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/*
* ead.c - exponential attack decay envelope
* 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 "extlib_util.h"
/* pointer to */
t_class *ead_class;
/* state data fpr attack/decay dsp plugin */
typedef struct eadctl
{
t_float c_attack;
t_float c_decay;
t_float c_state;
t_int c_target;
} t_eadctl;
/* object data structure */
typedef struct ead
{
t_object x_obj;
t_eadctl x_ctl;
} t_ead;
static void ead_attack(t_ead *x, t_floatarg f)
{
x->x_ctl.c_attack = milliseconds_2_one_minus_realpole(f);
}
static void ead_decay(t_ead *x, t_floatarg f)
{
x->x_ctl.c_decay = milliseconds_2_one_minus_realpole(f);
}
static void ead_start(t_ead *x)
{
/* reset state if necessary to prevent skipping */
// always reset, seems to be safest
//if (x->x_ctl.c_target == 1)
x->x_ctl.c_state = 0.0f;
x->x_ctl.c_target = 1;
}
/* dsp callback function, not a method */
static t_int *ead_perform(t_int *w)
{
/* interprete arguments */
t_float *out = (t_float *)(w[3]);
t_eadctl *ctl = (t_eadctl *)(w[1]);
t_float attack = ctl->c_attack;
t_float decay = ctl->c_decay;
t_float state = ctl->c_state;
t_int n = (t_int)(w[2]);
t_int i;
/* A/D code */
for (i = 0; i < n; i++){
switch(ctl->c_target){
case 1:
/* attack phase */
*out++ = state;
state += attack*(1 - state);
ctl->c_target = (state <= ENVELOPE_MAX);
break;
default:
/* decay phase */
*out++ = state;
state -= decay*state;
break;
}
}
/* save state */
ctl->c_state = IS_DENORMAL(state) ? 0 : state;
return (w+4);
}
static void ead_dsp(t_ead *x, t_signal **sp)
{
dsp_add(ead_perform, 3, &x->x_ctl, sp[0]->s_n, sp[0]->s_vec);
}
/* destructor */
static void ead_free(void)
{
}
/* constructor */
static void *ead_new(t_floatarg attack, t_floatarg decay,
t_floatarg sustain, t_floatarg release)
{
/* create instance */
t_ead *x = (t_ead *)pd_new(ead_class);
/* create new inlets, convert incoming message float to attack/decay */
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("attack"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("decay"));
/* create a dsp outlet */
outlet_new(&x->x_obj, gensym("signal"));
/* initialize */
x->x_ctl.c_state = 0;
x->x_ctl.c_target = 0;
ead_attack(x, attack);
ead_decay(x, decay);
/* return instance */
return (void *)x;
}
void ead_tilde_setup(void)
{
//post("ead~ v0.1");
ead_class = class_new(gensym("ead~"), (t_newmethod)ead_new,
(t_method)ead_free, sizeof(t_ead), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
class_addmethod(ead_class, (t_method)ead_start, gensym("start"), 0);
class_addmethod(ead_class, (t_method)ead_start, gensym("bang"), 0);
class_addmethod(ead_class, (t_method)ead_dsp, gensym("dsp"), 0);
class_addmethod(ead_class, (t_method)ead_attack,
gensym("attack"), A_FLOAT, 0);
class_addmethod(ead_class, (t_method)ead_decay,
gensym("decay"), A_FLOAT, 0);
}
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