clipbucket/upload/includes/classes/conversion/conversion.class.php

<?php

/**
 * @author : Arslan Hassan
 * @copyright : ClipBucket Conversion Kit 2012
 * @license : AAL (Attribute Assurance License)
 * @package : ClipBucket CSDK
 * @version : 3.0
 * @name : CBConverter
 * @todo : Convert Videos to Mp4,mp4-mobile, Flv, Ogg with H264
 * 
 */

/*
 * if(!defined('IN_CLIPBUCKET')) exit("Sorry, visitors not allowed");
 */
define('FFMPEG','D:\wamp\bin\ffmpeg\bin\ffmpeg.exe');
define('MPLAYER','D:\wamp\bin\mplayer\mplayer.exe');
define('MEDIAINFO','D:\wamp\bin\mediainfo\MediaInfo.exe');


/**
 * These static variables are already defined in ClipBucket,
 * if you are not using this SDK with ClipBucket, please uncomment
 * following static variables and define them accordingly
 * 
 * define("TEMP_DIR","/path/to/temp_dir"); 
 * 
 */


class CBConverter
{
    var $input; //Input File
    var $output; //Output File
    
    var $inDetails; //Details and Information of Video Input
    var $outDetails; //Details and Information of Video Output
    
    //Errors, Warnings and Messages Log, its an array
    var $log; 
    
    //Max FPS, we are coverting videos for web streaming and 30 fps is more than
    //Enough to get a good quality video for online streaming, if you have
    //Plans to incrase it, simply change max_fps value and then make changes
    //In your input values..
    var $max_fps = 30;
    
    //Max Bitrate, for web streaming 512k gives you a very good video quality
    //Youtube uses around 365k which is also not bad, here will we set
    //640k as max, where k => 1000;
    var $max_bitrate = 640000;
    
    //Allowed list of Audio Rates, any input which does not match
    //With any of the following will be replaced with the default
    //Audio Rate
    var $audio_rates = array('22050','44100','48000');
    
    //Setting up max audio bitrate, usually 128k is good but incase you want 
    //To enhance the video quality you can incrase it. read more about
    //Audio bitrate on google
    var $max_audio_bitrate = 396000;
    
    
    //IN some cases ffmpeg is not abelt convert video with more than 5 channels
    //In this situtation we have to force use 2 channels for the output video
    //As for web video, 2 channel video is actualyl pretty good
    //By setting it to true, we will use force 2 channelf or videos more than
    // 5 channels otherwise it will skipp the step
    var $valid_two_channels = true;
    
    
    //Log file where output of every command will be given.
    //By default is set to false so that defined output file can be used
    //if value set, this file will be used to save outptu.
    var $output_log = false;
    
    /**
     * Constructor and sets the input file and get information..
     * @param Video File
     */
    function CBConverter($file=NULL)
    {
        if($file)
        {
            $this->input = $file;
            $info = $this->getInfo();
            $this->inDetails = $info;
        }
    }
    
    /**
     * @name : getInfo
     * @todo : Get Video Information
     * @param STRING input
     * @return ARRAY video details
     */
    
    function getInfo($input=false)
    {
        if(!$input)
            $input = $this->input;
        
        if(!file_exists($input))
        {
            $this->log('<strong>'.$input.'</strong> File does not exist...');
            return $this->log();
        } 
        $info = $this->_getInfo($input);
        return $info;
    }
    
    /**
     * @name : _getInfo
     * @todo : Generate video info using FFMPEG or php-ffmpeg (if available)
     * @param STRING input video
     * @return ARRAY of video details
     */
    private function _getInfo($input)
    {
        //Checking if php-ffmpeg extension is available
        //there is no ffmpeg-php for windows..will work on it later...
        $CMD = FFMPEG.' -i "'.$input.'" -acodec copy'.
        ' -vcodec copy -f null ';
        
        //Add /dev/null in non win os
        if(!stristr(php_uname('s'),'windows'))
        $CMD .= '/dev/null';
            
        $rawOutput  = $this->exec($CMD,true);
        $parsedData = $this->parseData($rawOutput);
        
        //Now Getting information from media info
        $CMD = MEDIAINFO.' '.$input;
        $rawOutput  = $this->exec($CMD,true);
        //Get Parsed Data from media Info
        $miParsedData = $this->parseData($rawOutput,true);
        
        //Merge two arrays
        if($miParsedData)
            $parsedData = array_merge ($parsedData,$miParsedData);
        
        return $parsedData;
    }
    
    
    /**
     * function get ffmpeg version
     * @name getVersion
     * @return ffmpeg version
     */
    function getVersion()
    {
        $CMD = FFMPEG.' -version';
        $output = $this->exec($CMD,true);
        $array = array();
        
