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
42namespace blink {
43
44MediaStreamTrack* MediaStreamTrack::create(ExecutionContext* context, MediaStreamComponent* component)
45{
46    MediaStreamTrack* track = adoptRefCountedGarbageCollectedWillBeNoop(new MediaStreamTrack(context, component));
47    track->suspendIfNeeded();
48    return track;
49}
50
51MediaStreamTrack::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
61MediaStreamTrack::~MediaStreamTrack()
62{
63    m_component->source()->removeObserver(this);
64}
65
66String 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
82String MediaStreamTrack::id() const
83{
84    return m_component->id();
85}
86
87String MediaStreamTrack::label() const
88{
89    return m_component->source()->name();
90}
91
92bool MediaStreamTrack::enabled() const
93{
94    return m_component->enabled();
95}
96
97void 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
108bool MediaStreamTrack::muted() const
109{
110    return m_component->muted();
111}
112
113String 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
131void 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
143void 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
154MediaStreamTrack* 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
162bool MediaStreamTrack::ended() const
163{
164    return m_stopped || (m_readyState == MediaStreamSource::ReadyStateEnded);
165}
166
167void 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
187void 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
196MediaStreamComponent* MediaStreamTrack::component()
197{
198    return m_component.get();
199}
200
201void MediaStreamTrack::stop()
202{
203    m_stopped = true;
204}
205
206PassOwnPtr<AudioSourceProvider> MediaStreamTrack::createWebAudioSource()
207{
208    return MediaStreamCenter::instance().createWebAudioSourceFromMediaStreamTrack(component());
209}
210
211void MediaStreamTrack::registerMediaStream(MediaStream* mediaStream)
212{
213    RELEASE_ASSERT(!m_isIteratingRegisteredMediaStreams);
214    RELEASE_ASSERT(!m_registeredMediaStreams.contains(mediaStream));
215    m_registeredMediaStreams.add(mediaStream);
216}
217
218void 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
226const AtomicString& MediaStreamTrack::interfaceName() const
227{
228    return EventTargetNames::MediaStreamTrack;
229}
230
231ExecutionContext* MediaStreamTrack::executionContext() const
232{
233    return ActiveDOMObject::executionContext();
234}
235
236void MediaStreamTrack::trace(Visitor* visitor)
237{
238    visitor->trace(m_registeredMediaStreams);
239    EventTargetWithInlineData::trace(visitor);
240}
241
242} // namespace blink
243