Thu Oct 9 06:44:46 2008

Asterisk developer's documentation

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app_ices.c

Go to the documentation of this file.

/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief Stream to an icecast server via ICES (see contrib/asterisk-ices.xml)
 * 
 * \ingroup applications
 */
 
#include <string.h>
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/time.h>
#include <errno.h>

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision: 48374 $")

#include "asterisk/lock.h"
#include "asterisk/file.h"
#include "asterisk/logger.h"
#include "asterisk/channel.h"
#include "asterisk/frame.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/translate.h"
#include "asterisk/options.h"

#define ICES "/usr/bin/ices"
#define LOCAL_ICES "/usr/local/bin/ices"

static char *tdesc = "Encode and Stream via icecast and ices";

static char *app = "ICES";

static char *synopsis = "Encode and stream using 'ices'";

static char *descrip = 
"  ICES(config.xml) Streams to an icecast server using ices\n"
"(available separately).  A configuration file must be supplied\n"
"for ices (see examples/asterisk-ices.conf). \n";

STANDARD_LOCAL_USER;

LOCAL_USER_DECL;

static int icesencode(char *filename, int fd)
{
   int res;
   int x;
   sigset_t fullset, oldset;

   sigfillset(&fullset);
   pthread_sigmask(SIG_BLOCK, &fullset, &oldset);

   res = fork();
   if (res < 0) 
      ast_log(LOG_WARNING, "Fork failed\n");
   if (res) {
      pthread_sigmask(SIG_SETMASK, &oldset, NULL);
      return res;
   }

   /* Stop ignoring PIPE */
   signal(SIGPIPE, SIG_DFL);
   pthread_sigmask(SIG_UNBLOCK, &fullset, NULL);

   if (option_highpriority)
      ast_set_priority(0);
   dup2(fd, STDIN_FILENO);
   for (x=STDERR_FILENO + 1;x<1024;x++) {
      if ((x != STDIN_FILENO) && (x != STDOUT_FILENO))
         close(x);
   }
   /* Most commonly installed in /usr/local/bin */
   execl(ICES, "ices", filename, (char *)NULL);
   /* But many places has it in /usr/bin */
   execl(LOCAL_ICES, "ices", filename, (char *)NULL);
   /* As a last-ditch effort, try to use PATH */
   execlp("ices", "ices", filename, (char *)NULL);
   ast_log(LOG_WARNING, "Execute of ices failed\n");
   _exit(0);
}

static int ices_exec(struct ast_channel *chan, void *data)
{
   int res=0;
   struct localuser *u;
   int fds[2];
   int ms = -1;
   int pid = -1;
   int flags;
   int oreadformat;
   struct timeval last;
   struct ast_frame *f;
   char filename[256]="";
   char *c;

   if (ast_strlen_zero(data)) {
      ast_log(LOG_WARNING, "ICES requires an argument (configfile.xml)\n");
      return -1;
   }

   LOCAL_USER_ADD(u);
   
   last = ast_tv(0, 0);
   
   if (pipe(fds)) {
      ast_log(LOG_WARNING, "Unable to create pipe\n");
      LOCAL_USER_REMOVE(u);
      return -1;
   }
   flags = fcntl(fds[1], F_GETFL);
   fcntl(fds[1], F_SETFL, flags | O_NONBLOCK);
   
   ast_stopstream(chan);

   if (chan->_state != AST_STATE_UP)
      res = ast_answer(chan);
      
   if (res) {
      close(fds[0]);
      close(fds[1]);
      ast_log(LOG_WARNING, "Answer failed!\n");
      LOCAL_USER_REMOVE(u);
      return -1;
   }

   oreadformat = chan->readformat;
   res = ast_set_read_format(chan, AST_FORMAT_SLINEAR);
   if (res < 0) {
      close(fds[0]);
      close(fds[1]);
      ast_log(LOG_WARNING, "Unable to set write format to signed linear\n");
      LOCAL_USER_REMOVE(u);
      return -1;
   }
   if (((char *)data)[0] == '/')
      strncpy(filename, (char *)data, sizeof(filename) - 1);
   else
      snprintf(filename, sizeof(filename), "%s/%s", (char *)ast_config_AST_CONFIG_DIR, (char *)data);
   /* Placeholder for options */    
   c = strchr(filename, '|');
   if (c)
      *c = '\0';  
   res = icesencode(filename, fds[0]);
   close(fds[0]);
   if (res >= 0) {
      pid = res;
      for (;;) {
         /* Wait for audio, and stream */
         ms = ast_waitfor(chan, -1);
         if (ms < 0) {
            ast_log(LOG_DEBUG, "Hangup detected\n");
            res = -1;
            break;
         }
         f = ast_read(chan);
         if (!f) {
            ast_log(LOG_DEBUG, "Null frame == hangup() detected\n");
            res = -1;
            break;
         }
         if (f->frametype == AST_FRAME_VOICE) {
            res = write(fds[1], f->data, f->datalen);
            if (res < 0) {
               if (errno != EAGAIN) {
                  ast_log(LOG_WARNING, "Write failed to pipe: %s\n", strerror(errno));
                  res = -1;
                  ast_frfree(f);
                  break;
               }
            }
         }
         ast_frfree(f);
      }
   }
   close(fds[1]);
   
   if (pid > -1)
      kill(pid, SIGKILL);
   if (!res && oreadformat)
      ast_set_read_format(chan, oreadformat);

   LOCAL_USER_REMOVE(u);

   return res;
}

int unload_module(void)
{
   int res;

   res = ast_unregister_application(app);

   STANDARD_HANGUP_LOCALUSERS;

   return res;
}

int load_module(void)
{
   return ast_register_application(app, ices_exec, synopsis, descrip);
}

char *description(void)
{
   return tdesc;
}

int usecount(void)
{
   int res;
   STANDARD_USECOUNT(res);
   return res;
}

char *key()
{
   return ASTERISK_GPL_KEY;
}

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