1/*
2 * Copyright (C) 2011 Ericsson AB. All rights reserved.
3 * Copyright (C) 2013 Google Inc. 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 are
7 * met:
8 *
9 *     * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *     * Redistributions in binary form must reproduce the above
12 * copyright notice, this list of conditions and the following disclaimer
13 * in the documentation and/or other materials provided with the
14 * distribution.
15 *     * Neither the name of Google Inc. nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include "config.h"
33
34#include "platform/mediastream/MediaStreamComponent.h"
35
36#include "platform/UUID.h"
37#include "platform/audio/AudioBus.h"
38#include "platform/mediastream/MediaStreamSource.h"
39#include "public/platform/WebAudioSourceProvider.h"
40
41namespace blink {
42
43PassRefPtr<MediaStreamComponent> MediaStreamComponent::create(PassRefPtr<MediaStreamSource> source)
44{
45    return adoptRef(new MediaStreamComponent(createCanonicalUUIDString(), source));
46}
47
48PassRefPtr<MediaStreamComponent> MediaStreamComponent::create(const String& id, PassRefPtr<MediaStreamSource> source)
49{
50    return adoptRef(new MediaStreamComponent(id, source));
51}
52
53MediaStreamComponent::MediaStreamComponent(const String& id, PassRefPtr<MediaStreamSource> source)
54    : m_source(source)
55    , m_id(id)
56    , m_enabled(true)
57    , m_muted(false)
58{
59    ASSERT(m_id.length());
60}
61
62#if ENABLE(WEB_AUDIO)
63void MediaStreamComponent::AudioSourceProviderImpl::wrap(blink::WebAudioSourceProvider* provider)
64{
65    MutexLocker locker(m_provideInputLock);
66    m_webAudioSourceProvider = provider;
67}
68
69void MediaStreamComponent::AudioSourceProviderImpl::provideInput(AudioBus* bus, size_t framesToProcess)
70{
71    ASSERT(bus);
72    if (!bus)
73        return;
74
75    MutexTryLocker tryLocker(m_provideInputLock);
76    if (!tryLocker.locked() || !m_webAudioSourceProvider) {
77        bus->zero();
78        return;
79    }
80
81    // Wrap the AudioBus channel data using WebVector.
82    size_t n = bus->numberOfChannels();
83    blink::WebVector<float*> webAudioData(n);
84    for (size_t i = 0; i < n; ++i)
85        webAudioData[i] = bus->channel(i)->mutableData();
86
87    m_webAudioSourceProvider->provideInput(webAudioData, framesToProcess);
88}
89#endif // #if ENABLE(WEB_AUDIO)
90
91} // namespace blink
92
93