class.ilObjMediaObject.php

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<?php
/* Copyright (c) 1998-2009 ILIAS open source, Extended GPL, see docs/LICENSE */

define ("IL_MODE_ALIAS", 1);
define ("IL_MODE_OUTPUT", 2);
define ("IL_MODE_FULL", 3);

require_once("./Services/MediaObjects/classes/class.ilMediaItem.php");
include_once "./Services/Object/classes/class.ilObject.php";

class ilObjMediaObject extends ilObject
{
        var $is_alias;
        var $origin_id;
        var $id;
        var $media_items;
        var $contains_int_link;

        function ilObjMediaObject($a_id = 0)
        {
                $this->is_alias = false;
                $this->media_items = array();
                $this->contains_int_link = false;
                $this->type = "mob";
                parent::ilObject($a_id, false);
        }

        function setRefId()
        {
                $this->ilias->raiseError("Operation ilObjMedia::setRefId() not allowed.",$this->ilias->error_obj->FATAL);
        }

        function getRefId()
        {
                return false;
        }

        function putInTree()
        {
                $this->ilias->raiseError("Operation ilObjMedia::putInTree() not allowed.",$this->ilias->error_obj->FATAL);
        }

        function createReference()
        {
                $this->ilias->raiseError("Operation ilObjMedia::createReference() not allowed.",$this->ilias->error_obj->FATAL);
        }

        function setTitle($a_title)
        {
                parent::setTitle($a_title);
        }

        function getTitle()
        {
                return parent::getTitle();
        }

        public static function _exists($a_id)
        {
                global $ilDB;
                
                include_once("./Services/Link/classes/class.ilInternalLink.php");
                if (is_int(strpos($a_id, "_")))
                {
                        $a_id = ilInternalLink::_extractObjIdOfTarget($a_id);
                }
                
                return parent::_exists($a_id, false);
        }

        function delete()
        {
                if (!($this->getId() > 0))
                {
                        return;
                }

                $usages = $this->getUsages();

                if (count($usages) == 0)
                {
                        // remove directory
                        ilUtil::delDir(ilObjMediaObject::_getDirectory($this->getId()));

                        // remove thumbnail directory
                        ilUtil::delDir(ilObjMediaObject::_getThumbnailDirectory($this->getId()));

                        // delete meta data of mob
                        $this->deleteMetaData();

                        // delete media items
                        ilMediaItem::deleteAllItemsOfMob($this->getId());
                        
                        // this is just to make sure, there should be no entries left at 
                        // this point as they depend on the usage
                        self::handleQuotaUpdate($this);                 
                                        
                        // delete object
                        parent::delete();
                }
        }

        function getDescription()
        {
                return parent::getDescription();
        }

        function setDescription($a_description)
        {
                parent::setDescription($a_description);
        }

        function MDUpdateListener($a_element)
        {
                include_once 'Services/MetaData/classes/class.ilMD.php';

                switch($a_element)
                {
                        case 'General':

                                // Update Title and description
                                $md = new ilMD(0, $this->getId(), $this->getType());
                                $md_gen = $md->getGeneral();

                                if (is_object($md_gen))
                                {
                                        ilObject::_writeTitle($this->getId(),$md_gen->getTitle());
                                        $this->setTitle($md_gen->getTitle());
        
                                        foreach($md_gen->getDescriptionIds() as $id)
                                        {
                                                $md_des = $md_gen->getDescription($id);
                                                ilObject::_writeDescription($this->getId(),$md_des->getDescription());
                                                $this->setDescription($md_des->getDescription());
                                                break;
                                        }
                                }

                                break;

                        default:
                }
                return true;
        }

        function createMetaData()
        {
                include_once 'Services/MetaData/classes/class.ilMDCreator.php';

                global $ilUser;

                $md_creator = new ilMDCreator(0, $this->getId(), $this->getType());
                $md_creator->setTitle($this->getTitle());
                $md_creator->setTitleLanguage($ilUser->getPref('language'));
                $md_creator->setDescription($this->getDescription());
                $md_creator->setDescriptionLanguage($ilUser->getPref('language'));
                $md_creator->setKeywordLanguage($ilUser->getPref('language'));
                $md_creator->setLanguage($ilUser->getPref('language'));
                $md_creator->create();

                return true;
        }

        function updateMetaData()
        {
                include_once("Services/MetaData/classes/class.ilMD.php");
                include_once("Services/MetaData/classes/class.ilMDGeneral.php");
                include_once("Services/MetaData/classes/class.ilMDDescription.php");

                $md =& new ilMD(0, $this->getId(), $this->getType());
                $md_gen =& $md->getGeneral();
                $md_gen->setTitle($this->getTitle());

                // sets first description (maybe not appropriate)
                $md_des_ids =& $md_gen->getDescriptionIds();
                if (count($md_des_ids) > 0)
                {
                        $md_des =& $md_gen->getDescription($md_des_ids[0]);
                        $md_des->setDescription($this->getDescription());
                        $md_des->update();
                }
                $md_gen->update();

        }

        function deleteMetaData()
        {
                // Delete meta data
                include_once('Services/MetaData/classes/class.ilMD.php');
                $md = new ilMD(0, $this->getId(), $this->getType());
                $md->deleteAll();
        }


        function addMediaItem($a_item)
        {
                $this->media_items[] = $a_item;
        }


        function &getMediaItems()
        {
                return $this->media_items;
        }

        function &getMediaItem($a_purpose)
        {
            foreach ($this->media_items as $media_item)
                {
                    if($media_item->getPurpose() == $a_purpose)
                        {
                                return $media_item;
                        }
                }
                return false;
        }


        function removeMediaItem($a_purpose)
        {
            foreach ($this->media_items as $key => $media_item)
            {
                        if($media_item->getPurpose() == $a_purpose)
                        {
                                unset($this->media_items[$key]);
                        }
                }
                // update numbers and keys
                $i = 1;
                $media_items = array();
                foreach ($this->media_items as $media_item)
            {
                        $media_items [$i] = $media_item;
                $media_item->setMobId($this->getId());
                        $media_item->setNr($i);
                        $i++;                   
                }
                $this->media_items = $media_items;
        }
        
        function removeAllMediaItems()
        {
                $this->media_items = array();
        }


        function getMediaItemNr($a_purpose)
        {
                for($i=0; $i<count($this->media_items); $i++)
                {
                        if($this->media_items[$i]->getPurpose() == $a_purpose)
                        {
                                return $i + 1;
                        }
                }
                return false;
        }

        
        function hasFullscreenItem()
        {
                return $this->hasPurposeItem("Fullscreen");
        }
        
        function hasPurposeItem($purpose)
        {
                if(is_object($this->getMediaItem($purpose)))
                {
                        return true;
                }
                else
                {
                        return false;
                }
        }
        
