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/*
* quantize~: quantize a signal to various bit-depths
*
* (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/>.
*/
/*
the long waited for quantize~-object that quantizes in many possible (but equal) steps
of course, weŽll 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* UNUSED(x))
{
post(""HEARTSYMBOL" quantize~-object\t:: used for quantizing signals by various degrees");
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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