tutor / classes / Video_Stream.php

Video_Stream.php in Tutor LMS – eLearning and online course solution 2.0.1, at classes/Video_Stream.php

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1	<?php
2	/**
3	* Created by PhpStorm.
4	* User: themeum
5	* Date: 24/9/18
6	* Time: 4:03 PM
7	*/
8
9	namespace TUTOR;
10
11	if ( ! defined( 'ABSPATH' ) ) {
12	exit;
13	}
14
15
16	/**
17	* Class Video_Stream
18	*
19	* @package TUTOR
20	*
21	* TUTOR Video Stream Class
22	* @since v.1.0.0
23	*/
24
25	class Video_Stream {
26
27	private $path = '';
28	private $stream = '';
29	private $buffer = 102400;
30	private $start = -1;
31	private $end = -1;
32	private $size = 0;
33
34	private $videoFormats;
35
36	function __construct( $filePath ) {
37	$this->videoFormats = apply_filters(
38	'tutor_video_types',
39	array(
40	'mp4' => 'video/mp4',
41	'webm' => 'video/webm',
42	'ogg' => 'video/ogg',
43	)
44	);
45	$this->path = $filePath;
46	}
47
48	/**
49	* Open stream
50	*/
51	private function open() {
52	if ( ! ( $this->stream = fopen( $this->path, 'rb' ) ) ) {
53	die( 'Could not open stream for reading' );
54	}
55	}
56
57	/**
58	* Set proper header to serve the video content
59	*/
60	private function setHeader() {
61	ob_get_clean();
62
63	header( 'Content-Type: ' . $this->videoFormats[ strtolower( pathinfo( $this->path, PATHINFO_EXTENSION ) ) ] );
64	header( 'Cache-Control: max-age=2592000, public' );
65	header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', tutor_time() + 2592000 ) . ' GMT' );
66	header( 'Last-Modified: ' . gmdate( 'D, d M Y H:i:s', @filemtime( $this->path ) ) . ' GMT' );
67	$this->start = 0;
68	$this->size = filesize( $this->path );
69	$this->end = $this->size - 1;
70	header( 'Accept-Ranges: 0-' . $this->end );
71
72	if ( isset( $_SERVER['HTTP_RANGE'] ) ) {
73	$c_end = $this->end;
74	list(, $range) = explode( '=', $_SERVER['HTTP_RANGE'], 2 );
75
76	if ( $range == '-' ) {
77	$c_start = $this->size - substr( $range, 1 );
78	} else {
79	$range = explode( '-', $range );
80	$c_start = $range[0];
81
82	$c_end = ( isset( $range[1] ) && is_numeric( $range[1] ) ) ? $range[1] : $c_end;
83	}
84	$c_end = ( $c_end > $this->end ) ? $this->end : $c_end;
85	if ( $c_start > $c_end \|\| $c_start > $this->size - 1 \|\| $c_end >= $this->size ) {
86	header( 'HTTP/1.1 416 Requested Range Not Satisfiable' );
87	header( "Content-Range: bytes $this->start-$this->end/$this->size" );
88	exit;
89	}
90	$this->start = $c_start;
91	$this->end = $c_end;
92	$length = $this->end - $this->start + 1;
93	header( 'HTTP/1.1 206 Partial Content' );
94	header( 'Content-Length: ' . $length );
95	header( "Content-Range: bytes $this->start-$this->end/" . $this->size );
96	header( 'Accept-Ranges: bytes' );
97	} else {
98	header( 'Content-Length: ' . $this->size );
99	}
100
101	}
102
103	/**
104	* close currently opened stream
105	*/
106	private function end() {
107	fclose( $this->stream );
108	exit;
109	}
110
111	/**
112	* perform the streaming of calculated range
113	*/
114	private function stream() {
115	$i = $this->start;
116	set_time_limit( 0 );
117	while ( ! feof( $this->stream ) && $i <= $this->end ) {
118	$bytesToRead = $this->buffer;
119	if ( ( $i + $bytesToRead ) > $this->end ) {
120	$bytesToRead = $this->end - $i + 1;
121	}
122	// $data = fread($this->stream, $bytesToRead);
123	$data = @stream_get_contents( $this->stream, $bytesToRead, $i );
124	echo $data;
125	flush();
126	$i += $bytesToRead;
127	}
128	}
129
130	/**
131	* Start streaming tutor video content
132	*/
133	function start() {
134	$this->open();
135	$this->setHeader();
136	$this->stream();
137	$this->end();
138	}
139	}
140