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/*
* ear.c - exponential attack 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 earctl
{
t_float c_attack;
t_float c_release;
t_float c_state;
t_float c_target;
} t_earctl;
typedef struct ear
{
t_object x_obj;
t_float x_sr;
t_earctl x_ctl;
} t_ear;
void ear_attack(t_ear *x, t_floatarg f)
{
x->x_ctl.c_attack = milliseconds_2_one_minus_realpole(f);
}
void ear_release(t_ear *x, t_floatarg f)
{
x->x_ctl.c_release = milliseconds_2_one_minus_realpole(f);
}
void ear_start(t_ear *x)
{
x->x_ctl.c_target = 1;
x->x_ctl.c_state = 0.0f;
}
void ear_stop(t_ear *x)
{
x->x_ctl.c_target = 0;
}
void ear_float(t_ear *x, t_floatarg f)
{
if (f == 0.0f) ear_stop(x);
else ear_start(x);
}
static t_int *ear_perform(t_int *w)
{
t_float *out = (float *)(w[3]);
t_earctl *ctl = (t_earctl *)(w[1]);
t_float attack = ctl->c_attack;
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;
if (target) /* attack phase */
for (i = 0; i < n; i++)
{
*out++ = state;
state += attack*(1 - state);
}
else /* release phase */
for (i = 0; i < n; i++)
{
*out++ = state;
state -= release*state;
}
ctl->c_state = IS_DENORMAL(state) ? 0 : state;
return (w+4);
}
static void ear_dsp(t_ear *x, t_signal **sp)
{
x->x_sr = sp[0]->s_sr;
dsp_add(ear_perform, 3, &x->x_ctl, sp[0]->s_n, sp[0]->s_vec);
}
void ear_free(void)
{
}
t_class *ear_class; /* attack - release */
void *ear_new(t_floatarg attack, t_floatarg release)
{
t_ear *x = (t_ear *)pd_new(ear_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("release"));
outlet_new(&x->x_obj, gensym("signal"));
ear_attack(x,attack);
ear_release(x,release);
x->x_ctl.c_state = 0;
x->x_ctl.c_target = 0;
return (void *)x;
}
void ear_tilde_setup(void)
{
//post("ear~ v0.1");
ear_class = class_new(gensym("ear~"), (t_newmethod)ear_new,
(t_method)ear_free, sizeof(t_ear), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
class_addmethod(ear_class, (t_method)ear_float, gensym("float"), A_FLOAT, 0);
class_addmethod(ear_class, (t_method)ear_start, gensym("start"), 0);
class_addmethod(ear_class, (t_method)ear_start, gensym("bang"), 0);
class_addmethod(ear_class, (t_method)ear_stop, gensym("stop"), 0);
class_addmethod(ear_class, (t_method)ear_dsp, gensym("dsp"), 0);
class_addmethod(ear_class,
(t_method)ear_attack, gensym("attack"), A_FLOAT, 0);
class_addmethod(ear_class,
(t_method)ear_release, gensym("release"), A_FLOAT, 0);
}
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