aboutsummaryrefslogtreecommitdiffstats
path: root/apps/app_milliwatt.c
blob: 5a2a9e18d764ddc308d684323f4aa144227a58c2 (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
149
150
151
152
153
154
155
156
157
/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 *
 * 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. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief Digital Milliwatt Test
 *
 * \author Mark Spencer <markster@digium.com>
 * 
 * \ingroup applications
 */

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision$")

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>

#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 "asterisk/utils.h"

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";

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

static void *milliwatt_alloc(struct ast_channel *chan, void *params)
{
	return ast_calloc(1, sizeof(int));
}

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)
{
	unsigned char buf[AST_FRIENDLY_OFFSET + 640];
	const int maxsamples = sizeof (buf) / sizeof (buf[0]);
	int i, *indexp = (int *) data;
	struct ast_frame wf = {
		.frametype = AST_FRAME_VOICE,
		.subclass = AST_FORMAT_ULAW,
		.offset = AST_FRIENDLY_OFFSET,
		.data = buf + AST_FRIENDLY_OFFSET,
		.src = __FUNCTION__,
	};

	/* Instead of len, use samples, because channel.c generator_force
	* generate(chan, tmp, 0, 160) ignores len. In any case, len is
	* a multiple of samples, given by number of samples times bytes per
	* sample. In the case of ulaw, len = samples. for signed linear
	* len = 2 * samples */
	if (samples > maxsamples) {
		ast_log(LOG_WARNING, "Only doing %d samples (%d requested)\n", maxsamples, samples);
		samples = maxsamples;
	}
	len = samples * sizeof (buf[0]);
	wf.datalen = len;
	wf.samples = samples;

	/* create a buffer containing the digital milliwatt pattern */
	for (i = 0; i < len; i++) {
		buf[AST_FRIENDLY_OFFSET + 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 ast_module_user *u;
	u = ast_module_user_add(chan);

	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);
		ast_module_user_remove(u);
		return -1;
	}

	while(!ast_safe_sleep(chan, 10000));

	ast_deactivate_generator(chan);

	ast_module_user_remove(u);

	return -1;
}

static int unload_module(void)
{
	int res;

	res = ast_unregister_application(app);

	ast_module_user_hangup_all();

	return res;
}

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

AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Digital Milliwatt (mu-law) Test Application");