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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
*
******************************************************/
#include "zexy.h"
/* ------------------------ blockswap~ ----------------------------- */
/* swaps a signalblock around it's center:
{x[0], x[1], ... x[n-1]} --> {x[n-1], x[n-2], ... x[0]}
*/
static t_class *blockswap_class;
typedef struct _blockswap
{
t_object x_obj;
int doit;
int blocksize;
t_float *blockbuffer;
} t_blockswap;
static void blockswap_float(t_blockswap *x, t_floatarg f)
{
x->doit = (f != 0);
}
static t_int *blockswap_perform(t_int *w)
{
t_blockswap *x = (t_blockswap *)(w[1]);
t_float *in = (t_float *)(w[2]);
t_float *out = (t_float *)(w[3]);
int N = (int)(w[4]);
int N2=N/2;
if (x->doit) {
int n=N2;
t_float *dummy=x->blockbuffer;
while(n--)*dummy++=*in++;
n=N-N2;
while(n--)*out++=*in++;
dummy=x->blockbuffer;
n=N2;
while(n--)*out++=*dummy++;
} else while (N--) *out++=*in++;
return (w+5);
}
static void blockswap_dsp(t_blockswap *x, t_signal **sp)
{
if (x->blocksize*2<sp[0]->s_n){
if(x->blockbuffer)freebytes(x->blockbuffer, sizeof(t_float)*x->blocksize);
x->blocksize = sp[0]->s_n/2;
x->blockbuffer = getbytes(sizeof(t_float)*x->blocksize);
}
dsp_add(blockswap_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
static void blockswap_helper(void)
{
post("\n%c blockswap~-object for blockwise-swapping of a signal ", HEARTSYMBOL);
post("'help' : view this\n"
"signal~");
post("outlet : signal~");
}
static void *blockswap_new(void)
{
t_blockswap *x = (t_blockswap *)pd_new(blockswap_class);
outlet_new(&x->x_obj, gensym("signal"));
x->doit = 1;
x->blocksize=0;
return (x);
}
void blockswap_tilde_setup(void)
{
blockswap_class = class_new(gensym("blockswap~"), (t_newmethod)blockswap_new, 0,
sizeof(t_blockswap), 0, A_NULL);
class_addmethod(blockswap_class, nullfn, gensym("signal"), 0);
class_addmethod(blockswap_class, (t_method)blockswap_dsp, gensym("dsp"), 0);
class_addfloat(blockswap_class, blockswap_float);
class_addmethod(blockswap_class, (t_method)blockswap_helper, gensym("help"), 0);
class_sethelpsymbol(blockswap_class, gensym("zexy/blockswap~"));
zexy_register("blockswap~");
}
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