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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/core/v8/ExceptionMessages.h"
30 #include "core/dom/Document.h"
31 #include "core/dom/ExceptionCode.h"
32 #include "core/dom/ExecutionContext.h"
33 #include "core/events/Event.h"
34 #include "modules/mediastream/MediaStream.h"
35 #include "modules/mediastream/MediaStreamTrackSourcesCallback.h"
36 #include "modules/mediastream/MediaStreamTrackSourcesRequestImpl.h"
37 #include "modules/mediastream/UserMediaController.h"
38 #include "platform/mediastream/MediaStreamCenter.h"
39 #include "platform/mediastream/MediaStreamComponent.h"
40 #include "public/platform/WebSourceInfo.h"
41 
42 namespace blink {
43 
create(ExecutionContext * context,MediaStreamComponent * component)44 MediaStreamTrack* MediaStreamTrack::create(ExecutionContext* context, MediaStreamComponent* component)
45 {
46     MediaStreamTrack* track = adoptRefCountedGarbageCollectedWillBeNoop(new MediaStreamTrack(context, component));
47     track->suspendIfNeeded();
48     return track;
49 }
50 
MediaStreamTrack(ExecutionContext * context,MediaStreamComponent * component)51 MediaStreamTrack::MediaStreamTrack(ExecutionContext* context, MediaStreamComponent* component)
52     : ActiveDOMObject(context)
53     , m_readyState(MediaStreamSource::ReadyStateLive)
54     , m_isIteratingRegisteredMediaStreams(false)
55     , m_stopped(false)
56     , m_component(component)
57 {
58     m_component->source()->addObserver(this);
59 }
60 
~MediaStreamTrack()61 MediaStreamTrack::~MediaStreamTrack()
62 {
63     m_component->source()->removeObserver(this);
64 }
65 
kind() const66 String MediaStreamTrack::kind() const
67 {
68     DEFINE_STATIC_LOCAL(String, audioKind, ("audio"));
69     DEFINE_STATIC_LOCAL(String, videoKind, ("video"));
70 
71     switch (m_component->source()->type()) {
72     case MediaStreamSource::TypeAudio:
73         return audioKind;
74     case MediaStreamSource::TypeVideo:
75         return videoKind;
76     }
77 
78     ASSERT_NOT_REACHED();
79     return audioKind;
80 }
81 
id() const82 String MediaStreamTrack::id() const
83 {
84     return m_component->id();
85 }
86 
label() const87 String MediaStreamTrack::label() const
88 {
89     return m_component->source()->name();
90 }
91 
enabled() const92 bool MediaStreamTrack::enabled() const
93 {
94     return m_component->enabled();
95 }
96 
setEnabled(bool enabled)97 void MediaStreamTrack::setEnabled(bool enabled)
98 {
99     if (enabled == m_component->enabled())
100         return;
101 
102     m_component->setEnabled(enabled);
103 
104     if (!ended())
105         MediaStreamCenter::instance().didSetMediaStreamTrackEnabled(m_component.get());
106 }
107 
muted() const108 bool MediaStreamTrack::muted() const
109 {
110     return m_component->muted();
111 }
112 
readyState() const113 String MediaStreamTrack::readyState() const
114 {
115     if (ended())
116         return "ended";
117 
118     switch (m_readyState) {
119     case MediaStreamSource::ReadyStateLive:
120         return "live";
121     case MediaStreamSource::ReadyStateMuted:
122         return "muted";
123     case MediaStreamSource::ReadyStateEnded:
124         return "ended";
125     }
126 
127     ASSERT_NOT_REACHED();
128     return String();
129 }
130 
getSources(ExecutionContext * context,MediaStreamTrackSourcesCallback * callback,ExceptionState & exceptionState)131 void MediaStreamTrack::getSources(ExecutionContext* context, MediaStreamTrackSourcesCallback* callback, ExceptionState& exceptionState)
132 {
133     LocalFrame* frame = toDocument(context)->frame();
134     UserMediaController* userMedia = UserMediaController::from(frame);
135     if (!userMedia) {
136         exceptionState.throwDOMException(NotSupportedError, "No sources controller available; is this a detached window?");
137         return;
138     }
