Sat Sep 16 07:28:05 2006

Asterisk developer's documentation


app_ices.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 Stream to an icecast server via ICES (see contrib/asterisk-ices.xml)
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 #include <errno.h>
00034 
00035 #include "asterisk.h"
00036 
00037 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 33515 $")
00038 
00039 #include "asterisk/lock.h"
00040 #include "asterisk/file.h"
00041 #include "asterisk/logger.h"
00042 #include "asterisk/channel.h"
00043 #include "asterisk/frame.h"
00044 #include "asterisk/pbx.h"
00045 #include "asterisk/module.h"
00046 #include "asterisk/translate.h"
00047 #include "asterisk/options.h"
00048 
00049 #define ICES "/usr/bin/ices"
00050 #define LOCAL_ICES "/usr/local/bin/ices"
00051 
00052 static char *tdesc = "Encode and Stream via icecast and ices";
00053 
00054 static char *app = "ICES";
00055 
00056 static char *synopsis = "Encode and stream using 'ices'";
00057 
00058 static char *descrip = 
00059 "  ICES(config.xml) Streams to an icecast server using ices\n"
00060 "(available separately).  A configuration file must be supplied\n"
00061 "for ices (see examples/asterisk-ices.conf). \n";
00062 
00063 STANDARD_LOCAL_USER;
00064 
00065 LOCAL_USER_DECL;
00066 
00067 static int icesencode(char *filename, int fd)
00068 {
00069    int res;
00070    int x;
00071    res = fork();
00072    if (res < 0) 
00073       ast_log(LOG_WARNING, "Fork failed\n");
00074    if (res)
00075       return res;
00076    if (option_highpriority)
00077       ast_set_priority(0);
00078    dup2(fd, STDIN_FILENO);
00079    for (x=STDERR_FILENO + 1;x<256;x++) {
00080       if ((x != STDIN_FILENO) && (x != STDOUT_FILENO))
00081          close(x);
00082    }
00083    /* Most commonly installed in /usr/local/bin */
00084    execl(ICES, "ices", filename, (char *)NULL);
00085    /* But many places has it in /usr/bin */
00086    execl(LOCAL_ICES, "ices", filename, (char *)NULL);
00087    /* As a last-ditch effort, try to use PATH */
00088    execlp("ices", "ices", filename, (char *)NULL);
00089    ast_log(LOG_WARNING, "Execute of ices failed\n");
00090    return -1;
00091 }
00092 
00093 static int ices_exec(struct ast_channel *chan, void *data)
00094 {
00095    int res=0;
00096    struct localuser *u;
00097    int fds[2];
00098    int ms = -1;
00099    int pid = -1;
00100    int flags;
00101    int oreadformat;
00102    struct timeval last;
00103    struct ast_frame *f;
00104    char filename[256]="";
00105    char *c;
00106 
00107    if (ast_strlen_zero(data)) {
00108       ast_log(LOG_WARNING, "ICES requires an argument (configfile.xml)\n");
00109       return -1;
00110    }
00111 
00112    LOCAL_USER_ADD(u);
00113    
00114    last = ast_tv(0, 0);
00115    
00116    if (pipe(fds)) {
00117       ast_log(LOG_WARNING, "Unable to create pipe\n");
00118       LOCAL_USER_REMOVE(u);
00119       return -1;
00120    }
00121    flags = fcntl(fds[1], F_GETFL);
00122    fcntl(fds[1], F_SETFL, flags | O_NONBLOCK);
00123    
00124    ast_stopstream(chan);
00125 
00126    if (chan->_state != AST_STATE_UP)
00127       res = ast_answer(chan);
00128       
00129    if (res) {
00130       close(fds[0]);
00131       close(fds[1]);
00132       ast_log(LOG_WARNING, "Answer failed!\n");
00133       LOCAL_USER_REMOVE(u);
00134       return -1;
00135    }
00136 
00137    oreadformat = chan->readformat;
00138    res = ast_set_read_format(chan, AST_FORMAT_SLINEAR);
00139    if (res < 0) {
00140       close(fds[0]);
00141       close(fds[1]);
00142       ast_log(LOG_WARNING, "Unable to set write format to signed linear\n");
00143       LOCAL_USER_REMOVE(u);
00144       return -1;
00145    }
00146    if (((char *)data)[0] == '/')
00147       strncpy(filename, (char *)data, sizeof(filename) - 1);
00148    else
00149       snprintf(filename, sizeof(filename), "%s/%s", (char *)ast_config_AST_CONFIG_DIR, (char *)data);
00150    /* Placeholder for options */    
00151    c = strchr(filename, '|');
00152    if (c)
00153       *c = '\0';  
00154    res = icesencode(filename, fds[0]);
00155    close(fds[0]);
00156    if (res >= 0) {
00157       pid = res;
00158       for (;;) {
00159          /* Wait for audio, and stream */
00160          ms = ast_waitfor(chan, -1);
00161          if (ms < 0) {
00162             ast_log(LOG_DEBUG, "Hangup detected\n");
00163             res = -1;
00164             break;
00165          }
00166          f = ast_read(chan);
00167          if (!f) {
00168             ast_log(LOG_DEBUG, "Null frame == hangup() detected\n");
00169             res = -1;
00170             break;
00171          }
00172          if (f->frametype == AST_FRAME_VOICE) {
00173             res = write(fds[1], f->data, f->datalen);
00174             if (res < 0) {
00175                if (errno != EAGAIN) {
00176                   ast_log(LOG_WARNING, "Write failed to pipe: %s\n", strerror(errno));
00177                   res = -1;
00178                   ast_frfree(f);
00179                   break;
00180                }
00181             }
00182          }
00183          ast_frfree(f);
00184       }
00185    }
00186    close(fds[1]);
00187    
00188    if (pid > -1)
00189       kill(pid, SIGKILL);
00190    if (!res && oreadformat)
00191       ast_set_read_format(chan, oreadformat);
00192 
00193    LOCAL_USER_REMOVE(u);
00194 
00195    return res;
00196 }
00197 
00198 int unload_module(void)
00199 {
00200    int res;
00201 
00202    res = ast_unregister_application(app);
00203 
00204    STANDARD_HANGUP_LOCALUSERS;
00205 
00206    return res;
00207 }
00208 
00209 int load_module(void)
00210 {
00211    return ast_register_application(app, ices_exec, synopsis, descrip);
00212 }
00213 
00214 char *description(void)
00215 {
00216    return tdesc;
00217 }
00218 
00219 int usecount(void)
00220 {
00221    int res;
00222    STANDARD_USECOUNT(res);
00223    return res;
00224 }
00225 
00226 char *key()
00227 {
00228    return ASTERISK_GPL_KEY;
00229 }

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