1 /*
2 * Copyright (C) 2012, Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25 #include "config.h"
26 #if ENABLE(WEB_AUDIO)
27 #include "modules/webaudio/MediaStreamAudioDestinationNode.h"
28
29 #include "modules/webaudio/AudioContext.h"
30 #include "modules/webaudio/AudioNodeInput.h"
31 #include "platform/UUID.h"
32 #include "platform/mediastream/MediaStreamCenter.h"
33 #include "public/platform/WebRTCPeerConnectionHandler.h"
34 #include "wtf/Locker.h"
35
36 namespace blink {
37
create(AudioContext * context,size_t numberOfChannels)38 MediaStreamAudioDestinationNode* MediaStreamAudioDestinationNode::create(AudioContext* context, size_t numberOfChannels)
39 {
40 return adoptRefCountedGarbageCollectedWillBeNoop(new MediaStreamAudioDestinationNode(context, numberOfChannels));
41 }
42
MediaStreamAudioDestinationNode(AudioContext * context,size_t numberOfChannels)43 MediaStreamAudioDestinationNode::MediaStreamAudioDestinationNode(AudioContext* context, size_t numberOfChannels)
44 : AudioBasicInspectorNode(context, context->sampleRate(), numberOfChannels)
45 , m_mixBus(AudioBus::create(numberOfChannels, ProcessingSizeInFrames))
46 {
47 setNodeType(NodeTypeMediaStreamAudioDestination);
48
49 m_source = MediaStreamSource::create("WebAudio-" + createCanonicalUUIDString(), MediaStreamSource::TypeAudio, "MediaStreamAudioDestinationNode", MediaStreamSource::ReadyStateLive, true);
50 MediaStreamSourceVector audioSources;
51 audioSources.append(m_source);
52 MediaStreamSourceVector videoSources;
53 m_stream = MediaStream::create(context->executionContext(), MediaStreamDescriptor::create(audioSources, videoSources));
54 MediaStreamCenter::instance().didCreateMediaStreamAndTracks(m_stream->descriptor());
55
56 m_source->setAudioFormat(numberOfChannels, context->sampleRate());
57
58 initialize();
59 }
60
~MediaStreamAudioDestinationNode()61 MediaStreamAudioDestinationNode::~MediaStreamAudioDestinationNode()
62 {
63 ASSERT(!isInitialized());
64 }
65
dispose()66 void MediaStreamAudioDestinationNode::dispose()
67 {
68 uninitialize();
69 AudioBasicInspectorNode::dispose();
70 }
71
trace(Visitor * visitor)72 void MediaStreamAudioDestinationNode::trace(Visitor* visitor)
73 {
74 visitor->trace(m_stream);
75 AudioBasicInspectorNode::trace(visitor);
76 }
77
process(size_t numberOfFrames)78 void MediaStreamAudioDestinationNode::process(size_t numberOfFrames)
79 {
80 m_mixBus->copyFrom(*input(0)->bus());
81 m_source->consumeAudio(m_mixBus.get(), numberOfFrames);
82 }
83
84 } // namespace blink
85
86 #endif // ENABLE(WEB_AUDIO)
87