app_ices.c

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/*
 * 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)
 *
 * \author Mark Spencer <markster@digium.com>
 * 
 * \extref ICES - http://www.icecast.org/ices.php
 *
 * \ingroup applications
 */

/*** MODULEINFO
   <support_level>extended</support_level>
 ***/
 
#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision: 361476 $")

#include <signal.h>
#include <fcntl.h>
#include <sys/time.h>

#include "asterisk/paths.h"   /* use ast_config_AST_CONFIG_DIR */
#include "asterisk/lock.h"
#include "asterisk/file.h"
#include "asterisk/channel.h"
#include "asterisk/frame.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/translate.h"
#include "asterisk/app.h"

/*** DOCUMENTATION
   <application name="ICES" language="en_US">
      <synopsis>
         Encode and stream using 'ices'.
      </synopsis>
      <syntax>
         <parameter name="config" required="true">
            <para>ICES configuration file.</para>
         </parameter>
      </syntax>
      <description>
         <para>Streams to an icecast server using ices (available separately).
         A configuration file must be supplied for ices (see contrib/asterisk-ices.xml).</para>
         <note><para>ICES version 2 client and server required.</para></note>
      </description>
   </application>

 ***/

#define path_BIN "/usr/bin/"
#define path_LOCAL "/usr/local/bin/"

static char *app = "ICES";

static int icesencode(char *filename, int fd)
{
   int res;

   res = ast_safe_fork(0);
   if (res < 0) 
      ast_log(LOG_WARNING, "Fork failed\n");
   if (res) {
      return res;
   }

   if (ast_opt_high_priority)
      ast_set_priority(0);
   dup2(fd, STDIN_FILENO);
   ast_close_fds_above_n(STDERR_FILENO);

   /* Most commonly installed in /usr/local/bin 
    * But many places has it in /usr/bin 
    * As a last-ditch effort, try to use PATH
    */
   execl(path_LOCAL "ices2", "ices", filename, SENTINEL);
   execl(path_BIN "ices2", "ices", filename, SENTINEL);
   execlp("ices2", "ices", filename, SENTINEL);

   ast_debug(1, "Couldn't find ices version 2, attempting to use ices version 1.\n");

   execl(path_LOCAL "ices", "ices", filename, SENTINEL);
   execl(path_BIN "ices", "ices", filename, SENTINEL);
   execlp("ices", "ices", filename, SENTINEL);

   ast_log(LOG_WARNING, "Execute of ices failed, could not find command.\n");
   close(fd);
   _exit(0);
}

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

   ast_format_clear(&oreadformat);
   if (ast_strlen_zero(data)) {
      ast_log(LOG_WARNING, "ICES requires an argument (configfile.xml)\n");
      return -1;
   }
   
   if (pipe(fds)) {
      ast_log(LOG_WARNING, "Unable to create pipe\n");
      return -1;
   }
   flags = fcntl(fds[1], F_GETFL);
   fcntl(fds[1], F_SETFL, flags | O_NONBLOCK);
   
   ast_stopstream(chan);

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

   ast_format_copy(&oreadformat, ast_channel_readformat(chan));
   res = ast_set_read_format_by_id(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");
      return -1;
   }
   if (((char *)data)[0] == '/')
      ast_copy_string(filename, (char *) data, sizeof(filename));
   else
      snprintf(filename, sizeof(filename), "%s/%s", ast_config_AST_CONFIG_DIR, (char *)data);
   /* Placeholder for options */    
   c = strchr(filename, '|');
   if (c)
      *c = '\0';  
   res = icesencode(filename, fds[0]);
   if (res >= 0) {
      pid = res;
      for (;;) {
         /* Wait for audio, and stream */
         ms = ast_waitfor(chan, -1);
         if (ms < 0) {
            ast_debug(1, "Hangup detected\n");
            res = -1;
            break;
         }
         f = ast_read(chan);
         if (!f) {
            ast_debug(1, "Null frame == hangup() detected\n");
            res = -1;
            break;
         }
         if (f->frametype == AST_FRAME_VOICE) {
            res = write(fds[1], f->data.ptr, 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[0]);
   close(fds[1]);

   if (pid > -1)
      kill(pid, SIGKILL);
   if (!res && oreadformat.id)
      ast_set_read_format(chan, &oreadformat);

   return res;
}

static int unload_module(void)
{
   return ast_unregister_application(app);
}

static int load_module(void)
{
   return ast_register_application_xml(app, ices_exec);
}

AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Encode and Stream via icecast and ices");