/*
  ZynAddSubFX - a software synthesizer

  FFTwrapper.h  -  A wrapper for Fast Fourier Transforms
  Copyright (C) 2002-2005 Nasca Octavian Paul
  Author: Nasca Octavian Paul

  This program is free software; you can redistribute it and/or modify
  it under the terms of version 2 of the GNU General Public License
  as published by the Free Software Foundation.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License (version 2 or later) for more details.

  You should have received a copy of the GNU General Public License (version 2)
  along with this program; if not, write to the Free Software Foundation,
  Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA

*/

#ifndef FFT_WRAPPER_H
#define FFT_WRAPPER_H

#include "../globals.h"

#ifdef FFTW_VERSION_2

#include <fftw.h>

/* If you got error messages about rfftw.h, replace the next include  line with "#include <srfftw.h>"
or with "#include <drfftw.h> (if one doesn't work try the other). It may be necessary to replace
the <fftw.h> with <dfftw.h> or <sfftw.h>. If the neither one doesn't work,
please install latest version of fftw(recomanded from the sources) from www.fftw.org.
If you'll install fftw3 you need to change the Makefile.inc
Hope all goes right." */
#include <rfftw.h>

#else

#include <fftw3.h>
#define fftw_real float
#define rfftw_plan fftwf_plan
#endif

/**A wrapper for the FFTW library (Fast Fourier Transforms)*/
class FFTwrapper
{
    public:
        /**Constructor
         * @param fftsize The size of samples to be fed to fftw*/
        FFTwrapper(int fftsize_);
        /**Destructor*/
        ~FFTwrapper();
        /**Convert Samples to Frequencies using Fourier Transform
         * @param smps Pointer to Samples to be converted; has length fftsize_
         * @param freqs Structure FFTFREQS which stores the frequencies*/
        void smps2freqs(REALTYPE *smps, FFTFREQS freqs);
        void freqs2smps(FFTFREQS freqs, REALTYPE *smps);
    private:
        int fftsize;
        fftw_real *tmpfftdata1, *tmpfftdata2;
        rfftw_plan planfftw, planfftw_inv;
};

void newFFTFREQS(FFTFREQS *f, int size);
void deleteFFTFREQS(FFTFREQS *f);
#endif