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/*
* blockswap~: swaps a signalblock around it's center
*
* (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/>.
*/
#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_sample *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_sample *in = (t_sample *)(w[2]);
t_sample *out = (t_sample *)(w[3]);
int N = (int)(w[4]);
int N2=N/2;
if (x->doit) {
int n=N2;
t_sample *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(*x->blockbuffer)*x->blocksize);
}
x->blocksize = sp[0]->s_n/2;
x->blockbuffer = getbytes(sizeof(*x->blockbuffer)*x->blocksize);
}
dsp_add(blockswap_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
static void blockswap_helper(t_blockswap *x)
{
post("\n"HEARTSYMBOL" blockswap~-object for blockwise-swapping of a signal ");
post("'help' : view this\n"
"signal~");
post("outlet : signal~");
}
static void blockswap_free(t_blockswap *x)
{
if(x->blockbuffer) {
freebytes(x->blockbuffer, sizeof(*x->blockbuffer)*x->blocksize);
}
x->blockbuffer=0;
}
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, (t_method)blockswap_free,
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);
zexy_register("blockswap~");
}
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