Wed Oct 28 15:47:48 2009

Asterisk developer's documentation


app_mp3.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 1999 - 2005, Digium, Inc.
00005  *
00006  * Mark Spencer <markster@digium.com>
00007  *
00008  * See http://www.asterisk.org for more information about
00009  * the Asterisk project. Please do not directly contact
00010  * any of the maintainers of this project for assistance;
00011  * the project provides a web site, mailing lists and IRC
00012  * channels for your use.
00013  *
00014  * This program is free software, distributed under the terms of
00015  * the GNU General Public License Version 2. See the LICENSE file
00016  * at the top of the source tree.
00017  */
00018 
00019 /*! \file
00020  *
00021  * \brief Silly application to play an MP3 file -- uses mpg123
00022  * 
00023  * \ingroup applications
00024  */
00025  
00026 #include <string.h>
00027 #include <stdio.h>
00028 #include <signal.h>
00029 #include <stdlib.h>
00030 #include <unistd.h>
00031 #include <fcntl.h>
00032 #include <sys/time.h>
00033 
00034 #include "asterisk.h"
00035 
00036 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 48374 $")
00037 
00038 #include "asterisk/lock.h"
00039 #include "asterisk/file.h"
00040 #include "asterisk/logger.h"
00041 #include "asterisk/channel.h"
00042 #include "asterisk/frame.h"
00043 #include "asterisk/pbx.h"
00044 #include "asterisk/module.h"
00045 #include "asterisk/translate.h"
00046 #include "asterisk/options.h"
00047 
00048 #define LOCAL_MPG_123 "/usr/local/bin/mpg123"
00049 #define MPG_123 "/usr/bin/mpg123"
00050 
00051 static char *tdesc = "Silly MP3 Application";
00052 
00053 static char *app = "MP3Player";
00054 
00055 static char *synopsis = "Play an MP3 file or stream";
00056 
00057 static char *descrip = 
00058 "  MP3Player(location) Executes mpg123 to play the given location,\n"
00059 "which typically would be a filename or a URL. User can exit by pressing\n"
00060 "any key on the dialpad, or by hanging up."; 
00061 
00062 STANDARD_LOCAL_USER;
00063 
00064 LOCAL_USER_DECL;
00065 
00066 static int mp3play(char *filename, int fd)
00067 {
00068    int res;
00069    int x;
00070    sigset_t fullset, oldset;
00071 
00072    sigfillset(&fullset);
00073    pthread_sigmask(SIG_BLOCK, &fullset, &oldset);
00074 
00075    res = fork();
00076    if (res < 0) 
00077       ast_log(LOG_WARNING, "Fork failed\n");
00078    if (res) {
00079       pthread_sigmask(SIG_SETMASK, &oldset, NULL);
00080       return res;
00081    }
00082    if (option_highpriority)
00083       ast_set_priority(0);
00084    signal(SIGPIPE, SIG_DFL);
00085    pthread_sigmask(SIG_UNBLOCK, &fullset, NULL);
00086 
00087    dup2(fd, STDOUT_FILENO);
00088    for (x=STDERR_FILENO + 1;x<256;x++) {
00089       if (x != STDOUT_FILENO)
00090          close(x);
00091    }
00092    /* Execute mpg123, but buffer if it's a net connection */
00093    if (!strncasecmp(filename, "http://", 7)) {
00094       /* Most commonly installed in /usr/local/bin */
00095        execl(LOCAL_MPG_123, "mpg123", "-q", "-s", "-b", "1024", "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
00096       /* But many places has it in /usr/bin */
00097        execl(MPG_123, "mpg123", "-q", "-s", "-b", "1024","-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
00098       /* As a last-ditch effort, try to use PATH */
00099        execlp("mpg123", "mpg123", "-q", "-s", "-b", "1024",  "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
00100    }
00101    else {
00102       /* Most commonly installed in /usr/local/bin */
00103        execl(MPG_123, "mpg123", "-q", "-s", "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
00104       /* But many places has it in /usr/bin */
00105        execl(LOCAL_MPG_123, "mpg123", "-q", "-s", "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
00106       /* As a last-ditch effort, try to use PATH */
00107        execlp("mpg123", "mpg123", "-q", "-s", "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
00108    }
00109    ast_log(LOG_WARNING, "Execute of mpg123 failed\n");
00110    _exit(0);
00111 }
00112 
00113 static int timed_read(int fd, void *data, int datalen, int timeout)
00114 {
00115    int res;
00116    struct pollfd fds[1];
00117    fds[0].fd = fd;
00118    fds[0].events = POLLIN;
00119    res = poll(fds, 1, timeout);
00120    if (res < 1) {
00121       ast_log(LOG_NOTICE, "Poll timed out/errored out with %d\n", res);
00122       return -1;
00123    }
00124    return read(fd, data, datalen);
