root/Source/modules/mediastream/MediaStreamTrack.cpp

DEFINITIONS

1. create
2. m_component
3. kind
4. id
5. label
6. enabled
7. setEnabled
8. readyState
9. getSources
10. stopTrack
11. clone
12. ended
13. sourceChangedState
14. propagateTrackEnded
15. component
16. stop
17. createWebAudioSource
18. addObserver
19. removeObserver
20. interfaceName
21. executionContext

/*
 * 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.
 */

#include "config.h"
#include "modules/mediastream/MediaStreamTrack.h"

#include "bindings/v8/ExceptionMessages.h"
#include "core/dom/ExceptionCode.h"
#include "core/dom/ExecutionContext.h"
#include "core/events/Event.h"
#include "modules/mediastream/MediaStreamTrackSourcesCallback.h"
#include "modules/mediastream/MediaStreamTrackSourcesRequestImpl.h"
#include "platform/mediastream/MediaStreamCenter.h"
#include "platform/mediastream/MediaStreamComponent.h"
#include "public/platform/WebSourceInfo.h"

namespace WebCore {

PassRefPtr<MediaStreamTrack> MediaStreamTrack::create(ExecutionContext* context, MediaStreamComponent* component)
{
    RefPtr<MediaStreamTrack> track = adoptRef(new MediaStreamTrack(context, component));
    track->suspendIfNeeded();
    return track.release();
}

MediaStreamTrack::MediaStreamTrack(ExecutionContext* context, MediaStreamComponent* component)
    : ActiveDOMObject(context)
    , m_readyState(MediaStreamSource::ReadyStateLive)
    , m_isIteratingObservers(false)
    , m_stopped(false)
    , m_component(component)
{
    ScriptWrappable::init(this);
    m_component->source()->addObserver(this);
}

MediaStreamTrack::~MediaStreamTrack()
{
    m_component->source()->removeObserver(this);
}

String MediaStreamTrack::kind() const
{
    DEFINE_STATIC_LOCAL(String, audioKind, ("audio"));
    DEFINE_STATIC_LOCAL(String, videoKind, ("video"));

    switch (m_component->source()->type()) {
    case MediaStreamSource::TypeAudio:
        return audioKind;
    case MediaStreamSource::TypeVideo:
        return videoKind;
    }

    ASSERT_NOT_REACHED();
    return audioKind;
}

String MediaStreamTrack::id() const
{
    return m_component->id();
}

String MediaStreamTrack::label() const
{
    return m_component->source()->name();
}

bool MediaStreamTrack::enabled() const
{
    return m_component->enabled();
}

void MediaStreamTrack::setEnabled(bool enabled)
{
    if (enabled == m_component->enabled())
        return;

    m_component->setEnabled(enabled);

    if (!ended())
        MediaStreamCenter::instance().didSetMediaStreamTrackEnabled(m_component.get());
}

String MediaStreamTrack::readyState() const
{
    if (ended())
        return "ended";

    switch (m_readyState) {
    case MediaStreamSource::ReadyStateLive:
        return "live";
    case MediaStreamSource::ReadyStateMuted:
        return "muted";
    case MediaStreamSource::ReadyStateEnded:
        return "ended";
    }

    ASSERT_NOT_REACHED();
    return String();
}

void MediaStreamTrack::getSources(ExecutionContext* context, PassOwnPtr<MediaStreamTrackSourcesCallback> callback, ExceptionState& exceptionState)
{
    RefPtr<MediaStreamTrackSourcesRequest> request = MediaStreamTrackSourcesRequestImpl::create(context->securityOrigin()->toString(), callback);
    if (!MediaStreamCenter::instance().getMediaStreamTrackSources(request.release()))
        exceptionState.throwDOMException(NotSupportedError, ExceptionMessages::failedToExecute("getSources", "MediaStreamTrack", "Functionality not implemented yet"));
}

void MediaStreamTrack::stopTrack(ExceptionState& exceptionState)
{
    if (ended())
        return;

    m_readyState = MediaStreamSource::ReadyStateEnded;
    MediaStreamCenter::instance().didStopMediaStreamTrack(component());
    dispatchEvent(Event::create(EventTypeNames::ended));
    propagateTrackEnded();
}

PassRefPtr<MediaStreamTrack> MediaStreamTrack::clone(ExecutionContext* context)
{
    RefPtr<MediaStreamComponent> clonedComponent = MediaStreamComponent::create(component()->source());
    RefPtr<MediaStreamTrack> clonedTrack = MediaStreamTrack::create(context, clonedComponent.get());
    MediaStreamCenter::instance().didCreateMediaStreamTrack(clonedComponent.get());
    return clonedTrack.release();
}

bool MediaStreamTrack::ended() const
{
    return m_stopped || (m_readyState == MediaStreamSource::ReadyStateEnded);
}

void MediaStreamTrack::sourceChangedState()
{
    if (ended())
        return;

    m_readyState = m_component->source()->readyState();
    switch (m_readyState) {
    case MediaStreamSource::ReadyStateLive:
        dispatchEvent(Event::create(EventTypeNames::unmute));
        break;
    case MediaStreamSource::ReadyStateMuted:
        dispatchEvent(Event::create(EventTypeNames::mute));
        break;
    case MediaStreamSource::ReadyStateEnded:
        dispatchEvent(Event::create(EventTypeNames::ended));
        propagateTrackEnded();
        break;
    }
}

void MediaStreamTrack::propagateTrackEnded()
{
    RELEASE_ASSERT(!m_isIteratingObservers);
    m_isIteratingObservers = true;
    for (Vector<Observer*>::iterator iter = m_observers.begin(); iter != m_observers.end(); ++iter)
        (*iter)->trackEnded();
    m_isIteratingObservers = false;
}

MediaStreamComponent* MediaStreamTrack::component()
{
    return m_component.get();
}

void MediaStreamTrack::stop()
{
    m_stopped = true;
}

PassOwnPtr<AudioSourceProvider> MediaStreamTrack::createWebAudioSource()
{
    return MediaStreamCenter::instance().createWebAudioSourceFromMediaStreamTrack(component());
}

void MediaStreamTrack::addObserver(MediaStreamTrack::Observer* observer)
{
    RELEASE_ASSERT(!m_isIteratingObservers);
    m_observers.append(observer);
}

void MediaStreamTrack::removeObserver(MediaStreamTrack::Observer* observer)
{
    RELEASE_ASSERT(!m_isIteratingObservers);
    size_t pos = m_observers.find(observer);
    RELEASE_ASSERT(pos != kNotFound);
    m_observers.remove(pos);
}

const AtomicString& MediaStreamTrack::interfaceName() const
{
    return EventTargetNames::MediaStreamTrack;
}

ExecutionContext* MediaStreamTrack::executionContext() const
{
    return ActiveDOMObject::executionContext();
}

} // namespace WebCore