tutor / classes / Video_Stream.php

Video_Stream.php in Tutor LMS – eLearning and online course solution 3.9.2, at classes/Video_Stream.php

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1	<?php
2	/**
3	* Video Stream
4	*
5	* @package Tutor\VideoStream
6	* @author Themeum <support@themeum.com>
7	* @link https://themeum.com
8	* @since 1.0.0
9	*/
10
11	namespace TUTOR;
12
13	if ( ! defined( 'ABSPATH' ) ) {
14	exit;
15	}
16
17
18	/**
19	* Class Video_Stream
20	*
21	* @since 1.0.0
22	*/
23	class Video_Stream {
24
25	/**
26	* Path
27	*
28	* @since 1.0.0
29	*
30	* @var string
31	*/
32	private $path = '';
33
34	/**
35	* Stream
36	*
37	* @since 1.0.0
38	*
39	* @var string
40	*/
41	private $stream = '';
42
43	/**
44	* Buffer time
45	*
46	* @since 1.0.0
47	*
48	* @var string
49	*/
50	private $buffer = 102400;
51
52	/**
53	* Start
54	*
55	* @since 1.0.0
56	*
57	* @var int
58	*/
59	private $start = -1;
60
61	/**
62	* End
63	*
64	* @since 1.0.0
65	*
66	* @var int
67	*/
68	private $end = -1;
69
70	/**
71	* Size
72	*
73	* @since 1.0.0
74	*
75	* @var int
76	*/
77	private $size = 0;
78
79	/**
80	* Video format
81	*
82	* @since 1.0.0
83	*
84	* @var string
85	*/
86	private $video_format;
87
88	/**
89	* Resolve dependencies
90	*
91	* @since 1.0.0
92	*
93	* @param string $file_path file path.
94	*/
95	public function __construct( $file_path ) {
96	$this->video_format = apply_filters(
97	'tutor_video_types',
98	array(
99	'mp4' => 'video/mp4',
100	'webm' => 'video/webm',
101	'ogg' => 'video/ogg',
102	)
103	);
104	$this->path = $file_path;
105	}
106
107	/**
108	* Open stream
109	*
110	* @since 1.0.0
111	*
112	* @return void
113	*/
114	private function open() {
115	$this->stream = fopen( $this->path, 'rb' );
116	if ( ! ( $this->stream ) ) {
117	die( 'Could not open stream for reading' );
118	}
119	}
120
121	/**
122	* Set proper header to serve the video content
123	*
124	* @since 1.0.0
125	*
126	* @return void
127	*/
128	private function set_header() {
129	ob_get_clean();
130
131	header( 'Content-Type: ' . $this->video_format[ strtolower( pathinfo( $this->path, PATHINFO_EXTENSION ) ) ] );
132	header( 'Cache-Control: max-age=2592000, public' );
133	header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', tutor_time() + 2592000 ) . ' GMT' );
134	header( 'Last-Modified: ' . gmdate( 'D, d M Y H:i:s', @filemtime( $this->path ) ) . ' GMT' );
135	$this->start = 0;
136	$this->size = filesize( $this->path );
137	$this->end = $this->size - 1;
138	header( 'Accept-Ranges: 0-' . $this->end );
139
140	if ( isset( $_SERVER['HTTP_RANGE'] ) ) {
141	$c_end = $this->end;
142	list(, $range) = explode( '=', sanitize_text_field( wp_unslash( $_SERVER['HTTP_RANGE'] ) ), 2 );
143
144	if ( '-' == $range ) {
145	$c_start = $this->size - substr( $range, 1 );
146	} else {
147	$range = explode( '-', $range );
148	$c_start = $range[0];
149
150	$c_end = ( isset( $range[1] ) && is_numeric( $range[1] ) ) ? $range[1] : $c_end;
151	}
152	$c_end = ( $c_end > $this->end ) ? $this->end : $c_end;
153	if ( $c_start > $c_end \|\| $c_start > $this->size - 1 \|\| $c_end >= $this->size ) {
154	header( 'HTTP/1.1 416 Requested Range Not Satisfiable' );
155	header( "Content-Range: bytes $this->start-$this->end/$this->size" );
156	exit;
157	}
158	$this->start = $c_start;
159	$this->end = $c_end;
160	$length = $this->end - $this->start + 1;
161	header( 'HTTP/1.1 206 Partial Content' );
162	header( 'Content-Length: ' . $length );
163	header( "Content-Range: bytes $this->start-$this->end/" . $this->size );
164	header( 'Accept-Ranges: bytes' );
165	} else {
166	header( 'Content-Length: ' . $this->size );
167	}
168
169	}
170
171	/**
172	* Close currently opened stream
173	*
174	* @since 1.0.0
175	*
176	* @return void
177	*/
178	private function end() {
179	fclose( $this->stream );
180	exit;
181	}
182
183	/**
184	* Perform the streaming of calculated range
185	*
186	* @since 1.0.0
187	*
188	* @return void
189	*/
190	private function stream() {
191	$i = $this->start;
192	set_time_limit( 0 );
193	while ( ! feof( $this->stream ) && $i <= $this->end ) {
194	$bytes_to_read = $this->buffer;
195	if ( ( $i + $bytes_to_read ) > $this->end ) {
196	$bytes_to_read = $this->end - $i + 1;
197	}
198	$data = @stream_get_contents( $this->stream, $bytes_to_read, $i );
199	echo wp_kses_post( $data );
200	flush();
201	$i += $bytes_to_read;
202	}
203	}
204
205	/**
206	* Start streaming tutor video content
207	*
208	* @since 1.0.0
209	*
210	* @return void
211	*/
212	public function start() {
213	$this->open();
214	$this->set_header();
215	$this->stream();
216	$this->end();
217	}
218	}
219