 25 | #include "dsp/gain_mixer.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 single mono sound object buffer as input and encodes it |
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| 32 | // into an Ambisonic sound field. |
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| 33 | class AmbisonicMixingEncoderNode : public ProcessingNode { |
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| 34 | public: |
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| 35 | // Initializes AmbisonicMixingEncoderNode class. |
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| 36 | // |
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| 37 | // @param system_settings Global system configuration. |
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| 38 | // @param lookup_table Ambisonic encoding lookup table. |
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| 39 | // @param ambisonic_order Order of Ambisonic sources. |
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| 40 | AmbisonicMixingEncoderNode(const SystemSettings& system_settings, |
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| 41 | const AmbisonicLookupTable& lookup_table, |
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| 42 | int ambisonic_order); |
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| 43 | |
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| 44 | // Node implementation. |
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| 45 | bool CleanUp() final { |
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| 46 | CallCleanUpOnInputNodes(); |
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| 47 | // Prevent node from being disconnected when all sources are removed. |
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| 48 | return false; |
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| 49 | } |
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| 50 | |
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| 51 | protected: |
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| 52 | // Implements ProcessingNode. |
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| 53 | const AudioBuffer* AudioProcess(const NodeInput& input) override; |
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| 54 | |
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| 55 | private: |
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| 56 | const SystemSettings& system_settings_; |
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| 57 | const AmbisonicLookupTable& lookup_table_; |
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| 58 | |
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| 59 | // Ambisonic order of encoded sources. |
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| 60 | const int ambisonic_order_; |
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| 61 | |
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| 62 | // |GainMixer| instance. |
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| 63 | GainMixer gain_mixer_; |
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| 64 | |
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| 65 | // Encoding coefficient values to be applied to encode the input. |
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| 66 | std::vector<float> coefficients_; |
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| 67 | }; |
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| 68 | |
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| 69 | } // namespace vraudio |
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| 70 | |
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| 71 | #endif // RESONANCE_AUDIO_GRAPH_AMBISONIC_MIXING_ENCODER_NODE_H_ |
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| 72 | |
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