Tue Sep 30 01:19:29 2008

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  * \author Mark Spencer <markster@digium.com>
00024  * 
00025  * \ingroup applications
00026  */
00027  
00028 #include "asterisk.h"
00029 
00030 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 48375 $")
00031 
00032 #include <string.h>
00033 #include <stdio.h>
00034 #include <signal.h>
00035 #include <stdlib.h>
00036 #include <unistd.h>
00037 #include <fcntl.h>
00038 #include <sys/time.h>
00039 
00040 #include "asterisk/lock.h"
00041 #include "asterisk/file.h"
00042 #include "asterisk/logger.h"
00043 #include "asterisk/channel.h"
00044 #include "asterisk/frame.h"
00045 #include "asterisk/pbx.h"
00046 #include "asterisk/module.h"
00047 #include "asterisk/translate.h"
00048 #include "asterisk/options.h"
00049 
00050 #define LOCAL_MPG_123 "/usr/local/bin/mpg123"
00051 #define MPG_123 "/usr/bin/mpg123"
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 
00063 static int mp3play(char *filename, int fd)
00064 {
00065    int res;
00066    int x;
00067    sigset_t fullset, oldset;
00068 
00069    sigfillset(&fullset);
00070    pthread_sigmask(SIG_BLOCK, &fullset, &oldset);
00071 
00072    res = fork();
00073    if (res < 0) 
00074       ast_log(LOG_WARNING, "Fork failed\n");
00075    if (res) {
00076       pthread_sigmask(SIG_SETMASK, &oldset, NULL);
00077       return res;
00078    }
00079    if (ast_opt_high_priority)
00080       ast_set_priority(0);
00081    signal(SIGPIPE, SIG_DFL);
00082    pthread_sigmask(SIG_UNBLOCK, &fullset, NULL);
00083 
00084    dup2(fd, STDOUT_FILENO);
00085    for (x=STDERR_FILENO + 1;x<256;x++) {
00086       if (x != STDOUT_FILENO)
00087          close(x);
00088    }
00089    /* Execute mpg123, but buffer if it's a net connection */
00090    if (!strncasecmp(filename, "http://", 7)) {
00091       /* Most commonly installed in /usr/local/bin */
00092        execl(LOCAL_MPG_123, "mpg123", "-q", "-s", "-b", "1024", "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
00093       /* But many places has it in /usr/bin */
00094        execl(MPG_123, "mpg123", "-q", "-s", "-b", "1024","-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
00095       /* As a last-ditch effort, try to use PATH */
00096        execlp("mpg123", "mpg123", "-q", "-s", "-b", "1024",  "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
00097    }
00098    else {
00099       /* Most commonly installed in /usr/local/bin */
00100        execl(MPG_123, "mpg123", "-q", "-s", "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
00101       /* But many places has it in /usr/bin */
00102        execl(LOCAL_MPG_123, "mpg123", "-q", "-s", "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
00103       /* As a last-ditch effort, try to use PATH */
00104        execlp("mpg123", "mpg123", "-q", "-s", "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
00105    }
00106    ast_log(LOG_WARNING, "Execute of mpg123 failed\n");
00107    _exit(0);
00108 }
00109 
00110 static int timed_read(int fd, void *data, int datalen, int timeout)
00111 {
00112    int res;
00113    struct pollfd fds[1];
00114    fds[0].fd = fd;
00115    fds[0].events = POLLIN;
00116    res = poll(fds, 1, timeout);
00117    if (res < 1) {
00118       ast_log(LOG_NOTICE, "Poll timed out/errored out with %d\n", res);
00119       return -1;
00120    }
00121    return read(fd, data, datalen);
00122    
00123 }
00124 
00125 static int mp3_exec(struct ast_channel *chan, void *data)
00126 {
00127    int res=0;
00128    struct ast_module_user *u;
00129    int fds[2];
00130    int ms = -1;
00131    int pid = -1;
00132    int owriteformat;
00133    int timeout = 2000;
00134    struct timeval next;
00135    struct ast_frame *f;
00136    struct myframe {
00137       struct ast_frame f;
00138       char offset[AST_FRIENDLY_OFFSET];
00139       short frdata[160];
00140    } myf;
