| 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_NODE_SOURCE_NODE_H_ |
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| 18 | #define RESONANCE_AUDIO_NODE_SOURCE_NODE_H_ |
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| 19 | |
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| 20 | #include <atomic> |
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| 21 | #include <memory> |
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| 22 | |
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| 23 | #include "base/audio_buffer.h" |
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| 24 | #include "node/publisher_node.h" |
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| 25 | |
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| 26 | namespace vraudio { |
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| 27 | |
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| 28 | // Audio source node that outputs data via the AudioProcess() method. |
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| 29 | class SourceNode : public Node, public PublisherNode<const AudioBuffer*> { |
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| 30 | public: |
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| 31 | typedef PublisherNode<const AudioBuffer*> PublisherNodeType; |
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| 32 | |
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| 33 | SourceNode(); |
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| 34 | |
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| 35 | // Node implementation. |
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| 36 | void Process() final; |
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| 37 | bool CleanUp() final; |
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| 38 | |
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| 39 | // PublisherNode<OutputType> implementation. |
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| 40 | std::shared_ptr<Node> GetSharedNodePtr() final; |
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| 41 | Node::Output<const AudioBuffer*>* GetOutput() final; |
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| 42 | |
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| 43 | // Marks this node as being out of data and to be removed during the next |
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| 44 | // clean-up cycle. |
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| 45 | void MarkEndOfStream(); |
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| 46 | |
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| 47 | // Disable copy constructor. |
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| 48 | SourceNode(const SourceNode& that) = delete; |
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| 49 | |
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| 50 | protected: |
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| 51 | // Pure virtual method to implement the audio processing method. This method |
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| 52 | // requires to return a single output buffer that can be processed by the node |
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| 53 | // subscribers. |
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| 54 | // |
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| 55 | // @return Returns output data. |
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| 56 | virtual const AudioBuffer* AudioProcess() = 0; |
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| 57 | |
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| 58 | private: |
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| 59 | // Output stream to write processed data to. |
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| 60 | Node::Output<const AudioBuffer*> output_stream_; |
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| 61 | |
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| 62 | // Flag indicating if this source node can be removed. |
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| 63 | std::atomic<bool> end_of_stream_; |
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| 64 | }; |
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| 65 | |
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| 66 | } // namespace vraudio |
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| 67 | |
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| 68 | #endif // RESONANCE_AUDIO_NODE_SOURCE_NODE_H_ |
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| 69 | |
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