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/*
ZynAddSubFX - a software synthesizer
FFTwrapper.c - 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) 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
*/
#include <math.h>
#include "FFTwrapper.h"
FFTwrapper::FFTwrapper(int fftsize_){
fftsize=fftsize_;
tmpfftdata1=new fftw_real[fftsize];
tmpfftdata2=new fftw_real[fftsize];
#ifdef FFTW_VERSION_2
planfftw=rfftw_create_plan(fftsize,FFTW_REAL_TO_COMPLEX,FFTW_ESTIMATE|FFTW_IN_PLACE);
planfftw_inv=rfftw_create_plan(fftsize,FFTW_COMPLEX_TO_REAL,FFTW_ESTIMATE|FFTW_IN_PLACE);
#else
planfftw=fftw_plan_r2r_1d(fftsize,tmpfftdata1,tmpfftdata1,FFTW_R2HC,FFTW_ESTIMATE);
planfftw_inv=fftw_plan_r2r_1d(fftsize,tmpfftdata2,tmpfftdata2,FFTW_HC2R,FFTW_ESTIMATE);
#endif
};
FFTwrapper::~FFTwrapper(){
#ifdef FFTW_VERSION_2
rfftw_destroy_plan(planfftw);
rfftw_destroy_plan(planfftw_inv);
#else
fftw_destroy_plan(planfftw);
fftw_destroy_plan(planfftw_inv);
#endif
delete [] tmpfftdata1;
delete [] tmpfftdata2;
};
/*
* do the Fast Fourier Transform
*/
void FFTwrapper::smps2freqs(REALTYPE *smps,FFTFREQS freqs){
#ifdef FFTW_VERSION_2
for (int i=0;i<fftsize;i++) tmpfftdata1[i]=smps[i];
rfftw_one(planfftw,tmpfftdata1,tmpfftdata2);
for (int i=0;i<fftsize/2;i++) {
freqs.c[i]=tmpfftdata2[i];
if (i!=0) freqs.s[i]=tmpfftdata2[fftsize-i];
};
#else
for (int i=0;i<fftsize;i++) tmpfftdata1[i]=smps[i];
fftw_execute(planfftw);
for (int i=0;i<fftsize/2;i++) {
freqs.c[i]=tmpfftdata1[i];
if (i!=0) freqs.s[i]=tmpfftdata1[fftsize-i];
};
#endif
tmpfftdata2[fftsize/2]=0.0;
};
/*
* do the Inverse Fast Fourier Transform
*/
void FFTwrapper::freqs2smps(FFTFREQS freqs,REALTYPE *smps){
tmpfftdata2[fftsize/2]=0.0;
#ifdef FFTW_VERSION_2
for (int i=0;i<fftsize/2;i++) {
tmpfftdata1[i]=freqs.c[i];
if (i!=0) tmpfftdata1[fftsize-i]=freqs.s[i];
};
rfftw_one(planfftw_inv,tmpfftdata1,tmpfftdata2);
for (int i=0;i<fftsize;i++) smps[i]=tmpfftdata2[i];
#else
for (int i=0;i<fftsize/2;i++) {
tmpfftdata2[i]=freqs.c[i];
if (i!=0) tmpfftdata2[fftsize-i]=freqs.s[i];
};
fftw_execute(planfftw_inv);
for (int i=0;i<fftsize;i++) smps[i]=tmpfftdata2[i];
#endif
};
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