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/*
* permut.c - applies a (random) permutation on a signal block
* intended for spectral processing, dynwav
*
* Copyright (c) 2000-2003 by Tom Schouten
*
* 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, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <math.h>
#include <stdlib.h>
//#include "m_pd.h"
#include "extlib_util.h"
typedef union
{
float f;
unsigned int i;
}t_permutflint;
typedef struct permutctl
{
char c_type;
int *c_permutationtable;
int c_blocksize;
} t_permutctl;
typedef struct permut
{
t_object x_obj;
t_float x_f;
t_permutctl x_ctl;
} t_permut;
static inline void permut_perform_permutation(t_float *S, int n, int *f)
{
int k,l;
t_float swap;
for(k=0; k<n; k++)
{
l = f[k];
while (l<k) l = f[l];
swap = S[k];
S[k] = S[l];
S[l] = swap;
}
}
static void permut_random(t_permut *x, t_floatarg seed)
{
int i,j;
int N = x->x_ctl.c_blocksize;
int mask = N-1;
int *p = x->x_ctl.c_permutationtable;
int r, last = 0;
t_permutflint flintseed;
flintseed.f = (float)seed;
srand(flintseed.i);
if(p)
{
p[0] = rand() & mask;
for (i=1;i<N;i++)
{
r = rand() & mask;
j = 0;
while(j<i)
{
if (p[j] == r)
{
r = (r + 1) & mask;
j = 0;
}
else j++;
}
p[i] = r;
}
}
}
static void permut_bang(t_permut *x)
{
t_permutflint seed;
seed.i = rand();
t_float floatseed = (t_float)seed.f;
permut_random(x, floatseed);
}
static void permut_resize_table(t_permut *x, int size)
{
if (x->x_ctl.c_blocksize != size)
{
if (x->x_ctl.c_permutationtable)
free(x->x_ctl.c_permutationtable);
x->x_ctl.c_permutationtable = (int *)malloc(sizeof(int)*size);
x->x_ctl.c_blocksize = size;
/* make sure it's initialized */
permut_bang(x);
}
}
static t_int *permut_perform(t_int *w)
{
t_float *in = (t_float *)(w[3]);
t_float *out = (t_float *)(w[4]);
t_permutctl *ctl = (t_permutctl *)(w[1]);
int i;
int n = (int)(w[2]);
t_float x,y;
int *p = ctl->c_permutationtable;
if (in != out)
for (i=0; i<n; i++) out[i] = in[i];
permut_perform_permutation(out, n, p);
return (w+5);
}
static void permut_dsp(t_permut *x, t_signal **sp)
{
permut_resize_table(x, sp[0]->s_n);
dsp_add(permut_perform, 4, &x->x_ctl, sp[0]->s_n, sp[0]->s_vec, sp[1]->s_vec);
}
static void permut_free(t_permut *x)
{
if (x->x_ctl.c_permutationtable) free(x->x_ctl.c_permutationtable);
}
t_class *permut_class;
static void *permut_new(void)
{
t_permut *x = (t_permut *)pd_new(permut_class);
outlet_new(&x->x_obj, gensym("signal"));
x->x_ctl.c_permutationtable = 0;
x->x_ctl.c_blocksize = 0;
permut_resize_table(x, 64);
permut_random(x, 0);
return (void *)x;
}
void permut_tilde_setup(void)
{
//post("permut~ v0.1");
permut_class = class_new(gensym("permut~"), (t_newmethod)permut_new,
(t_method)permut_free, sizeof(t_permut), 0, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(permut_class, t_permut, x_f);
class_addmethod(permut_class, (t_method)permut_random, gensym("random"), A_FLOAT, 0);
class_addmethod(permut_class, (t_method)permut_bang, gensym("bang"), 0);
class_addmethod(permut_class, (t_method)permut_dsp, gensym("dsp"), 0);
}
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