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/*
* Copyright (C) 2011, 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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 "modules/webaudio/WaveShaperProcessor.h"
#include "modules/webaudio/WaveShaperDSPKernel.h"
namespace blink {
WaveShaperProcessor::WaveShaperProcessor(float sampleRate, size_t numberOfChannels)
: AudioDSPKernelProcessor(sampleRate, numberOfChannels)
, m_oversample(OverSampleNone)
{
}
WaveShaperProcessor::~WaveShaperProcessor()
{
if (isInitialized())
uninitialize();
}
PassOwnPtr<AudioDSPKernel> WaveShaperProcessor::createKernel()
{
return adoptPtr(new WaveShaperDSPKernel(this));
}
void WaveShaperProcessor::setCurve(DOMFloat32Array* curve)
{
// This synchronizes with process().
MutexLocker processLocker(m_processLock);
m_curve = curve;
}
void WaveShaperProcessor::setOversample(OverSampleType oversample)
{
// This synchronizes with process().
MutexLocker processLocker(m_processLock);
m_oversample = oversample;
if (oversample != OverSampleNone) {
for (unsigned i = 0; i < m_kernels.size(); ++i) {
WaveShaperDSPKernel* kernel = static_cast<WaveShaperDSPKernel*>(m_kernels[i].get());
kernel->lazyInitializeOversampling();
}
}
}
void WaveShaperProcessor::process(const AudioBus* source, AudioBus* destination, size_t framesToProcess)
{
if (!isInitialized()) {
destination->zero();
return;
}
bool channelCountMatches = source->numberOfChannels() == destination->numberOfChannels() && source->numberOfChannels() == m_kernels.size();
ASSERT(channelCountMatches);
if (!channelCountMatches)
return;
// The audio thread can't block on this lock, so we call tryLock() instead.
MutexTryLocker tryLocker(m_processLock);
if (tryLocker.locked()) {
// For each channel of our input, process using the corresponding WaveShaperDSPKernel into the output channel.
for (unsigned i = 0; i < m_kernels.size(); ++i)
m_kernels[i]->process(source->channel(i)->data(), destination->channel(i)->mutableData(), framesToProcess);
} else {
// Too bad - the tryLock() failed. We must be in the middle of a setCurve() call.
destination->zero();
}
}
} // namespace blink
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