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29 #include "modules/webaudio/DelayDSPKernel.h"
31 #include "platform/audio/AudioUtilities.h"
32 #include "wtf/MathExtras.h"
39 const float SmoothingTimeConstant = 0.020f; // 20ms
41 DelayDSPKernel::DelayDSPKernel(DelayProcessor* processor)
42 : AudioDelayDSPKernel(processor, AudioNode::ProcessingSizeInFrames)
44 ASSERT(processor && processor->sampleRate() > 0);
45 if (!(processor && processor->sampleRate() > 0))
48 m_maxDelayTime = processor->maxDelayTime();
49 ASSERT(m_maxDelayTime >= 0 && !std::isnan(m_maxDelayTime));
50 if (m_maxDelayTime < 0 || std::isnan(m_maxDelayTime))
53 m_buffer.allocate(bufferLengthForDelay(m_maxDelayTime, processor->sampleRate()));
56 m_smoothingRate = AudioUtilities::discreteTimeConstantForSampleRate(SmoothingTimeConstant, processor->sampleRate());
59 bool DelayDSPKernel::hasSampleAccurateValues()
61 return delayProcessor()->delayTime()->hasSampleAccurateValues();
64 void DelayDSPKernel::calculateSampleAccurateValues(float* delayTimes, size_t framesToProcess)
66 delayProcessor()->delayTime()->calculateSampleAccurateValues(delayTimes, framesToProcess);
69 double DelayDSPKernel::delayTime(float)
71 return delayProcessor()->delayTime()->finalValue();
74 } // namespace WebCore
76 #endif // ENABLE(WEB_AUDIO)