Extension:VideoSectionLink

<?php /**

These are the MediaWiki extensions we're using and/or developing. Please refer to the information on the mediawiki.org wiki for installation and usage details. Extensions here which have no corresponding mediawiki article are either not ready for use or have been superseded. You can also browse our extension code in our local Subversion repository or our GitHub mirror.

* VideoSectionLink extension - An extension to enable users to link to defined sections of video. Made with Template:Extension
*
* See http://www.mediawiki.org/wiki/Extension:VideoSectionLink for installation and usage details
*
* @package MediaWiki
* @subpackage Extensions
* @author User:Jacknz
* @copyright © 2008 User:Jacknz
* @licence GNU General Public Licence 2.0 or later
*/

if (!defined('MEDIAWIKI')) die('Not an entry point.');

define('VIDEOSECTIONLINK_VERSION', '0.0.1, 2008-10-31');

$egVideoSectionLinkMagic = 'videosection'; $wgExtensionFunctions[] = 'efSetupVideoSectionLink'; $wgHooks['LanguageGetMagic'][] = 'efVideoSectionLinkLanguageGetMagic';

$wgExtensionCredits['parserhook'][] = array( 'name' => 'VideoSectionLink', 'author' => 'User:Jack', 'description' => 'An extension to enable users to link to defined sections of video. Made with Template:Extension', 'url' => 'http://www.organicdesign.co.nz/Extension:VideoSectionLink', 'version' => VIDEOSECTIONLINK_VERSION );

class VideoSectionLink {

/** * Constructor */ function __construct() { global $wgHooks, $wgParser, $egVideoSectionLinkMagic;

# Add the parser-function $wgParser->setFunctionHook($egVideoSectionLinkMagic, array($this,'magicVideosectionlink'));

#Add the Unknownaction hook $wgHooks['UnknownAction'][] = $this; }

/** * Expand the videosection-magic */ function magicVideosectionlink (&$parser, $url = , $start = , $duration = , $ext = , $wtext = 'Click to download video') { global $egVideoSectionLinkMagic, $wgScript, $wgUploadPath, $wgUploadDirectory, $wgServer;

$text = "<a href='" . $wgServer . $wgScript . "?action=videosection&url=" . urlencode(trim($url)) . "&start=" . trim($start) . "&duration=" . trim($duration) . "&ext=" . trim($ext) ."'>" . trim($wtext) . "</a>";

# Return result with available parser flags

return array( $text, 'found' => true, 'nowiki' => false, 'noparse' => true, 'noargs' => false, 'isHTML' => true ); }

/** * Callback method executes a shell command returning the section of the movie requested */ function onUnknownAction ($action, $article) { global $wgOut, $action, $article, $wgRequest, $wgUploadDirectory;

# Get the parameters from the title # $url is the url of the originating file and can be local or Internet # $start is the start time expressed in HH:MM:SS

		# $duration is the desired duration of clip expressed in HH:MM:SS
		# $ext is the desired extension, can be mpg, avi, flv, or embed, which is an flv returned as embed code.
		

$url = $wgRequest->getText('url'); $start = $wgRequest->getText('start');

		$duration = $wgRequest->getText('duration');
		$ext = $wgRequest->getText('ext');

		# Get components of url, hash the first part 		
		$dest = preg_replace('%(.+?\.)(\w+$)%', '$1', $url);
		$movie = md5($dest);
		
		# Identify the extension for naming the decoded file
		if ($ext == "mpg" || $ext == "avi" || $ext == "flv") {
 			$movieOut = md5($start.$duration.$dest) . "." . $ext;
		}
		else {
			$ext = preg_replace('%(.+?\.)(\w+$)%', '$2', $url);
			if ($ext == "mpg" || $ext == "avi" || $ext == "flv") {
				$movieOut = md5($start.$duration.$dest) . "." . $ext;

} else { $ext = "mpg"; $movieOut = md5($start.$duration.$dest) . "." . $ext; } }

		# Execute the ffmpeg command
		if (!file_exists($movieOut)) {

$movieStr = "ffmpeg -i $url -ss $start -t $duration $wgUploadDirectory/$movieOut";

			$success = shell_exec($movieStr);

}

# Set headers to video $wgOut->disable(); header("Content-Type: video/mpeg"); $wgHfile = "Content-Disposition: attachment; filename=\"$wgUploadDirectory/$movieOut\""; header($wgHfile);

# Return the file as binary back to the client readfile("$wgUploadDirectory/$movieOut");

return true; }

/** * Needed in some versions to prevent Special:Version from breaking */ function __toString() { return __CLASS__; }

}

/**

* Called from $wgExtensionFunctions array when initialising extensions
*/

function efSetupVideoSectionLink() { global $egVideoSectionLink; $egVideoSectionLink = new VideoSectionLink();

}

/**

* Needed in MediaWiki >1.8.0 for magic word hooks to work properly
*/

function efVideoSectionLinkLanguageGetMagic(&$magicWords, $langCode = 0) { global $egVideoSectionLinkMagic; $magicWords[$egVideoSectionLinkMagic] = array($langCode, $egVideoSectionLinkMagic); return true; }