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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
*
******************************************************/
/*
the long waited for quantize~-object that quantizes in many possible (but equal) steps
of course, we´ll make a comfortable quantize of the float-signal for 16bit and 8bit
1110:forum::für::umläute:1999
*/
#include "zexy.h"
/* ------------------------ quantize~ ----------------------------- */
static t_class *quantize_class;
typedef struct _quantize
{
t_object x_obj;
t_sample quantiz, dequantiz;
} t_quantize;
static void quantize_float(t_quantize *x, t_floatarg f)
{
x->quantiz = f;
x->dequantiz = 1./f;
}
static void quantize_16bit(t_quantize *x)
{
x->quantiz = 32768.;
x->dequantiz = 1./32768.;
}
static void quantize_8bit(t_quantize *x)
{
x->quantiz = 128.;
x->dequantiz = 1./128.;
}
static t_int *quantize_perform(t_int *w)
{
t_quantize *x = (t_quantize *)(w[1]);
t_sample *in = (t_sample *)(w[2]);
t_sample *out = (t_sample *)(w[3]);
int n = (int)(w[4]);
t_sample quantiz = x->quantiz, dequantiz = x->dequantiz;
if (quantiz)
while (n--) *out++ = dequantiz*(int)(quantiz**in++);
else while (n--) *out++ = *in++;
return (w+5);
}
static void quantize_dsp(t_quantize *x, t_signal **sp)
{
dsp_add(quantize_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
static void quantize_tilde_helper(t_quantize *x)
{
ZEXY_USEVAR(x);
post("%c quantize~-object\t:: used for quantizing signals by various degrees", HEARTSYMBOL);
post("<quants> : quantize a signal into <quants> steps ('0' turns quantizing off)\n"
"'8bit' : quantize to 8 bit\n"
"'16bit' : quantize to 16 bit (default)\n"
"'float' : pass-through the signal unchanged\n"
"'help' : view this\n"
"signal~\n");
post("creation:: \"quantize~ [<quants>]\"");
}
static void *quantize_new(t_floatarg f)
{
t_quantize *x = (t_quantize *)pd_new(quantize_class);
outlet_new(&x->x_obj, gensym("signal"));
if (f) quantize_float(x, f);
else quantize_16bit(x);
return (x);
}
void quantize_tilde_setup(void)
{
quantize_class = class_new(gensym("quantize~"), (t_newmethod)quantize_new, 0,
sizeof(t_quantize), 0, A_DEFFLOAT, 0);
class_addmethod(quantize_class, nullfn, gensym("signal"), 0);
class_addmethod(quantize_class, (t_method)quantize_dsp, gensym("dsp"), 0);
class_addfloat(quantize_class, quantize_float);
class_addmethod(quantize_class, (t_method)quantize_8bit, gensym("8bit"), 0);
class_addmethod(quantize_class, (t_method)quantize_16bit, gensym("16bit"), 0);
class_addmethod(quantize_class, (t_method)quantize_tilde_helper, gensym("help"), 0);
zexy_register("quantize~");
}
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