root/WaveShaperProcessor.h

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 * Copyright (C) 2011, Google Inc. All rights reserved.
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#ifndef WaveShaperProcessor_h
#define WaveShaperProcessor_h

#include "core/platform/audio/AudioDSPKernel.h"
#include "core/platform/audio/AudioDSPKernelProcessor.h"
#include "modules/webaudio/AudioNode.h"
#include "wtf/Float32Array.h"
#include "wtf/RefPtr.h"
#include "wtf/Threading.h"

namespace WebCore {

// WaveShaperProcessor is an AudioDSPKernelProcessor which uses WaveShaperDSPKernel objects to implement non-linear distortion effects.

class WaveShaperProcessor : public AudioDSPKernelProcessor {
public:
    enum OverSampleType {
        OverSampleNone,
        OverSample2x,
        OverSample4x
    };

    WaveShaperProcessor(float sampleRate, size_t numberOfChannels);

    virtual ~WaveShaperProcessor();

    virtual PassOwnPtr<AudioDSPKernel> createKernel();

    virtual void process(const AudioBus* source, AudioBus* destination, size_t framesToProcess);

    void setCurve(Float32Array*);
    Float32Array* curve() { return m_curve.get(); }

    void setOversample(OverSampleType);
    OverSampleType oversample() const { return m_oversample; }

private:
    // m_curve represents the non-linear shaping curve.
    RefPtr<Float32Array> m_curve;

    OverSampleType m_oversample;

    // This synchronizes process() with setCurve().
    mutable Mutex m_processLock;
};

} // namespace WebCore

#endif // WaveShaperProcessor_h

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