1/*
2 * Copyright (C) 2011 Google Inc. All rights reserved.
3 * Copyright (C) 2011 Ericsson AB. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
21 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
23 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "modules/mediastream/MediaStreamTrack.h"
28
29#include "bindings/v8/ExceptionMessages.h"
30#include "core/dom/ExceptionCode.h"
31#include "core/dom/ExecutionContext.h"
32#include "modules/mediastream/MediaStream.h"
33#include "modules/mediastream/MediaStreamTrackSourcesCallback.h"
34#include "modules/mediastream/MediaStreamTrackSourcesRequestImpl.h"
35#include "platform/mediastream/MediaStreamCenter.h"
36#include "platform/mediastream/MediaStreamComponent.h"
37#include "public/platform/WebSourceInfo.h"
38
39namespace WebCore {
40
41PassRefPtrWillBeRawPtr<MediaStreamTrack> MediaStreamTrack::create(ExecutionContext* context, MediaStreamComponent* component)
42{
43    RefPtrWillBeRawPtr<MediaStreamTrack> track = adoptRefWillBeRefCountedGarbageCollected(new MediaStreamTrack(context, component));
44    track->suspendIfNeeded();
45    return track.release();
46}
47
48MediaStreamTrack::MediaStreamTrack(ExecutionContext* context, MediaStreamComponent* component)
49    : ActiveDOMObject(context)
50    , m_readyState(MediaStreamSource::ReadyStateLive)
51    , m_isIteratingRegisteredMediaStreams(false)
52    , m_stopped(false)
53    , m_component(component)
54{
55    ScriptWrappable::init(this);
56    m_component->source()->addObserver(this);
57}
58
59MediaStreamTrack::~MediaStreamTrack()
60{
61    m_component->source()->removeObserver(this);
62}
63
64String MediaStreamTrack::kind() const
65{
66    DEFINE_STATIC_LOCAL(String, audioKind, ("audio"));
67    DEFINE_STATIC_LOCAL(String, videoKind, ("video"));
68
69    switch (m_component->source()->type()) {
70    case MediaStreamSource::TypeAudio:
71        return audioKind;
72    case MediaStreamSource::TypeVideo:
73        return videoKind;
74    }
75
76    ASSERT_NOT_REACHED();
77    return audioKind;
78}
79
80String MediaStreamTrack::id() const
81{
82    return m_component->id();
83}
84
85String MediaStreamTrack::label() const
86{
87    return m_component->source()->name();
88}
89
90bool MediaStreamTrack::enabled() const
91{
92    return m_component->enabled();
93}
94
95void MediaStreamTrack::setEnabled(bool enabled)
96{
97    if (enabled == m_component->enabled())
98        return;
99
100    m_component->setEnabled(enabled);
101
102    if (!ended())
103        MediaStreamCenter::instance().didSetMediaStreamTrackEnabled(m_component.get());
104}
105
106String MediaStreamTrack::readyState() const
107{
108    if (ended())
109        return "ended";
110
111    switch (m_readyState) {
112    case MediaStreamSource::ReadyStateLive:
113        return "live";
114    case MediaStreamSource::ReadyStateMuted:
115        return "muted";
116    case MediaStreamSource::ReadyStateEnded:
117        return "ended";
118    }
119
120    ASSERT_NOT_REACHED();
121    return String();
122}
123
124void MediaStreamTrack::getSources(ExecutionContext* context, PassOwnPtr<MediaStreamTrackSourcesCallback> callback, ExceptionState& exceptionState)
125{
126    RefPtrWillBeRawPtr<MediaStreamTrackSourcesRequest> request = MediaStreamTrackSourcesRequestImpl::create(context->securityOrigin()->toString(), callback);
127    if (!MediaStreamCenter::instance().getMediaStreamTrackSources(request.release()))
128        exceptionState.throwDOMException(NotSupportedError, ExceptionMessages::failedToExecute("getSources", "MediaStreamTrack", "Functionality not implemented yet"));