        

        function read()
        {
//echo "<br>ilObjMediaObject:read";
                parent::read();

                // get media items
                ilMediaItem::_getMediaItemsOfMOb($this);
        }

        function setId($a_id)
        {
                $this->id = $a_id;
        }

        function getId()
        {
                return $this->id;
        }

        function setAlias($a_is_alias)
        {
                $this->is_alias = $a_is_alias;
        }

        function isAlias()
        {
                return $this->is_alias;
        }

        function setOriginID($a_id)
        {
                return $this->origin_id = $a_id;
        }

        function getOriginID()
        {
                return $this->origin_id;
        }

        /*
        function getimportId()
        {
                return $this->meta_data->getImportIdentifierEntryID();
        }*/


        function getImportId()
        {
                return $this->import_id;
        }

        function setImportId($a_id)
        {
                $this->import_id = $a_id;
        }

        function create($a_create_meta_data = false, $a_save_media_items = true)
        {
                parent::create();

                if (!$a_create_meta_data)
                {
                        $this->createMetaData();
                }

                if ($a_save_media_items)
                {
                        $media_items =& $this->getMediaItems();
                        for($i=0; $i<count($media_items); $i++)
                        {
                                $item =& $media_items[$i];
                                $item->setMobId($this->getId());
                                $item->setNr($i+1);
                                $item->create();
                        }
                }

                self::handleQuotaUpdate($this); 

                global $ilAppEventHandler;
                $ilAppEventHandler->raise('Services/MediaObjects',
                'create',
                array('object' => $this,
                        'obj_type' => 'mob',
                        'obj_id' => $this->getId())
                );      
        }


        function update($a_upload=false)
        {
                parent::update();
                
                if(!$a_upload)
                {
                        $this->updateMetaData();
                }
                
                ilMediaItem::deleteAllItemsOfMob($this->getId());

                // iterate all items
                $media_items =& $this->getMediaItems();
                $j = 1;
                foreach($media_items as $key => $val)
                {
                    $item =& $media_items[$key];
                        if (is_object($item))
                        {
                                $item->setMobId($this->getId());
                                $item->setNr($j);
                                if ($item->getLocationType() == "Reference")
                                {
                                        $item->extractUrlParameters();
                                }
                                $item->create();
                                $j++;
                        }
                }
                
                self::handleQuotaUpdate($this);         

                global $ilAppEventHandler;
                $ilAppEventHandler->raise('Services/MediaObjects',
                'update',
                array('object' => $this,
                        'obj_type' => 'mob',
                        'obj_id' => $this->getId())
                );            

        }
        
        protected static function handleQuotaUpdate(ilObjMediaObject $a_mob)
        {
                global $ilSetting;

                // if neither workspace nor portfolios are activated, we skip
                // the quota update here. this due to performance reasons on installations
                // that do not use workspace/portfolios, but heavily copy content.
                // in extreme cases (media object in pool and personal blog, deactivate workspace, change media object,
                // this may lead to incorrect data in the quota calculation)
                if ($ilSetting->get("disable_personal_workspace") && !$ilSetting->get('user_portfolios'))
                {
                        return;
                }

                $parent_obj_ids = array();
                foreach($a_mob->getUsages() as $item)
                {                                                                               
                        $parent_obj_id = $a_mob->getParentObjectIdForUsage($item);
                        if($parent_obj_id && 
                                !in_array($parent_obj_id, $parent_obj_ids))
                        {                                       
                                $parent_obj_ids[]= $parent_obj_id;
                        }                                               
                }
                
                // we could suppress this if object is present in a (repository) media pool
                // but this would lead to "quota-breaches" when the pool item is deleted
                // and "suddenly" all workspace owners get filesize added to their
                // respective quotas, regardless of current status
                
                include_once "Services/DiskQuota/classes/class.ilDiskQuotaHandler.php";
                ilDiskQuotaHandler::handleUpdatedSourceObject($a_mob->getType(), 
                        $a_mob->getId(),
                        ilUtil::dirSize($a_mob->getDataDirectory()), 
                        $parent_obj_ids);                                       
        }

        function _getDirectory($a_mob_id)
        {
                return ilUtil::getWebspaceDir()."/mobs/mm_".$a_mob_id;
        }
        
        function _getURL($a_mob_id)
        {
                return ilUtil::getHtmlPath(ilUtil::getWebspaceDir()."/mobs/mm_".$a_mob_id);
        }

        function _getThumbnailDirectory($a_mob_id, $a_mode = "filesystem")
        {
                return ilUtil::getWebspaceDir($a_mode)."/thumbs/mm_".$a_mob_id;
        }
        
        static function _lookupStandardItemPath($a_mob_id, $a_url_encode = false,
                $a_web = true)
        {
                return ilObjMediaObject::_lookupItemPath($a_mob_id, $a_url_encode, $a_web, "Standard");
        }
        
        static function _lookupItemPath($a_mob_id, $a_url_encode = false,
                $a_web = true, $a_purpose = "")
        {
                if ($a_purpose == "")
                {
                        $a_purpose = "Standard";
                }
                $location = ilMediaItem::_lookupLocationForMobId($a_mob_id, $a_purpose);
                if (preg_match("/https?\:/i",$location))
                    return $location;
                    
                if ($a_url_encode)
                    $location = rawurlencode($location);

                $path = ($a_web)
                        ? ILIAS_HTTP_PATH
                        : ".";
                        
                return $path."/data/".CLIENT_ID."/mobs/mm_".$a_mob_id."/".$location;
        }

        function createDirectory()
        {
                ilUtil::createDirectory(ilObjMediaObject::_getDirectory($this->getId()));
        }

        function _createThumbnailDirectory($a_obj_id)
        {
                ilUtil::createDirectory(ilUtil::getWebspaceDir()."/thumbs");
                ilUtil::createDirectory(ilUtil::getWebspaceDir()."/thumbs/mm_".$a_obj_id);
        }
        
        function getFilesOfDirectory($a_subdir = "")
        {
                $a_subdir = str_replace("..", "", $a_subdir);
                $dir = ilObjMediaObject::_getDirectory($this->getId());
                if ($a_subdir != "")
                {
                        $dir.= "/".$a_subdir;
                }
                
                $files = array();
                if (is_dir($dir))
                {
                        $entries = ilUtil::getDir($dir);
                        foreach ($entries as $e)
                        {
                                if (is_file($dir."/".$e["entry"]) && $e["entry"] != "." && $e["entry"] != "..")
                                {
                                        $files[] = $e["entry"];
                                }
                        }
                }
 
                return $files;
        }
        

        function getXML($a_mode = IL_MODE_FULL, $a_inst = 0)
        {
                global $ilUser;
                
