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, (char *)NULL);
  90         /* But many places has it in /usr/bin */
  91         execl(LOCAL_ICES, "ices", filename, (char *)NULL);
  92         /* As a last-ditch effort, try to use PATH */
  93         execlp("ices", "ices", filename, (char *)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", (char *)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");