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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"
/* triggered average :: arithmetic mean between last and current BANG */
static t_class *tavg_class;
typedef struct _tavg
{
t_object x_obj;
t_sample n_inv;
t_sample buf;
unsigned int blocks;
} t_tavgtilde;
static void tavg_bang(t_tavgtilde *x)
{
if (x->blocks) {
t_float result=x->buf*x->n_inv/x->blocks;
outlet_float(x->x_obj.ob_outlet, result);
x->blocks = 0;
x->buf = 0.;
}
}
static t_int *tavg_perform(t_int *w)
{
t_sample *in = (t_sample *)(w[1]);
t_tavgtilde *x = (t_tavgtilde *)w[2];
int n = (int)(w[3]);
t_sample buf = x->buf;
while (n--) buf += *in++;
x->buf = buf;
x->blocks++;
return (w+4);
}
static void tavg_dsp(t_tavgtilde *x, t_signal **sp)
{
x->n_inv=1./sp[0]->s_n;
dsp_add(tavg_perform, 3, sp[0]->s_vec, x, sp[0]->s_n);
}
static void *tavg_new(void)
{
t_tavgtilde *x = (t_tavgtilde *)pd_new(tavg_class);
outlet_new(&x->x_obj, &s_float);
return (x);
}
static void tavg_help(void)
{
post("tavg~\t\t:: outputs the arithmetic mean of a signal when triggered");
post("<bang>\t\t: triggers the output");
}
void tavg_tilde_setup(void)
{
tavg_class = class_new(gensym("tavg~"), (t_newmethod)tavg_new, 0,
sizeof(t_tavgtilde), 0, A_DEFFLOAT, 0);
class_addmethod(tavg_class, nullfn, gensym("signal"), 0);
class_addmethod(tavg_class, (t_method)tavg_dsp, gensym("dsp"), 0);
class_addbang(tavg_class, tavg_bang);
class_addmethod(tavg_class, (t_method)tavg_help, gensym("help"), 0);
zexy_register("tavg~");
}
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