139     MediaStreamTrackSourcesRequest* request = MediaStreamTrackSourcesRequestImpl::create(*context, callback);
140     userMedia->requestSources(request);
141 }
142 
stopTrack(ExceptionState & exceptionState)143 void MediaStreamTrack::stopTrack(ExceptionState& exceptionState)
144 {
145     if (ended())
146         return;
147 
148     m_readyState = MediaStreamSource::ReadyStateEnded;
149     MediaStreamCenter::instance().didStopMediaStreamTrack(component());
150     dispatchEvent(Event::create(EventTypeNames::ended));
151     propagateTrackEnded();
152 }
153 
clone(ExecutionContext * context)154 MediaStreamTrack* MediaStreamTrack::clone(ExecutionContext* context)
155 {
156     RefPtr<MediaStreamComponent> clonedComponent = MediaStreamComponent::create(component()->source());
157     MediaStreamTrack* clonedTrack = MediaStreamTrack::create(context, clonedComponent.get());
158     MediaStreamCenter::instance().didCreateMediaStreamTrack(clonedComponent.get());
159     return clonedTrack;
160 }
161 
ended() const162 bool MediaStreamTrack::ended() const
163 {
164     return m_stopped || (m_readyState == MediaStreamSource::ReadyStateEnded);
165 }
166 
sourceChangedState()167 void MediaStreamTrack::sourceChangedState()
168 {
169     if (ended())
170         return;
171 
172     m_readyState = m_component->source()->readyState();
173     switch (m_readyState) {
174     case MediaStreamSource::ReadyStateLive:
175         dispatchEvent(Event::create(EventTypeNames::unmute));
176         break;
177     case MediaStreamSource::ReadyStateMuted:
178         dispatchEvent(Event::create(EventTypeNames::mute));
179         break;
180     case MediaStreamSource::ReadyStateEnded:
181         dispatchEvent(Event::create(EventTypeNames::ended));
182         propagateTrackEnded();
183         break;
184     }
185 }
186 
propagateTrackEnded()187 void MediaStreamTrack::propagateTrackEnded()
188 {
189     RELEASE_ASSERT(!m_isIteratingRegisteredMediaStreams);
190     m_isIteratingRegisteredMediaStreams = true;
191     for (HeapHashSet<Member<MediaStream> >::iterator iter = m_registeredMediaStreams.begin(); iter != m_registeredMediaStreams.end(); ++iter)
192         (*iter)->trackEnded();
193     m_isIteratingRegisteredMediaStreams = false;
194 }
195 
component()196 MediaStreamComponent* MediaStreamTrack::component()
197 {
198     return m_component.get();
199 }
200 
stop()201 void MediaStreamTrack::stop()
202 {
203     m_stopped = true;
204 }
205 
createWebAudioSource()206 PassOwnPtr<AudioSourceProvider> MediaStreamTrack::createWebAudioSource()
207 {
208     return MediaStreamCenter::instance().createWebAudioSourceFromMediaStreamTrack(component());
209 }
210 
registerMediaStream(MediaStream * mediaStream)211 void MediaStreamTrack::registerMediaStream(MediaStream* mediaStream)
212 {
213     RELEASE_ASSERT(!m_isIteratingRegisteredMediaStreams);
214     RELEASE_ASSERT(!m_registeredMediaStreams.contains(mediaStream));
215     m_registeredMediaStreams.add(mediaStream);
216 }
217 
unregisterMediaStream(MediaStream * mediaStream)218 void MediaStreamTrack::unregisterMediaStream(MediaStream* mediaStream)
219 {
220     RELEASE_ASSERT(!m_isIteratingRegisteredMediaStreams);
221     HeapHashSet<Member<MediaStream> >::iterator iter = m_registeredMediaStreams.find(mediaStream);
222     RELEASE_ASSERT(iter != m_registeredMediaStreams.end());
223     m_registeredMediaStreams.remove(iter);
224 }
225 
interfaceName() const226 const AtomicString& MediaStreamTrack::interfaceName() const
227 {
228     return EventTargetNames::MediaStreamTrack;
229 }
230 
executionContext() const231 ExecutionContext* MediaStreamTrack::executionContext() const
232 {
233     return ActiveDOMObject::executionContext();
234 }
235 
trace(Visitor * visitor)236 void MediaStreamTrack::trace(Visitor* visitor)
237 {
238     visitor->trace(m_registeredMediaStreams);
239     EventTargetWithInlineData::trace(visitor);
240 }
241 
242 } // namespace blink
243