2
* Copyright (C) 2012 Google Inc. All rights reserved.
4
* Redistribution and use in source and binary forms, with or without
5
* modification, are permitted provided that the following conditions
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.
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.
33
#include "AudioPullFIFO.h"
37
AudioPullFIFO::AudioPullFIFO(AudioSourceProvider& audioProvider, unsigned numberOfChannels, size_t fifoLength, size_t providerSize)
38
: m_provider(audioProvider)
39
, m_fifo(numberOfChannels, fifoLength)
40
, m_providerSize(providerSize)
41
, m_tempBus(numberOfChannels, providerSize)
45
void AudioPullFIFO::consume(AudioBus* destination, size_t framesToConsume)
50
if (framesToConsume > m_fifo.framesInFifo()) {
51
// We don't have enough data in the FIFO to fulfill the request. Ask for more data.
52
fillBuffer(framesToConsume - m_fifo.framesInFifo());
55
m_fifo.consume(destination, framesToConsume);
58
void AudioPullFIFO::fillBuffer(size_t numberOfFrames)
60
// Keep asking the provider to give us data until we have received at least |numberOfFrames| of
61
// data. Stuff the data into the FIFO.
62
size_t framesProvided = 0;
64
while (framesProvided < numberOfFrames) {
65
m_provider.provideInput(&m_tempBus, m_providerSize);
67
m_fifo.push(&m_tempBus);
69
framesProvided += m_providerSize;
73
} // namespace WebCore
75
#endif // ENABLE(WEB_AUDIO)