Standardized routines for forking processes (keeps all the specialized code in one...
[asterisk/asterisk.git] / apps / app_ices.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 Stream to an icecast server via ICES (see contrib/asterisk-ices.xml)
22  *
23  * \author Mark Spencer <markster@digium.com>
24  * 
25  * \extref ICES - http://www.icecast.org/ices.php
26  *
27  * \ingroup applications
28  */
29  
30 #include "asterisk.h"
31
32 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
33
34 #include <signal.h>
35 #include <fcntl.h>
36 #include <sys/time.h>
37
38 #include "asterisk/paths.h"     /* use ast_config_AST_CONFIG_DIR */
39 #include "asterisk/lock.h"
40 #include "asterisk/file.h"
41 #include "asterisk/channel.h"
42 #include "asterisk/frame.h"
43 #include "asterisk/pbx.h"
44 #include "asterisk/module.h"
45 #include "asterisk/translate.h"
46 #include "asterisk/app.h"
47
48 #define ICES "/usr/bin/ices"
49 #define LOCAL_ICES "/usr/local/bin/ices"
50
51 static char *app = "ICES";
52
53 static char *synopsis = "Encode and stream using 'ices'";
54
55 static char *descrip = 
56 "  ICES(config.xml) Streams to an icecast server using ices\n"
57 "(available separately).  A configuration file must be supplied\n"
58 "for ices (see examples/asterisk-ices.conf). \n";
59
60
61 static int icesencode(char *filename, int fd)
62 {
63         int res;
64
65         res = ast_safe_fork(0);
66         if (res < 0) 
67                 ast_log(LOG_WARNING, "Fork failed\n");
68         if (res) {
69                 return res;
70         }
71
72         if (ast_opt_high_priority)
73                 ast_set_priority(0);
74         dup2(fd, STDIN_FILENO);
75         ast_close_fds_above_n(STDERR_FILENO);
76         /* Most commonly installed in /usr/local/bin */
77         execl(ICES, "ices", filename, (char *)NULL);
78         /* But many places has it in /usr/bin */
79         execl(LOCAL_ICES, "ices", filename, (char *)NULL);
80         /* As a last-ditch effort, try to use PATH */
81         execlp("ices", "ices", filename, (char *)NULL);
82         ast_log(LOG_WARNING, "Execute of ices failed\n");
83         _exit(0);
84 }
85
86 static int ices_exec(struct ast_channel *chan, void *data)
87 {
88         int res = 0;
89         int fds[2];
90         int ms = -1;
91         int pid = -1;
92         int flags;
93         int oreadformat;
94         struct timeval last;
95         struct ast_frame *f;
96         char filename[256]="";
97         char *c;
98
99         if (ast_strlen_zero(data)) {
100                 ast_log(LOG_WARNING, "ICES requires an argument (configfile.xml)\n");
101                 return -1;
102         }
103         
104         last = ast_tv(0, 0);
105         
106         if (pipe(fds)) {
107                 ast_log(LOG_WARNING, "Unable to create pipe\n");
108                 return -1;
109         }
110         flags = fcntl(fds[1], F_GETFL);
111         fcntl(fds[1], F_SETFL, flags | O_NONBLOCK);
112         
113         ast_stopstream(chan);
114
115         if (chan->_state != AST_STATE_UP)
116                 res = ast_answer(chan);
117                 
118         if (res) {
119                 close(fds[0]);
120                 close(fds[1]);
121                 ast_log(LOG_WARNING, "Answer failed!\n");
122                 return -1;
123         }
124
125         oreadformat = chan->readformat;
126         res = ast_set_read_format(chan, AST_FORMAT_SLINEAR);
127         if (res < 0) {
128                 close(fds[0]);
129                 close(fds[1]);
130                 ast_log(LOG_WARNING, "Unable to set write format to signed linear\n");
131                 return -1;
132         }
133         if (((char *)data)[0] == '/')
134                 ast_copy_string(filename, (char *) data, sizeof(filename));
135         else
136                 snprintf(filename, sizeof(filename), "%s/%s", ast_config_AST_CONFIG_DIR, (char *)data);
137         /* Placeholder for options */           
138         c = strchr(filename, '|');
139         if (c)
140                 *c = '\0';      
141         res = icesencode(filename, fds[0]);
142         close(fds[0]);
143         if (res >= 0) {
144                 pid = res;
145                 for (;;) {
146                         /* Wait for audio, and stream */
147                         ms = ast_waitfor(chan, -1);
148                         if (ms < 0) {
149                                 ast_debug(1, "Hangup detected\n");
150                                 res = -1;
151                                 break;
152                         }
153                         f = ast_read(chan);
154                         if (!f) {
155                                 ast_debug(1, "Null frame == hangup() detected\n");
156                                 res = -1;
157                                 break;
158                         }
159                         if (f->frametype == AST_FRAME_VOICE) {
160                                 res = write(fds[1], f->data, f->datalen);
161                                 if (res < 0) {
162                                         if (errno != EAGAIN) {
163                                                 ast_log(LOG_WARNING, "Write failed to pipe: %s\n", strerror(errno));
164                                                 res = -1;
165                                                 ast_frfree(f);
166                                                 break;
167                                         }
168                                 }
169                         }
170                         ast_frfree(f);
171                 }
172         }
173         close(fds[1]);
174
175         if (pid > -1)
176                 kill(pid, SIGKILL);
177         if (!res && oreadformat)
178                 ast_set_read_format(chan, oreadformat);
179
180         return res;
181 }
182
183 static int unload_module(void)
184 {
185         return ast_unregister_application(app);
186 }
187
188 static int load_module(void)
189 {
190         return ast_register_application(app, ices_exec, synopsis, descrip);
191 }
192
193 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Encode and Stream via icecast and ices");