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/*
* sigzero~: detect whether an entire signal vector is 0
*
* (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/>.
*/
/* ------------------------ sigzero~ ----------------------------- */
/*
a very useful function, which detects, whether a signal is zeroes-only this block or not
this is really great together with the "switch~"-object
*/
#include "zexy.h"
static t_class *sigzero_class;
typedef struct _sigzero {
t_object x_obj;
int activate;
int current; /* 0 == (signalblock == 0); 1==(signalblock != 0) */
} t_sigzero;
static void sigzero_activate(t_sigzero *x, t_floatarg activate)
{
x->activate = (activate)?1:0;
}
static void sigzero_banged(t_sigzero *x)
{
x->activate = 1;
}
static void sigzero_off(t_sigzero *x)
{
x->activate = 0;
}
static t_int *sigzero_perform(t_int *w)
{
t_sample *in = (t_sample *)w[1];
t_sigzero *x = (t_sigzero *)w[2];
int n = (int)w[3];
int non_zero = 0;
if (x->activate) {
while (n--) {
if (*in++ != 0.) {
non_zero = 1;
break;
}
}
if (non_zero != x->current) {
outlet_float(x->x_obj.ob_outlet, x->current = non_zero);
}
}
return (w+4);
}
static void sigzero_dsp(t_sigzero *x, t_signal **sp)
{
dsp_add(sigzero_perform, 3, sp[0]->s_vec, x, sp[0]->s_n);
}
static void sigzero_tilde_helper(void)
{
post("\n"HEARTSYMBOL" sigzero~-object :: for detecting whether a signal is currently zero or not");
post("'bang'\t: turn the detector on\n"
"'off'\t: turn it off\n"
"<1/0>\t: turn it on/off\n"
"'help'\t: view this\n"
"signal~");
post("outlet :: 1/0\t: signal turned to non-zero/zero\n");
}
static void *sigzero_new(void)
{
t_sigzero *x = (t_sigzero *)pd_new(sigzero_class);
outlet_new(&x->x_obj, gensym("float"));
return (x);
}
void sigzero_tilde_setup(void)
{
sigzero_class = class_new(gensym("sigzero~"), (t_newmethod)sigzero_new, 0,
sizeof(t_sigzero), 0, 0);
class_addfloat(sigzero_class, sigzero_activate);
class_addbang(sigzero_class, sigzero_banged);
class_addmethod(sigzero_class, (t_method)sigzero_off, gensym("off"), 0);
class_addmethod(sigzero_class, nullfn, gensym("signal"), 0);
class_addmethod(sigzero_class, (t_method)sigzero_dsp, gensym("dsp"), 0);
class_addmethod(sigzero_class, (t_method)sigzero_tilde_helper,
gensym("help"), 0);
zexy_register("sigzero~");
}
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