                // TODO: full implementation of all parameters
//echo "-".$a_mode."-";
                switch ($a_mode)
                {
                        case IL_MODE_ALIAS:
                                $xml = "<MediaObject>";
                                $xml .= "<MediaAlias OriginId=\"il__mob_".$this->getId()."\"/>";
                                $media_items =& $this->getMediaItems();
                                for($i=0; $i<count($media_items); $i++)
                                {
                                        $item =& $media_items[$i];
                                        $xml .= "<MediaAliasItem Purpose=\"".$item->getPurpose()."\">";

                                        // Layout
                                        $width = ($item->getWidth() != "")
                                                ? "Width=\"".$item->getWidth()."\""
                                                : "";
                                        $height = ($item->getHeight() != "")
                                                ? "Height=\"".$item->getHeight()."\""
                                                : "";
                                        $halign = ($item->getHAlign() != "")
                                                ? "HorizontalAlign=\"".$item->getHAlign()."\""
                                                : "";
                                        $xml .= "<Layout $width $height $halign />";

                                        // Caption
                                        if ($item->getCaption() != "")
                                        {
                                                $xml .= "<Caption Align=\"bottom\">".
                                                        str_replace("&", "&amp;", $item->getCaption())."</Caption>";
                                        }

                                        // Text Representation
                                        if ($item->getTextRepresentation() != "")
                                        {
                                                $xml .= "<TextRepresentation>".
                                                        str_replace("&", "&amp;", $item->getTextRepresentation())."</TextRepresentation>";
                                        }

                                        // Parameter
                                        $parameters = $item->getParameters();
                                        foreach ($parameters as $name => $value)
                                        {
                                                $xml .= "<Parameter Name=\"$name\" Value=\"$value\"/>";
                                        }
                                        $xml .= $item->getMapAreasXML();
                                        $xml .= "</MediaAliasItem>";
                                }
                                break;

                        // for output we need technical sections of meta data
                        case IL_MODE_OUTPUT:

                                // get first technical section
//                              $meta =& $this->getMetaData();
                                $xml = "<MediaObject Id=\"il__mob_".$this->getId()."\">";

                                $media_items =& $this->getMediaItems();
                                for($i=0; $i<count($media_items); $i++)
                                {
                                        $item =& $media_items[$i];

                                        $xml .= "<MediaItem Purpose=\"".$item->getPurpose()."\">";

                                        // Location
                                        $xml.= "<Location Type=\"".$item->getLocationType()."\">".
                                                $this->handleAmps($item->getLocation())."</Location>";

                                        // Format
                                        $xml.= "<Format>".$item->getFormat()."</Format>";

                                        // Layout
                                        $width = ($item->getWidth() != "")
                                                ? "Width=\"".$item->getWidth()."\""
                                                : "";
                                        $height = ($item->getHeight() != "")
                                                ? "Height=\"".$item->getHeight()."\""
                                                : "";
                                        $halign = ($item->getHAlign() != "")
                                                ? "HorizontalAlign=\"".$item->getHAlign()."\""
                                                : "";
                                        $xml .= "<Layout $width $height $halign />";

                                        // Caption
                                        if ($item->getCaption() != "")
                                        {
                                                $xml .= "<Caption Align=\"bottom\">".
                                                        str_replace("&", "&amp;", $item->getCaption())."</Caption>";
                                        }
                                        
                                        // Text Representation
                                        if ($item->getTextRepresentation() != "")
                                        {
                                                $xml .= "<TextRepresentation>".
                                                        str_replace("&", "&amp;", $item->getTextRepresentation())."</TextRepresentation>";
                                        }

                                        // Parameter
                                        $parameters = $item->getParameters();
                                        foreach ($parameters as $name => $value)
                                        {
                                                $xml .= "<Parameter Name=\"$name\" Value=\"$value\"/>";
                                        }
                                        $xml .= $item->getMapAreasXML();
                                        
                                        // Subtitles
                                        if ($item->getPurpose() == "Standard")
                                        {
                                                $srts = $this->getSrtFiles();
                                                foreach ($srts as $srt)
                                                {
                                                        $def = "";
                                                        $meta_lang = "";
                                                        if ($ilUser->getLanguage() != $meta_lang &&
                                                                $ilUser->getLanguage() == $srt["language"])
                                                        {
                                                                $def = ' Default="true" ';
                                                        }
                                                        $xml .= "<Subtitle File=\"".$srt["full_path"].
                                                                "\" Language=\"".$srt["language"]."\" ".$def."/>";
                                                }
                                        }
                                        $xml .= "</MediaItem>";
                                }
                                break;

                        // full xml for export
                        case IL_MODE_FULL:

//                              $meta =& $this->getMetaData();
                                $xml = "<MediaObject>";

                                // meta data
                                include_once("Services/MetaData/classes/class.ilMD2XML.php");
                                $md2xml = new ilMD2XML(0, $this->getId(), $this->getType());
                                $md2xml->setExportMode(true);
                                $md2xml->startExport();
                                $xml.= $md2xml->getXML();

                                $media_items =& $this->getMediaItems();
                                for($i=0; $i<count($media_items); $i++)
                                {
                                        $item =& $media_items[$i];
                                        
                                        // highlight mode                                       
                                        $xml .= "<MediaItem Purpose=\"".$item->getPurpose()."\">";

                                        // Location
                                        $xml.= "<Location Type=\"".$item->getLocationType()."\">".
                                                $this->handleAmps($item->getLocation())."</Location>";

                                        // Format
                                        $xml.= "<Format>".$item->getFormat()."</Format>";

                                        // Layout
                                        $width = ($item->getWidth() != "")
                                                ? "Width=\"".$item->getWidth()."\""
                                                : "";
                                        $height = ($item->getHeight() != "")
                                                ? "Height=\"".$item->getHeight()."\""
                                                : "";
                                        $halign = ($item->getHAlign() != "")
                                                ? "HorizontalAlign=\"".$item->getHAlign()."\""
                                                : "";
                                        $xml .= "<Layout $width $height $halign />";

                                        // Caption
                                        if ($item->getCaption() != "")
                                        {
                                                $xml .= "<Caption Align=\"bottom\">".
                                                        str_replace("&", "&amp;", $item->getCaption())."</Caption>";
                                        }
                                        
                                        // Text Representation
                                        if ($item->getTextRepresentation() != "")
                                        {
                                                $xml .= "<TextRepresentation>".
                                                        str_replace("&", "&amp;", $item->getTextRepresentation())."</TextRepresentation>";
                                        }

