Revert inadvertant code commit to app_originate
[asterisk/asterisk.git] / bridges / bridge_simple.c
1 /*
2  * Asterisk -- An open source telephony toolkit.
3  *
4  * Copyright (C) 2007, Digium, Inc.
5  *
6  * Joshua Colp <jcolp@digium.com>
7  *
8  * See http://www.asterisk.org for more information about
9  * the Asterisk project. Please do not directly contact
10  * any of the maintainers of this project for assistance;
11  * the project provides a web site, mailing lists and IRC
12  * channels for your use.
13  *
14  * This program is free software, distributed under the terms of
15  * the GNU General Public License Version 2. See the LICENSE file
16  * at the top of the source tree.
17  */
18
19 /*! \file
20  *
21  * \brief Simple two channel bridging module
22  *
23  * \author Joshua Colp <jcolp@digium.com>
24  *
25  * \ingroup bridges
26  */
27
28 #include "asterisk.h"
29
30 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
31
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35 #include <sys/types.h>
36 #include <sys/stat.h>
37
38 #include "asterisk/module.h"
39 #include "asterisk/channel.h"
40 #include "asterisk/bridging.h"
41 #include "asterisk/bridging_technology.h"
42 #include "asterisk/frame.h"
43
44 static int simple_bridge_join(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
45 {
46         struct ast_channel *c0 = AST_LIST_FIRST(&bridge->channels)->chan, *c1 = AST_LIST_LAST(&bridge->channels)->chan;
47
48         /* If this is the first channel we can't make it compatible... unless we make it compatible with itself O.o */
49         if (AST_LIST_FIRST(&bridge->channels) == AST_LIST_LAST(&bridge->channels)) {
50                 return 0;
51         }
52
53         /* See if we need to make these compatible */
54         if (((c0->writeformat == c1->readformat) && (c0->readformat == c1->writeformat) && (c0->nativeformats == c1->nativeformats))) {
55                 return 0;
56         }
57
58         /* BOOM! We do. */
59         return ast_channel_make_compatible(c0, c1);
60 }
61
62 static enum ast_bridge_write_result simple_bridge_write(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
63 {
64         struct ast_bridge_channel *other = NULL;
65
66         /* If this is the only channel in this bridge then immediately exit */
67         if (AST_LIST_FIRST(&bridge->channels) == AST_LIST_LAST(&bridge->channels)) {
68                 return AST_BRIDGE_WRITE_FAILED;
69         }
70
71         /* Find the channel we actually want to write to */
72         if (!(other = (AST_LIST_FIRST(&bridge->channels) == bridge_channel ? AST_LIST_LAST(&bridge->channels) : AST_LIST_FIRST(&bridge->channels)))) {
73                 return AST_BRIDGE_WRITE_FAILED;
74         }
75
76         /* Write the frame out if they are in the waiting state... don't worry about freeing it, the bridging core will take care of it */
77         if (other->state == AST_BRIDGE_CHANNEL_STATE_WAIT) {
78                 ast_write(other->chan, frame);
79         }
80
81         return AST_BRIDGE_WRITE_SUCCESS;
82 }
83
84 static struct ast_bridge_technology simple_bridge = {
85         .name = "simple_bridge",
86         .capabilities = AST_BRIDGE_CAPABILITY_1TO1MIX | AST_BRIDGE_CAPABILITY_THREAD,
87         .preference = AST_BRIDGE_PREFERENCE_MEDIUM,
88         .formats = AST_FORMAT_AUDIO_MASK | AST_FORMAT_VIDEO_MASK | AST_FORMAT_TEXT_MASK,
89         .join = simple_bridge_join,
90         .write = simple_bridge_write,
91 };
92
93 static int unload_module(void)
94 {
95         return ast_bridge_technology_unregister(&simple_bridge);
96 }
97
98 static int load_module(void)
99 {
100         return ast_bridge_technology_register(&simple_bridge);
101 }
102
103 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Simple two channel bridging module");