apps/app_nbscat.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 NBScat file -- uses nbscat8k
  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 #include <sys/socket.h>
  40
  41 #include "asterisk/lock.h"
  42 #include "asterisk/file.h"
  43 #include "asterisk/logger.h"
  44 #include "asterisk/channel.h"
  45 #include "asterisk/frame.h"
  46 #include "asterisk/pbx.h"
  47 #include "asterisk/module.h"
  48 #include "asterisk/translate.h"
  49 #include "asterisk/options.h"
  50
  51 #define LOCAL_NBSCAT "/usr/local/bin/nbscat8k"
  52 #define NBSCAT "/usr/bin/nbscat8k"
  53
  54 #ifndef AF_LOCAL
  55 #define AF_LOCAL AF_UNIX
  56 #endif
  57
  58 static char *app = "NBScat";
  59
  60 static char *synopsis = "Play an NBS local stream";
  61
  62 static char *descrip =
  63 "  NBScat: Executes nbscat to listen to the local NBS stream.\n"
  64 "User can exit by pressing any key\n.";
  65
  66
  67 static int NBScatplay(int fd)
  68 {
  69         int res;
  70         int x;
  71         sigset_t fullset, oldset;
  72
  73         sigfillset(&fullset);
  74         pthread_sigmask(SIG_BLOCK, &fullset, &oldset);
  75
  76         res = fork();
  77         if (res < 0)
  78                 ast_log(LOG_WARNING, "Fork failed\n");
  79         if (res) {
  80                 pthread_sigmask(SIG_SETMASK, &oldset, NULL);
  81                 return res;
  82         }
  83         signal(SIGPIPE, SIG_DFL);
  84         pthread_sigmask(SIG_UNBLOCK, &fullset, NULL);
  85
  86         if (ast_opt_high_priority)
  87                 ast_set_priority(0);
  88
  89         dup2(fd, STDOUT_FILENO);
  90         for (x = STDERR_FILENO + 1; x < 1024; x++) {
  91                 if (x != STDOUT_FILENO)
  92                         close(x);
  93         }
  94         /* Most commonly installed in /usr/local/bin */
  95         execl(NBSCAT, "nbscat8k", "-d", (char *)NULL);
  96         execl(LOCAL_NBSCAT, "nbscat8k", "-d", (char *)NULL);
  97         ast_log(LOG_WARNING, "Execute of nbscat8k failed\n");
  98         _exit(0);
  99 }
 100
 101 static int timed_read(int fd, void *data, int datalen)
 102 {
 103         int res;
 104         struct pollfd fds[1];
 105         fds[0].fd = fd;
 106         fds[0].events = POLLIN;
 107         res = poll(fds, 1, 2000);
 108         if (res < 1) {
 109                 ast_log(LOG_NOTICE, "Selected timed out/errored out with %d\n", res);
 110                 return -1;
 111         }
 112         return read(fd, data, datalen);
 113
 114 }
 115
 116 static int NBScat_exec(struct ast_channel *chan, void *data)
 117 {
 118         int res=0;
 119         struct ast_module_user *u;
 120         int fds[2];
 121         int ms = -1;
 122         int pid = -1;
 123         int owriteformat;
 124         struct timeval next;
 125         struct ast_frame *f;
 126         struct myframe {
 127                 struct ast_frame f;
 128                 char offset[AST_FRIENDLY_OFFSET];
 129                 short frdata[160];
 130         } myf;
 131
 132         u = ast_module_user_add(chan);
 133
 134         if (socketpair(AF_LOCAL, SOCK_STREAM, 0, fds)) {
 135                 ast_log(LOG_WARNING, "Unable to create socketpair\n");
 136                 ast_module_user_remove(u);
 137                 return -1;
 138         }
 139
 140         ast_stopstream(chan);
 141
 142         owriteformat = chan->writeformat;
 143         res = ast_set_write_format(chan, AST_FORMAT_SLINEAR);
 144         if (res < 0) {
 145                 ast_log(LOG_WARNING, "Unable to set write format to signed linear\n");
 146                 ast_module_user_remove(u);
 147                 return -1;
 148         }
 149
 150         res = NBScatplay(fds[1]);
 151         /* Wait 1000 ms first */
 152         next = ast_tvnow();
 153         next.tv_sec += 1;
 154         if (res >= 0) {
 155                 pid = res;
 156                 /* Order is important -- there's almost always going to be mp3...  we want to prioritize the
 157                    user */
 158                 for (;;) {
 159                         ms = ast_tvdiff_ms(next, ast_tvnow());
 160                         if (ms <= 0) {
 161                                 res = timed_read(fds[0], myf.frdata, sizeof(myf.frdata));
 162                                 if (res > 0) {
 163                                         myf.f.frametype = AST_FRAME_VOICE;
 164                                         myf.f.subclass = AST_FORMAT_SLINEAR;
 165                                         myf.f.datalen = res;
 166                                         myf.f.samples = res / 2;
 167                                         myf.f.mallocd = 0;
 168                                         myf.f.offset = AST_FRIENDLY_OFFSET;
 169                                         myf.f.src = __PRETTY_FUNCTION__;
 170                                         myf.f.delivery.tv_sec = 0;
 171                                         myf.f.delivery.tv_usec = 0;
 172                                         myf.f.data = myf.frdata;
 173                                         if (ast_write(chan, &myf.f) < 0) {
 174                                                 res = -1;
 175                                                 break;
 176                                         }
 177                                 } else {
 178                                         ast_log(LOG_DEBUG, "No more mp3\n");
 179                                         res = 0;
 180                                         break;
 181                                 }
 182                                 next = ast_tvadd(next, ast_samp2tv(myf.f.samples, 8000));
 183                         } else {
 184                                 ms = ast_waitfor(chan, ms);
 185                                 if (ms < 0) {
 186                                         ast_log(LOG_DEBUG, "Hangup detected\n");
 187                                         res = -1;
 188                                         break;
 189                                 }
 190                                 if (ms) {
 191                                         f = ast_read(chan);
 192                                         if (!f) {
 193                                                 ast_log(LOG_DEBUG, "Null frame == hangup() detected\n");
 194                                                 res = -1;
 195                                                 break;
 196                                         }
 197                                         if (f->frametype == AST_FRAME_DTMF) {
 198                                                 ast_log(LOG_DEBUG, "User pressed a key\n");
 199                                                 ast_frfree(f);
 200                                                 res = 0;
 201                                                 break;
 202                                         }
 203                                         ast_frfree(f);
 204                                 }
 205                         }
 206                 }
 207         }
 208         close(fds[0]);
 209         close(fds[1]);
 210
 211         if (pid > -1)
 212                 kill(pid, SIGKILL);
 213         if (!res && owriteformat)
 214                 ast_set_write_format(chan, owriteformat);
 215
 216         ast_module_user_remove(u);
 217
 218         return res;
 219 }
 220
 221 static int unload_module(void)
 222 {
 223         int res;
 224
 225         res = ast_unregister_application(app);
 226
 227         ast_module_user_hangup_all();
 228
 229         return res;
 230 }
 231
 232 static int load_module(void)
 233 {
 234         return ast_register_application(app, NBScat_exec, synopsis, descrip);
 235 }
 236
 237 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Silly NBS Stream Application");