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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
*
******************************************************/
#include "zexy.h"
#include <math.h>
/* ------------------------ average~ ----------------------------- */
/* tilde object to take absolute value. */
static t_class *avg_class;
typedef struct _avg
{
t_object x_obj;
t_float n_inv;
t_float buf;
int blocks;
} t_avg;
/* average :: arithmetic mean of one signal-vector */
static t_int *avg_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_avg *x = (t_avg *)w[2];
int n = (int)(w[3]);
t_float buf = 0.;
while (n--)
{
buf += *in++;
}
outlet_float(x->x_obj.ob_outlet, buf*x->n_inv);
return (w+4);
}
static void avg_dsp(t_avg *x, t_signal **sp)
{
x->n_inv=1./sp[0]->s_n;
dsp_add(avg_perform, 3, sp[0]->s_vec, x, sp[0]->s_n);
}
static void *avg_new(void)
{
t_avg *x = (t_avg *)pd_new(avg_class);
outlet_new(&x->x_obj, gensym("float"));
return (x);
}
static void avg_help(void)
{
post("avg~\t:: outputs the arithmetic mean of each signal-vector");
}
void avg_tilde_setup(void)
{
avg_class = class_new(gensym("avg~"), (t_newmethod)avg_new, 0,
sizeof(t_avg), 0, A_DEFFLOAT, 0);
class_addmethod(avg_class, nullfn, gensym("signal"), 0);
class_addmethod(avg_class, (t_method)avg_dsp, gensym("dsp"), 0);
class_addmethod(avg_class, (t_method)avg_help, gensym("help"), 0);
class_sethelpsymbol(avg_class, gensym("zexy/avg~"));
zexy_register("avg~");
}
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