        
        //Checking for revision
        preg_match('/ffmpeg version N\-([0-9]+)\-/i',$output,$rev);
        $rev = $rev[1];
        
        if($rev)
            $array['rev'] = $rev;
        
        //Checking for version..
        preg_match('/ffmpeg version ([0-9.]+)/',$output,$ver);
        $ver = $ver[1];
        
        if($ver)
            $array['ver'] = $ver;
        
        //Checking for built date
        preg_match('/built on ([A-Za-z]{3}) ([0-9]{1,3}) ([0-9]{4}) /',$output,$date);
        
        $date = $date[1].' '.$date[2].' '.$date[3];
        
        $time = strtotime($date);
        
        
        if($date)
        {
            $array['date'] = date('Y-m-d',$time);
            $array['timestamp'] = $time;
        }
        
        return $array;
        
    }
    
    /**
     * @name : log
     * @todo : Log Message or Error and Insert it into log (Array)
     * @param STRING message
     * @param STRING type (e,w,m) for (errors,warnings and messages) res..
     * @return ARRAY of log
     */
    function log($msg=NULL,$type=e,$index=null)
    {
        if(!$msg)
            return $this->log;
        
        if($index)
            $this->log[$type][$index] = $msg;
        else
            $this->log[$type][] = $msg;
        
        return $this->log;
    }
    
    
    
    /**
     * @name exec
     * @param type $cmd
     * @param type $output
     * @return type 
     */
    function exec( $cmd,$output=false ) {
            # use bash to execute the command
            # add common locations for bash to the PATH
            # this should work in virtually any *nix/BSD/Linux server on the planet
            # assuming we have execute permission
            //$cmd = "PATH=\$PATH:/bin:/usr/bin:/usr/local/bin bash -c \"$cmd\" ";
            
            $output_cmd = "";
            if($output)
            {
                if(function_exists('RandomString'))
                    $outputFile = TEMP_DIR.'/'.time().RandomString(5);
                else
                    $outputFile = TEMP_DIR.'/'.time().mt_rand(5, 6);
                
                if($this->output_log)
                    $outputFile = $this->output_log;
                
                $output_cmd = " 2> ".$outputFile;
            }
            
            $result =  shell_exec( $cmd.$output_cmd);
            if(!$result && $output)
            {
                //Read output file..
                if(file_exists($outputFile))
                    $result = file_get_contents ($outputFile);
            }
            
            
            if(file_exists($outputFile) && !$this->output_log)
                unlink($outputFile)
                or $this->log('Unable to remove tmp bash output file','e');
            
            return $result;
            
    }
    
    
    /**
     * @name parseData
     * @todo Parse data and list them in array
     * @param STRING $content
     * @param BOOLEAN $mi MediaInfo data
     * @return ARRAY 
     */
    
    function parseData($content,$mi=false)
    {
        $info = array();
        
        //Things we need to extract
        /**
         * duration
         * width and height
         * bitrate
         * frame rate
         * audio bitrate
         * audio rate
         * audio channels
         * video codec
         * audio codec
         * format
         */
        
        
        #Getting Duration
        $duration = $this->pregMatch( 'Duration: ([0-9.:]+),', $content );
        $duration    = $duration[1];

        $duration = explode(':',$duration);
        //Convert Duration to seconds
        $hours = $duration[0];
        $minutes = $duration[1];
        $seconds = $duration[2];

        $hours = $hours * 60 * 60;
        $minutes = $minutes * 60;

        $duration = $hours+$minutes+$seconds;

        $info['duration'] = $duration;
        
        #Video Bitrate
        
        //Setting has_video bydefault to no 
        $info['has_video'] = 'no';
        
        $args= $this->pregMatch( 'bitrate: ([0-9]+) kb\/s', $content );
        if($args) {
            $info['bitrate'  ] = $args[1]*1000/8;
        }
        
        #Checking fps
        $args = $this->pregMatch(', ([0-9.]+) fps',$content);
        if($args)
        {
            $info['fps'] = $args[1];
        }
        #Using TBR to determine fps incase there is no value for above method
        if(!$info['fps'])
        {
            $args = $this->pregMatch(', ([0-9.]+) tbr',$content);
            if($args)
            {
                $info['fps'] = $args[1];
            }
        }
        
        #Total Frames
        if($info['fps'])
        $info['frames'] = $duration * $info['fps'];
        
