NULL does not need to be cast to (char *)
[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
47 #define ICES "/usr/bin/ices"
48 #define LOCAL_ICES "/usr/local/bin/ices"
49
50 static char *app = "ICES";
51
52 static char *synopsis = "Encode and stream using 'ices'";
53
54 static char *descrip = 
55 "  ICES(config.xml) Streams to an icecast server using ices\n"
56 "(available separately).  A configuration file must be supplied\n"
57 "for ices (see examples/asterisk-ices.conf). \n";
58
59
60 static int icesencode(char *filename, int fd)
61 {
62         int res;
63         int x;
64         sigset_t fullset, oldset;
65
66         sigfillset(&fullset);
67         pthread_sigmask(SIG_BLOCK, &fullset, &oldset);
68
69         res = fork();
70         if (res < 0) 
71                 ast_log(LOG_WARNING, "Fork failed\n");
72         if (res) {
73                 pthread_sigmask(SIG_SETMASK, &oldset, NULL);
74                 return res;
75         }
76
77         /* Stop ignoring PIPE */
78         signal(SIGPIPE, SIG_DFL);
79         pthread_sigmask(SIG_UNBLOCK, &fullset, NULL);
80
81         if (ast_opt_high_priority)
82                 ast_set_priority(0);
83         dup2(fd, STDIN_FILENO);
84         for (x=STDERR_FILENO + 1;x<1024;x++) {
85                 if ((x != STDIN_FILENO) && (x != STDOUT_FILENO))
86                         close(x);
87         }
88         /* Most commonly installed in /usr/local/bin */
89         execl(ICES, "ices", filename, NULL);
90         /* But many places has it in /usr/bin */
91         execl(LOCAL_ICES, "ices", filename, NULL);
92         /* As a last-ditch effort, try to use PATH */
93         execlp("ices", "ices", filename, NULL);
94         ast_log(LOG_WARNING, "Execute of ices failed\n");
95         _exit(0);
96 }
97
98 static int ices_exec(struct ast_channel *chan, void *data)
99 {
100         int res = 0;
101         int fds[2];
102         int ms = -1;
103         int pid = -1;
104         int flags;
105         int oreadformat;
106         struct timeval last;
107         struct ast_frame *f;
108         char filename[256]="";
109         char *c;
110
111         if (ast_strlen_zero(data)) {
112                 ast_log(LOG_WARNING, "ICES requires an argument (configfile.xml)\n");
113                 return -1;
114         }
115         
116         last = ast_tv(0, 0);
117         
118         if (pipe(fds)) {
119                 ast_log(LOG_WARNING, "Unable to create pipe\n");
120                 return -1;
121         }
122         flags = fcntl(fds[1], F_GETFL);
123         fcntl(fds[1], F_SETFL, flags | O_NONBLOCK);
124         
125         ast_stopstream(chan);
126
127         if (chan->_state != AST_STATE_UP)
128                 res = ast_answer(chan);
129                 
130         if (res) {
131                 close(fds[0]);
132                 close(fds[1]);
133                 ast_log(LOG_WARNING, "Answer failed!\n");
134                 return -1;
135         }
136
137         oreadformat = chan->readformat;
138         res = ast_set_read_format(chan, AST_FORMAT_SLINEAR);
139         if (res < 0) {
140                 close(fds[0]);
141                 close(fds[1]);
142                 ast_log(LOG_WARNING, "Unable to set write format to signed linear\n");
143                 return -1;
144         }
145         if (((char *)data)[0] == '/')
146                 ast_copy_string(filename, (char *) data, sizeof(filename));
147         else
148                 snprintf(filename, sizeof(filename), "%s/%s", ast_config_AST_CONFIG_DIR, (char *)data);
149         /* Placeholder for options */           
150         c = strchr(filename, '|');
151         if (c)
152                 *c = '\0';      
153         res = icesencode(filename, fds[0]);
154         close(fds[0]);
155         if (res >= 0) {
156                 pid = res;
157                 for (;;) {
158                         /* Wait for audio, and stream */
159                         ms = ast_waitfor(chan, -1);
160                         if (ms < 0) {
161                                 ast_debug(1, "Hangup detected\n");
162                                 res = -1;
163                                 break;
164                         }
165                         f = ast_read(chan);
166                         if (!f) {
167                                 ast_debug(1, "Null frame == hangup() detected\n");
168                                 res = -1;
169                                 break;
170                         }
171                         if (f->frametype == AST_FRAME_VOICE) {
172                                 res = write(fds[1], f->data, f->datalen);
173                                 if (res < 0) {
174                                         if (errno != EAGAIN) {
175                                                 ast_log(LOG_WARNING, "Write failed to pipe: %s\n", strerror(errno));
176                                                 res = -1;
177                                                 ast_frfree(f);
178                                                 break;
179                                         }
180                                 }
181                         }
182                         ast_frfree(f);
183                 }
184         }
185         close(fds[1]);
186         
187         if (pid > -1)
188                 kill(pid, SIGKILL);
189         if (!res && oreadformat)
190                 ast_set_read_format(chan, oreadformat);
191
192         return res;
193 }
194
195 static int unload_module(void)
196 {
197         return ast_unregister_application(app);
198 }
199
200 static int load_module(void)
201 {
202         return ast_register_application(app, ices_exec, synopsis, descrip);
203 }
204
205 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Encode and Stream via icecast and ices");