Thu Oct 8 21:57:18 2009

Asterisk developer's documentation


app_nbscat.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 NBScat file -- uses nbscat8k
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 #include <sys/socket.h>
00040 
00041 #include "asterisk/lock.h"
00042 #include "asterisk/file.h"
00043 #include "asterisk/logger.h"
00044 #include "asterisk/channel.h"
00045 #include "asterisk/frame.h"
00046 #include "asterisk/pbx.h"
00047 #include "asterisk/module.h"
00048 #include "asterisk/translate.h"
00049 #include "asterisk/options.h"
00050 
00051 #define LOCAL_NBSCAT "/usr/local/bin/nbscat8k"
00052 #define NBSCAT "/usr/bin/nbscat8k"
00053 
00054 #ifndef AF_LOCAL
00055 #define AF_LOCAL AF_UNIX
00056 #endif
00057 
00058 static char *app = "NBScat";
00059 
00060 static char *synopsis = "Play an NBS local stream";
00061 
00062 static char *descrip = 
00063 "  NBScat: Executes nbscat to listen to the local NBS stream.\n"
00064 "User can exit by pressing any key\n.";
00065 
00066 
00067 static int NBScatplay(int fd)
00068 {
00069    int res;
00070    int x;
00071    sigset_t fullset, oldset;
00072 
00073    sigfillset(&fullset);
00074    pthread_sigmask(SIG_BLOCK, &fullset, &oldset);
00075 
00076    res = fork();
00077    if (res < 0) 
00078       ast_log(LOG_WARNING, "Fork failed\n");
00079    if (res) {
00080       pthread_sigmask(SIG_SETMASK, &oldset, NULL);
00081       return res;
00082    }
00083    signal(SIGPIPE, SIG_DFL);
00084    pthread_sigmask(SIG_UNBLOCK, &fullset, NULL);
00085 
00086    if (ast_opt_high_priority)
00087       ast_set_priority(0);
00088 
00089    dup2(fd, STDOUT_FILENO);
00090    for (x = STDERR_FILENO + 1; x < 1024; x++) {
00091       if (x != STDOUT_FILENO)
00092          close(x);
00093    }
00094    /* Most commonly installed in /usr/local/bin */
00095    execl(NBSCAT, "nbscat8k", "-d", (char *)NULL);
00096    execl(LOCAL_NBSCAT, "nbscat8k", "-d", (char *)NULL);
00097    ast_log(LOG_WARNING, "Execute of nbscat8k failed\n");
00098    _exit(0);
00099 }
00100 
00101 static int timed_read(int fd, void *data, int datalen)
00102 {
00103    int res;
00104    struct pollfd fds[1];
00105    fds[0].fd = fd;
00106    fds[0].events = POLLIN;
00107    res = poll(fds, 1, 2000);
00108    if (res < 1) {
00109       ast_log(LOG_NOTICE, "Selected timed out/errored out with %d\n", res);
00110       return -1;
00111    }
00112    return read(fd, data, datalen);
00113    
00114 }
00115 
00116 static int NBScat_exec(struct ast_channel *chan, void *data)
00117 {
00118    int res=0;
00119    struct ast_module_user *u;
00120    int fds[2];
00121    int ms = -1;
00122    int pid = -1;
00123    int owriteformat;
00124    struct timeval next;
00125    struct ast_frame *f;
00126    struct myframe {
00127       struct ast_frame f;
00128       char offset[AST_FRIENDLY_OFFSET];
00129       short frdata[160];
00130    } myf;
00131    
00132    u = ast_module_user_add(chan);
00133 
00134    if (socketpair(AF_LOCAL, SOCK_STREAM, 0, fds)) {
00135       ast_log(LOG_WARNING, "Unable to create socketpair\n");
00136       ast_module_user_remove(u);
00137       return -1;
00138    }
00139    
00140    ast_stopstream(chan);
00141 
00142    owriteformat = chan->writeformat;
00143    res = ast_set_write_format(chan, AST_FORMAT_SLINEAR);
00144    if (res < 0) {
00145       ast_log(LOG_WARNING, "Unable to set write format to signed linear\n");
00146       ast_module_user_remove(u);
00147       return -1;
00148    }
00149    
00150    res = NBScatplay(fds[1]);
00151    /* Wait 1000 ms first */
00152    next = ast_tvnow();
00153    next.tv_sec += 1;
00154    if (res >= 0) {
00155       pid = res;
00156       /* Order is important -- there's almost always going to be mp3...  we want to prioritize the
00157          user */
00158       for (;;) {
00159          ms = ast_tvdiff_ms(next, ast_tvnow());
00160          if (ms <= 0) {
00161             res = timed_read(fds[0], myf.frdata, sizeof(myf.frdata));
00162             if (res > 0) {
00163                myf.f.frametype = AST_FRAME_VOICE;
00164                myf.f.subclass = AST_FORMAT_SLINEAR;
00165                myf.f.datalen = res;
00166                myf.f.samples = res / 2;
00167                myf.f.mallocd = 0;
00168                myf.f.offset = AST_FRIENDLY_OFFSET;
00169                myf.f.src = __PRETTY_FUNCTION__;
00170                myf.f.delivery.tv_sec = 0;
00171                myf.f.delivery.tv_usec = 0;
00172                myf.f.data = myf.frdata;
00173                if (ast_write(chan, &myf.f) < 0) {
00174                   res = -1;
00175                   break;
00176                }
00177             } else {
00178                ast_log(LOG_DEBUG, "No more mp3\n");
00179                res = 0;
00180                break;
00181             }
00182             next = ast_tvadd(next, ast_samp2tv(myf.f.samples, 8000));
00183          } else {
00184             ms = ast_waitfor(chan, ms);
00185             if (ms < 0) {
00186                ast_log(LOG_DEBUG, "Hangup detected\n");
00187                res = -1;
00188                break;
00189             }
00190             if (ms) {
00191                f = ast_read(chan);
00192                if (!f) {
00193                   ast_log(LOG_DEBUG, "Null frame == hangup() detected\n");
00194                   res = -1;
00195                   break;
00196                }
00197                if (f->frametype == AST_FRAME_DTMF) {
00198                   ast_log(LOG_DEBUG, "User pressed a key\n");
00199                   ast_frfree(f);
00200                   res = 0;
00201                   break;
00202                }
00203                ast_frfree(f);
00204             } 
00205          }
00206       }
00207    }
00208    close(fds[0]);
00209    close(fds[1]);
00210    
00211    if (pid > -1)
00212       kill(pid, SIGKILL);
00213    if (!res && owriteformat)
00214       ast_set_write_format(chan, owriteformat);
00215 
00216    ast_module_user_remove(u);
00217 
00218    return res;
00219 }
00220 
00221 static int unload_module(void)
00222 {
00223    int res;
00224 
00225    res = ast_unregister_application(app);
00226 
00227    ast_module_user_hangup_all();
00228 
00229    return res;
00230 }
00231 
00232 static int load_module(void)
00233 {
00234    return ast_register_application(app, NBScat_exec, synopsis, descrip);
00235 }
00236 
00237 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Silly NBS Stream Application");

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