<?php
/*
 * Copyright 2007-2011 Charles du Jeu <contact (at) cdujeu.me>
 * This file is part of AjaXplorer.
 *
 * AjaXplorer is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * AjaXplorer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with AjaXplorer.  If not, see <http://www.gnu.org/licenses/>.
 *
 * The latest code can be found at <http://www.ajaxplorer.info/>.
 */

defined('AJXP_EXEC') or die( 'Access not allowed');

/**
 * @package info.ajaxplorer.plugins
 * Streams video to a client
 */
class VideoReader extends AJXP_Plugin {
	
	public function switchAction($action, $httpVars, $filesVars){
		
		if(!isSet($this->actions[$action])) return false;
    	
		$repository = ConfService::getRepository();
		if(!$repository->detectStreamWrapper(true)){
			return false;
		}
		
		$streamData = $repository->streamData;
    	$destStreamURL = $streamData["protocol"]."://".$repository->getId();
		    	
		if($action == "read_video_data"){
			AJXP_Logger::debug("REading video");
			session_write_close();
			$file = AJXP_Utils::decodeSecureMagic($httpVars["file"]);
 			$filesize = filesize($destStreamURL.$file);
 			$filename = $destStreamURL.$file;
 			//$fp = fopen($destStreamURL.$file, "r");
 			if(preg_match("/\.ogv$/", $file)){
				header("Content-Type: video/ogg; name=\"".basename($file)."\"");
 			}else if(preg_match("/\.mp4$/", $file)){
 				header("Content-Type: video/mp4; name=\"".basename($file)."\"");
 			}else if(preg_match("/\.m4v$/", $file)){
 				header("Content-Type: video/x-m4v; name=\"".basename($file)."\"");
 			}else if(preg_match("/\.webm$/", $file)){
 				header("Content-Type: video/webm; name=\"".basename($file)."\"");
 			}

			if ( isset($_SERVER['HTTP_RANGE']) && $filesize != 0 )
			{
				AJXP_Logger::debug("Http range", array($_SERVER['HTTP_RANGE']));
				// multiple ranges, which can become pretty complex, so ignore it for now
				$ranges = explode('=', $_SERVER['HTTP_RANGE']);
				$offsets = explode('-', $ranges[1]);
				$offset = floatval($offsets[0]);

				$length = floatval($offsets[1]) - $offset;
				if (!$length) $length = $filesize - $offset;
				if ($length + $offset > $filesize || $length < 0) $length = $filesize - $offset;
				header('HTTP/1.1 206 Partial Content');

				header('Content-Range: bytes ' . $offset . '-' . ($offset + $length - 1) . '/' . $filesize);
				header('Accept-Ranges:bytes');
				header("Content-Length: ". $length);
				$file = fopen($filename, 'rb');
				fseek($file, 0);
				$relOffset = $offset;
				while ($relOffset > 2.0E9)
				{
					// seek to the requested offset, this is 0 if it's not a partial content request
					fseek($file, 2000000000, SEEK_CUR);
					$relOffset -= 2000000000;
					// This works because we never overcome the PHP 32 bit limit
				}
				fseek($file, $relOffset, SEEK_CUR);

                while(ob_get_level()) ob_end_flush();
				$readSize = 0.0;
				while (!feof($file) && $readSize < $length && connection_status() == 0)
				{
					echo fread($file, 2048);
					$readSize += 2048.0;
					flush();
				}
				fclose($file);
			} else {	
 				$fp = fopen($filename, "rb");
				header("Content-Length: ".$filesize);				
				header("Content-Range: bytes 0-" . ($filesize - 1) . "/" . $filesize. ";");			
				header('Cache-Control: public');
				
				$class = $streamData["classname"];
				$stream = fopen("php://output", "a");
				call_user_func(array($streamData["classname"], "copyFileInStream"), $destStreamURL.$file, $stream);
				fflush($stream);
				fclose($stream);
			}
			//exit(1);
		}else if($action == "get_sess_id"){
			HTMLWriter::charsetHeader("text/plain");
			print(session_id());
		}
	}

    /**
     * @param AJXP_Node $ajxpNode
     */
    public function videoAlternateVersions(&$ajxpNode){
        if(!preg_match('/\.mpg$|\.mp4$|\.ogv$|\.webm$/i', $ajxpNode->getLabel())) return;
        if(file_exists(str_replace(".mpg","_PREVIEW.mp4", $ajxpNode->getUrl()))){
            $ajxpNode->mergeMetadata(array("video_altversion_mp4" => str_replace(".mpg","_PREVIEW.mp4", $ajxpNode->getPath())));
        }
        $rotating = array("mp4","ogv", "webm");
        foreach($rotating as $ext){
            if(preg_match('/\.'.$ext.'$/i', $ajxpNode->getLabel())){
                foreach($rotating as $other){
                    if($other == $ext) continue;
                    if(file_exists(str_replace($ext, $other,$ajxpNode->getUrl()))){
                        $ajxpNode->mergeMetadata(array("video_altversion_".$other => str_replace($ext, $other, $ajxpNode->getPath())));
                    }
                }
            }
        }
    }
	
}

?>