        
        #Getting Video Width, Height and the Ratio
        $args= $this->pregMatch( '([0-9]{2,4})x([0-9]{2,4})', $content );
        if($args) {

            $info['width'  ] = $args[1];
            $info['height' ] = $args[2];
            $info['wh_ratio'] = (float)$info['width'] / (float)$info['height'];
            if($args[1])
            $info['has_video'] = 'yes';
        }
        
        #Getting Video Codec
        $args= $this->pregMatch('Video: ([^ ^,]+)',$content);
        if($args)
        {
                $info['video_codec'  ] = $args[1];
        }

        # get audio information
        
        //Setting has audio bydefault to no
        $info['has_audio'] = 'no';
        
        $args =  $this->pregMatch( "Audio: ([^ ]+), ([0-9]+) Hz, ".
        "([0-9+.^\n]*)(.*)?, ([0-9]+) kb\/s", $content);
        
        if($args) {
            $audio_codec = $info['audio_codec']     = $args[1];
            $audio_rate = $info['audio_rate']       = $args[2];
            $info['audio_channels']                 = $args[3];
            $info['audio_bitrate']                  = $args[5];
            
            if($args[1])
            $info['has_audio']                      = 'yes';
            
            //Checking if there is streo or mono stuff
            //Then make changes for channel key
            if(!$info['audio_channels'])
            {
                if(strstr( $args[4],'stereo'))
                    $channels = 2;

                if(strstr( $args[4],'mono'))
                    $channels = 1;
                
                $info['audio_channels'] =  $channels;
            }
        }
        
        //Incase we are not able to fetch info from above method, then
        //Try an alternative..
        if(!$audio_codec || !$audio_rate)
        {
            $args =  $this->pregMatch( "Audio: ([a-zA-Z0-9]+)(.*), ".
            "([0-9]+) Hz, ([0-9+]*)(.*)?, ([0-9]+) kb\/s", $content);
                        
            $info['audio_codec'   ] = $args[1];
            $info['audio_rate'    ] = $args[3];
            $info['audio_channels'] = $args[4];
            $info['audio_bitrate']  = $args[6];
            if($args[1])
                $info['has_audio']  = 'yes';
            
            //Checking if there is streo or mono stuff
            //Then make changes for channel key
            if(!$info['audio_channels'])
            {
                if(strstr( $args[5],'stereo'))
                    $channels = 2;

                if(strstr( $args[5],'mono'))
                    $channels = 1;
                
                $info['audio_channels'] =  $channels;
            }
        } 
        
        $info['audio_bitrate']  *= 1000;
        
        /**
         * We use MediaInfo in addition with FFMPEG to extract information
         * Because ffmpeg is not able to extract all info that we need
         * such as rotation language etc..
         */
        //Parsing from mdiainfo
        /** Dumping, just extracting rotation for now ;) 
        if(!$info['duration'])
        {
            $duration = $this->pregMatch('Duration(\s+)\" : \"([0-9a-z ]+)', $content);
            $durations = explode(' ',$duration[2]);
            
            $mins = 0;
            $hrs = 0;
            $secs = 0;
            $msecs = 0;
            foreach($durations as $d)
            {
                if(strstr($d,'mn'))
                {
                    $mins = str_replace('mn', '', $d);
                }elseif(strstr($d,'h'))
                {
                    $hrs = str_replace('h', '', $d);
                }elseif(strstr($d,'ms'))
                {
                    $msecs = str_replace('ms', '', $d);
                }elseif(strstr($d,'s'))
                {
                    $secs = str_replace('s', '', $d);
                }
            }
            
            $duration = ($hrs*60*60) + ($mins*60) + $secs + ($msecs/1000);
            $info['duration'] = $duration;
        }
        
        //Checking if input has audio and or video
        if($info['has_video']=='no')
        {
            $fps = $this->pregMatch('Frame rate(\s+)\" : \"([0-9.]+)\"',
            $content);

            if($fps[2] && strstr($content,'Video'))
            {
                $info['has_video']  = 'yes';  
                $info['fps']        = $fps[2];
            }
            
            //Checking for width and height..
            $width =  $this->pregMatch('Width(\s+)\" : \"([0-9]+)\"',
            $content);
            $height =  $this->pregMatch('Height(\s+)\" : \"([0-9]+)\"',
            $content);
            
