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/*
Copyright 2018 Google Inc. All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS-IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#ifndef RESONANCE_AUDIO_NODE_SOURCE_NODE_H_
#define RESONANCE_AUDIO_NODE_SOURCE_NODE_H_
#include <atomic>
#include <memory>
#include "base/audio_buffer.h"
#include "node/publisher_node.h"
namespace vraudio {
// Audio source node that outputs data via the AudioProcess() method.
class SourceNode : public Node, public PublisherNode<const AudioBuffer*> {
public:
typedef PublisherNode<const AudioBuffer*> PublisherNodeType;
SourceNode();
// Node implementation.
void Process() final;
bool CleanUp() final;
// PublisherNode<OutputType> implementation.
std::shared_ptr<Node> GetSharedNodePtr() final;
Node::Output<const AudioBuffer*>* GetOutput() final;
// Marks this node as being out of data and to be removed during the next
// clean-up cycle.
void MarkEndOfStream();
// Disable copy constructor.
SourceNode(const SourceNode& that) = delete;
protected:
// Pure virtual method to implement the audio processing method. This method
// requires to return a single output buffer that can be processed by the node
// subscribers.
//
// @return Returns output data.
virtual const AudioBuffer* AudioProcess() = 0;
private:
// Output stream to write processed data to.
Node::Output<const AudioBuffer*> output_stream_;
// Flag indicating if this source node can be removed.
std::atomic<bool> end_of_stream_;
};
} // namespace vraudio
#endif // RESONANCE_AUDIO_NODE_SOURCE_NODE_H_
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