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/* Copyright (c) 1997-1999 Miller Puckette and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
#include "fftw~.h"
#ifdef HAVE_LIBFFTW3F
/* Support for fftw3 by Tim Blechmann */
/* ----------------------- rfft~ --------------------------------- */
static t_class *sigrfftw_class;
typedef struct rfftw
{
t_object x_obj;
float x_f;
fftwf_plan plan;
fftwf_iodim dim;
} t_sigrfftw;
static void *sigrfftw_new(void)
{
t_sigrfftw *x = (t_sigrfftw *)pd_new(sigrfftw_class);
outlet_new(&x->x_obj, gensym("signal"));
outlet_new(&x->x_obj, gensym("signal"));
x->x_f = 0;
return (x);
}
static void sigrfftw_free(t_sigrfftw *x)
{
fftwf_destroy_plan(x->plan);
}
static t_int *sigrfftw_perform(t_int *w)
{
fftwf_execute(*(fftwf_plan*)w[1]);
fftw_siginvert((t_sample*)w[2],(t_int)w[3]);
return (w+4);
}
static void sigrfftw_dsp(t_sigrfftw *x, t_signal **sp)
{
int n = sp[0]->s_n, n2 = (n>>1);
float *in = sp[0]->s_vec;
float *out1 = sp[1]->s_vec;
float *out2 = sp[2]->s_vec;
if (n < 4)
{
error("fft: minimum 4 points");
return;
}
else
{
x->dim.n=n;
x->dim.is=1;
x->dim.os=1;
x->plan = fftwf_plan_guru_split_dft_r2c(1, &(x->dim), 0,
NULL,
in, out1, out2,
FFTW_ESTIMATE | FFTW_PRESERVE_INPUT);
dsp_add(sigrfftw_perform,3,&x->plan,out2+1,n2-1);
}
dsp_add_zero(out1 + n2, n2);
dsp_add_zero(out2 + n2, n2);
}
EXTERNAL_SETUP rfftw_tilde_setup(void)
{
sigrfftw_class = class_new(gensym("rfftw~"), sigrfftw_new,
(t_method)sigrfftw_free,
sizeof(t_sigrfftw), 0, 0);
CLASS_MAINSIGNALIN(sigrfftw_class, t_sigrfftw, x_f);
class_addmethod(sigrfftw_class, (t_method)sigrfftw_dsp,
gensym("dsp"), 0);
}
#endif
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