            $info['height']     = $height[2];
            $info['width']      = $width[2];
        }
        
        if($info['has_audio']=='no')
        {
            $channels = $this->pregMatch('Channel\(s\)(\s+)\" : \"([0-9]+)\"',
            $content);
            
            if($channels[2] && strstr($content,'Audio'))
                $info['has_video'] = 'yes';  
            $info['audio_channels']      = $channels[2];
        }
        */
        
        if($mi)
        {
            $info = '';
            $rotation = $this->pregMatch('Rotation(\s+)\"? : \"?([0-9]+)', $content);
            
            if($rotation[2])
                $info['rotation'] = $rotation[2];
            else
                $info['rotation'] = 0;
        }
        
        return $info;
        
    }
    
    /**
     * Get video duration, from inDetails/outDetails array...
     * @param STRING in/out
     * @return STRING Duration
     */
    function getDuration($vid='in')
    {    
        $arr = $this->inDetails;
        if($vid!='in')
            $arr = $this->outDetails;
        
        return  $arr['duration'];
    }
    
    
    /**
     * Get video frames count
     * @param STRING in/out
     * @return STRING frames count
     */
    function getFramesCount($vid='in')
    { 
        $arr = $this->inDetails;
        if($vid!='in')
            $arr = $this->outDetails;

        return  $arr['frames'];
    }
    
    
    /**
     * Get Video Frame Rate per Second
     * @param STRING in/out
     * @return STRING fps
     */
    function getFrameRate($vid='in')
    {    
        $arr = $this->inDetails;
        if($vid!='in')
            $arr = $this->outDetails;

        return  $arr['fps'];
    }
    
    /**
     * Get Video File Name
     * @param STRING in/inout
     * @return STRING filename
     */
    function getFilename($vid='in')
    {    
        $arr = $this->inDetails;
        if($vid!='in')
            $arr = $this->outDetails;

        return  $arr['filename'];
    }
    
    /**
     * Get Video Height
     * @param STRING in/out
     * @return STRING video height
     */
    
    function getHeight($vid='in')
    {   
        $arr = $this->inDetails;
        if($vid!='in')
            $arr = $this->outDetails;

        return  $arr['height'];
    }
    
    /**
     * Get video width
     * @param STRING in/out
     * @return STRING video width
     */
    function getWidth($vid='in')
    {    
        $arr = $this->inDetails;
        if($vid!='in')
            $arr = $this->outDetails;

        return  $arr['width'];
    }
    
    /**
     * Get WHRatio
     * @param STRING in/out
     * @return STRING WHRatio
     */
    function getWHRatio($vid='in')
    {    
        $arr = $this->inDetails;
        if($vid!='in')
            $arr = $this->outDetails;

        return  $arr['width']/$arr['height'];
    }
    
    /**
     * Get Audio Bitrate
     * @param STRING in/out
     * @return STRING audio bitrate
     */
    function getAudioBitrate($vid='in')
    {    
        $arr = $this->inDetails;
        if($vid!='in')
            $arr = $this->outDetails;

        return  $arr['audio_bitrate'];
    }
    
    /**
     * Get Audio Sample Rate
     * @params STRING in/out
     * @return STRING audio rate
     */
    function getAudioRate($vid='in')
    {    
        $arr = $this->inDetails;
        if($vid!='in')
            $arr = $this->outDetails;

        return  $arr['audio_rate'];
    }
    
    /**
     * Get Video Bitrate
     * @param STRING in/out
     * @return STRING video bitrate
     */
    function getVideoBitrate($vid='in')
    {    
        $arr = $this->inDetails;
        if($vid!='in')
            $arr = $this->outDetails;

        return  $arr['bitrate'];
    }
    
    /**
     * Get Video Rate
     * @params STRING in/out
     * @return STRING video rate
     */
    function getVideoRate($vid='in')
    {    
        $arr = $this->inDetails;
        if($vid!='in')
            $arr = $this->outDetails;

        return  $arr['video_rate'];
    }
    
    
    /**
     * Get audio codec
     * @params STRING in/out
     * @return STRING audio codec
     */
    function getAudioCodec($vid='in')
    {    
        $arr = $this->inDetails;
        if($vid!='in')
            $arr = $this->outDetails;

        return  $arr['audio_codec'];
    }
    
    /**
     * Get video codec
     * @params STRING in/out
     * @return STRING video codec
     */
    function getVideoCodec($vid='in')
    {    
        $arr = $this->inDetails;
        if($vid!='in')
            $arr = $this->outDetails;

        return  $arr['video_codec'];
    }
    
    /**
     * Get audio channels
     * @params STRING in/out
     * @return STRING audio channels
     */
    function getAudioChannes($vid='in')
    {    
        $arr = $this->inDetails;
        if($vid!='in')
            $arr = $this->outDetails;

        return  $arr['audio_channels'];
    }
    
    /**
     * Check file has video or not
     * @params STRING in/out
     * @return BOOLEAN
     */
    function hasVideo($vid='in')
    {    
        $arr = $this->inDetails;
        if($vid!='in')
            $arr = $this->outDetails;

        if($arr['has_video']=='yes')
            return true;
        else
            return false;
    }
    
