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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.
*/
#ifndef AudioDelayDSPKernel_h
#define AudioDelayDSPKernel_h
#include "platform/audio/AudioArray.h"
#include "platform/audio/AudioDSPKernel.h"
namespace blink {
class PLATFORM_EXPORT AudioDelayDSPKernel : public AudioDSPKernel {
public:
AudioDelayDSPKernel(double maxDelayTime, float sampleRate);
void process(const float* source,
float* destination,
size_t framesToProcess) override;
void reset() override;
double maxDelayTime() const { return m_maxDelayTime; }
void setDelayFrames(double numberOfFrames) {
m_desiredDelayFrames = numberOfFrames;
}
double tailTime() const override;
double latencyTime() const override;
protected:
AudioDelayDSPKernel(AudioDSPKernelProcessor*, size_t processingSizeInFrames);
virtual bool hasSampleAccurateValues();
virtual void calculateSampleAccurateValues(float* delayTimes,
size_t framesToProcess);
virtual double delayTime(float sampleRate);
AudioFloatArray m_buffer;
double m_maxDelayTime;
int m_writeIndex;
double m_currentDelayTime;
double m_smoothingRate;
bool m_firstTime;
double m_desiredDelayFrames;
AudioFloatArray m_delayTimes;
size_t bufferLengthForDelay(double delayTime, double sampleRate) const;
};
} // namespace blink
#endif // AudioDelayDSPKernel_h
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