third_party/WebKit/Source/modules/mediastream/MediaStream.h

/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
 * Copyright (C) 2011 Ericsson AB. 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;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef MediaStream_h
#define MediaStream_h

#include "core/dom/ContextLifecycleObserver.h"
#include "core/html/URLRegistry.h"
#include "modules/EventTargetModules.h"
#include "modules/ModulesExport.h"
#include "modules/mediastream/MediaStreamTrack.h"
#include "platform/Timer.h"
#include "platform/mediastream/MediaStreamDescriptor.h"

namespace blink {

class ExceptionState;

class MODULES_EXPORT MediaStream final
    : public RefCountedGarbageCollectedEventTargetWithInlineData<MediaStream>
    , public URLRegistrable
    , public MediaStreamDescriptorClient
    , public ContextLifecycleObserver {
    REFCOUNTED_GARBAGE_COLLECTED_EVENT_TARGET(MediaStream);
    USING_GARBAGE_COLLECTED_MIXIN(MediaStream);
    DEFINE_WRAPPERTYPEINFO();
public:
    static MediaStream* create(ExecutionContext*);
    static MediaStream* create(ExecutionContext*, MediaStream*);
    static MediaStream* create(ExecutionContext*, const MediaStreamTrackVector&);
    static MediaStream* create(ExecutionContext*, MediaStreamDescriptor*);
    ~MediaStream() override;

    String id() const { return m_descriptor->id(); }

    void addTrack(MediaStreamTrack*, ExceptionState&);
    void removeTrack(MediaStreamTrack*, ExceptionState&);
    MediaStreamTrack* getTrackById(String);
    MediaStream* clone(ExecutionContext*);

    MediaStreamTrackVector getAudioTracks() const { return m_audioTracks; }
    MediaStreamTrackVector getVideoTracks() const { return m_videoTracks; }
    MediaStreamTrackVector getTracks();

    bool active() const { return m_descriptor->active(); }

    DEFINE_ATTRIBUTE_EVENT_LISTENER(active);
    DEFINE_ATTRIBUTE_EVENT_LISTENER(inactive);
    DEFINE_ATTRIBUTE_EVENT_LISTENER(ended);
    DEFINE_ATTRIBUTE_EVENT_LISTENER(addtrack);
    DEFINE_ATTRIBUTE_EVENT_LISTENER(removetrack);

    void trackEnded();

    // MediaStreamDescriptorClient
    void streamEnded() override;

    MediaStreamDescriptor* descriptor() const { return m_descriptor; }

    // EventTarget
    const AtomicString& interfaceName() const override;
    ExecutionContext* getExecutionContext() const override;

    // URLRegistrable
    URLRegistry& registry() const override;

    DECLARE_VIRTUAL_TRACE();

private:
    MediaStream(ExecutionContext*, MediaStreamDescriptor*);
    MediaStream(ExecutionContext*, const MediaStreamTrackVector& audioTracks, const MediaStreamTrackVector& videoTracks);

    // ContextLifecycleObserver
    void contextDestroyed() override;

    // MediaStreamDescriptorClient
    void addRemoteTrack(MediaStreamComponent*) override;
    void removeRemoteTrack(MediaStreamComponent*) override;

    bool emptyOrOnlyEndedTracks();

    void scheduleDispatchEvent(Event*);
    void scheduledEventTimerFired(Timer<MediaStream>*);

    bool m_stopped;

    MediaStreamTrackVector m_audioTracks;
    MediaStreamTrackVector m_videoTracks;
    Member<MediaStreamDescriptor> m_descriptor;

    Timer<MediaStream> m_scheduledEventTimer;
    HeapVector<Member<Event>> m_scheduledEvents;
};

typedef HeapVector<Member<MediaStream>> MediaStreamVector;

MediaStream* toMediaStream(MediaStreamDescriptor*);

} // namespace blink

#endif // MediaStream_h