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/*
* Copyright (C) 2012 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(WEB_AUDIO)
#include "AudioPullFIFO.h"
namespace WebCore {
AudioPullFIFO::AudioPullFIFO(AudioSourceProvider& audioProvider, unsigned numberOfChannels, size_t fifoLength, size_t providerSize)
: m_provider(audioProvider)
, m_fifo(numberOfChannels, fifoLength)
, m_providerSize(providerSize)
, m_tempBus(AudioBus::create(numberOfChannels, providerSize))
{
}
void AudioPullFIFO::consume(AudioBus* destination, size_t framesToConsume)
{
if (!destination)
return;
if (framesToConsume > m_fifo.framesInFifo()) {
// We don't have enough data in the FIFO to fulfill the request. Ask for more data.
fillBuffer(framesToConsume - m_fifo.framesInFifo());
}
m_fifo.consume(destination, framesToConsume);
}
void AudioPullFIFO::fillBuffer(size_t numberOfFrames)
{
// Keep asking the provider to give us data until we have received at least |numberOfFrames| of
// data. Stuff the data into the FIFO.
size_t framesProvided = 0;
while (framesProvided < numberOfFrames) {
m_provider.provideInput(m_tempBus.get(), m_providerSize);
m_fifo.push(m_tempBus.get());
framesProvided += m_providerSize;
}
}
} // namespace WebCore
#endif // ENABLE(WEB_AUDIO)
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