apps/app_mp3.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 Silly application to play an MP3 file -- uses mpg123
  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
  40 #include "asterisk/lock.h"
  41 #include "asterisk/file.h"
  42 #include "asterisk/logger.h"
  43 #include "asterisk/channel.h"
  44 #include "asterisk/frame.h"
  45 #include "asterisk/pbx.h"
  46 #include "asterisk/module.h"
  47 #include "asterisk/translate.h"
  48 #include "asterisk/options.h"
  49
  50 #define LOCAL_MPG_123 "/usr/local/bin/mpg123"
  51 #define MPG_123 "/usr/bin/mpg123"
  52
  53 static char *app = "MP3Player";
  54
  55 static char *synopsis = "Play an MP3 file or stream";
  56
  57 static char *descrip =
  58 "  MP3Player(location) Executes mpg123 to play the given location,\n"
  59 "which typically would be a filename or a URL. User can exit by pressing\n"
  60 "any key on the dialpad, or by hanging up.";
  61
  62
  63 static int mp3play(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         if (ast_opt_high_priority)
  80                 ast_set_priority(0);
  81         signal(SIGPIPE, SIG_DFL);
  82         pthread_sigmask(SIG_UNBLOCK, &fullset, NULL);
  83
  84         dup2(fd, STDOUT_FILENO);
  85         for (x=STDERR_FILENO + 1;x<256;x++) {
  86                 if (x != STDOUT_FILENO)
  87                         close(x);
  88         }
  89         /* Execute mpg123, but buffer if it's a net connection */
  90         if (!strncasecmp(filename, "http://", 7)) {
  91                 /* Most commonly installed in /usr/local/bin */
  92             execl(LOCAL_MPG_123, "mpg123", "-q", "-s", "-b", "1024", "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
  93                 /* But many places has it in /usr/bin */
  94             execl(MPG_123, "mpg123", "-q", "-s", "-b", "1024","-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
  95                 /* As a last-ditch effort, try to use PATH */
  96             execlp("mpg123", "mpg123", "-q", "-s", "-b", "1024",  "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
  97         }
  98         else {
  99                 /* Most commonly installed in /usr/local/bin */
 100             execl(MPG_123, "mpg123", "-q", "-s", "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
 101                 /* But many places has it in /usr/bin */
 102             execl(LOCAL_MPG_123, "mpg123", "-q", "-s", "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
 103                 /* As a last-ditch effort, try to use PATH */
 104             execlp("mpg123", "mpg123", "-q", "-s", "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
 105         }
 106         ast_log(LOG_WARNING, "Execute of mpg123 failed\n");
 107         _exit(0);
 108 }
 109
 110 static int timed_read(int fd, void *data, int datalen, int timeout)
 111 {
 112         int res;
 113         struct pollfd fds[1];
 114         fds[0].fd = fd;
 115         fds[0].events = POLLIN;
 116         res = poll(fds, 1, timeout);
 117         if (res < 1) {
 118                 ast_log(LOG_NOTICE, "Poll timed out/errored out with %d\n", res);
 119                 return -1;
 120         }
 121         return read(fd, data, datalen);
 122
 123 }
 124
 125 static int mp3_exec(struct ast_channel *chan, void *data)
 126 {
 127         int res=0;
 128         struct ast_module_user *u;
 129         int fds[2];
 130         int ms = -1;
 131         int pid = -1;
 132         int owriteformat;
 133         int timeout = 2000;
 134         struct timeval next;
 135         struct ast_frame *f;
 136         struct myframe {
 137                 struct ast_frame f;
 138                 char offset[AST_FRIENDLY_OFFSET];
 139                 short frdata[160];
 140         } myf;
 141
 142         if (ast_strlen_zero(data)) {
 143                 ast_log(LOG_WARNING, "MP3 Playback requires an argument (filename)\n");
 144                 return -1;
 145         }
 146
 147         u = ast_module_user_add(chan);
 148
 149         if (pipe(fds)) {
 150                 ast_log(LOG_WARNING, "Unable to create pipe\n");
 151                 ast_module_user_remove(u);
 152                 return -1;
 153         }
 154
 155         ast_stopstream(chan);
 156
 157         owriteformat = chan->writeformat;
 158         res = ast_set_write_format(chan, AST_FORMAT_SLINEAR);
 159         if (res < 0) {
 160                 ast_log(LOG_WARNING, "Unable to set write format to signed linear\n");
