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/******************************************************
*
* zexy - implementation file
*
* copyleft (c) IOhannes m zmölnig
*
* 1999:forum::für::umläute:2004
*
* institute of electronic music and acoustics (iem)
*
******************************************************
*
* license: GNU General Public License v.2
*
******************************************************/
#include <stdio.h>
#include "zexy.h"
/* ------------------------ dspobj~ ----------------------------- */
/* datendefinition */
static t_class *dfreq_class;
typedef struct _dfreq
{
t_object x_obj;
t_float freq; /*freqenz variable */
t_float alt;
float sampcount;
t_float sr;
} t_dfreq;
static t_int *dfreq_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
int n = (int)(w[3]);
t_dfreq *x = (t_dfreq *) w[4];
t_float a = x->alt, c = x->sampcount;
t_float freq = x->freq, sr=x->sr;
t_float 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_float) 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 helper(void)
{
post("\n%c dfreq~\t :: pitch-detector that counts zero-crossings", HEARTSYMBOL);
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)helper, gensym("help"), 0);
class_sethelpsymbol(dfreq_class, gensym("zexy/dfreq~"));
zexy_register("dfreq~");
}
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