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PHP File to allow seeking in HTML5 <audio> tag. NOTE: I did not write this, check links in code for credits.
<?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 $mimeType
* @return void
*
* @link https://groups.google.com/d/msg/jplayer/nSM2UmnSKKA/Hu76jDZS4xcJ
* @link http://php.net/manual/en/function.readfile.php#86244
*/
function smartReadFile($location, $filename, $mimeType = 'application/octet-stream')
{
if (!file_exists($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;
}
}
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