                                        // Parameter
                                        $parameters = $item->getParameters();
                                        foreach ($parameters as $name => $value)
                                        {
                                                $xml .= "<Parameter Name=\"$name\" Value=\"$value\"/>";
                                        }
                                        $xml .= $item->getMapAreasXML(true, $a_inst);
                                        $xml .= "</MediaItem>";
                                }
                                break;
                }
                $xml .= "</MediaObject>";
                return $xml;
        }

        function handleAmps($a_str)
        {
                $a_str = str_replace("&amp;", "&", $a_str);
                $a_str = str_replace("&", "&amp;", $a_str);
                return $a_str;
        }
        
        function exportXML(&$a_xml_writer, $a_inst = 0)
        {
                $a_xml_writer->appendXML($this->getXML(IL_MODE_FULL, $a_inst));
        }


        function exportFiles($a_target_dir)
        {
                $subdir = "il_".IL_INST_ID."_mob_".$this->getId();
                ilUtil::makeDir($a_target_dir."/objects/".$subdir);

                $mobdir = ilUtil::getWebspaceDir()."/mobs/mm_".$this->getId();
                ilUtil::rCopy($mobdir, $a_target_dir."/objects/".$subdir);
//echo "from:$mobdir:to:".$a_target_dir."/objects/".$subdir.":<br>";
        }

        function exportMediaFullscreen($a_target_dir, $pg_obj)
        {
                $subdir = "il_".IL_INST_ID."_mob_".$this->getId();
                $a_target_dir = $a_target_dir."/objects/".$subdir;
                ilUtil::makeDir($a_target_dir);
                $tpl = new ilTemplate("tpl.fullscreen.html", true, true, "Modules/LearningModule");
                $tpl->setCurrentBlock("ilMedia");

                //$int_links = $page_object->getInternalLinks();
                $med_links = ilMediaItem::_getMapAreasIntLinks($this->getId());

                // @todo
                //$link_xml = $this->getLinkXML($med_links, $this->getLayoutLinkTargets());

                require_once("./Services/MediaObjects/classes/class.ilObjMediaObject.php");
                //$media_obj = new ilObjMediaObject($_GET["mob_id"]);
                require_once("./Services/COPage/classes/class.ilPageObject.php");

                $xml = "<dummy>";
                // todo: we get always the first alias now (problem if mob is used multiple
                // times in page)
                $xml.= $pg_obj->getMediaAliasElement($this->getId());
                $xml.= $this->getXML(IL_MODE_OUTPUT);
                //$xml.= $link_xml;
                $xml.="</dummy>";
                
                //die(htmlspecialchars($xml));

                $xsl = file_get_contents("./Services/COPage/xsl/page.xsl");
                $args = array( '/_xml' => $xml, '/_xsl' => $xsl );
                $xh = xslt_create();

                //echo "<b>XML:</b>".htmlentities($xml);
                // determine target frames for internal links
                $wb_path = "";
                $enlarge_path = "";
                $params = array ('mode' => "fullscreen", 'enlarge_path' => $enlarge_path,
                        'link_params' => "ref_id=".$_GET["ref_id"],'fullscreen_link' => "",
                        'ref_id' => $_GET["ref_id"], 'webspace_path' => $wb_path);
                $output = xslt_process($xh,"arg:/_xml","arg:/_xsl",NULL,$args, $params);
                //echo xslt_error($xh);
                xslt_free($xh);

                // unmask user html
                include_once("./Services/MediaObjects/classes/class.ilPlayerUtil.php");
                $tpl->setVariable("LOCATION_CONTENT_STYLESHEET", "../../css/style.css");
                $tpl->setVariable("LOCATION_STYLESHEET", "../../css/system.css");
                $tpl->setVariable("MEDIA_CONTENT", $output);
                $output = $tpl->get();
                //$output = preg_replace("/\/mobs\/mm_(\d+)\/([^\"]+)/i","$2",$output);
                $output = preg_replace("/mobs\/mm_(\d+)\/([^\"]+)/i","$2",$output);
                $output = preg_replace("/\.\/Services\/MediaObjects\/flash_mp3_player/i","../../players",$output);
                $output = preg_replace("/\.\/".str_replace("/", "\/", ilPlayerUtil::getFlashVideoPlayerDirectory())."/i","../../players",$output);
                $output = preg_replace("/file=..\/..\/..\//i","file=../objects/".$subdir."/",$output);
                //die(htmlspecialchars($output));
                fwrite(fopen($a_target_dir.'/fullscreen.html','w'), $output );
        }

        function modifyExportIdentifier($a_tag, $a_param, $a_value)
        {
                if ($a_tag == "Identifier" && $a_param == "Entry")
                {
                        $a_value = ilUtil::insertInstIntoID($a_value);
                }

                return $a_value;
        }


        // EDIT METHODS: these methods act on the media alias in the dom

        function setContainsIntLink($a_contains_link)
        {
                $this->contains_int_link = $a_contains_link;
        }

        function containsIntLink()
        {
                return $this->contains_int_link;
        }

        function _deleteAllUsages($a_type, $a_id, $a_usage_hist_nr = 0, $a_lang = "-")
        {
                global $ilDB;
                
                $and_hist = "";
                if ($a_usage_hist_nr !== false)
                {
                        $and_hist = " AND usage_hist_nr = ".$ilDB->quote($a_usage_hist_nr, "integer");
                }
                
                $mob_ids = array();
                $set = $ilDB->query("SELECT id FROM mob_usage".
                        " WHERE usage_type = ".$ilDB->quote($a_type, "text").
                        " AND usage_id = ".$ilDB->quote($a_id, "integer").
                        " AND usage_lang = ".$ilDB->quote($a_lang, "text").
                        $and_hist);
                while($row = $ilDB->fetchAssoc($set))
                {
                        $mob_ids[] = $row["id"];
                }
                
                $q = "DELETE FROM mob_usage WHERE usage_type = ".
                        $ilDB->quote($a_type, "text").
                        " AND usage_id= ".$ilDB->quote($a_id, "integer").
                        " AND usage_lang = ".$ilDB->quote($a_lang, "text").
                        $and_hist;
                $ilDB->manipulate($q);
                
                foreach($mob_ids as $mob_id)
                {
                        self::handleQuotaUpdate(new self($mob_id));     
                }
        }

        function _getMobsOfObject($a_type, $a_id, $a_usage_hist_nr = 0, $a_lang = "-")
        {
                global $ilDB;

                $lstr = "";
                if ($a_lang != "")
                {
                        $lstr = " AND usage_lang = ".$ilDB->quote($a_lang, "text");
                }
                $hist_str = "";
                if ($a_usage_hist_nr !== false)
                {
                        $hist_str = " AND usage_hist_nr = ".$ilDB->quote($a_usage_hist_nr, "integer");
                }

