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         res = fork();
  69         if (res < 0)
  70                 ast_log(LOG_WARNING, "Fork failed\n");
  71         if (res)
  72                 return res;
  73         if (ast_opt_high_priority)
  74                 ast_set_priority(0);
  75         dup2(fd, STDIN_FILENO);
  76         for (x=STDERR_FILENO + 1;x<256;x++) {
  77                 if ((x != STDIN_FILENO) && (x != STDOUT_FILENO))
  78                         close(x);
  79         }
  80         /* Most commonly installed in /usr/local/bin */
  81         execl(ICES, "ices", filename, (char *)NULL);
  82         /* But many places has it in /usr/bin */
  83         execl(LOCAL_ICES, "ices", filename, (char *)NULL);
  84         /* As a last-ditch effort, try to use PATH */
  85         execlp("ices", "ices", filename, (char *)NULL);
  86         ast_log(LOG_WARNING, "Execute of ices failed\n");
  87         return -1;
  88 }
  89
  90 static int ices_exec(struct ast_channel *chan, void *data)
  91 {
  92         int res=0;
  93         struct ast_module_user *u;
  94         int fds[2];
  95         int ms = -1;
  96         int pid = -1;
  97         int flags;
  98         int oreadformat;
  99         struct timeval last;
 100         struct ast_frame *f;
 101         char filename[256]="";
 102         char *c;
 103
 104         if (ast_strlen_zero(data)) {
 105                 ast_log(LOG_WARNING, "ICES requires an argument (configfile.xml)\n");
 106                 return -1;
 107         }
 108
 109         u = ast_module_user_add(chan);
 110
 111         last = ast_tv(0, 0);
 112
 113         if (pipe(fds)) {
 114                 ast_log(LOG_WARNING, "Unable to create pipe\n");
 115                 ast_module_user_remove(u);
 116                 return -1;
 117         }
 118         flags = fcntl(fds[1], F_GETFL);
 119         fcntl(fds[1], F_SETFL, flags | O_NONBLOCK);
 120
 121         ast_stopstream(chan);
 122
 123         if (chan->_state != AST_STATE_UP)
 124                 res = ast_answer(chan);
 125
 126         if (res) {
 127                 close(fds[0]);
 128                 close(fds[1]);
 129                 ast_log(LOG_WARNING, "Answer failed!\n");
 130                 ast_module_user_remove(u);
 131                 return -1;
 132         }
 133
 134         oreadformat = chan->readformat;
 135         res = ast_set_read_format(chan, AST_FORMAT_SLINEAR);
 136         if (res < 0) {
 137                 close(fds[0]);
 138                 close(fds[1]);
 139                 ast_log(LOG_WARNING, "Unable to set write format to signed linear\n");
 140                 ast_module_user_remove(u);
 141                 return -1;
 142         }
 143         if (((char *)data)[0] == '/')
 144                 ast_copy_string(filename, (char *) data, sizeof(filename));
 145         else
 146                 snprintf(filename, sizeof(filename), "%s/%s", (char *)ast_config_AST_CONFIG_DIR, (char *)data);
 147         /* Placeholder for options */
 148         c = strchr(filename, '|');
 149         if (c)
 150                 *c = '\0';
 151         res = icesencode(filename, fds[0]);
 152         close(fds[0]);
 153         if (res >= 0) {
 154                 pid = res;
 155                 for (;;) {
 156                         /* Wait for audio, and stream */
 157                         ms = ast_waitfor(chan, -1);
 158                         if (ms < 0) {
 159                                 ast_log(LOG_DEBUG, "Hangup detected\n");
 160                                 res = -1;
 161                                 break;
 162                         }
 163                         f = ast_read(chan);
 164                         if (!f) {
 165                                 ast_log(LOG_DEBUG, "Null frame == hangup() detected\n");
 166                                 res = -1;
 167                                 break;
 168                         }
 169                         if (f->frametype == AST_FRAME_VOICE) {
 170                                 res = write(fds[1], f->data, f->datalen);
 171                                 if (res < 0) {
 172                                         if (errno != EAGAIN) {
 173                                                 ast_log(LOG_WARNING, "Write failed to pipe: %s\n", strerror(errno));
 174                                                 res = -1;
 175                                                 ast_frfree(f);
 176                                                 break;
 177                                         }
 178                                 }
 179                         }
 180                         ast_frfree(f);
 181                 }
 182         }
 183         close(fds[1]);
 184
 185         if (pid > -1)
 186                 kill(pid, SIGKILL);
 187         if (!res && oreadformat)
 188                 ast_set_read_format(chan, oreadformat);
 189
 190         ast_module_user_remove(u);
 191
 192         return res;
 193 }
 194
 195 static int unload_module(void)
 196 {
 197         int res;
 198
 199         res = ast_unregister_application(app);
 200
 201         ast_module_user_hangup_all();
 202
 203         return res;
 204 }
 205
 206 static int load_module(void)
 207 {
 208         return ast_register_application(app, ices_exec, synopsis, descrip);
 209 }
 210
 211 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Encode and Stream via icecast and ices");