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/******************************************************
*
* zexy - implementation file
*
* copyleft (c) IOhannes m zmölnig
*
* 1999:forum::für::umläute:2004
*
* institute of electronic music and acoustics (iem)
*
******************************************************
*
* license: GNU General Public License v.2
*
******************************************************/
/*
here we do some sample-wise delay, so you can do your own FIR-filter-designs
here are :: "z^(-1)", "z^(-N)"
to do :: a "lattice~" section ...
1302:forum::für::umläute:2000
*/
#include "zexy.h"
/* ----------------------------------------------------- */
static t_class *zNdelay_class;
typedef struct _zNdelay
{
t_object x_obj;
t_float *buf;
int bufsize, phase;
} t_zNdelay;
static void zdel_float(t_zNdelay *x, t_floatarg f)
{
int i = f+1;
if (i<1)i=1;
if (i==x->bufsize)return;
freebytes(x->buf, x->bufsize*sizeof(t_float));
x->bufsize=i;
x->buf=(t_float *)getbytes(x->bufsize*sizeof(t_float));
x->phase=0;
}
static t_int *zN_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
t_zNdelay *x = (t_zNdelay *)(w[3]);
int n = (int)(w[4]);
t_float *buf = x->buf;
int bufsize=x->bufsize, ph=x->phase;
if (bufsize==1) {
if (in!=out)while(n--)*out++=*in++;
} else if (bufsize==2) {
register t_float f, last=*buf;
while(n--){
f=*in++;
*out++=last;
last=f;
}
*buf=last;
} else {
while (n--) {
*(buf+ph++) = *in++;
*out++ = buf[ph%=bufsize];
}
x->phase=ph;
}
return (w+5);
}
static void zNdelay_dsp(t_zNdelay *x, t_signal **sp)
{
dsp_add(zN_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n);
}
static void *zNdelay_new(t_floatarg f)
{
t_zNdelay *x = (t_zNdelay *)pd_new(zNdelay_class);
int i = f;
t_float *b;
if (i<=0) i=1;
i++;
x->bufsize = i;
x->buf = (t_float *)getbytes(sizeof(t_float) * x->bufsize);
b=x->buf;
while (i--) {
*b++=0;
}
x->phase = 0;
outlet_new(&x->x_obj, gensym("signal"));
return (x);
}
static void zNdelay_free(t_zNdelay *x)
{
freebytes(x->buf, sizeof(t_float) * x->bufsize);
}
static void zdel_helper(void)
{
post("\n%c z~\t:: samplewise delay", HEARTSYMBOL);
post("creation :: 'z~ [<n>]' : creates a <n>-sample delay; default is 1");
}
void z_tilde_setup(void)
{
zNdelay_class = class_new(gensym("z~"), (t_newmethod)zNdelay_new, (t_method)zNdelay_free,
sizeof(t_zNdelay), 0, A_DEFFLOAT, 0);
class_addmethod(zNdelay_class, nullfn, gensym("signal"), 0);
class_addmethod(zNdelay_class, (t_method)zNdelay_dsp, gensym("dsp"), 0);
class_addfloat(zNdelay_class, zdel_float);
class_addmethod(zNdelay_class, (t_method)zdel_helper, gensym("help"), 0);
class_sethelpsymbol(zNdelay_class, gensym("zexy/z~"));
zexy_register("z~");
}
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