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/*
* eadsr.c - exponential attack decay sustain release 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"
typedef struct eadsrctl
{
t_float c_attack;
t_float c_decay;
t_float c_sustain;
t_float c_release;
t_float c_state;
t_float c_target;
} t_eadsrctl;
typedef struct eadsr
{
t_object x_obj;
t_float x_sr;
t_eadsrctl x_ctl;
} t_eadsr;
void eadsr_attack(t_eadsr *x, t_floatarg f)
{
x->x_ctl.c_attack = milliseconds_2_one_minus_realpole(f);
}
void eadsr_decay(t_eadsr *x, t_floatarg f)
{
x->x_ctl.c_decay = milliseconds_2_one_minus_realpole(f);
}
void eadsr_sustain(t_eadsr *x, t_floatarg f)
{
if (f>ENVELOPE_MAX) f = ENVELOPE_MAX;
if (f<ENVELOPE_MIN) f = ENVELOPE_MIN;
x->x_ctl.c_sustain = f;
}
void eadsr_release(t_eadsr *x, t_floatarg f)
{
x->x_ctl.c_release = milliseconds_2_one_minus_realpole(f);
}
void eadsr_start(t_eadsr *x)
{
x->x_ctl.c_target = 1;
x->x_ctl.c_state = 0.0f;
}
void eadsr_stop(t_eadsr *x)
{
x->x_ctl.c_target = 0;
}
void eadsr_float(t_eadsr *x, t_floatarg f)
{
if (f == 0.0f) eadsr_stop(x);
else eadsr_start(x);
}
static t_int *eadsr_perform(t_int *w)
{
t_float *out = (t_float *)(w[3]);
t_eadsrctl *ctl = (t_eadsrctl *)(w[1]);
t_float attack = ctl->c_attack;
t_float decay = ctl->c_decay;
t_float sustain = ctl->c_sustain;
t_float release = ctl->c_release;
t_float state = ctl->c_state;
t_float target = ctl->c_target;
t_int n = (t_int)(w[2]);
t_int i;
for (i = 0; i < n; i++){
if (target == 1.0f){
/* attack */
*out++ = state;
state += attack*(1 - state);
target = (state > ENVELOPE_MAX) ? sustain : 1.0f;
}
else if (target == 0.0f){
/* release */
*out++ = state;
state -= release*state;
}
else{
/* decay */
*out++ = state;
state -= decay*(state-sustain);
}
}
/* save state */
ctl->c_state = IS_DENORMAL(state) ? 0 : state;
ctl->c_target = target;
return (w+4);
}
static void eadsr_dsp(t_eadsr *x, t_signal **sp)
{
x->x_sr = sp[0]->s_sr;
dsp_add(eadsr_perform, 3, &x->x_ctl, sp[0]->s_n, (t_int)sp[0]->s_vec);
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}
void eadsr_free(void)
{
}
t_class *eadsr_class;
void *eadsr_new(t_floatarg attack, t_floatarg decay,
t_floatarg sustain, t_floatarg release)
{
t_eadsr *x = (t_eadsr *)pd_new(eadsr_class);
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"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("sustain"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("release"));
outlet_new(&x->x_obj, gensym("signal"));
x->x_ctl.c_state = 0;
x->x_ctl.c_target = 0;
eadsr_attack(x, attack);
eadsr_decay(x, decay);
eadsr_sustain(x, sustain);
eadsr_release(x, release);
return (void *)x;
}
void eadsr_tilde_setup(void)
{
//post("eadsr~ v0.1");
eadsr_class = class_new(gensym("eadsr~"), (t_newmethod)eadsr_new,
(t_method)eadsr_free, sizeof(t_eadsr), 0, A_DEFFLOAT,
A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, 0);
class_addmethod(eadsr_class, (t_method)eadsr_float,
gensym("float"), A_FLOAT, 0);
class_addmethod(eadsr_class, (t_method)eadsr_start,
gensym("start"), 0);
class_addmethod(eadsr_class, (t_method)eadsr_start, gensym("bang"), 0);
class_addmethod(eadsr_class, (t_method)eadsr_stop, gensym("stop"), 0);
class_addmethod(eadsr_class, (t_method)eadsr_dsp, gensym("dsp"), A_CANT, 0);
class_addmethod(eadsr_class, (t_method)eadsr_attack,
gensym("attack"), A_FLOAT, 0);
class_addmethod(eadsr_class, (t_method)eadsr_decay,
gensym("decay"), A_FLOAT, 0);
class_addmethod(eadsr_class, (t_method)eadsr_sustain,
gensym("sustain"), A_FLOAT, 0);
class_addmethod(eadsr_class, (t_method)eadsr_release,
gensym("release"), A_FLOAT, 0);
}