Source/WebCore/Modules/webaudio/MediaStreamAudioDestinationNode.h

/*
 * Copyright (C) 2012, 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
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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#pragma once

#if ENABLE(WEB_AUDIO) && ENABLE(MEDIA_STREAM)

#include "AudioBasicInspectorNode.h"
#include "AudioBus.h"
#include "AudioNodeOptions.h"
#include "MediaStream.h"

namespace WebCore {

class BaseAudioContext;
class MediaStreamAudioSource;

class MediaStreamAudioDestinationNode final : public AudioBasicInspectorNode {
    WTF_MAKE_ISO_ALLOCATED(MediaStreamAudioDestinationNode);
public:
    static ExceptionOr<Ref<MediaStreamAudioDestinationNode>> create(BaseAudioContext&, const AudioNodeOptions& = { });

    virtual ~MediaStreamAudioDestinationNode();

    MediaStream& stream() { return m_stream.get(); }

    // AudioNode.
    void process(size_t framesToProcess) final;
    
private:
    explicit MediaStreamAudioDestinationNode(BaseAudioContext&);

    double tailTime() const final { return 0; }
    double latencyTime() const final { return 0; }
    bool requiresTailProcessing() const final { return false; }

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

    Ref<MediaStreamAudioSource> m_source;
    Ref<MediaStream> m_stream;
};

} // namespace WebCore

#endif // ENABLE(WEB_AUDIO) && ENABLE(MEDIA_STREAM)