aboutsummaryrefslogtreecommitdiff
path: root/modules/ear.c
blob: efe9b3f15714812462fb95aed22d5b0ddd9a1f88 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
/*
 *   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;

}

void ear_stop(t_ear *x)
{
    x->x_ctl.c_target = 0;

}

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 = 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_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);


}