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/* Copyright 2002 Benjamin R. Saylor
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "m_pd.h"
static t_class *susloop_class;
static t_float pdsr; /* pd's sample rate */
typedef struct _susloop {
t_object x_obj;
t_float a; /* beginning of loop */
t_float b; /* end of loop */
t_float startpos; /* start offset */
t_float pos; /* position in sample */
t_float direction; /* for pingpong loops */
t_float f; /* dummy for when input is float instead of signal */
void (*susloop_func)(t_int *x, t_float *in, t_float *out, int n); /* can be forward or pingpong */
} t_susloop;
static void susloop_forward(t_int *x, t_float *in, t_float *out, int n)
{
t_float sr;
t_float p = ((t_susloop *)x)->pos;
t_float a = ((t_susloop *)x)->a;
t_float b = ((t_susloop *)x)->b;
while (n--) {
sr = *in;
if (p > b) {
p = a + (p - b);
}
*out = p;
p += sr/pdsr;
in++;
out++;
}
((t_susloop *)x)->pos = p;
}
static void susloop_pingpong(t_int *x, t_float *in, t_float *out, int n)
{
t_float sr;
t_float p = ((t_susloop *)x)->pos;
t_float a = ((t_susloop *)x)->a;
t_float b = ((t_susloop *)x)->b;
t_float d = ((t_susloop *)x)->direction;
while (n--) {
sr = *in;
if (p > b) {
p = b - (p - b);
d = -1;
} else if (p < a && d < 0) {
p = a + (a - p);
d = 1;
}
*out = p;
p += d*(sr/pdsr);
in++;
out++;
}
((t_susloop *)x)->pos = p;
((t_susloop *)x)->direction = d;
}
static t_int *susloop_perform(t_int *w)
{
((t_susloop *)w[1])->susloop_func((t_int *)w[1], (t_float *)(w[2]), (t_float *)(w[3]), (int)(w[4]));
return (w+5);
}
static void susloop_dsp(t_susloop *x, t_signal **sp)
{
dsp_add(susloop_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
static void *susloop_new(t_symbol *s, int argc, t_atom *argv)
{
t_susloop *x = (t_susloop *)pd_new(susloop_class);
int looptype = 0;
x->a = x->b = x->startpos = 0;
x->direction = 1;
x->susloop_func = susloop_forward;
switch (argc) {
case 4:
x->startpos = atom_getfloat(argv+3);
case 3:
looptype = atom_getint(argv+2);
if (looptype == 0)
x->susloop_func = susloop_forward;
else
x->susloop_func = susloop_pingpong;
case 2:
x->a = atom_getfloat(argv);
x->b = atom_getfloat(argv+1);
}
floatinlet_new(&x->x_obj, &x->a);
floatinlet_new(&x->x_obj, &x->b);
floatinlet_new(&x->x_obj, &x->startpos);
outlet_new(&x->x_obj, gensym("signal"));
return (x);
}
static void susloop_bang(t_susloop *x)
{
x->pos = x->startpos;
x->direction = 1;
}
static void susloop_setfunc(t_susloop *x, t_floatarg type)
{
if (type == 1) {
x->direction = 1;
x->susloop_func = susloop_pingpong;
} else
x->susloop_func = susloop_forward;
}
void susloop_tilde_setup(void)
{
pdsr = sys_getsr();
susloop_class = class_new(gensym("susloop~"), (t_newmethod)susloop_new, 0, sizeof(t_susloop), 0, A_GIMME, 0);
class_addbang(susloop_class, susloop_bang);
/*
class_addmethod(susloop_class, nullfn, gensym("signal"), 0);
*/
CLASS_MAINSIGNALIN(susloop_class, t_susloop, f);
class_addmethod(susloop_class, (t_method)susloop_dsp, gensym("dsp"), 0);
class_addmethod(susloop_class, (t_method)susloop_setfunc, gensym("type"), A_DEFFLOAT, 0);
}
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