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/* Copyright (c) 1997- 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 "m_pd.h"
#include "e_fft.h"
/* This file interfaces to one of the Mayer, Ooura, or fftw FFT packages
to implement the "fft~", etc, Pd objects. If using Mayer, also compile
d_fft_mayer.c; if ooura, use d_fft_fftsg.c instead; if fftw, use d_fft_fftw.c
and also link in the fftw library. You can only have one of these three
linked in. The configure script can be used to select which one.
*/
static t_class *sigrifft_class;
typedef struct rifft
{
t_object x_obj;
t_float x_f;
} t_sigrifft;
static void *sigrifft_new(void)
{
t_sigrifft *x = (t_sigrifft *)pd_new(sigrifft_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 t_int *sigrifft_perform(t_int *w)
{
t_sample *in = (t_sample *)(w[1]);
int n = w[2];
mayer_realifft(n, in);
return (w+3);
}
static void sigrifft_dsp(t_sigrifft *x, t_signal **sp)
{
int n = sp[0]->s_n, n2 = (n>>1);
t_sample *in1 = sp[0]->s_vec;
t_sample *in2 = sp[1]->s_vec;
t_sample *out1 = sp[2]->s_vec;
if (n < 4)
{
error("fft: minimum 4 points");
return;
}
if (in2 == out1)
{
dsp_add(sigrfft_flip, 3, out1+1, out1 + n, n2-1);
dsp_add(copy_perform, 3, in1, out1, n2+1);
}
else
{
if (in1 != out1) dsp_add(copy_perform, 3, in1, out1, n2+1);
dsp_add(sigrfft_flip, 3, in2+1, out1 + n, n2-1);
}
dsp_add(sigrifft_perform, 2, out1, n);
}
void rifft_tilde_setup(void)
{
sigrifft_class = class_new(gensym("rifft~"), sigrifft_new, 0,
sizeof(t_sigrifft), 0, 0);
CLASS_MAINSIGNALIN(sigrifft_class, t_sigrifft, x_f);
class_addmethod(sigrifft_class, (t_method)sigrifft_dsp, gensym("dsp"), 0);
class_sethelpsymbol(sigrifft_class, gensym("fft~"));
}
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