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/*
* Copyright (C) 2010 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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 "platform/audio/AudioDSPKernelProcessor.h"
#include "platform/audio/AudioDSPKernel.h"
#include "wtf/MainThread.h"
namespace blink {
// setNumberOfChannels() may later be called if the object is not yet in an "initialized" state.
AudioDSPKernelProcessor::AudioDSPKernelProcessor(float sampleRate, unsigned numberOfChannels)
: AudioProcessor(sampleRate, numberOfChannels)
, m_hasJustReset(true)
{
}
void AudioDSPKernelProcessor::initialize()
{
if (isInitialized())
return;
MutexLocker locker(m_processLock);
ASSERT(!m_kernels.size());
// Create processing kernels, one per channel.
for (unsigned i = 0; i < numberOfChannels(); ++i)
m_kernels.append(createKernel());
m_initialized = true;
m_hasJustReset = true;
}
void AudioDSPKernelProcessor::uninitialize()
{
if (!isInitialized())
return;
MutexLocker locker(m_processLock);
m_kernels.clear();
m_initialized = false;
}
void AudioDSPKernelProcessor::process(const AudioBus* source, AudioBus* destination, size_t framesToProcess)
{
ASSERT(source && destination);
if (!source || !destination)
return;
if (!isInitialized()) {
destination->zero();
return;
}
MutexTryLocker tryLocker(m_processLock);
if (tryLocker.locked()) {
bool channelCountMatches = source->numberOfChannels() == destination->numberOfChannels() && source->numberOfChannels() == m_kernels.size();
ASSERT(channelCountMatches);
if (!channelCountMatches)
return;
for (unsigned i = 0; i < m_kernels.size(); ++i)
m_kernels[i]->process(source->channel(i)->data(), destination->channel(i)->mutableData(), framesToProcess);
} else {
// Unfortunately, the kernel is being processed by another thread.
// See also ConvolverNode::process().
destination->zero();
}
}
// Resets filter state
void AudioDSPKernelProcessor::reset()
{
ASSERT(isMainThread());
if (!isInitialized())
return;
// Forces snap to parameter values - first time.
// Any processing depending on this value must set it to false at the appropriate time.
m_hasJustReset = true;
MutexLocker locker(m_processLock);
for (unsigned i = 0; i < m_kernels.size(); ++i)
m_kernels[i]->reset();
}
void AudioDSPKernelProcessor::setNumberOfChannels(unsigned numberOfChannels)
{
if (numberOfChannels == m_numberOfChannels)
return;
ASSERT(!isInitialized());
if (!isInitialized())
m_numberOfChannels = numberOfChannels;
}
double AudioDSPKernelProcessor::tailTime() const
{
ASSERT(!isMainThread());
MutexTryLocker tryLocker(m_processLock);
if (tryLocker.locked()) {
// It is expected that all the kernels have the same tailTime.
return !m_kernels.isEmpty() ? m_kernels.first()->tailTime() : 0;
}
// Since we don't want to block the Audio Device thread, we return a large value
// instead of trying to acquire the lock.
return std::numeric_limits<double>::infinity();
}
double AudioDSPKernelProcessor::latencyTime() const
{
ASSERT(!isMainThread());
MutexTryLocker tryLocker(m_processLock);
if (tryLocker.locked()) {
// It is expected that all the kernels have the same latencyTime.
return !m_kernels.isEmpty() ? m_kernels.first()->latencyTime() : 0;
}
// Since we don't want to block the Audio Device thread, we return a large value
// instead of trying to acquire the lock.
return std::numeric_limits<double>::infinity();
}
} // namespace blink
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