/*
 * Copyright (C) 2010, Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1.  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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#ifndef AudioBasicProcessorNode_h
#define AudioBasicProcessorNode_h

#include "AudioNode.h"
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/Threading.h>

namespace WebCore {

class AudioBus;
class AudioNodeInput;
class AudioProcessor;
    
// AudioBasicProcessorNode is an AudioNode with one input and one output where the input and output have the same number of channels.
class AudioBasicProcessorNode : public AudioNode {
public:
    AudioBasicProcessorNode(AudioContext*, double sampleRate);

    // AudioNode
    virtual void process(size_t framesToProcess);
    virtual void pullInputs(size_t framesToProcess);
    virtual void reset();
    virtual void initialize();
    virtual void uninitialize();

    // Called in the main thread when the number of channels for the input may have changed.
    virtual void checkNumberOfChannelsForInput(AudioNodeInput*);

    // Returns the number of channels for both the input and the output.
    unsigned numberOfChannels();

protected:
    AudioProcessor* processor() { return m_processor.get(); }
    OwnPtr<AudioProcessor> m_processor;

private:
    // This synchronizes live channel count changes which require an uninitialization / re-initialization.
    mutable Mutex m_processLock;
};

} // namespace WebCore

#endif // AudioBasicProcessorNode_h