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/*
* swap~: byteswap a 16bit signal
*
* (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 swap~-object that does a byte swap
of course, we unfortunately have to quantize the float-signal to 16bit (to get bytes)
1110:forum::für::umläute:1999
*/
#include "zexy.h"
/* ------------------------ swap~ ----------------------------- */
#define FLOAT2SHORT 32768.
#define SHORT2FLOAT 1./32768.
static t_class *swap_class;
typedef struct _swap {
t_object x_obj;
int swapper;
} t_swap;
static void swap_float(t_swap *x, t_floatarg f)
{
x->swapper = (f != 0);
}
static void swap_bang(t_swap *x)
{
x->swapper ^= 1;
}
static t_int *swap_perform(t_int *w)
{
t_swap *x = (t_swap *)(w[1]);
t_sample *in = (t_sample *)(w[2]);
t_sample *out = (t_sample *)(w[3]);
int n = (int)(w[4]);
if (x->swapper)
while (n--) {
short dummy = FLOAT2SHORT **in++;
*out++ = SHORT2FLOAT * (short)( ((dummy & 0xFF) << 8) | ((
dummy & 0xFF00) >> 8) );
}
else while (n--) {
*out++ = *in++;
}
return (w+5);
}
static void swap_dsp(t_swap *x, t_signal **sp)
{
dsp_add(swap_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
static void swap_helper(void)
{
post("\n"HEARTSYMBOL" swap~-object for byteswapping a signal");
post("<1/0> : turn the swapper on/off\n"
"'bang' : toggle the swapper on/off\n"
"'help' : view this\n"
"signal~");
post("outlet : signal~");
}
static void *swap_new(void)
{
t_swap *x = (t_swap *)pd_new(swap_class);
outlet_new(&x->x_obj, gensym("signal"));
x->swapper = 1;
return (x);
}
void swap_tilde_setup(void)
{
swap_class = class_new(gensym("swap~"), (t_newmethod)swap_new, 0,
sizeof(t_swap), 0, A_NULL);
class_addmethod(swap_class, nullfn, gensym("signal"), 0);
class_addmethod(swap_class, (t_method)swap_dsp, gensym("dsp"), 0);
class_addfloat(swap_class, swap_float);
class_addbang(swap_class, swap_bang);
class_addmethod(swap_class, (t_method)swap_helper, gensym("help"), 0);
zexy_register("swap~");
}
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