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  * \ingroup applications
  26  */
  27
  28 #include "asterisk.h"
  29
  30 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  31
  32 #include <string.h>
  33 #include <stdio.h>
  34 #include <signal.h>
  35 #include <stdlib.h>
  36 #include <unistd.h>
  37 #include <fcntl.h>
  38 #include <sys/time.h>
  39 #include <errno.h>
  40
  41 #include "asterisk/lock.h"
  42 #include "asterisk/file.h"
  43 #include "asterisk/logger.h"
  44 #include "asterisk/channel.h"
  45 #include "asterisk/frame.h"
  46 #include "asterisk/pbx.h"
  47 #include "asterisk/module.h"
  48 #include "asterisk/translate.h"
  49 #include "asterisk/options.h"
  50
  51 #define ICES "/usr/bin/ices"
  52 #define LOCAL_ICES "/usr/local/bin/ices"
  53
  54 static char *app = "ICES";
  55
  56 static char *synopsis = "Encode and stream using 'ices'";
  57
  58 static char *descrip =
  59 "  ICES(config.xml) Streams to an icecast server using ices\n"
  60 "(available separately).  A configuration file must be supplied\n"
  61 "for ices (see examples/asterisk-ices.conf). \n";
  62
  63
  64 static int icesencode(char *filename, int fd)
  65 {
  66         int res;
  67         int x;
  68         sigset_t fullset, oldset;
  69
  70         sigfillset(&fullset);
  71         pthread_sigmask(SIG_BLOCK, &fullset, &oldset);
  72
  73         res = fork();
  74         if (res < 0)
  75                 ast_log(LOG_WARNING, "Fork failed\n");
  76         if (res) {
  77                 pthread_sigmask(SIG_SETMASK, &oldset, NULL);
  78                 return res;
  79         }
  80
  81         /* Stop ignoring PIPE */
  82         signal(SIGPIPE, SIG_DFL);
  83         pthread_sigmask(SIG_UNBLOCK, &fullset, NULL);
  84
  85         if (ast_opt_high_priority)
  86                 ast_set_priority(0);
  87         dup2(fd, STDIN_FILENO);
  88         for (x=STDERR_FILENO + 1;x<1024;x++) {
  89                 if ((x != STDIN_FILENO) && (x != STDOUT_FILENO))
  90                         close(x);
  91         }
  92         /* Most commonly installed in /usr/local/bin */
  93         execl(ICES, "ices", filename, (char *)NULL);
  94         /* But many places has it in /usr/bin */
  95         execl(LOCAL_ICES, "ices", filename, (char *)NULL);
  96         /* As a last-ditch effort, try to use PATH */
  97         execlp("ices", "ices", filename, (char *)NULL);
  98         ast_log(LOG_WARNING, "Execute of ices failed\n");
  99         _exit(0);
 100 }
 101
 102 static int ices_exec(struct ast_channel *chan, void *data)
 103 {
 104         int res=0;
 105         struct ast_module_user *u;
 106         int fds[2];
 107         int ms = -1;
 108         int pid = -1;
 109         int flags;
 110         int oreadformat;
 111         struct timeval last;
 112         struct ast_frame *f;
 113         char filename[256]="";
 114         char *c;
 115
 116         if (ast_strlen_zero(data)) {
 117                 ast_log(LOG_WARNING, "ICES requires an argument (configfile.xml)\n");
 118                 return -1;
 119         }
 120
 121         u = ast_module_user_add(chan);
 122
 123         last = ast_tv(0, 0);
 124
 125         if (pipe(fds)) {
 126                 ast_log(LOG_WARNING, "Unable to create pipe\n");
 127                 ast_module_user_remove(u);
 128                 return -1;
 129         }
 130         flags = fcntl(fds[1], F_GETFL);
 131         fcntl(fds[1], F_SETFL, flags | O_NONBLOCK);
 132
 133         ast_stopstream(chan);
 134
 135         if (chan->_state != AST_STATE_UP)
 136                 res = ast_answer(chan);
 137
 138         if (res) {
 139                 close(fds[0]);
 140                 close(fds[1]);
 141                 ast_log(LOG_WARNING, "Answer failed!\n");
 142                 ast_module_user_remove(u);
 143                 return -1;
 144         }
 145
 146         oreadformat = chan->readformat;
 147         res = ast_set_read_format(chan, AST_FORMAT_SLINEAR);
 148         if (res < 0) {
 149                 close(fds[0]);
 150                 close(fds[1]);
 151                 ast_log(LOG_WARNING, "Unable to set write format to signed linear\n");
 152                 ast_module_user_remove(u);
 153                 return -1;
 154         }
 155         if (((char *)data)[0] == '/')
 156                 ast_copy_string(filename, (char *) data, sizeof(filename));
 157         else
 158                 snprintf(filename, sizeof(filename), "%s/%s", (char *)ast_config_AST_CONFIG_DIR, (char *)data);
 159         /* Placeholder for options */
 160         c = strchr(filename, '|');
 161         if (c)
 162                 *c = '\0';
 163         res = icesencode(filename, fds[0]);
 164         close(fds[0]);
 165         if (res >= 0) {
 166                 pid = res;
 167                 for (;;) {
 168                         /* Wait for audio, and stream */
 169                         ms = ast_waitfor(chan, -1);
 170                         if (ms < 0) {
 171                                 ast_log(LOG_DEBUG, "Hangup detected\n");
 172                                 res = -1;
 173                                 break;
 174                         }
 175                         f = ast_read(chan);
 176                         if (!f) {
 177                                 ast_log(LOG_DEBUG, "Null frame == hangup() detected\n");
 178                                 res = -1;
 179                                 break;
 180                         }
 181                         if (f->frametype == AST_FRAME_VOICE) {
 182                                 res = write(fds[1], f->data, f->datalen);
 183                                 if (res < 0) {
 184                                         if (errno != EAGAIN) {
 185                                                 ast_log(LOG_WARNING, "Write failed to pipe: %s\n", strerror(errno));
 186                                                 res = -1;
 187                                                 ast_frfree(f);
 188                                                 break;
 189                                         }
 190                                 }
 191                         }
 192                         ast_frfree(f);
 193                 }
 194         }
 195         close(fds[1]);
 196
 197         if (pid > -1)
 198                 kill(pid, SIGKILL);
 199         if (!res && oreadformat)
 200                 ast_set_read_format(chan, oreadformat);
 201
 202         ast_module_user_remove(u);
 203
 204         return res;
 205 }
 206
 207 static int unload_module(void)
 208 {
 209         int res;
 210
 211         res = ast_unregister_application(app);
 212
 213         ast_module_user_hangup_all();
 214
 215         return res;
 216 }
 217
 218 static int load_module(void)
 219 {
 220         return ast_register_application(app, ices_exec, synopsis, descrip);
 221 }
 222
 223 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Encode and Stream via icecast and ices");