dahdi_echocan_jpah.c
3.47 KB
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
135
136
137
138
139
140
141
142
143
144
/*
* ECHO_CAN_JPAH
*
* by Jason Parker
*
* Based upon mg2ec.h - sort of.
* This "echo can" will completely hose your audio.
* Don't use it unless you're absolutely sure you know what you're doing.
*
* Copyright (C) 2007-2012, Digium, Inc.
*
* All rights reserved.
*
*/
/*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2 as published by the
* Free Software Foundation. See the LICENSE file included with
* this program for more details.
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/ctype.h>
#include <linux/moduleparam.h>
#include <dahdi/kernel.h>
static int debug;
static int echo_can_create(struct dahdi_chan *chan, struct dahdi_echocanparams *ecp,
struct dahdi_echocanparam *p, struct dahdi_echocan_state **ec);
static void echo_can_free(struct dahdi_chan *chan, struct dahdi_echocan_state *ec);
static void echo_can_process(struct dahdi_echocan_state *ec, short *isig, const short *iref, u32 size);
static int echo_can_traintap(struct dahdi_echocan_state *ec, int pos, short val);
static const char *name = "JPAH";
static const char *ec_name(const struct dahdi_chan *chan) { return name; }
static const struct dahdi_echocan_factory my_factory = {
.get_name = ec_name,
.owner = THIS_MODULE,
.echocan_create = echo_can_create,
};
static const struct dahdi_echocan_ops my_ops = {
.echocan_free = echo_can_free,
.echocan_process = echo_can_process,
.echocan_traintap = echo_can_traintap,
};
struct ec_pvt {
struct dahdi_echocan_state dahdi;
int blah;
};
#define dahdi_to_pvt(a) container_of(a, struct ec_pvt, dahdi)
static int echo_can_create(struct dahdi_chan *chan, struct dahdi_echocanparams *ecp,
struct dahdi_echocanparam *p, struct dahdi_echocan_state **ec)
{
struct ec_pvt *pvt;
if (ecp->param_count > 0) {
printk(KERN_WARNING "JPAH does not support parameters; failing request\n");
return -EINVAL;
}
pvt = kzalloc(sizeof(*pvt), GFP_KERNEL);
if (!pvt)
return -ENOMEM;
pvt->dahdi.ops = &my_ops;
*ec = &pvt->dahdi;
return 0;
}
static void echo_can_free(struct dahdi_chan *chan, struct dahdi_echocan_state *ec)
{
struct ec_pvt *pvt = dahdi_to_pvt(ec);
kfree(pvt);
}
static void echo_can_process(struct dahdi_echocan_state *ec, short *isig, const short *iref, u32 size)
{
struct ec_pvt *pvt = dahdi_to_pvt(ec);
u32 x;
for (x = 0; x < size; x++) {
if (pvt->blah < 2) {
pvt->blah++;
*isig++ = 0;
} else {
pvt->blah = 0;
isig++;
}
}
}
static int echo_can_traintap(struct dahdi_echocan_state *ec, int pos, short val)
{
return 0;
}
static int __init mod_init(void)
{
if (dahdi_register_echocan_factory(&my_factory)) {
module_printk(KERN_ERR, "could not register with DAHDI core\n");
return -EPERM;
}
module_printk(KERN_NOTICE, "Registered echo canceler '%s'\n",
my_factory.get_name(NULL));
return 0;
}
static void __exit mod_exit(void)
{
dahdi_unregister_echocan_factory(&my_factory);
}
module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_DESCRIPTION("DAHDI Jason Parker Audio Hoser");
MODULE_AUTHOR("Jason Parker <[email protected]>");
MODULE_LICENSE("GPL v2");
module_init(mod_init);
module_exit(mod_exit);