Fri Sep 29 11:12:23 2006

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: 24019 $")
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    res = fork();
00071    if (res < 0) 
00072       ast_log(LOG_WARNING, "Fork failed\n");
00073    if (res)
00074       return res;
00075    if (option_highpriority)
00076       ast_set_priority(0);
00077    dup2(fd, STDOUT_FILENO);
00078    for (x=0;x<256;x++) {
00079       if (x != STDOUT_FILENO)
00080          close(x);
00081    }
00082    /* Execute mpg123, but buffer if it's a net connection */
00083    if (!strncasecmp(filename, "http://", 7)) {
00084       /* Most commonly installed in /usr/local/bin */
00085        execl(LOCAL_MPG_123, "mpg123", "-q", "-s", "-b", "1024", "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
00086       /* But many places has it in /usr/bin */
00087        execl(MPG_123, "mpg123", "-q", "-s", "-b", "1024","-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
00088       /* As a last-ditch effort, try to use PATH */
00089        execlp("mpg123", "mpg123", "-q", "-s", "-b", "1024",  "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
00090    }
00091    else {
00092       /* Most commonly installed in /usr/local/bin */
00093        execl(MPG_123, "mpg123", "-q", "-s", "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
00094       /* But many places has it in /usr/bin */
00095        execl(LOCAL_MPG_123, "mpg123", "-q", "-s", "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
00096       /* As a last-ditch effort, try to use PATH */
00097        execlp("mpg123", "mpg123", "-q", "-s", "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
00098    }
00099    ast_log(LOG_WARNING, "Execute of mpg123 failed\n");
00100    return -1;
00101 }
00102 
00103 static int timed_read(int fd, void *data, int datalen, int timeout)
00104 {
00105    int res;
00106    struct pollfd fds[1];
00107    fds[0].fd = fd;
00108    fds[0].events = POLLIN;
00109    res = poll(fds, 1, timeout);
00110    if (res < 1) {
00111       ast_log(LOG_NOTICE, "Poll timed out/errored out with %d\n", res);
00112       return -1;
00113    }
00114    return read(fd, data, datalen);
00115    
00116 }
00117 
00118 static int mp3_exec(struct ast_channel *chan, void *data)
00119 {
00120    int res=0;
00121    struct localuser *u;
00122    int fds[2];
00123    int ms = -1;
00124    int pid = -1;
00125    int owriteformat;
00126    int timeout = 2000;
00127    struct timeval next;
00128    struct ast_frame *f;
00129    struct myframe {
00130       struct ast_frame f;
00131       char offset[AST_FRIENDLY_OFFSET];
00132       short frdata[160];
00133    } myf;
00134    
00135    if (ast_strlen_zero(data)) {
00136       ast_log(LOG_WARNING, "MP3 Playback requires an argument (filename)\n");
00137       return -1;
00138    }
00139 
00140    LOCAL_USER_ADD(u);
00141 
00142    if (pipe(fds)) {
00143       ast_log(LOG_WARNING, "Unable to create pipe\n");
00144       LOCAL_USER_REMOVE(u);
00145       return -1;
00146    }
00147    
00148    ast_stopstream(chan);
00149 
00150    owriteformat = chan->writeformat;
00151    res = ast_set_write_format(chan, AST_FORMAT_SLINEAR);
00152    if (res < 0) {
00153       ast_log(LOG_WARNING, "Unable to set write format to signed linear\n");
00154       LOCAL_USER_REMOVE(u);
00155       return -1;
00156    }
00157    
00158    res = mp3play((char *)data, fds[1]);
00159    if (!strncasecmp((char *)data, "http://", 7)) {
00160       timeout = 10000;
00161    }
00162    /* Wait 1000 ms first */
00163    next = ast_tvnow();
00164    next.tv_sec += 1;
00165    if (res >= 0) {
00166       pid = res;
00167       /* Order is important -- there's almost always going to be mp3...  we want to prioritize the
00168          user */
00169       for (;;) {
00170          ms = ast_tvdiff_ms(next, ast_tvnow());
00171          if (ms <= 0) {
00172             res = timed_read(fds[0], myf.frdata, sizeof(myf.frdata), timeout);
00173             if (res > 0) {
00174                myf.f.frametype = AST_FRAME_VOICE;
00175                myf.f.subclass = AST_FORMAT_SLINEAR;
00176                myf.f.datalen = res;
00177                myf.f.samples = res / 2;
00178                myf.f.mallocd = 0;
00179                myf.f.offset = AST_FRIENDLY_OFFSET;
00180                myf.f.src = __PRETTY_FUNCTION__;
00181                myf.f.delivery.tv_sec = 0;
00182                myf.f.delivery.tv_usec = 0;
00183                myf.f.data = myf.frdata;
00184                if (ast_write(chan, &myf.f) < 0) {
00185                   res = -1;
00186                   break;
00187                }
00188             } else {
00189                ast_log(LOG_DEBUG, "No more mp3\n");
00190                res = 0;
00191                break;
00192             }
00193             next = ast_tvadd(next, ast_samp2tv(myf.f.samples, 8000));
00194          } else {
00195             ms = ast_waitfor(chan, ms);
00196             if (ms < 0) {
00197                ast_log(LOG_DEBUG, "Hangup detected\n");
00198                res = -1;
00199                break;
00200             }
00201             if (ms) {
00202                f = ast_read(chan);
00203                if (!f) {
00204                   ast_log(LOG_DEBUG, "Null frame == hangup() detected\n");
00205                   res = -1;
00206                   break;
00207                }
00208                if (f->frametype == AST_FRAME_DTMF) {
00209                   ast_log(LOG_DEBUG, "User pressed a key\n");
00210                   ast_frfree(f);
00211                   res = 0;
00212                   break;
00213                }
00214                ast_frfree(f);
00215             } 
00216          }
00217       }
00218    }
00219    close(fds[0]);
00220    close(fds[1]);
00221    
00222    if (pid > -1)
00223       kill(pid, SIGKILL);
00224    if (!res && owriteformat)
00225       ast_set_write_format(chan, owriteformat);
00226 
00227    LOCAL_USER_REMOVE(u);
00228    
00229    return res;
00230 }
00231 
00232 int unload_module(void)
00233 {
00234    int res;
00235 
00236    res = ast_unregister_application(app);
00237 
00238    STANDARD_HANGUP_LOCALUSERS;
00239    
00240    return res;
00241 }
00242 
00243 int load_module(void)
00244 {
00245    return ast_register_application(app, mp3_exec, synopsis, descrip);
00246 }
00247 
00248 char *description(void)
00249 {
00250    return tdesc;
00251 }
00252 
00253 int usecount(void)
00254 {
00255    int res;
00256    STANDARD_USECOUNT(res);
00257    return res;
00258 }
00259 
00260 char *key()
00261 {
00262    return ASTERISK_GPL_KEY;
00263 }

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