Xmoov flv streaming php script

<?php
//------------------------------------------------------------------------------------------
// MEDIA PATH
//------------------------------------------------------------------------------------------
// you can configure these settings to point to video files outside the public html folder.
//
// points to server root
define('XMOOV_PATH_ROOT', '');
//
// points to the folder containing the video files.
define('XMOOV_PATH_FILES', './');

//------------------------------------------------------------------------------------------
// BEHAVIOR
//------------------------------------------------------------------------------------------
//
//set to TRUE to use bandwidth limiting.
define('XMOOV_CONF_LIMIT_BANDWIDTH', FALSE);
//
//set to FALSE to prohibit caching of video files.
define('XMOOV_CONF_ALLOW_FILE_CACHE', TRUE);

//------------------------------------------------------------------------------------------
// BANDWIDTH SETTINGS
//------------------------------------------------------------------------------------------
// these settings are only needed when using bandwidth limiting.
//
// bandwidth is limited my sending a limited amount of video data(XMOOV_BW_PACKET_SIZE),
// in specified time intervals(XMOOV_BW_PACKET_INTERVAL).
// avoid time intervals over 1.5 seconds for best results.
//
// you can also control bandwidth limiting via http command using your video player.
// the function getBandwidthLimit($part) holds three preconfigured presets(low, mid, high),
// which can be changed to meet your needs
//
//set how many kilobytes will be sent per time interval
define('XMOOV_BW_PACKET_SIZE', 90);
//
//set the time interval in which data packets will be sent in seconds.
define('XMOOV_BW_PACKET_INTERVAL', 0.3);
//
//set to TRUE to control bandwidth externally via http.
define('XMOOV_CONF_ALLOW_DYNAMIC_BANDWIDTH', TRUE);

//------------------------------------------------------------------------------------------
// INCOMING GET VARIABLES CONFIGURATION
//------------------------------------------------------------------------------------------
//
// use these settings to configure how video files, seek position and bandwidth settings are
// accessed by your player
//
define('XMOOV_GET_FILE', 'file');
define('XMOOV_GET_POSITION', 'pos');
define('XMOOV_GET_AUTHENTICATION', 'key');
define('XMOOV_GET_BANDWIDTH', 'bw');

///////////////////////////////////////////////////////////////////////////////////////////////////////////////
// END SCRIPT CONFIGURATION - do not change anything beyond this point if you do not know what you are doing //
///////////////////////////////////////////////////////////////////////////////////////////////////////////////

//------------------------------------------------------------------------------------------
// PROCESS FILE REQUEST
//------------------------------------------------------------------------------------------

if(isset($_GET[XMOOV_GET_FILE]))
{
  // PROCESS VARIABLES
  // get seek position - JWMP doesn't send pos on the first request
  $seekPos = isset($_GET[XMOOV_GET_POSITION]) ? intval($_GET[XMOOV_GET_POSITION]) : 0;
  // get file name
  $fileName = htmlspecialchars($_GET[XMOOV_GET_FILE]);
  // assemble file path
  $file = XMOOV_PATH_ROOT . XMOOV_PATH_FILES . $fileName;
  // assemble packet interval
  $packet_interval = (XMOOV_CONF_ALLOW_DYNAMIC_BANDWIDTH && isset($_GET[XMOOV_GET_BANDWIDTH])) ? getBandwidthLimit('interval') : XMOOV_BW_PACKET_INTERVAL;
  // assemble packet size
  $packet_size = ((XMOOV_CONF_ALLOW_DYNAMIC_BANDWIDTH && isset($_GET[XMOOV_GET_BANDWIDTH])) ? getBandwidthLimit('size') : XMOOV_BW_PACKET_SIZE) * 1042;

  // security improved by by TRUI www.trui.net
  if (!file_exists($file))
  {
    print('<b>ERROR:</b> xmoov-php could not find (' . $fileName . ') please check your settings.');
    exit();
  }

  if(file_exists($file) && strrchr($fileName, '.') == '.flv' && strlen($fileName) > 2 && !eregi(basename($_SERVER['PHP_SELF']), $fileName) && ereg('^[^./][^/]*$', $fileName))
  {
    $fh = fopen($file, 'rb') or die ('<b>ERROR:</b> xmoov-php could not open (' . $fileName . ')');

    $fileSize = filesize($file) - (($seekPos > 0) ? $seekPos + 1 : 0);

    // SEND HEADERS
    if(!XMOOV_CONF_ALLOW_FILE_CACHE)
    {
      // prohibit caching (different methods for different clients)
      session_cache_limiter("nocache");
      header("Expires: Thu, 19 Nov 1981 08:52:00 GMT");
      header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
      header("Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
      header("Pragma: no-cache");
    }

    // content headers
    header("Content-Type: video/x-flv");
    // header("Content-Disposition: attachment; filename=\"" . $fileName . "\"");
    header("Content-Length: " . $fileSize);

    // FLV file format header
    if($seekPos != 0)
    {
      print('FLV');
      print(pack('C', 1));
      print(pack('C', 1));
      print(pack('N', 9));
      print(pack('N', 9));
    }

    // seek to requested file position
    fseek($fh, $seekPos);

    // output file
    while(!feof($fh))
    {
      // use bandwidth limiting - by Terry
      if(XMOOV_CONF_LIMIT_BANDWIDTH)
      {
        // get start time
        list($usec, $sec) = explode(' ', microtime());
        $time_start = ((float)$usec + (float)$sec);
        // output packet
        print(fread($fh, $packet_size));
        // get end time
        list($usec, $sec) = explode(' ', microtime());
        $time_stop = ((float)$usec + (float)$sec);
        // wait if output is slower than $packet_interval
        $time_difference = $time_stop - $time_start;
        if($time_difference < (float)$packet_interval)
        {
          usleep((float)$packet_interval * 1000000 - (float)$time_difference * 1000000);
        }
      }
      else
      {
        // output file without bandwidth limiting
        while (!feof($fh))
        {
          print(fread($fh, 16384));
        }
      }
    }
  }
}

//------------------------------------------------------------------------------------------
// DYNAMIC BANDWIDTH CONTROL
//------------------------------------------------------------------------------------------
//
function getBandwidthLimit($part)
{
  switch($part)
  {
    case 'interval' :
      switch($_GET[XMOOV_GET_BANDWIDTH])
        {
          case 'low' :
            return 1;
            break;
          case 'mid' :
            return 0.5;
            break;
          case 'high' :
            return 0.3;
            break;
          default :
            return XMOOV_BW_PACKET_INTERVAL;
            break;
        }
      break;
    case 'size' :
      switch($_GET[XMOOV_GET_BANDWIDTH])
      {
        case 'low' :
          return 10;
          break;
        case 'mid' :
          return 40;
          break;
        case 'high' :
          return 90;
          break;
        default :
          return XMOOV_BW_PACKET_SIZE;
          break;
      }
    break;
  }
}

?>