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* @link https://themeum.com * @since 1.0.0 */ namespace TUTOR; if ( ! defined( 'ABSPATH' ) ) { exit; } /** * Class Video_Stream * * @since 1.0.0 */ class Video_Stream { /** * Path * * @since 1.0.0 * * @var string */ private $path = ''; /** * Stream * * @since 1.0.0 * * @var string */ private $stream = ''; /** * Buffer time * * @since 1.0.0 * * @var string */ private $buffer = 102400; /** * Start * * @since 1.0.0 * * @var int */ private $start = -1; /** * End * * @since 1.0.0 * * @var int */ private $end = -1; /** * Size * * @since 1.0.0 * * @var int */ private $size = 0; /** * Video format * * @since 1.0.0 * * @var string */ private $video_format; /** * Resolve dependencies * * @since 1.0.0 * * @param string $file_path file path. */ public function __construct( $file_path ) { $this->video_format = apply_filters( 'tutor_video_types', array( 'mp4' => 'video/mp4', 'webm' => 'video/webm', 'ogg' => 'video/ogg', ) ); $this->path = $file_path; } /** * Open stream * * @since 1.0.0 * * @return void */ private function open() { $this->stream = fopen( $this->path, 'rb' ); if ( ! ( $this->stream ) ) { die( 'Could not open stream for reading' ); } } /** * Set proper header to serve the video content * * @since 1.0.0 * * @return void */ private function set_header() { ob_get_clean(); header( 'Content-Type: ' . $this->video_format[ strtolower( pathinfo( $this->path, PATHINFO_EXTENSION ) ) ] ); header( 'Cache-Control: max-age=2592000, public' ); header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', tutor_time() + 2592000 ) . ' GMT' ); header( 'Last-Modified: ' . gmdate( 'D, d M Y H:i:s', @filemtime( $this->path ) ) . ' GMT' ); $this->start = 0; $this->size = filesize( $this->path ); $this->end = $this->size - 1; header( 'Accept-Ranges: 0-' . $this->end ); if ( isset( $_SERVER['HTTP_RANGE'] ) ) { $c_end = $this->end; list(, $range) = explode( '=', sanitize_text_field( wp_unslash( $_SERVER['HTTP_RANGE'] ) ), 2 ); if ( '-' == $range ) { $c_start = $this->size - substr( $range, 1 ); } else { $range = explode( '-', $range ); $c_start = $range[0]; $c_end = ( isset( $range[1] ) && is_numeric( $range[1] ) ) ? $range[1] : $c_end; } $c_end = ( $c_end > $this->end ) ? $this->end : $c_end; if ( $c_start > $c_end || $c_start > $this->size - 1 || $c_end >= $this->size ) { header( 'HTTP/1.1 416 Requested Range Not Satisfiable' ); header( "Content-Range: bytes $this->start-$this->end/$this->size" ); exit; } $this->start = $c_start; $this->end = $c_end; $length = $this->end - $this->start + 1; header( 'HTTP/1.1 206 Partial Content' ); header( 'Content-Length: ' . $length ); header( "Content-Range: bytes $this->start-$this->end/" . $this->size ); header( 'Accept-Ranges: bytes' ); } else { header( 'Content-Length: ' . $this->size ); } } /** * Close currently opened stream * * @since 1.0.0 * * @return void */ private function end() { fclose( $this->stream ); exit; } /** * Perform the streaming of calculated range * * @since 1.0.0 * * @return void */ private function stream() { $i = $this->start; set_time_limit( 0 ); while ( ! feof( $this->stream ) && $i <= $this->end ) { $bytes_to_read = $this->buffer; if ( ( $i + $bytes_to_read ) > $this->end ) { $bytes_to_read = $this->end - $i + 1; } $data = @stream_get_contents( $this->stream, $bytes_to_read, $i ); echo wp_kses_post( $data ); flush(); $i += $bytes_to_read; } } /** * Start streaming tutor video content * * @since 1.0.0 * * @return void */ public function start() { $this->open(); $this->set_header(); $this->stream(); $this->end(); } }