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#include <stdio.h>
#include "zexy.h"
#ifdef NT
#pragma warning( disable : 4244 )
#pragma warning( disable : 4305 )
#endif
/* down~ : down-code for a signal-object */
/* ------------------------ down~ ----------------------------- */
static t_class *down_class;
typedef struct _down
{
t_object x_obj;
t_int old_n;
t_int new_n;
t_int factor;
t_int wantedfactor;
t_float *buffer;
} t_down;
static t_int *down_perform_inplace(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
t_down *x = (t_down *) w[3];
t_int factor = x->factor;
int n = x->new_n;
t_float *buf = x->buffer;
while(n--) {
*buf++=*in;
in+=factor;
}
buf = x->buffer;
n=x->new_n;
while(n--){
*out++=*buf++;
}
return (w+4);
}
static t_int *down_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
t_down *x = (t_down *) w[3];
t_int factor = x->factor;
int n = x->new_n;
while(n--) {
*out++=*in;
in+=factor;
}
return (w+4);
}
static void down_dsp(t_down *x, t_signal **sp)
{
t_float f = sp[0]->s_n/(t_float)x->wantedfactor;
if (f != (int)f) {
int faktor = x->wantedfactor;
while ((f = sp[0]->s_n/(t_float)faktor) != (int)f) faktor--;
error("bad downsampling factor %d, setting to %d", x->wantedfactor, faktor);
x->factor = faktor;
} else x->factor=x->wantedfactor;
freebytes(x->buffer, sizeof(t_float)*x->new_n);
x->old_n=sp[0]->s_n;
x->new_n=sp[0]->s_n/x->factor;
sp[0]->s_n=x->new_n;
x->buffer = getbytes (sizeof(t_float)*x->new_n);
if (sp[0]->s_vec!=sp[1]->s_vec)dsp_add(down_perform, 3, sp[0]->s_vec, sp[1]->s_vec, x);
else dsp_add(down_perform_inplace, 3, sp[0]->s_vec, sp[1]->s_vec, x);
}
static void *down_new(t_floatarg f)
{
t_down *x = (t_down *)pd_new(down_class);
outlet_new(&x->x_obj, gensym("signal"));
x->wantedfactor=f;
if (x->wantedfactor<1)x->wantedfactor=1;
return (x);
}
static void down_setup(void)
{
down_class = class_new(gensym("down~"), (t_newmethod)down_new, 0,
sizeof(t_down), 0, A_DEFFLOAT, 0);
class_addmethod(down_class, nullfn, gensym("signal"), 0);
class_addmethod(down_class, (t_method)down_dsp, gensym("dsp"), 0);
class_sethelpsymbol(down_class, gensym("zexy/down~"));
}
void z_down_setup(void)
{
down_setup();
}
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