smartReadFile.php

<?php
/**
* Reads the requested portion of a file and sends its contents to the client with the appropriate headers.
* 
* This HTTP_RANGE compatible read file function is necessary for allowing streaming media to be skipped around in.
* 
* @param string $location
* @param string $filename
* @param string $mimeType
* @return void
* 
* @link https://groups.google.com/d/msg/jplayer/nSM2UmnSKKA/Hu76jDZS4xcJ
* @link http://php.net/manual/en/function.readfile.php#86244


*/
$filename=$_GET['filename'];
$location='audio/'.$filename;

$extension = substr(strrchr($filename,'.'),1);
if ($extension == "mp3") {
	$mimeType = "audio/mpeg, audio/x-mpeg, audio/x-mpeg-3, audio/mpeg3";
} else if ($extension == "ogg") {
	$mimeType = "audio/ogg";

}

if (!file_exists($location))
{
	header ("HTTP/1.1 404 Not Found");
	return;
}

$size    = filesize($location);
$time    = date('r', filemtime($location));


$fm = @fopen($location, 'rb');
if (!$fm)
{
	header ("HTTP/1.1 505 Internal server error");
	return;
}

$begin    = 0;
$end    = $size - 1;

if (isset($_SERVER['HTTP_RANGE']))
{
	if (preg_match('/bytes=\h*(\d+)-(\d*)[\D.*]?/i', $_SERVER['HTTP_RANGE'], $matches))
	{
		$begin    = intval($matches[1]);
		if (!empty($matches[2]))
		{
			$end    = intval($matches[2]);
		}
	}
}

if (isset($_SERVER['HTTP_RANGE']))
{

	header('HTTP/1.1 206 Partial Content');
}
else
{
	header('HTTP/1.1 200 OK');
}

header("Content-Type: $mimeType"); 
header('Cache-Control: public, must-revalidate, max-age=0');
header('Pragma: no-cache');  
header('Accept-Ranges: bytes');
header('Content-Length:' . (($end - $begin) + 1));
if (isset($_SERVER['HTTP_RANGE']))

{
		
	header("Content-Range: bytes $begin-$end/$size");
}
header("Content-Disposition: inline; filename=$filename");
header("Content-Transfer-Encoding: binary");
header("Last-Modified: $time");

$cur    = $begin;
fseek($fm, $begin, 0);

while(!feof($fm) && $cur <= $end && (connection_status() == 0))
{
	print fread($fm, min(1024 * 16, ($end - $cur) + 1));
	$cur += 1024 * 16;
}
?>