root/Source/modules/webaudio/MediaElementAudioSourceNode.h

INCLUDED FROM

/*
 * Copyright (C) 2011, Google Inc. All rights reserved.
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#ifndef MediaElementAudioSourceNode_h
#define MediaElementAudioSourceNode_h

#if ENABLE(WEB_AUDIO)

#include "platform/audio/AudioSourceProviderClient.h"
#include "platform/audio/MultiChannelResampler.h"
#include "modules/webaudio/AudioSourceNode.h"
#include "wtf/OwnPtr.h"
#include "wtf/PassRefPtr.h"
#include "wtf/ThreadingPrimitives.h"

namespace WebCore {

class AudioContext;
class HTMLMediaElement;

class MediaElementAudioSourceNode FINAL : public AudioSourceNode, public AudioSourceProviderClient {
public:
    static PassRefPtr<MediaElementAudioSourceNode> create(AudioContext*, HTMLMediaElement*);

    virtual ~MediaElementAudioSourceNode();

    HTMLMediaElement* mediaElement() { return m_mediaElement.get(); }

    // AudioNode
    virtual void process(size_t framesToProcess) OVERRIDE;

    // AudioSourceProviderClient
    virtual void setFormat(size_t numberOfChannels, float sampleRate) OVERRIDE;

    void lock();
    void unlock();

private:
    MediaElementAudioSourceNode(AudioContext*, HTMLMediaElement*);

    // As an audio source, we will never propagate silence.
    virtual bool propagatesSilence() const OVERRIDE { return false; }

    RefPtr<HTMLMediaElement> m_mediaElement;
    Mutex m_processLock;

    unsigned m_sourceNumberOfChannels;
    double m_sourceSampleRate;

    OwnPtr<MultiChannelResampler> m_multiChannelResampler;
};

} // namespace WebCore

#endif // ENABLE(WEB_AUDIO)

#endif // MediaElementAudioSourceNode_h