                $q = "SELECT * FROM mob_usage WHERE ".
                        "usage_type = ".$ilDB->quote($a_type, "text")." AND ".
                        "usage_id = ".$ilDB->quote($a_id, "integer").
                        $lstr.$hist_str;
                $mobs = array();
                $mob_set = $ilDB->query($q);
                while($mob_rec = $ilDB->fetchAssoc($mob_set))
                {
                        if (ilObject::_lookupType($mob_rec["id"]) == "mob")
                        {
                                $mobs[$mob_rec["id"]] = $mob_rec["id"];
                        }
                }

                return $mobs;
        }

        function _saveUsage($a_mob_id, $a_type, $a_id, $a_usage_hist_nr = 0, $a_lang = "-")
        {
                global $ilDB;

                $ilDB->replace("mob_usage",
                        array(
                                "id" => array("integer", (int) $a_mob_id),
                                "usage_type" => array("text", $a_type),
                                "usage_id" => array("integer", $a_id),
                                "usage_lang" => array("text", $a_lang),
                                "usage_hist_nr" => array("integer", (int) $a_usage_hist_nr)
                                ),
                        array()
                        );

                self::handleQuotaUpdate(new self($a_mob_id));           
        }

        function _removeUsage($a_mob_id, $a_type, $a_id, $a_usage_hist_nr = 0, $a_lang = "-")
        {
                global $ilDB;
                
                $q = "DELETE FROM mob_usage WHERE ".
                        " id = ".$ilDB->quote((int) $a_mob_id, "integer")." AND ".
                        " usage_type = ".$ilDB->quote($a_type, "text")." AND ".
                        " usage_id = ".$ilDB->quote((int) $a_id, "integer")." AND ".
                        " usage_lang = ".$ilDB->quote($a_lang, "text")." AND ".
                        " usage_hist_nr = ".$ilDB->quote((int) $a_usage_hist_nr, "integer");
                $ilDB->manipulate($q);
                
                self::handleQuotaUpdate(new self($a_mob_id));   
        }

        function getUsages($a_include_history = true)
        {
                return $this->lookupUsages($this->getId(), $a_include_history);
        }
        
        function lookupUsages($a_id, $a_include_history = true)
        {
                global $ilDB;

                $hist_str = "";
                if ($a_include_history)
                {
                        $hist_str = ", usage_hist_nr";
                }
                
                // get usages in pages
                $q = "SELECT DISTINCT usage_type, usage_id, usage_lang".$hist_str." FROM mob_usage WHERE id = ".
                        $ilDB->quote($a_id, "integer");

                if (!$a_include_history)
                {
                        $q.= " AND usage_hist_nr = ".$ilDB->quote(0, "integer");
                }
                
                $us_set = $ilDB->query($q);
                $ret = array();
                while($us_rec = $ilDB->fetchAssoc($us_set))
                {
                        $ut = "";
                        if(is_int(strpos($us_rec["usage_type"], ":")))
                        {
                                $us_arr = explode(":", $us_rec["usage_type"]);
                                $ut = $us_arr[1];
                                $ct = $us_arr[0];
                        }

                        // check whether page exists
                        $skip = false;
                        if ($ut == "pg")
                        {
                                include_once("./Services/COPage/classes/class.ilPageObject.php");
                                if (!ilPageObject::_exists($ct, $us_rec["usage_id"]))
                                {
                                        $skip = true;
                                }
                        }
                                
                        if (!$skip)
                        {
                                $ret[] = array("type" => $us_rec["usage_type"],
                                        "id" => $us_rec["usage_id"],
                                        "lang" => $us_rec["usage_lang"],
                                        "hist_nr" => $us_rec["usage_hist_nr"]);
                        }
                }

                // get usages in media pools
                $q = "SELECT DISTINCT mep_id FROM mep_tree JOIN mep_item ON (child = obj_id) WHERE mep_item.foreign_id = ".
                        $ilDB->quote($a_id, "integer")." AND mep_item.type = ".$ilDB->quote("mob", "text");
                $us_set = $ilDB->query($q);
                while($us_rec = $ilDB->fetchAssoc($us_set))
                {
                        $ret[] = array("type" => "mep",
                                "id" => $us_rec["mep_id"]);
                }
                
                // get usages in news items (media casts)
                include_once("./Services/News/classes/class.ilNewsItem.php");
                $news_usages = ilNewsItem::_lookupMediaObjectUsages($a_id);
                foreach($news_usages as $nu)
                {
                        $ret[] = $nu;
                }
                

                // get usages in map areas
                $q = "SELECT DISTINCT mob_id FROM media_item it, map_area area ".
                        " WHERE area.item_id = it.id ".
                        " AND area.link_type = ".$ilDB->quote("int", "text")." ".
                        " AND area.target = ".$ilDB->quote("il__mob_".$a_id, "text");
                $us_set = $ilDB->query($q);
                while($us_rec = $ilDB->fetchAssoc($us_set))
                {
                        $ret[] = array("type" => "map",
                                "id" => $us_rec["mob_id"]);
                }

                // get usages in personal clipboards
                $users = ilObjUser::_getUsersForClipboadObject("mob", $a_id);
                foreach ($users as $user)
                {
                        $ret[] = array("type" => "clip",
                                "id" => $user);
                }

                return $ret;
        }

        function getParentObjectIdForUsage($a_usage, $a_include_all_access_obj_ids = false)
        {
                if(is_int(strpos($a_usage["type"], ":")))
                {
                        $us_arr = explode(":", $a_usage["type"]);
                        $type = $us_arr[1];
                        $cont_type = $us_arr[0];
                }
                else
                {
                        $type = $a_usage["type"];
                }
                
                $id = $a_usage["id"];
                $obj_id = false;
                
                switch($type)
                {
                        // RTE / tiny mce
                        case "html":            
                                
                                switch($cont_type)
                                {                                       
                                        case "qpl":
                                                // Question Pool *Question* Text (Test)
                                                include_once("./Modules/TestQuestionPool/classes/class.assQuestion.php");
                                                $qinfo = assQuestion::_getQuestionInfo($id);
                                                if ($qinfo["original_id"] > 0)
                                                {
                                                        include_once("./Modules/Test/classes/class.ilObjTest.php");
                                                        $obj_id = ilObjTest::_lookupTestObjIdForQuestionId($id);        // usage in test
                                                }
                                                else
                                                {
                                                        $obj_id = $qinfo["obj_fi"];             // usage in pool
                                                }                                                                                               
                                                break;
                                                
                                        case "spl":                                             
                                                // Question Pool *Question* Text (Survey)
                                                include_once("./Modules/SurveyQuestionPool/classes/class.SurveyQuestion.php");
                                                $quest = SurveyQuestion::_instanciateQuestion($id);
                                                if ($quest)
                                                {
                                                        $parent_id = $quest->getObjId();                                                        
                                                        