00141    
00142    if (ast_strlen_zero(data)) {
00143       ast_log(LOG_WARNING, "MP3 Playback requires an argument (filename)\n");
00144       return -1;
00145    }
00146 
00147    u = ast_module_user_add(chan);
00148 
00149    if (pipe(fds)) {
00150       ast_log(LOG_WARNING, "Unable to create pipe\n");
00151       ast_module_user_remove(u);
00152       return -1;
00153    }
00154    
00155    ast_stopstream(chan);
00156 
00157    owriteformat = chan->writeformat;
00158    res = ast_set_write_format(chan, AST_FORMAT_SLINEAR);
00159    if (res < 0) {
00160       ast_log(LOG_WARNING, "Unable to set write format to signed linear\n");
00161       ast_module_user_remove(u);
00162       return -1;
00163    }
00164    
00165    res = mp3play((char *)data, fds[1]);
00166    if (!strncasecmp((char *)data, "http://", 7)) {
00167       timeout = 10000;
00168    }
00169    /* Wait 1000 ms first */
00170    next = ast_tvnow();
00171    next.tv_sec += 1;
00172    if (res >= 0) {
00173       pid = res;
00174       /* Order is important -- there's almost always going to be mp3...  we want to prioritize the
00175          user */
00176       for (;;) {
00177          ms = ast_tvdiff_ms(next, ast_tvnow());
00178          if (ms <= 0) {
00179             res = timed_read(fds[0], myf.frdata, sizeof(myf.frdata), timeout);
00180             if (res > 0) {
00181                myf.f.frametype = AST_FRAME_VOICE;
00182                myf.f.subclass = AST_FORMAT_SLINEAR;
00183                myf.f.datalen = res;
00184                myf.f.samples = res / 2;
00185                myf.f.mallocd = 0;
00186                myf.f.offset = AST_FRIENDLY_OFFSET;
00187                myf.f.src = __PRETTY_FUNCTION__;
00188                myf.f.delivery.tv_sec = 0;
00189                myf.f.delivery.tv_usec = 0;
00190                myf.f.data = myf.frdata;
00191                if (ast_write(chan, &myf.f) < 0) {
00192                   res = -1;
00193                   break;
00194                }
00195             } else {
00196                ast_log(LOG_DEBUG, "No more mp3\n");
00197                res = 0;
00198                break;
00199             }
00200             next = ast_tvadd(next, ast_samp2tv(myf.f.samples, 8000));
00201          } else {
00202             ms = ast_waitfor(chan, ms);
00203             if (ms < 0) {
00204                ast_log(LOG_DEBUG, "Hangup detected\n");
00205                res = -1;
00206                break;
00207             }
00208             if (ms) {
00209                f = ast_read(chan);
00210                if (!f) {
00211                   ast_log(LOG_DEBUG, "Null frame == hangup() detected\n");
00212                   res = -1;
00213                   break;
00214                }
00215                if (f->frametype == AST_FRAME_DTMF) {
00216                   ast_log(LOG_DEBUG, "User pressed a key\n");
00217                   ast_frfree(f);
00218                   res = 0;
00219                   break;
00220                }
00221                ast_frfree(f);
00222             } 
00223          }
00224       }
00225    }
00226    close(fds[0]);
00227    close(fds[1]);
00228    
00229    if (pid > -1)
00230       kill(pid, SIGKILL);
00231    if (!res && owriteformat)
00232       ast_set_write_format(chan, owriteformat);
00233 
00234    ast_module_user_remove(u);
00235    
00236    return res;
00237 }
00238 
00239 static int unload_module(void)
00240 {
00241    int res;
00242 
00243    res = ast_unregister_application(app);
00244 
00245    ast_module_user_hangup_all();
00246    
00247    return res;
00248 }
00249 
00250 static int load_module(void)
00251 {
00252    return ast_register_application(app, mp3_exec, synopsis, descrip);
00253 }
00254 
00255 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Silly MP3 Application");

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