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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 * | |
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 in the | |
12 * documentation and/or other materials provided with the distribution. | |
13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of | |
14 * its contributors may be used to endorse or promote products derived | |
15 * from this software without specific prior written permission. | |
16 * | |
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY | |
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY | |
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | |
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
27 */ | |
28 | |
29 #include "platform/audio/AudioPullFIFO.h" | |
30 | |
31 namespace blink { | |
32 | |
33 AudioPullFIFO::AudioPullFIFO(AudioSourceProvider& audioProvider, | |
34 unsigned numberOfChannels, | |
35 size_t fifoLength, | |
36 size_t providerSize) | |
37 : m_provider(audioProvider), | |
38 m_fifo(numberOfChannels, fifoLength), | |
39 m_providerSize(providerSize), | |
40 m_tempBus(AudioBus::create(numberOfChannels, providerSize)) {} | |
41 | |
42 void AudioPullFIFO::consume(AudioBus* destination, size_t framesToConsume) { | |
43 if (!destination) | |
44 return; | |
45 | |
46 if (framesToConsume > m_fifo.framesInFifo()) { | |
47 // We don't have enough data in the FIFO to fulfill the request. Ask for | |
48 // more data. | |
49 fillBuffer(framesToConsume - m_fifo.framesInFifo()); | |
50 } | |
51 | |
52 m_fifo.consume(destination, framesToConsume); | |
53 } | |
54 | |
55 void AudioPullFIFO::fillBuffer(size_t numberOfFrames) { | |
56 // Keep asking the provider to give us data until we have received at least | |
57 // |numberOfFrames| of data. Stuff the data into the FIFO. | |
58 size_t framesProvided = 0; | |
59 | |
60 while (framesProvided < numberOfFrames) { | |
61 m_provider.provideInput(m_tempBus.get(), m_providerSize); | |
62 | |
63 m_fifo.push(m_tempBus.get()); | |
64 | |
65 framesProvided += m_providerSize; | |
66 } | |
67 } | |
68 | |
69 } // namespace blink | |
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