                                                        // pool question copy - find survey, do not use pool itself
                                                        if ($quest->getOriginalId() &&
                                                                ilObject::_lookupType($parent_id) == "spl")
                                                        {                                                                                       
                                                                $obj_id = SurveyQuestion::_lookupSurveyObjId($id);                                                      
                                                        }       
                                                        // original question (in pool or survey)
                                                        else
                                                        {
                                                                $obj_id = $parent_id;
                                                        }                                                                                                       
                                                        
                                                        unset($quest);
                                                }
                                                break;
                                                
                                        case "exca":
                                                // Exercise assignment
                                                $returned_pk = $a_usage['id'];                                  
                                                // we are just checking against exercise object
                                                include_once 'Modules/Exercise/classes/class.ilObjExercise.php';
                                                $obj_id = ilObjExercise::lookupExerciseIdForReturnedId($returned_pk);                   
                                                break;
                                        
                                        case "frm":             
                                                // Forum
                                                $post_pk = $a_usage['id'];
                                                include_once 'Modules/Forum/classes/class.ilForumPost.php';
                                                include_once 'Modules/Forum/classes/class.ilForum.php';
                                                $oPost = new ilForumPost($post_pk);                                     
                                                $frm_pk =  $oPost->getForumId();
                                                $obj_id = ilForum::_lookupObjIdForForumId($frm_pk);
                                                break;
                                        
                                        // temporary items (per user)
                                        case "frm~":
                                        case "exca~":
                                                $obj_id = $a_usage['id'];
                                                break;          
                                        
                                        // "old" category pages
                                        case "cat":                                             
                                        // InfoScreen Text
                                        case "tst":
                                        case "svy":
                                        // data collection
                                        case "dcl":
                                                $obj_id = $id;
                                                break;                                  
                                }
                                break;
                                
                        // page editor
                        case "pg":
                                
                                switch($cont_type)
                                {
                                        // question feedback // parent obj id is q id
                                        case "qfbg":
                                                include_once('./Services/COPage/classes/class.ilPageObject.php');
                                                $id = ilPageObject::lookupParentId($id, 'qfbg');
                                                // note: no break here, we only altered the $id to the question id

                                        case "qpl":
                                                // Question Pool Question Pages
                                                include_once("./Modules/TestQuestionPool/classes/class.assQuestion.php");
                                                $qinfo = assQuestion::_getQuestionInfo($id);
                                                if ($qinfo["original_id"] > 0)
                                                {
                                                        include_once("./Modules/Test/classes/class.ilObjTest.php");
                                                        $obj_id = ilObjTest::_lookupTestObjIdForQuestionId($id);        // usage in test
                                                }
                                                else
                                                {
                                                        $obj_id = $qinfo["obj_fi"];             // usage in pool
                                                }
                                                if ($obj_id == 0)       // this is the case, if question is in learning module -> get lm id
                                                {
                                                        include_once("./Services/COPage/classes/class.ilPCQuestion.php");
                                                        $pinfo = ilPCQuestion::_getPageForQuestionId($id, "lm");
                                                        if ($pinfo && $pinfo["parent_type"] == "lm")
                                                        {
                                                                include_once("./Modules/LearningModule/classes/class.ilLMObject.php");
                                                                $obj_id = ilLMObject::_lookupContObjID($pinfo["page_id"]);
                                                        }
                                                        $pinfo = ilPCQuestion::_getPageForQuestionId($id, "sahs");
                                                        if ($pinfo && $pinfo["parent_type"] == "sahs")
                                                        {
                                                                include_once("./Modules/SCORM2004/classes/class.ilSCORM2004Node.php");
                                                                $obj_id = ilSCORM2004Node::_lookupSLMID($pinfo["page_id"]);
                                                        }
                                                }
                                                break;
                                                
                                        case "lm":
                                        case "dbk":
                                                // learning modules
                                                include_once("./Modules/LearningModule/classes/class.ilLMObject.php");
                                                $obj_id = ilLMObject::_lookupContObjID($id);
                                                break;
                                
                                        case "gdf":
                                                // glossary definition                                          
                                                include_once("./Modules/Glossary/classes/class.ilGlossaryDefinition.php");
                                                include_once("./Modules/Glossary/classes/class.ilGlossaryTerm.php");
                                                $term_id = ilGlossaryDefinition::_lookupTermId($id);
                                                $obj_id = ilGlossaryTerm::_lookGlossaryID($term_id);
                                                break;
                                        
                                        case "wpg":
                                                // wiki page
                                                include_once 'Modules/Wiki/classes/class.ilWikiPage.php';
                                                $obj_id = ilWikiPage::lookupObjIdByPage($id);
                                                break;
                                        
                                        case "sahs":
                                                // sahs page                                            
                                                // can this implementation be used for other content types, too?
                                                include_once('./Services/COPage/classes/class.ilPageObject.php');
                                                $obj_id = ilPageObject::lookupParentId($id, 'sahs');
                                                break;
                                        
                                        case "prtf":
                                                // portfolio
                                                include_once "Modules/Portfolio/classes/class.ilPortfolioPage.php";                                     
                                                $obj_id = ilPortfolioPage::findPortfolioForPage($id);
                                                break;
                                        
                                        case "prtt":
                                                // portfolio template
                                                include_once "Modules/Portfolio/classes/class.ilPortfolioTemplatePage.php";                                     
                                                $obj_id = ilPortfolioTemplatePage::findPortfolioForPage($id);
                                                break;
                                        
                                        case "blp":
                                                // blog
                                                include_once('./Services/COPage/classes/class.ilPageObject.php');
                                                $obj_id = ilPageObject::lookupParentId($id, 'blp');
                                                break;
                                        
                                        case "impr":
                                                // imprint page - always id 1
                                                // fallthrough
                                                
                                        case "crs":
                                        case "grp":
                                        case "cat":
                                        case "fold":
                                        case "root":
                                        case "cont":
                                        case "cstr":
                                                // repository pages
                                                $obj_id = $id;
                                                break;
                                }                               
                                break;
                                
                        // Media Pool
                        case "mep":
                                $obj_id = $id;
                                break;

                        // News Context Object (e.g. MediaCast)
                        case "news":
                                include_once("./Services/News/classes/class.ilNewsItem.php");
                                $obj_id = ilNewsItem::_lookupContextObjId($id);
                                break;
                }
                
                return $obj_id;
        }
        
        function _resizeImage($a_file, $a_width, $a_height, $a_constrain_prop = false)
        {
                $file_path = pathinfo($a_file);
                $location = substr($file_path["basename"],0,strlen($file_path["basename"]) -
                        strlen($file_path["extension"]) - 1)."_".
                        $a_width."_".
                        $a_height.".".$file_path["extension"];
                $target_file = $file_path["dirname"]."/".
                        $location;
                ilUtil::resizeImage($a_file, $target_file,
                        (int) $a_width, (int) $a_height, $a_constrain_prop);

                return $location;
        }

        static function getMimeType($a_file)
        {
                include_once("./Services/Utilities/classes/class.ilMimeTypeUtil.php");
                $mime = ilMimeTypeUtil::getMimeType($a_file);
                return $mime;
        }

        static function _determineWidthHeight($a_def_width, $a_def_height, $a_format, $a_type,
                $a_file, $a_reference, $a_constrain_proportions, $a_use_original,
                $a_user_width, $a_user_height)
        {
                global $lng;
                