    
    /**
     * Check file has audio or not
     * @params STRING in/out
     * @return BOOLEAN
     */
    function hasAudio($vid='in')
    {    
        $arr = $this->inDetails;
        if($vid!='in')
            $arr = $this->outDetails;

        if($arr['has_audio']=='yes')
            return true;
        else
            return false;
    }
    
    
     /**
     * Check file has audio or not
     * @params STRING in/out
     * @return BOOLEAN
     */
    function getRotation($vid='in')
    {    
        $arr = $this->inDetails;
        if($vid!='in')
            $arr = $this->outDetails;
        if($arr['rotation'])
            return $arr['rotation'];
        else
            return '0';
    }
    
    /**
     * Function used to convert video in 
     * - MP4 , h264, aac for web streaming
     * - FLV , h264, aac for web streaming
     * - WebM, Standard Adopted by Google for webs streaming using HTML5
     * - mobile , H264/3GP for mobile streaming
     * 
     * Resize => 
     */
    
    function convert($params=false)
    {
        $defaults = array(
            'format' => 'flv',
            '2pass'  => false,
            'h264'   => true,
            'height' => '490',
            'width'  => '640',
            'resize' => 'max',
            'bitrate' => 512000,
            'aspect_ratio' => '4:3',
            'arate'  => '22050',
            'fps'    => 24,
            'abitrate'=> 128000,
            'preset' => 'normal',
            'auto_rotate' => true,
            
        );
        

        if($params && $defaults)
            $params = array_merge($defaults, $params);
        elseif($defaults)
            $params = $defaults;
        
        $output_file = $params['output_file'];
        
        //Creating array to pass to calculateResize func
        //and get resizeable width and height...
        
        $dimInfo = array(
            'height'            => $this->getHeight(),
            'width'             => $this->getWidth(),
            'resize_height'        => $params['height'],
            'resize_width'         => $params['width'],
            'wh_ratio'      => $this->getWHRatio(),
            'resize_ratio'  => $params['aspect_ratio'],
            'resize'        => $params['resize'],
        );
        
        $resizedInfo = $this->calculateResize($dimInfo);
        
        
         /**
          * Here we will preset everything before checking for which
          * format we are going to convert into..
          * first we will set up basic values for all common inputs such
          * as width, height, bitrates, by default we will make
          * h264 and aac to be used as video and audio codecs, respectively.
          * we can later change them in switch statement.
          */


        
        //Setting Up the Codecs..
        $validCodecs = array('libx264','libvorbis','libfaac','mpeg4','aac',
        'libmp3lame','mp3','flv','libvpx');
        
        $vcodec = $params['vcodec'];
        if(!in_array($vcodec, $validCodecs) && $vcodec)
        {
            $vcodec = 'libx264';
        }
        
        if(!$vcodec && $params['h264'])
            $vcodec = 'libx264';
        
        $acodec = $params['acodec'];
        if(!in_array($acodec, $validCodecs) && $acodec
                || ( !$acodec && $vcodec = 'libx264'))
        {
            $acodec = 'libfaac';
        }
        
        
        
        //Setting videobitrate and audiobitrate..
        //Learn more about bitrates on google ;)
        $fps = $params['fps'];
        $in_fps = $this->getFrameRate();
        
        $fps = min($fps,$in_fps);
        
        //As we are converting videos for web streaming, so we are keeping
        //Frame rates to max 30 chek max_fps var, if you have plans of changing to more
        //Simple change the second condition..
        if($fps<24)
            $fps = 24;
        if($fps>$this->max_fps)
            $fps = $this->max_fps;
        
        //Bitrate controls the size and quality we are setting them 
        //To get the best output...max bitrate by default is 640k
        $bitrate = $params['bitrate'];
        $in_bitrate = $this->getVideoBitrate();
        
        $bitrate = min($bitrate,$in_bitrate);
        if($bitrate>$this->max_bitrate)
            $bitrate = $this->max_bitrate;
        
        //Audio Rate also known as sample rate will make your audio 
        //Heard more clearly WRT media and in web streaming we 
        //use 22050,44100 or 48000
        $arate = $params['arate'];
        $in_arate = $this->getAudioRate();
        
