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/*
* tavg~: arithmetic mean between last and current 'bang' (triggered average on signals)
*
* (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 *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, gensym("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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