                // determine width and height of known image types
                $width = $a_def_width;
                $height = $a_def_height;
                $info = "";
                
                if ($a_format == "audio/mpeg")
                {
                        $width = 300;
                        $height = 20;
                }
                
                if (ilUtil::deducibleSize($a_format))
                {
                        include_once("./Services/MediaObjects/classes/class.ilMediaImageUtil.php");
                        if ($a_type == "File")
                        {
                                $size = ilMediaImageUtil::getImageSize($a_file);
                        }
                        else
                        {
                                $size = ilMediaImageUtil::getImageSize($a_reference);
                        }
                }

                if ($a_use_original)
                {
                        if ($size[0] > 0 && $size[1] > 0)
                        {
                                $width = $size[0];
                                $height = $size[1];
                        }
                        else
                        {
                                $info = $lng->txt("cont_could_not_determine_resource_size");
                        }
                }
                else
                {
                        $w = (int) $a_user_width;
                        $h = (int) $a_user_height;
                        $width = $w;
                        $height = $h;
//echo "<br>C-$width-$height-";
                        if (ilUtil::deducibleSize($a_format) && $a_constrain_proportions)
                        {
                                if ($size[0] > 0 && $size[1] > 0)
                                {
                                        if ($w > 0)
                                        {
                                                $wr = $size[0] / $w;
                                        }
                                        if ($h > 0)
                                        {
                                                $hr = $size[1] / $h;
                                        }
//echo "<br>+".$wr."+".$size[0]."+".$w."+";
//echo "<br>+".$hr."+".$size[1]."+".$h."+";
                                        $r = max($wr, $hr);
                                        if ($r > 0)
                                        {
                                                $width = (int) ($size[0]/$r);
                                                $height = (int) ($size[1]/$r);
                                        }
                                }
                        }
//echo "<br>D-$width-$height-";
                }
//echo "<br>E-$width-$height-";
                return array("width" => $width, "height" => $height, "info" => $info);
        }

        static function _getSimpleMimeTypes()
        {
                return array("image/x-ms-bmp", "image/gif", "image/jpeg", "image/x-portable-bitmap",
                        "image/png", "image/psd", "image/tiff", "application/pdf");
        }
        
        function getDataDirectory()
        {
                return ilUtil::getWebspaceDir()."/mobs/mm_".$this->getId();
        }

        static function _useAutoStartParameterOnly($a_loc, $a_format)
        {
                $lpath = pathinfo($a_loc);
                if ($lpath["extension"] == "mp3" && $a_format == "audio/mpeg")
                {
                        return true;
                }
                if ($lpath["extension"] == "flv")
                {
                        return true;
                }
                if (in_array($a_format, array("video/mp4", "video/webm")))
                {
                        return true;
                }
                return false;
        }

        function &_saveTempFileAsMediaObject($name, $tmp_name, $upload = TRUE)
        {
                // create dummy object in db (we need an id)
                $media_object = new ilObjMediaObject();
                $media_object->setTitle($name);
                $media_object->setDescription("");
                $media_object->create();

                // determine and create mob directory, move uploaded file to directory
                $media_object->createDirectory();
                $mob_dir = ilObjMediaObject::_getDirectory($media_object->getId());

                $media_item =& new ilMediaItem();
                $media_object->addMediaItem($media_item);
                $media_item->setPurpose("Standard");

                $file = $mob_dir."/".$name;
                if ($upload)
                {
                        ilUtil::moveUploadedFile($tmp_name,$name, $file);
                }
                else
                {
                        copy($tmp_name, $file);
                }
                // get mime type
                $format = ilObjMediaObject::getMimeType($file);
                $location = $name;
                // set real meta and object data
                $media_item->setFormat($format);
                $media_item->setLocation($location);
                $media_item->setLocationType("LocalFile");
                $media_object->setTitle($name);
                $media_object->setDescription($format);

                if (ilUtil::deducibleSize($format))
                {
                        include_once("./Services/MediaObjects/classes/class.ilMediaImageUtil.php");
                        $size = ilMediaImageUtil::getImageSize($file);
                        $media_item->setWidth($size[0]);
                        $media_item->setHeight($size[1]);
                }
                $media_item->setHAlign("Left");

                self::renameExecutables($mob_dir);
                include_once("./Services/MediaObjects/classes/class.ilMediaSvgSanitizer.php");
                ilMediaSvgSanitizer::sanitizeDir($mob_dir);     // see #20339

                $media_object->update();

                return $media_object;
        }
        
        function uploadAdditionalFile($a_name, $tmp_name, $a_subdir = "")
        {
                $a_subdir = str_replace("..", "", $a_subdir);
                $dir = $mob_dir = ilObjMediaObject::_getDirectory($this->getId());
                if ($a_subdir != "")
                {
                        $dir.= "/".$a_subdir;
                }
                ilUtil::makeDirParents($dir);
                ilUtil::moveUploadedFile($tmp_name, $a_name, $dir."/".$a_name);
                self::renameExecutables($mob_dir);
                include_once("./Services/MediaObjects/classes/class.ilMediaSvgSanitizer.php");
                ilMediaSvgSanitizer::sanitizeDir($mob_dir);     // see #20339

        }
        
        function uploadSrtFile($a_tmp_name, $a_language)
        {
                if (is_file($a_tmp_name) && $a_language != "")
                {
                        $this->uploadAdditionalFile("subtitle_".$a_language.".srt", $a_tmp_name, "srt");
                        return true;
                }
                return false;
        }
        
        function getSrtFiles()
        {
                $srt_dir = ilObjMediaObject::_getDirectory($this->getId())."/srt";
                
                if (!is_dir($srt_dir))
                {
                        return array();
                }
                
                $items = ilUtil::getDir($srt_dir);