        $arate = min($arate,$in_arate);
        
        if(!in_array($arate, $this->audio_rates))
        {
            $arate = $defaults['arate'];
        }
        
        //Audio Bitrate controls the audio quality, usually
        //96k bit audio is pretty good fod videos but if you want to get
        //More quality audio you can increase audio bitrate to 128, 164,
        //256, 396 etc...by default we will use 128k and for max 396k
        
        $abitrate = $params['abitrate'];
        $in_abitrate = $this->getAudioBitrate();
        
        $abitrate = min($abitrate,$in_abitrate);
        
        if(!$abitrate>$this->max_audio_bitrate)
            $abitrate = $this->max_audio_bitrate;
        
        
        $presets = array(
            'width'             => $resizedInfo['width'],
            'height'            => $resizedInfo['height'],
            'aspect_ratio'      => $resizedInfo['ratio'],
            'vcodec'            => $vcodec,
            'acodec'            => $acodec,
            'preset'            => $params['preset'],
            'fps'               => $fps,
            'arate'             => $arate,
            'bitrate'           => $bitrate,
            'abitrate'          => $abitrate,
        );
        
        
        //Setting the input option array which will later become
        //String/command to make things more easier
        
        $cmd_array = array(
            'i'     => $this->input,
        );
        

        
        //Overwrite existing
        $cmd_array['y']          = ' ';
        
        if($presets['acodec'])
            $cmd_array['acodec'] = $presets['acodec'];

        if($presets['vcodec'])
            $cmd_array['vcodec'] = $presets['vcodec'];
        
        if($presets['width'] && $presets['height'])
            $cmd_array['s'] = $presets['width'].'x'.$presets['height'];

        if($presets['fps'])
            $cmd_array['r'] = $presets['fps'];

        if($presets['bitrate'])
            $cmd_array['b:v'] = $presets['bitrate'];

        if($presets['arate'])
            $cmd_array['ar'] = $presets['arate'];

        if($presets['abitrate'])
            $cmd_array['ab'] = $presets['abitrate'];

        //If channels are greater than 2, video is not convertable
        //In many cases, so we always choose 2 channel audio
        if($this->valid_two_channels)
            if($this->getAudioChannes()>2)
                $cmd_array['ac'] = 2;
        
            
        /**
         * Checking if there is some duration or size limit
         */
       
        if($params['max_duration'] && is_numeric($params['max_duration']))
        {
            $cmd_array['t'] = $params['duration'];
        }
        
        if($params['max_size'] && is_numeric($params['max_size']))
        {
            $cmd_array['fs'] = $params['max_size'];
        }
        
        
        //Padding
        $rinfo = $resizedInfo;
        if($rinfo['pad_x'] || $rinfo['pad_y'])
        {
            $pad_width  = $rinfo['width'] + ($rinfo['pad_x']*2);
            $pad_height = $rinfo['height'] + ($rinfo['pad_y']*2);

            if(!$params['padding_color'])
                $pad_color = 'black';
            else
                $pad_color = $params['padding_color'];

            $pad_cmd = "pad=$pad_width:$pad_height";
            $pad_cmd .= ":".$rinfo['pad_x'].":".$rinfo['pad_y'];
            $pad_cmd .= ":".$pad_color;
            
            $cmd_array['vf']['pad'] = $pad_cmd;
        }
                
        /**
         * Attaching subtitles..
         * subtitles are array and must be only ttf
         */
        if($params['subtitles'])
        {
            
            
        }
        
        //Adding Watermark
        
        if($params['watermark'])
        {
            $cmd_array['vf']['overlay'] = 
            $this->_genWatermark($params['watermark'],
            $params['watermarl_position'],
            $params['watermark_offset']);
        }
        
        //Adding Rotation
        if($params['auto_rotate'])
        {
            $rotationCMD = $this->_getRotation($this->inDetails['rotation']);
            if($rotationCMD)
            {
                $cmd_array['vf']['rotation'] = $rotationCMD;
            }
        }
        
        
        
        //Disabling audio in case there is no audio
        if(!$this->hasAudio())
            $cmd_array['an'] = '';
        
        switch($params['format'])
        {
            
            //FLV and Mp4 uses almost same method to get the output
            //unless Mp4 is for mobile, however both are converted
            //Using same codecs (mostly libx264) thats why
            //we will use same code for both
            case "flv":
            case "mp4":
            case "m4v":
            case "f4v":
            default:
            {
                $f = $params['format'];
                if($params['preset'])
                    $cmd_array['vpre'] = $params['preset'];
                
