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
40namespace blink {
41
42MediaStreamWebAudioSource::MediaStreamWebAudioSource(PassOwnPtr<blink::WebAudioSourceProvider> provider)
43    : m_webAudioSourceProvider(provider)
44{
45}
46
47MediaStreamWebAudioSource::~MediaStreamWebAudioSource()
48{
49}
50
51void 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