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1 /*
2  * Copyright 2014 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  *
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
12  *    in the documentation and/or other materials provided with the
13  *    distribution.
14  * 3. Neither the name of Google Inc. nor the names of its contributors
15  *    may be used to endorse or promote products derived from this
16  *    software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 
31 #include "config.h"
32 
33 #if ENABLE(WEB_AUDIO)
34 
35 #include "platform/mediastream/MediaStreamWebAudioSource.h"
36 
37 #include "platform/audio/AudioBus.h"
38 #include "public/platform/WebAudioSourceProvider.h"
39 
40 namespace blink {
41 
MediaStreamWebAudioSource(PassOwnPtr<blink::WebAudioSourceProvider> provider)42 MediaStreamWebAudioSource::MediaStreamWebAudioSource(PassOwnPtr<blink::WebAudioSourceProvider> provider)
43     : m_webAudioSourceProvider(provider)
44 {
45 }
46 
~MediaStreamWebAudioSource()47 MediaStreamWebAudioSource::~MediaStreamWebAudioSource()
48 {
49 }
50 
provideInput(AudioBus * bus,size_t framesToProcess)51 void MediaStreamWebAudioSource::provideInput(AudioBus* bus, size_t framesToProcess)
52 {
53     ASSERT(bus);
54     if (!bus)
55         return;
56 
57     if (!m_webAudioSourceProvider) {
58         bus->zero();
59         return;
60     }
61 
62     // Wrap the AudioBus channel data using WebVector.
63     size_t n = bus->numberOfChannels();
64     blink::WebVector<float*> webAudioData(n);
65     for (size_t i = 0; i < n; ++i)
66         webAudioData[i] = bus->channel(i)->mutableData();
67 
68     m_webAudioSourceProvider->provideInput(webAudioData, framesToProcess);
69 }
70 
71 } // namespace blink
72 
73 #endif // ENABLE(WEB_AUDIO)
74