                /**
                 * - f
                 * Force input or output file format. The format is normally 
                 * auto detected for input files and guessed from file extension
                 * for output files, so this option is not needed in most cases.
                 */
                
                /*if($f=='f4v' || $f=='mp4' || $f=='m4v')
                    $cmd_array['f'] = 'mp4';
                
                if($f=='flv')
                    $cmd_array['f'] = 'flv';*/
            }
            
            break;
            case "webm":
            {
                $cmd_array['vcodec'] = 'libvpx';
                $cmd_array['acodec'] = 'libvorbis';
                $cmd_array['f'] = 'webm';
            }
            
            case "mobile":
            case "mobile-mp4":
            {
                //Add mobile conditions here..
            }
            
            break;
            
            case "3gp":
            {   
                //Auto-detect by ffmpeg :)
                /*$cmd_array['vcodec'] = 'h263';
                $cmd_array['acodec'] = 'libamr_nb';*/
                unset($cmd_array['vcodec']);
                unset($cmd_array['acodec']);
                unset($cmd_array['ar']);
                //Ideal video bitrate for 3gp is 4.7k
                $cmd_array['b:v']   = '4.7k';
                //Idea audio rate for 3gp is 8k
                $cmd_array['ar']    = 8000;
                //3gp supports following dimensions
                //128x96,176x144,352x288,704x576,1408x1152
                $widths = array('128','176','352','704','1408');
                $closest_width = $this->getClosest($params['width'],$widths);
                
                $dims = array(
                    '128' => array('width'=>128,'height'=>96),
                    '176' => array('width'=>176,'height'=>144),
                    '352' => array('width'=>352,'height'=>288),
                    '704' => array('width'=>704,'height'=>576),
                    '1408' => array('width'=>1408,'height'=>1152)
                );
                
                $dimInfo['resize_width'] = $dims[$closest_width]['width'];
                $dimInfo['resize_height'] = $dims[$closest_width]['height'];
                $dimInfo['resize_ratio'] = 1.222222222222222;
                $dimInfo['resize'] = 'fit';
                
                //Recalculating Video Dimension
                $rinfo = $this->calculateResize($dimInfo);
                
                //Setting Padding and Resize parameters
                $cmd_array['s'] = $rinfo['width'].'x'.$rinfo['height'];
                
                //Padding
                if($rinfo['pad_x'] || $rinfo['pad_y'])
                {
                    
                    $pad_width  = $rinfo['width'] + ($rinfo['pad_x']*2);
                    $pad_height = $rinfo['height'] + ($rinfo['pad_y']*2);
                    
                    if(!$params['padding_color'])
                        $pad_color = 'black';
                    else
                        $pad_color = $params['padding_color'];
                    
                    $cmd_array['vf']['pad'] = "pad=$pad_width:$pad_height";
                    $cmd_array['vf']['pad'] .= ":".$rinfo['pad_x'].":".$rinfo['pad_y'];
                    $cmd_array['vf']['pad'] .= ":".$pad_color;
                }
                
                $cmd_array['ac']    = 1;
            }
            break;
            
            case 'ogg';
            {
                //Add ogg conditions here...
                unset($cmd_array['vcodec']);
                unset($cmd_array['acodec']);
            }
            break;
            
            
        }
        
        
        
        $CMD = FFMPEG;     
        foreach($cmd_array as $opt => $val)
        {
            
            if($val)
            {
                if(is_array($val))
                {
                    foreach($val as $k => $v)
                    {
                        if($v)
                        {
                          $CMD .= " -".$opt;
                          $CMD .= " '".$v."' ";
                          
                        }
                    }
                }else
                {
                    $CMD .= " -".$opt;
                    $CMD .= " ".$val;
                }
            }
        }        
        
        $CMD .= " ".$output_file;
        
        $log = $this->exec($CMD);
        
        return $log;
    }
    
    
    
    /**
     * Function used to calculate video padding
     */
    private function calculateResize($params)	
    {
        $p = $params;

        switch( $p['resize'] ) {
                # dont resize, use same size as source, and aspect ratio
                # WARNING: some codec will NOT preserve the aspect ratio
                case 'no':
                default:
                    $width      = $p['width'   ];
                    $height     = $p['height'  ];
                    $ratio      = $p['wh_ratio'];
                    $pad_x      = 0;
                    $pad_y      = 0;
                break;
               
