media formats: re-architect handling of media for performance improvements
[asterisk/asterisk.git] / channels / chan_bridge_media.c
1 /*
2  * Asterisk -- An open source telephony toolkit.
3  *
4  * Copyright (C) 2013 Digium, Inc.
5  *
6  * Jonathan Rose <jrose@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 /*!
20  * \file
21  * \brief Bridge Media Channels driver
22  *
23  * \author Jonathan Rose <jrose@digium.com>
24  * \author Richard Mudgett <rmudgett@digium.com>
25  *
26  * \brief Bridge Media Channels
27  *
28  * \ingroup channel_drivers
29  */
30
31 /*** MODULEINFO
32         <support_level>core</support_level>
33  ***/
34
35 #include "asterisk.h"
36
37 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
38
39 #include "asterisk/channel.h"
40 #include "asterisk/bridge.h"
41 #include "asterisk/core_unreal.h"
42 #include "asterisk/module.h"
43
44 static int media_call(struct ast_channel *chan, const char *addr, int timeout)
45 {
46         /* ast_call() will fail unconditionally against channels provided by this driver */
47         return -1;
48 }
49
50 static int media_hangup(struct ast_channel *ast)
51 {
52         struct ast_unreal_pvt *p = ast_channel_tech_pvt(ast);
53         int res;
54
55         if (!p) {
56                 return -1;
57         }
58
59         /* Give the pvt a ref to fulfill calling requirements. */
60         ao2_ref(p, +1);
61         res = ast_unreal_hangup(p, ast);
62         ao2_ref(p, -1);
63
64         return res;
65 }
66
67 static struct ast_channel *announce_request(const char *type, struct ast_format_cap *cap,
68         const struct ast_assigned_ids *assignedids, const struct ast_channel *requestor, const char *data, int *cause);
69
70 static struct ast_channel *record_request(const char *type, struct ast_format_cap *cap,
71         const struct ast_assigned_ids *assignedids, const struct ast_channel *requestor, const char *data, int *cause);
72
73 static struct ast_channel_tech announce_tech = {
74         .type = "Announcer",
75         .description = "Bridge Media Announcing Channel Driver",
76         .requester = announce_request,
77         .call = media_call,
78         .hangup = media_hangup,
79
80         .send_digit_begin = ast_unreal_digit_begin,
81         .send_digit_end = ast_unreal_digit_end,
82         .read = ast_unreal_read,
83         .write = ast_unreal_write,
84         .write_video = ast_unreal_write,
85         .exception = ast_unreal_read,
86         .indicate = ast_unreal_indicate,
87         .fixup = ast_unreal_fixup,
88         .send_html = ast_unreal_sendhtml,
89         .send_text = ast_unreal_sendtext,
90         .queryoption = ast_unreal_queryoption,
91         .setoption = ast_unreal_setoption,
92         .properties = AST_CHAN_TP_INTERNAL,
93 };
94
95 static struct ast_channel_tech record_tech = {
96         .type = "Recorder",
97         .description = "Bridge Media Recording Channel Driver",
98         .requester = record_request,
99         .call = media_call,
100         .hangup = media_hangup,
101
102         .send_digit_begin = ast_unreal_digit_begin,
103         .send_digit_end = ast_unreal_digit_end,
104         .read = ast_unreal_read,
105         .write = ast_unreal_write,
106         .write_video = ast_unreal_write,
107         .exception = ast_unreal_read,
108         .indicate = ast_unreal_indicate,
109         .fixup = ast_unreal_fixup,
110         .send_html = ast_unreal_sendhtml,
111         .send_text = ast_unreal_sendtext,
112         .queryoption = ast_unreal_queryoption,
113         .setoption = ast_unreal_setoption,
114         .properties = AST_CHAN_TP_INTERNAL,
115 };
116
117 static struct ast_channel *media_request_helper(struct ast_format_cap *cap, const struct ast_assigned_ids *assignedids,
118         const struct ast_channel *requestor, const char *data, struct ast_channel_tech *tech, const char *role)
