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/*
* avg~: calculate the average of a signal block
*
* (c) 1999-2011 IOhannes m zmölnig, forum::für::umläute, institute of electronic music and acoustics (iem)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "zexy.h"
/* ------------------------ average~ ----------------------------- */
/* tilde object to take absolute value. */
static t_class *avg_class;
typedef struct _avg
{
t_object x_obj;
t_float n_inv;
int blocks;
} t_avg;
/* average :: arithmetic mean of one signal-vector */
static t_int *avg_perform(t_int *w)
{
t_sample *in = (t_sample *)(w[1]);
t_avg *x = (t_avg *)w[2];
int n = (int)(w[3]);
t_sample 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);
zexy_register("avg~");
}
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