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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"
#ifdef NT
#pragma warning( disable : 4244 )
#pragma warning( disable : 4305 )
#endif
enum { ATTACK, DECAY, RELEASE, LINEAR, LOGARITHMIC };
#define THRESHOLD 0.99
#define SCALE 4600.0
#define CLIP(x) ((x < 0.1) ? 0.1 : x)
#define IS_DENORMAL(f) (((*(unsigned int *)&(f))&0x7f800000) == 0)
static t_class *aenv_class;
typedef struct _aenv {
t_object x_obj;
t_float srate;
t_float a;
t_float d;
t_float s;
t_float r;
t_float lastval;
int stage;
int attacktype;
} t_aenv;
static t_int *aenv_perform(t_int *w)
{
t_aenv *x = (t_aenv *)(w[1]);
t_float *out = (t_float *)(w[2]);
int n = (int)(w[3]);
t_float lastval = x->lastval;
t_float a, d, s, r;
switch (x->stage) {
case ATTACK:
if (x->attacktype == LINEAR) {
a = 1000 / (x->a * x->srate);
while (n--) {
*out = lastval + a;
lastval = *(out++);
if (lastval > THRESHOLD) {
x->stage = DECAY;
break;
}
}
} else {
a = SCALE / (CLIP(x->a) * x->srate);
while (n--) {
*out = lastval + a * (1 - lastval);
lastval = *(out++);
if (lastval > THRESHOLD) {
x->stage = DECAY;
break;
}
}
}
case DECAY:
d = SCALE / (CLIP(x->d) * x->srate);
s = x->s;
while (n-- > 0) {
*out = lastval - d * (lastval - s);
if (IS_DENORMAL(*out)) *out = 0.0;
lastval = *(out++);
}
break;
case RELEASE:
r = SCALE / (CLIP(x->r) * x->srate);
while (n--) {
*out = lastval - r * lastval;
if (IS_DENORMAL(*out)) *out = 0.0;
lastval = *(out++);
}
}
x->lastval = lastval;
return (w+4);
}
static void aenv_dsp(t_aenv *x, t_signal **sp)
{
dsp_add(aenv_perform, 3, x, sp[0]->s_vec, sp[0]->s_n);
}
static void aenv_float(t_aenv *x, t_float f)
{
if (f == 0)
x->stage = RELEASE;
else
x->stage = ATTACK;
}
static void *aenv_new(t_symbol *s, int argc, t_atom *argv)
{
t_aenv *x = (t_aenv *)pd_new(aenv_class);
floatinlet_new(&x->x_obj, &x->a);
floatinlet_new(&x->x_obj, &x->d);
floatinlet_new(&x->x_obj, &x->s);
floatinlet_new(&x->x_obj, &x->r);
outlet_new(&x->x_obj, gensym("signal"));
x->srate = sys_getsr();
x->a = 500;
x->d = 500;
x->s = 0.5;
x->r = 500;
x->lastval = 0;
x->stage = RELEASE;
x->attacktype = LOGARITHMIC;
if (argc == 4) {
x->a = atom_getfloat(argv);
x->d = atom_getfloat(argv+1);
x->s = atom_getfloat(argv+2);
x->r = atom_getfloat(argv+3);
}
return (x);
}
static void aenv_lina(t_aenv *x)
{
x->attacktype = LINEAR;
}
static void aenv_loga(t_aenv *x)
{
x->attacktype = LOGARITHMIC;
}
static void aenv_zero(t_aenv *x)
{
x->stage = RELEASE;
x->lastval = 0.0;
}
void aenv_tilde_setup(void)
{
aenv_class = class_new(gensym("aenv~"), (t_newmethod)aenv_new, 0, sizeof(t_aenv), 0, A_GIMME, 0);
class_sethelpsymbol(aenv_class, gensym("help-aenv~.pd"));
class_addmethod(aenv_class, (t_method)aenv_dsp, gensym("dsp"), 0);
class_addfloat(aenv_class, (t_method)aenv_float);
class_addmethod(aenv_class, (t_method)aenv_lina, gensym("lina"), 0);
class_addmethod(aenv_class, (t_method)aenv_loga, gensym("loga"), 0);
class_addmethod(aenv_class, (t_method)aenv_zero, gensym("zero"), 0);
}
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