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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
*
******************************************************/
/*
1110:forum::für::umläute:1999
*/
#include "zexy.h"
/* ------------------------ blockshuffle~ ----------------------------- */
/* mirrors a signalblock around it's center:
{x[0], x[1], ... x[n-1]} --> {x[n-1], x[n-2], ... x[0]}
*/
static t_class *blockshuffle_class;
typedef struct _blockshuffle
{
t_object x_obj;
t_sample*blockbuf;
t_int* indices;
int size;
t_float *shuffle;
int shufflesize;
} t_blockshuffle;
static void blockshuffle_buildindex(t_blockshuffle *x, int blocksize){
int i=0;
if(blocksize!=x->size){
if(x->indices)freebytes(x->indices, x->size);
if(x->blockbuf)freebytes(x->blockbuf, x->size);
x->indices=getbytes (sizeof(t_int)*blocksize);
x->blockbuf=getbytes(sizeof(t_sample)*blocksize);
x->size=blocksize;
}
for(i=0;i<x->shufflesize&&i<blocksize; i++){
int idx=x->shuffle[i];
if(idx>=blocksize)idx=blocksize-1;
if(idx<0)idx=0;
x->indices[i]=idx;
}
for(;i<blocksize; i++){
x->indices[i]=i;
}
}
static void blockshuffle_list(t_blockshuffle *x, t_symbol*s, int argc, t_atom*argv)
{
int i;
if(x->shuffle){
freebytes(x->shuffle, x->shufflesize);
x->shuffle=0;
}
x->shufflesize=argc;
x->shuffle=getbytes(sizeof(t_float)*argc);
for(i=0; i<argc; i++){
x->shuffle[i]=atom_getfloat(argv++);
}
blockshuffle_buildindex(x, x->size);
}
static t_int *blockshuffle_perform(t_int *w)
{
t_blockshuffle*x = (t_blockshuffle *)(w[1]);
t_sample *in = (t_sample *)(w[2]);
t_sample *out = (t_sample *)(w[3]);
int n = (int)(w[4]);
int i=0;
t_sample *temp=x->blockbuf;
t_int *idx =x->indices;
if(idx){
for(i=0; i<n; i++){
temp[i]=in[idx[i]];
}
temp=x->blockbuf;
for(i=0; i<n; i++){
*out++=*temp++;
}
} else
while(n--)*out++=*in++;
return (w+5);
}
static void blockshuffle_dsp(t_blockshuffle *x, t_signal **sp)
{
blockshuffle_buildindex(x, sp[0]->s_n);
dsp_add(blockshuffle_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
static void blockshuffle_helper(void)
{
post("\n%c blockshuffle~-object for shuffling the samples within a signal-block", HEARTSYMBOL);
post("'help' : view this\n"
"signal~");
post("outlet : signal~");
}
static void blockshuffle_free(t_blockshuffle *x){
if(x->indices)freebytes(x->indices, x->size);
if(x->blockbuf)freebytes(x->blockbuf, x->size);
if(x->shuffle)freebytes(x->shuffle, x->shufflesize);
}
static void *blockshuffle_new(void)
{
t_blockshuffle *x = (t_blockshuffle *)pd_new(blockshuffle_class);
outlet_new(&x->x_obj, gensym("signal"));
x->size=0;
x->blockbuf=0;
x->indices=0;
x->shuffle=0;
x->shufflesize=0;
return (x);
}
void blockshuffle_tilde_setup(void)
{
blockshuffle_class = class_new(gensym("blockshuffle~"), (t_newmethod)blockshuffle_new,
(t_method)blockshuffle_free,
sizeof(t_blockshuffle), 0, A_NULL);
class_addmethod(blockshuffle_class, nullfn, gensym("signal"), 0);
class_addmethod(blockshuffle_class, (t_method)blockshuffle_dsp, gensym("dsp"), 0);
class_addlist(blockshuffle_class, blockshuffle_list);
class_addmethod(blockshuffle_class, (t_method)blockshuffle_helper, gensym("help"), 0);
class_sethelpsymbol(blockshuffle_class, gensym("zexy/blockshuffle~"));
zexy_register("blockshuffle~");
}
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