DelayDSPKernel.h revision cad810f21b803229eb11403f9209855525a25d57 
1/*
2 * Copyright (C) 2010, Google Inc. All rights reserved.
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4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
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23 */
24
25#ifndef DelayDSPKernel_h
26#define DelayDSPKernel_h
27
28#include "AudioArray.h"
29#include "AudioDSPKernel.h"
30#include "DelayProcessor.h"
31
32namespace WebCore {
33
34class DelayProcessor;
35
36class DelayDSPKernel : public AudioDSPKernel {
37public:
38    DelayDSPKernel(DelayProcessor*);
39    DelayDSPKernel(double maxDelayTime, double sampleRate);
40
41    virtual void process(const float* source, float* destination, size_t framesToProcess);
42    virtual void reset();
43
44    double maxDelayTime() const { return m_maxDelayTime; }
45
46    void setDelayFrames(double numberOfFrames) { m_desiredDelayFrames = numberOfFrames; }
47
48private:
49    AudioFloatArray m_buffer;
50    double m_maxDelayTime;
51    int m_writeIndex;
52    double m_currentDelayTime;
53    double m_smoothingRate;
54    bool m_firstTime;
55    double m_desiredDelayFrames;
56
57    DelayProcessor* delayProcessor() { return static_cast<DelayProcessor*>(processor()); }
58};
59
60} // namespace WebCore
61
62#endif // DelayDSPKernel_h
63