 161                 ast_module_user_remove(u);
 162                 return -1;
 163         }
 164
 165         res = mp3play((char *)data, fds[1]);
 166         if (!strncasecmp((char *)data, "http://", 7)) {
 167                 timeout = 10000;
 168         }
 169         /* Wait 1000 ms first */
 170         next = ast_tvnow();
 171         next.tv_sec += 1;
 172         if (res >= 0) {
 173                 pid = res;
 174                 /* Order is important -- there's almost always going to be mp3...  we want to prioritize the
 175                    user */
 176                 for (;;) {
 177                         ms = ast_tvdiff_ms(next, ast_tvnow());
 178                         if (ms <= 0) {
 179                                 res = timed_read(fds[0], myf.frdata, sizeof(myf.frdata), timeout);
 180                                 if (res > 0) {
 181                                         myf.f.frametype = AST_FRAME_VOICE;
 182                                         myf.f.subclass = AST_FORMAT_SLINEAR;
 183                                         myf.f.datalen = res;
 184                                         myf.f.samples = res / 2;
 185                                         myf.f.mallocd = 0;
 186                                         myf.f.offset = AST_FRIENDLY_OFFSET;
 187                                         myf.f.src = __PRETTY_FUNCTION__;
 188                                         myf.f.delivery.tv_sec = 0;
 189                                         myf.f.delivery.tv_usec = 0;
 190                                         myf.f.data = myf.frdata;
 191                                         if (ast_write(chan, &myf.f) < 0) {
 192                                                 res = -1;
 193                                                 break;
 194                                         }
 195                                 } else {
 196                                         ast_log(LOG_DEBUG, "No more mp3\n");
 197                                         res = 0;
 198                                         break;
 199                                 }
 200                                 next = ast_tvadd(next, ast_samp2tv(myf.f.samples, 8000));
 201                         } else {
 202                                 ms = ast_waitfor(chan, ms);
 203                                 if (ms < 0) {
 204                                         ast_log(LOG_DEBUG, "Hangup detected\n");
 205                                         res = -1;
 206                                         break;
 207                                 }
 208                                 if (ms) {
 209                                         f = ast_read(chan);
 210                                         if (!f) {
 211                                                 ast_log(LOG_DEBUG, "Null frame == hangup() detected\n");
 212                                                 res = -1;
 213                                                 break;
 214                                         }
 215                                         if (f->frametype == AST_FRAME_DTMF) {
 216                                                 ast_log(LOG_DEBUG, "User pressed a key\n");
 217                                                 ast_frfree(f);
 218                                                 res = 0;
 219                                                 break;
 220                                         }
 221                                         ast_frfree(f);
 222                                 }
 223                         }
 224                 }
 225         }
 226         close(fds[0]);
 227         close(fds[1]);
 228
 229         if (pid > -1)
 230                 kill(pid, SIGKILL);
 231         if (!res && owriteformat)
 232                 ast_set_write_format(chan, owriteformat);
 233
 234         ast_module_user_remove(u);
 235
 236         return res;
 237 }
 238
 239 static int unload_module(void)
 240 {
 241         int res;
 242
 243         res = ast_unregister_application(app);
 244
 245         ast_module_user_hangup_all();
 246
 247         return res;
 248 }
 249
 250 static int load_module(void)
 251 {
 252         return ast_register_application(app, mp3_exec, synopsis, descrip);
 253 }
 254
 255 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Silly MP3 Application");