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/*
* dfreq~: cound zero-crossings as a simple fequency estimation
*
* (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 <stdio.h>
#include "zexy.h"
/* ------------------------ dspobj~ ----------------------------- */
/* datendefinition */
static t_class *dfreq_class;
typedef struct _dfreq
{
t_object x_obj;
t_sample freq; /*frequenz variable */
t_sample alt;
t_sample sampcount;
t_sample sr;
} t_dfreq;
static t_int *dfreq_perform(t_int *w)
{
t_sample *in = (t_sample *)(w[1]);
t_sample *out = (t_sample *)(w[2]);
int n = (int)(w[3]);
t_dfreq *x = (t_dfreq *) w[4];
t_sample a = x->alt;
t_sample c = x->sampcount;
t_sample freq = x->freq;
t_sample sr=x->sr;
t_sample delta_inv;
while (n--) {
if( (a * *in) < 0 && (a < *in)){
/* interpolate for real zerocross */
delta_inv = 1./(*in-a);
if(c > 0.0)
freq = sr / ((t_sample) c + a*delta_inv);
else
freq = sr;
c = *in*delta_inv; /*rest of time */
};
a = *in;
in++;
c += 1.0;
*out++ = freq;
}
x->alt = a;
x->sampcount = c;
x->freq=freq;
return (w+5);
}
static void dfreq_dsp(t_dfreq *x, t_signal **sp)
{
dsp_add(dfreq_perform, 4, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n,x);
}
static void *dfreq_new(void)
{
t_dfreq *x = (t_dfreq *)pd_new(dfreq_class);
outlet_new(&x->x_obj, gensym("signal"));
x->sr = sys_getsr();
return (x);
}
static void dfreq_tilde_helper(void)
{
post("\n"HEARTSYMBOL" dfreq~\t :: pitch-detector that counts zero-crossings");
post("\noutputs a frequency estimate as a stream~ that will be updated every zero-X");
post("\ncreation::\t'dfreq~': that's all");
}
void dfreq_tilde_setup(void)
{
dfreq_class = class_new(gensym("dfreq~"), (t_newmethod)dfreq_new, 0,
sizeof(t_dfreq), 0, A_NULL);
class_addmethod(dfreq_class, nullfn, gensym("signal"), 0);
class_addmethod(dfreq_class, (t_method)dfreq_dsp, gensym("dsp"), 0);
class_addmethod(dfreq_class, (t_method)dfreq_tilde_helper, gensym("help"), 0);
zexy_register("dfreq~");
}
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