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/*
* mavg :: moving average filter
*
* (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"
static t_class *mavg_class;
typedef struct _mavg
{
t_object x_obj;
t_float n_inv;
t_float avg;
int size;
t_float *buf, *wp;
} t_mavg;
static void mavg_resize(t_mavg *x, t_float f)
{
int i;
t_float *dumbuf;
f = (int)f;
if ((f<1) || (f == x->size)) return;
freebytes(x->buf, sizeof(t_float)*x->size);
x->n_inv = 1.0/f;
x->size = f;
x->buf = getbytes(sizeof(t_float)*x->size);
dumbuf = x->wp = x->buf;
i = x->size;
while(i--) *dumbuf++ = x->avg;
}
static void mavg_set(t_mavg *x, t_symbol* UNUSED(s), int argc, t_atom *argv)
{
int i = x->size;
t_float *dummy = x->buf;
t_float f=(argc)?atom_getfloat(argv):x->avg;
while (i--) *dummy++=f;
x->wp = x->buf;
}
static void mavg_float(t_mavg *x, t_float f)
{
int i = x->size;
t_float dummy = 0;
t_float *dumb = x->buf;
*x->wp++ = f;
if (x->wp == x->buf + x->size) x->wp = x->buf;
while (i--) dummy += *dumb++;
x->avg = dummy*x->n_inv;
outlet_float(x->x_obj.ob_outlet,x->avg);
}
static void *mavg_new(t_floatarg f)
{
t_mavg *x = (t_mavg *)pd_new(mavg_class);
int i = (f<1)?2:f;
t_float *dumbuf;
outlet_new(&x->x_obj, gensym("float"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym(""));
x->buf = x->wp = (t_float *)getbytes(sizeof(t_float) * i);
x->size = i;
x->n_inv = 1.0f/(t_float)i;
dumbuf = x->buf;
while (i--) *dumbuf++=0;
return (x);
}
static void mavg_help(void)
{
post("mavg\t:: moving average filter");
}
void mavg_setup(void)
{
mavg_class = class_new(gensym("mavg"), (t_newmethod)mavg_new, 0,
sizeof(t_mavg), 0, A_DEFFLOAT, 0);
class_addfloat(mavg_class, (t_method)mavg_float);
class_addmethod(mavg_class, (t_method)mavg_help, gensym("help"), 0);
class_addmethod(mavg_class, (t_method)mavg_set, gensym("set"), A_GIMME, 0);
class_addmethod(mavg_class, (t_method)mavg_resize, gensym(""), A_DEFFLOAT, 0);
zexy_register("mavg");
}
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