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<?php |
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/** |
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* Created by PhpStorm. |
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* User: mhshohel |
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* Date: 24/9/18 |
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* Time: 4:03 PM |
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*/ |
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|
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namespace TUTOR; |
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|
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if ( ! defined( 'ABSPATH' ) ) |
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exit; |
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|
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|
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/** |
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* Class Video_Stream |
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* @package TUTOR |
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* |
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* TUTOR Video Stream Class |
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* @since v.1.0.0 |
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*/ |
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|
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class Video_Stream { |
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|
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private $path = ""; |
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private $stream = ""; |
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private $buffer = 102400; |
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private $start = -1; |
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private $end = -1; |
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private $size = 0; |
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|
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private $videoFormats; |
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|
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function __construct($filePath) { |
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$this->videoFormats = apply_filters('tutor_video_types', array("mp4"=>"video/mp4", "webm"=>"video/webm", "ogg"=>"video/ogg")) ; |
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$this->path = $filePath; |
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} |
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|
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/** |
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* Open stream |
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*/ |
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private function open() { |
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if (!($this->stream = fopen($this->path, 'rb'))) { |
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die('Could not open stream for reading'); |
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} |
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} |
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|
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/** |
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* Set proper header to serve the video content |
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*/ |
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private function setHeader() { |
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ob_get_clean(); |
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|
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header("Content-Type: {$this->videoFormats[strtolower(pathinfo($this->path, PATHINFO_EXTENSION))]}"); |
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header("Cache-Control: max-age=2592000, public"); |
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header("Expires: ".gmdate('D, d M Y H:i:s', time()+2592000) . ' GMT'); |
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header("Last-Modified: ".gmdate('D, d M Y H:i:s', @filemtime($this->path)) . ' GMT' ); |
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$this->start = 0; |
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$this->size = filesize($this->path); |
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$this->end = $this->size - 1; |
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header("Accept-Ranges: 0-".$this->end); |
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|
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if (isset($_SERVER['HTTP_RANGE'])) { |
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$c_end = $this->end; |
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list(, $range) = explode('=', $_SERVER['HTTP_RANGE'], 2); |
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|
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if ($range == '-') { |
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$c_start = $this->size - substr($range, 1); |
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}else{ |
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$range = explode('-', $range); |
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$c_start = $range[0]; |
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|
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$c_end = (isset($range[1]) && is_numeric($range[1])) ? $range[1] : $c_end; |
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} |
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$c_end = ($c_end > $this->end) ? $this->end : $c_end; |
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if ($c_start > $c_end || $c_start > $this->size - 1 || $c_end >= $this->size) { |
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header('HTTP/1.1 416 Requested Range Not Satisfiable'); |
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header("Content-Range: bytes $this->start-$this->end/$this->size"); |
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exit; |
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} |
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$this->start = $c_start; |
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$this->end = $c_end; |
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$length = $this->end - $this->start + 1; |
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header('HTTP/1.1 206 Partial Content'); |
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header("Content-Length: ".$length); |
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header("Content-Range: bytes $this->start-$this->end/".$this->size); |
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header("Accept-Ranges: bytes"); |
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} |
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else { |
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header("Content-Length: ".$this->size); |
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} |
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|
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} |
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|
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/** |
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* close currently opened stream |
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*/ |
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private function end() { |
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fclose($this->stream); |
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exit; |
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} |
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|
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/** |
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* perform the streaming of calculated range |
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*/ |
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private function stream() { |
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$i = $this->start; |
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set_time_limit(0); |
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while(!feof($this->stream) && $i <= $this->end) { |
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$bytesToRead = $this->buffer; |
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if(($i+$bytesToRead) > $this->end) { |
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$bytesToRead = $this->end - $i + 1; |
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} |
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//$data = fread($this->stream, $bytesToRead); |
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$data = @stream_get_contents($this->stream, $bytesToRead, $i); |
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echo $data; |
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flush(); |
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$i += $bytesToRead; |
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} |
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} |
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|
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/** |
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* Start streaming tutor video content |
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*/ |
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function start() { |
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$this->open(); |
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$this->setHeader(); |
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$this->stream(); |
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$this->end(); |
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} |
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} |
