.
*
**/
/**
*
* Contants
*
**/
// Set the cache for the video
define('SP_ALLOW_CACHE',true);
// Set band width limit
define('BW_LIMIT',true);
// Kilobytes per time interval
define('BWP_SIZE', 40);
// Time interval for data packets in seconds.
define('BWP_INTERVAL', 0.3);
class flv_streamer{
function __construct($g_bw, $g_st, $g_fl){
// if not url is defined, stop and give a 404 warning
if (!isset($_GET[$g_fl]) || !isset($_GET[$g_st])){
header('HTTP/1.0 404 Not Found');
die('404
At least tell me what video to _GET and where to start.');
}
// Bandwidth intervals
$bwl_interval = array('off'=>0, 'high'=>0.2, 'mid'=>0.3, 'low'=>0.6);
// Bandwidth packages sizes
$bwl_size = array('high'=>90, 'mid'=>40, 'low'=>20);
// Selected packet interval
$sel_pack_i = (isset($_GET[$g_bw]) && !empty($bwl_interval[$_GET[$g_bw]])) ? $bwl_interval[$_GET[$g_bw]] : BWP_INTERVAL;
// Selected packet size
$sel_pack_z = ((isset($_GET[$g_bw]) && !empty($bwl_size[$_GET[$g_bw]])) ? $bwl_size[$_GET[$g_bw]] : BWP_SIZE) * 1042;
// get seek position
$start_pos = intval($_GET[$g_st]);
// get file name
$vdo_file = './'.$this->getRelPa($this->getSelfUri(),htmlspecialchars($_GET[$g_fl]));
// file name
$fname = basename($vdo_file);
// Check if exist, if not, 404
if(!file_exists($vdo_file)){
header('HTTP/1.0 404 Not Found');
die('404
File "' . $vdo_file . '" not found.');
}
// File size
$fsize = filesize($vdo_file) - (($start_pos > 0) ? $start_pos + 1 : 0);
// Check if the requested file is an FLV
if(strrchr($fname, '.') != '.flv'){
header('HTTP/1.1 403 Forbidden');
die('403
You cannot acces to "' . $vdo_file . '" because of the file extension.');
}
// Can open ?
if(!$fpr = fopen($vdo_file, 'rb')){
header('HTTP/1.1 403 Forbidden');
die('403
Streamer cannot acces to "' . $vdo_file . '", Check your file perrmissions with CHMOD.');
}
// No chache ?
if(SP_ALLOW_CACHE){
session_cache_limiter("nocache");
header("Expires: Thu, 20 Sep 1980 16:30:00 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");
}
// Flash Video Header
header("Content-Type: video/x-flv");
header("Content-Disposition: attachment; filename=\"" . $fname . "\"");
header("Content-Length: " . $fsize);
// Flash Video File Format Header
if($start_pos != 0) {
echo 'FLV'.pack('C', 1).pack('C', 1).pack('N', 9).pack('N', 9);
}
// Seek to the file requested start
fseek($fpr, $start_pos);
// Start the file output
while(!feof($fpr)){
// Bandwidth limiting
if($sel_pack_i > 0 && BW_LIMIT){
// Start time
list($us, $s) = explode(' ', microtime());
$ts = ((float)$us + (float)$s);
// Echo packet
echo fread($fpr, $sel_pack_z);
// End time
list($us, $s) = explode(' ', microtime());
$tst = ((float)$us + (float)$s);
$tdi = $tst - $ts;
// Wait, when output is slower than packet interval
if($tdi < (float)$sel_pack_i){
usleep((float)$sel_pack_i * 1000000 - (float)$tdi * 1000000);
}
}else{
// output file without bandwidth limiting
echo fread($fpr, filesize($vdo_file));
}
}
}
// To know the script self uri
function getSelfUri(){
$proto = ( isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) == 'on' ) ? 'https://' : 'http://';
return $proto.$_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'];
}
// To match a relative path
function getRelPa($scr,$fil){
$scr = str_replace("http://www.", "http://", $scr);
$fil = str_replace("http://www.", "http://", $fil);
$scr_a = explode('/',$scr);
$fil_a = explode('/',$fil);
$scr_ab = $scr_a;
foreach($fil_a as $k => $dir){
if($dir == $scr_a[$k]){
$d[]=$dir;
array_shift($scr_ab);
}else{
$f[]=$dir;
}
}
$rp='';
if(count($scr_ab)>1){
array_shift($scr_ab);
foreach($scr_ab as $di){
$rp.='../';
}
}
$rp .= implode('/',$f);
return $rp;
}
}
new flv_streamer('bw','start','file');
?>