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 path_BIN "/usr/bin/"
  52 #define path_LOCAL "/usr/local/bin/"
  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 contrib/asterisk-ices.xml). \n";
  62
  63 static int icesencode(char *filename, int fd)
  64 {
  65         int res;
  66         int x;
  67         sigset_t fullset, oldset;
  68
  69         sigfillset(&fullset);
  70         pthread_sigmask(SIG_BLOCK, &fullset, &oldset);
  71
  72         res = fork();
  73         if (res < 0)
  74                 ast_log(LOG_WARNING, "Fork failed\n");
  75         if (res) {
  76                 pthread_sigmask(SIG_SETMASK, &oldset, NULL);
  77                 return res;
  78         }
  79
  80         /* Stop ignoring PIPE */
  81         signal(SIGPIPE, SIG_DFL);
  82         pthread_sigmask(SIG_UNBLOCK, &fullset, NULL);
  83
  84         if (ast_opt_high_priority)
  85                 ast_set_priority(0);
  86         dup2(fd, STDIN_FILENO);
  87         for (x=STDERR_FILENO + 1;x<1024;x++) {
  88                 if ((x != STDIN_FILENO) && (x != STDOUT_FILENO))
  89                         close(x);
  90         }
  91
  92         /* Most commonly installed in /usr/local/bin
  93          * But many places has it in /usr/bin
  94          * As a last-ditch effort, try to use PATH
  95          */
  96         execl(path_LOCAL "ices2", "ices", filename, (char *)NULL);
  97         execl(path_BIN "ices2", "ices", filename, (char *)NULL);
  98         execlp("ices2", "ices", filename, (char *)NULL);
  99
 100         if (option_debug)
 101                 ast_log(LOG_DEBUG, "Couldn't find ices version 2, attempting to use ices version 1.");
 102
 103         execl(path_LOCAL "ices", "ices", filename, (char *)NULL);
 104         execl(path_BIN "ices", "ices", filename, (char *)NULL);
 105         execlp("ices", "ices", filename, (char *)NULL);
 106
 107         ast_log(LOG_WARNING, "Execute of ices failed, could not be found.\n");
 108         close(fd);
 109         _exit(0);
 110 }
 111
 112 static int ices_exec(struct ast_channel *chan, void *data)
 113 {
 114         int res=0;
 115         struct ast_module_user *u;
 116         int fds[2];
 117         int ms = -1;
 118         int pid = -1;
 119         int flags;
 120         int oreadformat;
 121         struct timeval last;
 122         struct ast_frame *f;
 123         char filename[256]="";
 124         char *c;
 125
 126         if (ast_strlen_zero(data)) {
 127                 ast_log(LOG_WARNING, "ICES requires an argument (configfile.xml)\n");
 128                 return -1;
 129         }
 130
 131         u = ast_module_user_add(chan);
 132
 133         last = ast_tv(0, 0);
 134
 135         if (pipe(fds)) {
 136                 ast_log(LOG_WARNING, "Unable to create pipe\n");
 137                 ast_module_user_remove(u);
 138                 return -1;
 139         }
 140         flags = fcntl(fds[1], F_GETFL);
 141         fcntl(fds[1], F_SETFL, flags | O_NONBLOCK);
 142
 143         ast_stopstream(chan);
 144
 145         if (chan->_state != AST_STATE_UP)
 146                 res = ast_answer(chan);
 147
 148         if (res) {
 149                 close(fds[0]);
 150                 close(fds[1]);
 151                 ast_log(LOG_WARNING, "Answer failed!\n");
 152                 ast_module_user_remove(u);
 153                 return -1;
 154         }
 155
 156         oreadformat = chan->readformat;
 157         res = ast_set_read_format(chan, AST_FORMAT_SLINEAR);
 158         if (res < 0) {
 159                 close(fds[0]);
 160                 close(fds[1]);
 161                 ast_log(LOG_WARNING, "Unable to set write format to signed linear\n");
 162                 ast_module_user_remove(u);
 163                 return -1;
 164         }
 165         if (((char *)data)[0] == '/')
 166                 ast_copy_string(filename, (char *) data, sizeof(filename));
 167         else
 168                 snprintf(filename, sizeof(filename), "%s/%s", (char *)ast_config_AST_CONFIG_DIR, (char *)data);
 169         /* Placeholder for options */
 170         c = strchr(filename, '|');
 171         if (c)
 172                 *c = '\0';
 173         res = icesencode(filename, fds[0]);
 174         if (res >= 0) {
 175                 pid = res;
 176                 for (;;) {
 177                         /* Wait for audio, and stream */
 178                         ms = ast_waitfor(chan, -1);
 179                         if (ms < 0) {
 180                                 ast_log(LOG_DEBUG, "Hangup detected\n");
 181                                 res = -1;
 182                                 break;
 183                         }
 184                         f = ast_read(chan);
 185                         if (!f) {
 186                                 ast_log(LOG_DEBUG, "Null frame == hangup() detected\n");
 187                                 res = -1;
 188                                 break;
 189                         }
 190                         if (f->frametype == AST_FRAME_VOICE) {
 191                                 res = write(fds[1], f->data, f->datalen);
 192                                 if (res < 0) {
 193                                         if (errno != EAGAIN) {
 194                                                 ast_log(LOG_WARNING, "Write failed to pipe: %s\n", strerror(errno));
 195                                                 res = -1;
 196                                                 ast_frfree(f);
 197                                                 break;
 198                                         }
 199                                 }
 200                         }
 201                         ast_frfree(f);
 202                 }
 203         }
 204         close(fds[0]);
 205         close(fds[1]);
 206
 207         if (pid > -1)
 208                 kill(pid, SIGKILL);
 209         if (!res && oreadformat)
 210                 ast_set_read_format(chan, oreadformat);
 211
 212         ast_module_user_remove(u);
 213
 214         return res;
 215 }
 216
 217 static int unload_module(void)
 218 {
 219         int res;
 220
 221         res = ast_unregister_application(app);
 222
 223         ast_module_user_hangup_all();
 224
 225         return res;
 226 }
 227
 228 static int load_module(void)
 229 {
 230         return ast_register_application(app, ices_exec, synopsis, descrip);
 231 }
 232
 233 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Encode and Stream via icecast and ices");