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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:
* 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/DelayDSPKernel.h"
#if ENABLE(WEB_AUDIO)
#include "platform/audio/AudioUtilities.h"
#include "wtf/MathExtras.h"
#include <algorithm>
namespace blink {
const float SmoothingTimeConstant = 0.020f; // 20ms
DelayDSPKernel::DelayDSPKernel(DelayProcessor* processor)
: AudioDelayDSPKernel(processor, AudioHandler::ProcessingSizeInFrames)
{
ASSERT(processor);
ASSERT(processor->sampleRate() > 0);
if (!(processor && processor->sampleRate() > 0))
return;
m_maxDelayTime = processor->maxDelayTime();
ASSERT(m_maxDelayTime >= 0);
ASSERT(!std::isnan(m_maxDelayTime));
if (m_maxDelayTime < 0 || std::isnan(m_maxDelayTime))
return;
m_buffer.allocate(bufferLengthForDelay(m_maxDelayTime, processor->sampleRate()));
m_buffer.zero();
m_smoothingRate = AudioUtilities::discreteTimeConstantForSampleRate(SmoothingTimeConstant, processor->sampleRate());
}
bool DelayDSPKernel::hasSampleAccurateValues()
{
return delayProcessor()->delayTime().hasSampleAccurateValues();
}
void DelayDSPKernel::calculateSampleAccurateValues(float* delayTimes, size_t framesToProcess)
{
delayProcessor()->delayTime().calculateSampleAccurateValues(delayTimes, framesToProcess);
}
double DelayDSPKernel::delayTime(float)
{
return delayProcessor()->delayTime().finalValue();
}
} // namespace blink
#endif // ENABLE(WEB_AUDIO)
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