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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 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_float *in = (t_float *)(w[2]);
t_float *out = (t_float *)(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%c swap~-object for byteswapping a signal", HEARTSYMBOL);
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);
class_sethelpsymbol(swap_class, gensym("zexy/swap~"));
zexy_register("swap~");
}
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