CL_Filter.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * NAME:        CL_Filter.h ( Clip Library, C++)
 *
 * COMMENTS:
 *      Does continuous digital filtering
 *
 */


#ifndef __CL_Filter__
#define __CL_Filter__

#include "CL_API.h"
#include "CL_SlidingWindow.h"
#include <UT/UT_FFT.h>
#include <SYS/SYS_Types.h>

class UT_IStream;

class CL_API CL_Filter final : public CL_SlidingWindow
{
public:

                 CL_Filter(int size, int overlap);
                 CL_Filter(UT_IStream &is);
                ~CL_Filter() override;

    // must be 'size' floats long.
    void         setFilter(fpreal *filter, fpreal *phase = nullptr);
    
    void         reset(fpreal val = 0.0) override;
    int          maxFilterSamples() override;

private:
    void         doWindowOp(int nsamples, fpreal *dest) override;

    // Should only be called from the constructor
    void        initialize();

    void        window(fpreal *windower);
    void        filter();
    void        computeWindow();

    fpreal       myLastDataSample;
    fpreal       myLastSlope;
    
    fpreal      *myData;
    fpreal      *myReal, * myImag;
    fpreal      *myFilter;
    fpreal      *myPhaseFilter;

    fpreal      *myWindow;
    fpreal      *myUnWindow;

    UT_FFT<fpreal> *myTransform;
    
};

#endif