00125    
00126 }
00127 
00128 static int mp3_exec(struct ast_channel *chan, void *data)
00129 {
00130    int res=0;
00131    struct localuser *u;
00132    int fds[2];
00133    int ms = -1;
00134    int pid = -1;
00135    int owriteformat;
00136    int timeout = 2000;
00137    struct timeval next;
00138    struct ast_frame *f;
00139    struct myframe {
00140       struct ast_frame f;
00141       char offset[AST_FRIENDLY_OFFSET];
00142       short frdata[160];
00143    } myf;
00144    
00145    if (ast_strlen_zero(data)) {
00146       ast_log(LOG_WARNING, "MP3 Playback requires an argument (filename)\n");
00147       return -1;
00148    }
00149 
00150    LOCAL_USER_ADD(u);
00151 
00152    if (pipe(fds)) {
00153       ast_log(LOG_WARNING, "Unable to create pipe\n");
00154       LOCAL_USER_REMOVE(u);
00155       return -1;
00156    }
00157    
00158    ast_stopstream(chan);
00159 
00160    owriteformat = chan->writeformat;
00161    res = ast_set_write_format(chan, AST_FORMAT_SLINEAR);
00162    if (res < 0) {
00163       ast_log(LOG_WARNING, "Unable to set write format to signed linear\n");
00164       LOCAL_USER_REMOVE(u);
00165       return -1;
00166    }
00167    
00168    res = mp3play((char *)data, fds[1]);
00169    if (!strncasecmp((char *)data, "http://", 7)) {
00170       timeout = 10000;
00171    }
00172    /* Wait 1000 ms first */
00173    next = ast_tvnow();
00174    next.tv_sec += 1;
00175    if (res >= 0) {
00176       pid = res;
00177       /* Order is important -- there's almost always going to be mp3...  we want to prioritize the
00178          user */
00179       for (;;) {
00180          ms = ast_tvdiff_ms(next, ast_tvnow());
00181          if (ms <= 0) {
00182             res = timed_read(fds[0], myf.frdata, sizeof(myf.frdata), timeout);
00183             if (res > 0) {
00184                myf.f.frametype = AST_FRAME_VOICE;
00185                myf.f.subclass = AST_FORMAT_SLINEAR;
00186                myf.f.datalen = res;
00187                myf.f.samples = res / 2;
00188                myf.f.mallocd = 0;
00189                myf.f.offset = AST_FRIENDLY_OFFSET;
00190                myf.f.src = __PRETTY_FUNCTION__;
00191                myf.f.delivery.tv_sec = 0;
00192                myf.f.delivery.tv_usec = 0;
00193                myf.f.data = myf.frdata;
00194                if (ast_write(chan, &myf.f) < 0) {
00195                   res = -1;
00196                   break;
00197                }
00198             } else {
00199                ast_log(LOG_DEBUG, "No more mp3\n");
00200                res = 0;
00201                break;
00202             }
00203             next = ast_tvadd(next, ast_samp2tv(myf.f.samples, 8000));
00204          } else {
00205             ms = ast_waitfor(chan, ms);
00206             if (ms < 0) {
00207                ast_log(LOG_DEBUG, "Hangup detected\n");
00208                res = -1;
00209                break;
00210             }
00211             if (ms) {
00212                f = ast_read(chan);
00213                if (!f) {
00214                   ast_log(LOG_DEBUG, "Null frame == hangup() detected\n");
00215                   res = -1;
00216                   break;
00217                }
00218                if (f->frametype == AST_FRAME_DTMF) {
00219                   ast_log(LOG_DEBUG, "User pressed a key\n");
00220                   ast_frfree(f);
00221                   res = 0;
00222                   break;
00223                }
00224                ast_frfree(f);
00225             } 
00226          }
00227       }
00228    }
00229    close(fds[0]);
00230    close(fds[1]);
00231    
00232    if (pid > -1)
00233       kill(pid, SIGKILL);
00234    if (!res && owriteformat)
00235       ast_set_write_format(chan, owriteformat);
00236 
00237    LOCAL_USER_REMOVE(u);
00238    
00239    return res;
00240 }
00241 
00242 int unload_module(void)
00243 {
00244    int res;
00245 
00246    res = ast_unregister_application(app);
00247 
00248    STANDARD_HANGUP_LOCALUSERS;
00249    
00250    return res;
00251 }
00252 
00253 int load_module(void)
00254 {
00255    return ast_register_application(app, mp3_exec, synopsis, descrip);
00256 }
00257 
00258 char *description(void)
00259 {
00260    return tdesc;
00261 }
00262 
00263 int usecount(void)
00264 {
00265    int res;
00266    STANDARD_USECOUNT(res);
00267    return res;
00268 }
00269 
00270 char *key()
00271 {
00272    return ASTERISK_GPL_KEY;
00273 }

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