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
36namespace blink {
37
38MediaStreamAudioDestinationNode* MediaStreamAudioDestinationNode::create(AudioContext* context, size_t numberOfChannels)
39{
40    return adoptRefCountedGarbageCollectedWillBeNoop(new MediaStreamAudioDestinationNode(context, numberOfChannels));
41}
42
43MediaStreamAudioDestinationNode::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
61MediaStreamAudioDestinationNode::~MediaStreamAudioDestinationNode()
62{
63    ASSERT(!isInitialized());
64}
65
66void MediaStreamAudioDestinationNode::dispose()
67{
68    uninitialize();
69    AudioBasicInspectorNode::dispose();
70}
71
72void MediaStreamAudioDestinationNode::trace(Visitor* visitor)
73{
74    visitor->trace(m_stream);
75    AudioBasicInspectorNode::trace(visitor);
76}
77
78void 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