/*
* 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
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* 2. Redistributions in binary form must reproduce the above copyright
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* 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
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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#ifndef AudioDelayDSPKernel_h
#define AudioDelayDSPKernel_h
#include "platform/audio/AudioArray.h"
#include "platform/audio/AudioDSPKernel.h"
namespace WebCore {
class PLATFORM_EXPORT AudioDelayDSPKernel : public AudioDSPKernel {
public:
AudioDelayDSPKernel(double maxDelayTime, float sampleRate);
virtual void process(const float* source, float* destination, size_t framesToProcess) OVERRIDE;
virtual void reset() OVERRIDE;
double maxDelayTime() const { return m_maxDelayTime; }
void setDelayFrames(double numberOfFrames) { m_desiredDelayFrames = numberOfFrames; }
virtual double tailTime() const OVERRIDE;
virtual 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 WebCore
#endif // AudioDelayDSPKernel_h