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 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 */

#ifndef MediaSourceBase_h
#define MediaSourceBase_h

#include "core/dom/ActiveDOMObject.h"
#include "core/events/EventTarget.h"
#include "core/html/HTMLMediaSource.h"
#include "core/html/URLRegistry.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/RefCounted.h"
#include "wtf/Vector.h"

namespace blink {
class WebMediaSource;
class WebSourceBuffer;
}

namespace WebCore {

class ExceptionState;
class GenericEventQueue;

class MediaSourceBase : public RefCounted<MediaSourceBase>, public HTMLMediaSource, public ActiveDOMObject, public EventTargetWithInlineData {
    REFCOUNTED_EVENT_TARGET(MediaSourceBase);
public:
    static const AtomicString& openKeyword();
    static const AtomicString& closedKeyword();
    static const AtomicString& endedKeyword();

    virtual ~MediaSourceBase();

    void addedToRegistry();
    void removedFromRegistry();
    void openIfInEndedState();
    bool isOpen() const;

    // HTMLMediaSource
    virtual bool attachToElement(HTMLMediaElement*) OVERRIDE;
    virtual void setWebMediaSourceAndOpen(PassOwnPtr<blink::WebMediaSource>) OVERRIDE;
    virtual void close() OVERRIDE;
    virtual bool isClosed() const OVERRIDE;
    virtual double duration() const OVERRIDE;
    virtual PassRefPtr<TimeRanges> buffered() const OVERRIDE;
    virtual void refHTMLMediaSource() OVERRIDE { ref(); }
    virtual void derefHTMLMediaSource() OVERRIDE { deref(); }

    void setDuration(double, ExceptionState&);
    const AtomicString& readyState() const { return m_readyState; }
    void setReadyState(const AtomicString&);
    void endOfStream(const AtomicString& error, ExceptionState&);


    // ActiveDOMObject interface
    virtual bool hasPendingActivity() const OVERRIDE;
    virtual void stop() OVERRIDE;

    // EventTarget interface
    virtual ExecutionContext* executionContext() const OVERRIDE;

    // URLRegistrable interface
    virtual URLRegistry& registry() const OVERRIDE;

protected:
    explicit MediaSourceBase(ExecutionContext*);

    virtual void onReadyStateChange(const AtomicString& oldState, const AtomicString& newState) = 0;
    virtual Vector<RefPtr<TimeRanges> > activeRanges() const = 0;

    PassOwnPtr<blink::WebSourceBuffer> createWebSourceBuffer(const String& type, const Vector<String>& codecs, ExceptionState&);
    void scheduleEvent(const AtomicString& eventName);
    GenericEventQueue* asyncEventQueue() const { return m_asyncEventQueue.get(); }

private:
    OwnPtr<blink::WebMediaSource> m_webMediaSource;
    AtomicString m_readyState;
    OwnPtr<GenericEventQueue> m_asyncEventQueue;
    HTMLMediaElement* m_attachedElement;
};

}

#endif