                $srt_files = array();
                foreach ($items as $i)
                {
                        if (!in_array($i["entry"], array(".", "..")) && $i["type"] == "file")
                        {
                                $name = explode(".", $i["entry"]);
                                if ($name[1] == "srt" && substr($name[0], 0, 9) == "subtitle_")
                                {
                                        $srt_files[] = array("file" => $i["entry"],
                                                "full_path" => "srt/".$i["entry"], "language" => substr($name[0], 9, 2));
                                }
                        }
                }
                
                return $srt_files;
        }

        function makeThumbnail($a_file, $a_thumbname, $a_format = "png",
                $a_size = "80")
        {
                $m_dir = ilObjMediaObject::_getDirectory($this->getId());
                $t_dir = ilObjMediaObject::_getThumbnailDirectory($this->getId());
                self::_createThumbnailDirectory($this->getId());
                ilUtil::convertImage($m_dir."/".$a_file,
                        $t_dir."/".$a_thumbname, $a_format, $a_size);
        }
        
        static function getThumbnailPath($a_mob_id, $a_thumbname)
        {
                $t_dir = ilObjMediaObject::_getThumbnailDirectory($a_mob_id);
                return $t_dir."/".$a_thumbname;
        }
        
        
        function removeAdditionalFile($a_file)
        {
                $file = str_replace("..", "", $a_file);
                $file = ilObjMediaObject::_getDirectory($this->getId())."/".$file;
                if (is_file($file))
                {
                        unlink($file);
                }
        }
        
        
        function getLinkedMediaObjects($a_ignore = "")
        {
                $linked = array();
                
                if (!is_array($a_ignore))
                {
                        $a_ignore = array();
                }
                
                // get linked media objects (map areas)
                $med_items = $this->getMediaItems();

                foreach($med_items as $med_item)
                {
                        $int_links = ilMapArea::_getIntLinks($med_item->getId());
                        foreach ($int_links as $k => $int_link)
                        {
                                if ($int_link["Type"] == "MediaObject")
                                {
                                        include_once("./Services/Link/classes/class.ilInternalLink.php");
                                        $l_id = ilInternalLink::_extractObjIdOfTarget($int_link["Target"]);
                                        if (ilObject::_exists($l_id))
                                        {
                                                if (!in_array($l_id, $linked) && 
                                                        !in_array($l_id, $a_ignore))
                                                {
                                                        $linked[] = $l_id;
                                                }
                                        }
                                }
                        }
                }
//var_dump($linked);
                return $linked;
        }
        
        static function getRestrictedFileTypes()
        {
                return array_filter(self::getAllowedFileTypes(), function ($v) {
                        return !in_array($v, self::getForbiddenFileTypes());
                });
        }
        
        static function getForbiddenFileTypes()
        {
                $mset = new ilSetting("mobs");
                if (trim($mset->get("black_list_file_types")) == "")
                {
                        return array();
                }
                return array_map(function ($v)
                        {
                                return strtolower(trim($v));
                        },
                        explode(",", $mset->get("black_list_file_types")));
        }

        static function getAllowedFileTypes()
        {
                $mset = new ilSetting("mobs");
                if (trim($mset->get("restricted_file_types")) == "")
                {
                        return array();
                }
                return array_map(function ($v)
                {
                                return strtolower(trim($v));
                },
                        explode(",", $mset->get("restricted_file_types")));
        }
        
        static function isTypeAllowed($a_type)
        {
                if (in_array($a_type, self::getForbiddenFileTypes()))
                {
                        return false;
                }
                if (count(self::getAllowedFileTypes()) == 0 || in_array($a_type, self::getAllowedFileTypes()))
                {
                        return true;
                }
                return false;
        }


        function duplicate()
        {
                $new_obj = new ilObjMediaObject();
                $new_obj->setTitle($this->getTitle());
                $new_obj->setDescription($this->getDescription());
                
                // media items
                foreach($this->getMediaItems() as $key => $val)
                {
                        $new_obj->addMediaItem($val);
                }

                $new_obj->create(false, true);

                // files
                $new_obj->createDirectory();
                self::_createThumbnailDirectory($new_obj->getId());
                ilUtil::rCopy(ilObjMediaObject::_getDirectory($this->getId()),
                        ilObjMediaObject::_getDirectory($new_obj->getId()));
                ilUtil::rCopy(ilObjMediaObject::_getThumbnailDirectory($this->getId()),
                        ilObjMediaObject::_getThumbnailDirectory($new_obj->getId()));
                
                // meta data
                include_once("Services/MetaData/classes/class.ilMD.php");
                $md = new ilMD(0, $this->getId(), "mob");
                $new_md = $md->cloneMD(0, $new_obj->getId(), "mob");

                return $new_obj;
        }
        
        function uploadVideoPreviewPic($a_prevpic)
        {
                $pi = pathinfo($a_prevpic["name"]);
                $ext = $pi["extension"];
                if (in_array($ext, array("jpg", "jpeg", "png")))
                {
                        $this->uploadAdditionalFile("mob_vpreview.".$ext, $a_prevpic["tmp_name"]);
                }
        }

        function generatePreviewPic($a_width, $a_height)
        {
                $item = $this->getMediaItem("Standard");

                if ($item->getLocationType() == "LocalFile" &&
                        is_int(strpos($item->getFormat(), "image/")))
                {
                        $dir = ilObjMediaObject::_getDirectory($this->getId());
                        $file = $dir."/".
                                $item->getLocation();
                        if (is_file($file))
                        {
                                if(ilUtil::isConvertVersionAtLeast("6.3.8-3"))
                                {
                                        ilUtil::execConvert(ilUtil::escapeShellArg($file)."[0] -geometry ".$a_width."x".$a_height."^ -gravity center -extent ".$a_width."x".$a_height." PNG:".$dir."/mob_vpreview.png");
                                }
                                else
                                {
                                        ilUtil::convertImage($file, $dir."/mob_vpreview.png", "PNG", $a_width."x".$a_height);
                                }
                        }
                }
        }

        function getVideoPreviewPic($a_filename_only = false)
        {
                $dir = ilObjMediaObject::_getDirectory($this->getId());
                $ppics = array("mob_vpreview.jpg",
                        "mob_vpreview.jpeg",
                        "mob_vpreview.png");
                foreach ($ppics as $p)
                {
                        if (is_file($dir."/".$p))
                        {
                                if ($a_filename_only)
                                {
                                        return $p;
                                }
                                else
                                {
                                        return $dir."/".$p;
                                }
                        }
                }
                return "";
        }

        static function fixFilename($a_name)
        {
                $a_name = ilUtil::getASCIIFilename($a_name);

                $rchars = array("`", "=", "$", "{", "}", "'", ";", " ", "(", ")");
                $a_name = str_replace($rchars, "_", $a_name);
                $a_name = str_replace("__", "_", $a_name);
                return $a_name;
        }

        static function renameExecutables($a_dir)
        {
                ilUtil::renameExecutables($a_dir);
                if (!self::isTypeAllowed("html"))
                {
                        ilUtil::rRenameSuffix($a_dir, "html", "sec");        // see #20187
                }
        }

        
}
?>