129}
130
131void MediaStreamTrack::stopTrack(ExceptionState& exceptionState)
132{
133    if (ended())
134        return;
135
136    m_readyState = MediaStreamSource::ReadyStateEnded;
137    MediaStreamCenter::instance().didStopMediaStreamTrack(component());
138    dispatchEvent(Event::create(EventTypeNames::ended));
139    propagateTrackEnded();
140}
141
142PassRefPtrWillBeRawPtr<MediaStreamTrack> MediaStreamTrack::clone(ExecutionContext* context)
143{
144    RefPtr<MediaStreamComponent> clonedComponent = MediaStreamComponent::create(component()->source());
145    RefPtrWillBeRawPtr<MediaStreamTrack> clonedTrack = MediaStreamTrack::create(context, clonedComponent.get());
146    MediaStreamCenter::instance().didCreateMediaStreamTrack(clonedComponent.get());
147    return clonedTrack.release();
148}
149
150bool MediaStreamTrack::ended() const
151{
152    return m_stopped || (m_readyState == MediaStreamSource::ReadyStateEnded);
153}
154
155void MediaStreamTrack::sourceChangedState()
156{
157    if (ended())
158        return;
159
160    m_readyState = m_component->source()->readyState();
161    switch (m_readyState) {
162    case MediaStreamSource::ReadyStateLive:
163        dispatchEvent(Event::create(EventTypeNames::unmute));
164        break;
165    case MediaStreamSource::ReadyStateMuted:
166        dispatchEvent(Event::create(EventTypeNames::mute));
167        break;
168    case MediaStreamSource::ReadyStateEnded:
169        dispatchEvent(Event::create(EventTypeNames::ended));
170        propagateTrackEnded();
171        break;
172    }
173}
174
175void MediaStreamTrack::propagateTrackEnded()
176{
177    RELEASE_ASSERT(!m_isIteratingRegisteredMediaStreams);
178    m_isIteratingRegisteredMediaStreams = true;
179    for (WillBeHeapHashSet<RawPtrWillBeMember<MediaStream> >::iterator iter = m_registeredMediaStreams.begin(); iter != m_registeredMediaStreams.end(); ++iter)
180        (*iter)->trackEnded();
181    m_isIteratingRegisteredMediaStreams = false;
182}
183
184MediaStreamComponent* MediaStreamTrack::component()
185{
186    return m_component.get();
187}
188
189void MediaStreamTrack::stop()
190{
191    m_stopped = true;
192}
193
194PassOwnPtr<AudioSourceProvider> MediaStreamTrack::createWebAudioSource()
195{
196    return MediaStreamCenter::instance().createWebAudioSourceFromMediaStreamTrack(component());
197}
198
199void MediaStreamTrack::registerMediaStream(MediaStream* mediaStream)
200{
201    RELEASE_ASSERT(!m_isIteratingRegisteredMediaStreams);
202    RELEASE_ASSERT(!m_registeredMediaStreams.contains(mediaStream));
203    m_registeredMediaStreams.add(mediaStream);
204}
205
206void MediaStreamTrack::unregisterMediaStream(MediaStream* mediaStream)
207{
208    RELEASE_ASSERT(!m_isIteratingRegisteredMediaStreams);
209    WillBeHeapHashSet<RawPtrWillBeMember<MediaStream> >::iterator iter = m_registeredMediaStreams.find(mediaStream);
210    RELEASE_ASSERT(iter != m_registeredMediaStreams.end());
211    m_registeredMediaStreams.remove(iter);
212}
213
214const AtomicString& MediaStreamTrack::interfaceName() const
215{
216    return EventTargetNames::MediaStreamTrack;
217}
218
219ExecutionContext* MediaStreamTrack::executionContext() const
220{
221    return ActiveDOMObject::executionContext();
222}
223
224void MediaStreamTrack::trace(Visitor* visitor)
225{
226    visitor->trace(m_registeredMediaStreams);
227    EventTargetWithInlineData::trace(visitor);
228}
229
230} // namespace WebCore
231