aboutsummaryrefslogtreecommitdiffstats
path: root/apps/app_milliwatt.c
blob: a2f92dcf60a3fe29b847b594e75394bf7fcf6762 (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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
/*
 * Asterisk -- A telephony toolkit for Linux.
 *
 * Digital Milliwatt Test
 * 
 * Copyright (C) 2002, Mark Spencer
 *
 * Mark Spencer <markster@linux-support.net>
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License
 */

#include <asterisk/lock.h>
#include <asterisk/file.h>
#include <asterisk/logger.h>
#include <asterisk/channel.h>
#include <asterisk/pbx.h>
#include <asterisk/module.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>

#include <pthread.h>

static char *tdesc = "Digital Milliwatt (mu-law) Test Application";

static char *app = "Milliwatt";

static char *synopsis = "Generate a Constant 1000Hz tone at 0dbm (mu-law)";

static char *descrip = 
"Milliwatt(): Generate a Constant 1000Hz tone at 0dbm (mu-law)\n";

STANDARD_LOCAL_USER;

LOCAL_USER_DECL;

static char digital_milliwatt[] = {0x1e,0x0b,0x0b,0x1e,0x9e,0x8b,0x8b,0x9e} ;

static void *milliwatt_alloc(struct ast_channel *chan, void *params)
{
int	*indexp;
	indexp = malloc(sizeof(int));
	if (indexp == NULL) return(NULL);
	*indexp = 0;
	return(indexp);
}

static void milliwatt_release(struct ast_channel *chan, void *data)
{
	free(data);
	return;
}

static int milliwatt_generate(struct ast_channel *chan, void *data, int len, int samples)
{
	struct ast_frame wf;
	unsigned char waste[AST_FRIENDLY_OFFSET];
	unsigned char buf[640];
	int i,*indexp = (int *) data;

	if (len > sizeof(buf))
	{
		ast_log(LOG_WARNING,"Only doing %d bytes (%d bytes requested)\n",sizeof(buf),len);
		len = sizeof(buf);
	}
	waste[0] = 0; /* make compiler happy */
	wf.frametype = AST_FRAME_VOICE;
	wf.subclass = AST_FORMAT_ULAW;
	wf.offset = AST_FRIENDLY_OFFSET;
	wf.mallocd = 0;
	wf.data = buf;
	wf.datalen = len;
	wf.samples = wf.datalen;
	wf.src = "app_milliwatt";
	/* create a buffer containing the digital milliwatt pattern */
	for(i = 0; i < len; i++)
	{
		buf[i] = digital_milliwatt[(*indexp)++];
		*indexp &= 7;
	}
	if (ast_write(chan,&wf) < 0)
	{
		ast_log(LOG_WARNING,"Failed to write frame to '%s': %s\n",chan->name,strerror(errno));
		return -1;
	}
	return 0;
}

static struct ast_generator milliwattgen = 
{
	alloc: milliwatt_alloc,
	release: milliwatt_release,
	generate: milliwatt_generate,
} ;

static int milliwatt_exec(struct ast_channel *chan, void *data)
{

	struct localuser *u;
	LOCAL_USER_ADD(u);
	ast_set_write_format(chan, AST_FORMAT_ULAW);
	ast_set_read_format(chan, AST_FORMAT_ULAW);
	if (chan->_state != AST_STATE_UP)
	{
		ast_answer(chan);
	}
	if (ast_activate_generator(chan,&milliwattgen,"milliwatt") < 0)
	{
		ast_log(LOG_WARNING,"Failed to activate generator on '%s'\n",chan->name);
		return -1;
	}
	while(!ast_safe_sleep(chan, 10000));
	ast_deactivate_generator(chan);
	LOCAL_USER_REMOVE(u);
	return -1;
}

int unload_module(void)
{
	STANDARD_HANGUP_LOCALUSERS;
	return ast_unregister_application(app);
}

int load_module(void)
{
	return ast_register_application(app, milliwatt_exec, synopsis, descrip);
}

char *description(void)
{
	return tdesc;
}

int usecount(void)
{
	int res;
	STANDARD_USECOUNT(res);
	return res;
}

char *key()
{
	return ASTERISK_GPL_KEY;
}