Merge "astobj2: Create function to copy weak proxied objects from container."
[asterisk/asterisk.git] / apps / app_echo.c
1 /*
2  * Asterisk -- An open source telephony toolkit.
3  *
4  * Copyright (C) 1999 - 2005, Digium, Inc.
5  *
6  * Mark Spencer <markster@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 Echo application -- play back what you hear to evaluate latency
22  *
23  * \author Mark Spencer <markster@digium.com>
24  *
25  * \ingroup applications
26  */
27
28 /*** MODULEINFO
29         <support_level>core</support_level>
30  ***/
31
32 #include "asterisk.h"
33
34 #include "asterisk/file.h"
35 #include "asterisk/module.h"
36 #include "asterisk/channel.h"
37
38 /*** DOCUMENTATION
39         <application name="Echo" language="en_US">
40                 <synopsis>
41                         Echo media, DTMF back to the calling party
42                 </synopsis>
43                 <syntax />
44                 <description>
45                         <para>Echos back any media or DTMF frames read from the calling
46                         channel back to itself. This will not echo CONTROL, MODEM, or NULL
47                         frames. Note: If '#' detected application exits.</para>
48                         <para>This application does not automatically answer and should be
49                         preceeded by an application such as Answer() or Progress().</para>
50                 </description>
51         </application>
52  ***/
53
54 static const char app[] = "Echo";
55
56 static int echo_exec(struct ast_channel *chan, const char *data)
57 {
58         int res = -1;
59         int fir_sent = 0;
60
61         while (ast_waitfor(chan, -1) > -1) {
62                 struct ast_frame *f = ast_read(chan);
63                 if (!f) {
64                         break;
65                 }
66                 f->delivery.tv_sec = 0;
67                 f->delivery.tv_usec = 0;
68                 if (f->frametype == AST_FRAME_CONTROL
69                         && f->subclass.integer == AST_CONTROL_VIDUPDATE
70                         && !fir_sent) {
71                         if (ast_write(chan, f) < 0) {
72                                 ast_frfree(f);
73                                 goto end;
74                         }
75                         fir_sent = 1;
76                 }
77                 if (!fir_sent && f->frametype == AST_FRAME_VIDEO) {
78                         struct ast_frame frame = {
79                                 .frametype = AST_FRAME_CONTROL,
80                                 .subclass.integer = AST_CONTROL_VIDUPDATE,
81                         };
82                         ast_write(chan, &frame);
83                         fir_sent = 1;
84                 }
85                 if (f->frametype != AST_FRAME_CONTROL
86                         && f->frametype != AST_FRAME_MODEM
87                         && f->frametype != AST_FRAME_NULL
88                         && ast_write(chan, f)) {
89                         ast_frfree(f);
90                         goto end;
91                 }
92                 if ((f->frametype == AST_FRAME_DTMF) && (f->subclass.integer == '#')) {
93                         res = 0;
94                         ast_frfree(f);
95                         goto end;
96                 }
97                 ast_frfree(f);
98         }
99 end:
100         return res;
101 }
102
103 static int unload_module(void)
104 {
105         return ast_unregister_application(app);
106 }
107
108 static int load_module(void)
109 {
110         return ast_register_application_xml(app, echo_exec);
111 }
112
113 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Simple Echo Application");