119 {
120         struct ast_channel *chan;
121
122         RAII_VAR(struct ast_callid *, callid, NULL, ast_callid_cleanup);
123         RAII_VAR(struct ast_unreal_pvt *, pvt, NULL, ao2_cleanup);
124
125         if (!(pvt = ast_unreal_alloc(sizeof(*pvt), ast_unreal_destructor, cap))) {
126                 return NULL;
127         }
128
129         ast_copy_string(pvt->name, data, sizeof(pvt->name));
130
131         ast_set_flag(pvt, AST_UNREAL_NO_OPTIMIZATION);
132
133         callid = ast_read_threadstorage_callid();
134
135         chan = ast_unreal_new_channels(pvt, tech,
136                 AST_STATE_UP, AST_STATE_UP, NULL, NULL, assignedids, requestor, callid);
137         if (!chan) {
138                 return NULL;
139         }
140
141         ast_answer(pvt->owner);
142         ast_answer(pvt->chan);
143
144         if (ast_channel_add_bridge_role(pvt->chan, role)) {
145                 ast_hangup(chan);
146                 return NULL;
147         }
148
149         return chan;
150 }
151
152 static struct ast_channel *announce_request(const char *type, struct ast_format_cap *cap,
153         const struct ast_assigned_ids *assignedids, const struct ast_channel *requestor, const char *data, int *cause)
154 {
155         return media_request_helper(cap, assignedids, requestor, data, &announce_tech, "announcer");
156 }
157
158 static struct ast_channel *record_request(const char *type, struct ast_format_cap *cap,
159         const struct ast_assigned_ids *assignedids, const struct ast_channel *requestor, const char *data, int *cause)
160 {
161         return media_request_helper(cap, assignedids, requestor, data, &record_tech, "recorder");
162 }
163
164 static void cleanup_capabilities(void)
165 {
166         if (announce_tech.capabilities) {
167                 ao2_ref(announce_tech.capabilities, -1);
168                 announce_tech.capabilities = NULL;
169         }
170
171         if (record_tech.capabilities) {
172                 ao2_ref(record_tech.capabilities, -1);
173                 record_tech.capabilities = NULL;
174         }
175 }
176
177 static int unload_module(void)
178 {
179         ast_channel_unregister(&announce_tech);
180         ast_channel_unregister(&record_tech);
181         cleanup_capabilities();
182         return 0;
183 }
184
185 static int load_module(void)
186 {
187         announce_tech.capabilities = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
188         if (!announce_tech.capabilities) {
189                 return AST_MODULE_LOAD_DECLINE;
190         }
191
192         record_tech.capabilities = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
193         if (!record_tech.capabilities) {
194                 return AST_MODULE_LOAD_DECLINE;
195         }
196
197         ast_format_cap_append_by_type(announce_tech.capabilities, AST_MEDIA_TYPE_UNKNOWN);
198         ast_format_cap_append_by_type(record_tech.capabilities, AST_MEDIA_TYPE_UNKNOWN);
199
200         if (ast_channel_register(&announce_tech)) {
201                 ast_log(LOG_ERROR, "Unable to register channel technology %s(%s).\n",
202                         announce_tech.type, announce_tech.description);
203                 cleanup_capabilities();
204                 return AST_MODULE_LOAD_DECLINE;
205         }
206
207         if (ast_channel_register(&record_tech)) {
208                 ast_log(LOG_ERROR, "Unable to register channel technology %s(%s).\n",
209                         record_tech.type, record_tech.description);
210                 cleanup_capabilities();
211                 return AST_MODULE_LOAD_DECLINE;
212         }
213
214         return AST_MODULE_LOAD_SUCCESS;
215 }
216
217 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Bridge Media Channel Driver",
218     .load = load_module,
219     .unload = unload_module,
220 );