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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 */
/* ----------------------- rifft~ -------------------------------- */
static t_class *sigrifftw_class;
typedef struct rifftw
{
t_object x_obj;
float x_f;
fftwf_plan plan;
fftwf_iodim dim;
} t_sigrifftw;
static void *sigrifftw_new(void)
{
t_sigrifftw *x = (t_sigrifftw *)pd_new(sigrifftw_class);
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
outlet_new(&x->x_obj, gensym("signal"));
x->x_f = 0;
return (x);
}
static void sigrifftw_free(t_sigrifftw *x)
{
fftwf_destroy_plan(x->plan);
}
static t_int *sigrifftw_perform(t_int *w)
{
fftw_siginvert((t_sample *)w[2],w[3]);
fftwf_execute(*(fftwf_plan*)w[1]);
return (w+4);
}
static void sigrifftw_dsp(t_sigrifftw *x, t_signal **sp)
{
int n = sp[0]->s_n, n2 = (n>>1);
float *in1 = sp[0]->s_vec;
float *in2 = sp[1]->s_vec;
float *out = 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_c2r(1, &(x->dim), 0,
NULL,
in1, in2, out,
FFTW_ESTIMATE | FFTW_PRESERVE_INPUT);
dsp_add_zero(in1+ n/2, n/2);
dsp_add(sigrifftw_perform,3,&x->plan,in2,n2);
}
}
EXTERNAL_SETUP rifftw_tilde_setup(void)
{
sigrifftw_class = class_new(gensym("rifftw~"), sigrifftw_new,
(t_method)sigrifftw_free,
sizeof(t_sigrifftw), 0, 0);
CLASS_MAINSIGNALIN(sigrifftw_class, t_sigrifftw, x_f);
class_addmethod(sigrifftw_class, (t_method)sigrifftw_dsp,
gensym("dsp"), 0);
}
#endif
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