                # resize to parameters width X height, use same aspect ratio
                # WARNING: some codec will NOT preserve the aspect ratio
                case 'WxH':
                case "wxh":
                        $width  = $p['resize_width'   ];
                        $height = $p['resize_height'  ];
                        $ratio  = $p['wh_ratio'];
                        $pad_y  = 0;
                        $pad_x  = 0;
                        
                        break;
                # make pixel square
                # reduce video size if bigger than p[width] X p[height]
                # and preserve aspect ratio
                case 'max':
                    $width        = (float)$p['width'   ];
                    $height       = (float)$p['height'  ];
                    $ratio        = (float)$p['wh_ratio'];
                    $max_width    = (float)$p['resize_width'   ];
                    $max_height   = (float)$p['resize_height'  ];

                    # make pixels square
                    if( $ratio > 1.0 )
                            $width = $height * $ratio;
                    else
                            $height = @$width / $ratio;

                    # reduce width
                    if( $width > $max_width ) {
                            $r       = $max_width / $width;
                            $width  *= $r;
                            $height *= $r;
                    }

                    # reduce height
                    if( $height > $max_height ) {
                            $r       = $max_height / $height;
                            $width  *= $r;
                            $height *= $r;
                    }

                    # make size even (required by many codecs)
                    $width  = (integer)( ($width  + 1 ) / 2 ) * 2;
                    $height = (integer)( ($height + 1 ) / 2 ) * 2;
                break;
                
                case "fit":
                {
                    $width        = (float)$p['width'   ];
                    $height       = (float)$p['height'  ];
                    $ratio        = (float)$p['wh_ratio'];
                    $max_width    = (float)$p['resize_width'   ];
                    $max_height   = (float)$p['resize_height'  ];

                    # make pixels square
                    if( $ratio > 1.0 )
                            $width = $height * $ratio;
                    else
                            $height = @$width / $ratio;

                    # reduce width
                    if( $width > $max_width ) {
                            $r       = $max_width / $width;
                            $width  *= $r;
                            $height *= $r;
                    }

                    # reduce height
                    if( $height > $max_height ) {
                            $r       = $max_height / $height;
                            $width  *= $r;
                            $height *= $r;
                    }

                    # make size even (required by many codecs)
                    $width  = (integer)( ($width  + 1 ) / 2 ) * 2;
                    $height = (integer)( ($height + 1 ) / 2 ) * 2;
                    
                    $output_width   = $p['resize_width'];
                    $output_height  = $p['resize_height'];
                    
                    $pad_x          = $output_width-$width;
                    $pad_x          /= 2;
                    
                    $pad_y          = $output_height-$height;
                    $pad_y          = $pad_y/2;
                    
                }
        }
        
        return array('width'=>$width,'height'=>$height,'pad_x'=>
        $pad_x,'pad_y'=>$pad_y,'ratio'=>$ratio);
    }

    
    
    /**
     * @name : pregMatch
     * @todo : Simplifies Pregmatch by added slashes
     * @return STRING
     */
    function pregMatch($in,$str)
    {	
        preg_match("/$in/",$str,$args);
        return $args;
    }
    
    /**
     * Find closest value..
     * @param STRING search in numeric
     * @param ARRAY an array of values to be matched
     * @return Matched string
     */
    
    function getClosest($search, $arr)
    {
       $closest = null;
       foreach($arr as $item)
       {
          if($closest == null || abs($search - $closest) > abs($item - $search))
          {
             $closest = $item;
          }
       }
       return $closest;
    }
    
    
    /**
     * function used to generate watermark command
     * @params STRING watermark file
     * @params STRING position 
     * @params STRING offset array(x,y)
     */

    private function _genWatermark($file,$position='tr',$offset=NULL)
    {
        if(!$offset)
            $offset = array(10,10);
        
        //This will only generate overlay command
        if(file_exists($file)){
            
            $yOffset = $offset[1] ?  $offset[1] : '0';
            $xOffset = $offset[0] ?  $offset[0] : '0';
            
            $positions = array(
              'tr'  => 'W-w-'.$xOffset.':'.$yOffset, 
              'tl'  => $xOffset.':'.$yOffset,
              'bl'  => $xOffset.':H-h-'.$yOffset,
              'br'  => 'W-w-'.$xOffset.':H-h-'.$yOffset,
                
            );
            
            if(!$positions[$position])
                $position = 'tr';
            
            $LOGO = $file;
            
            $cmd = 'movie='.$LOGO.'[logo];[in][logo]overlay='.$positions[$position].'[out]';
            
            return $cmd;
        }
        
        return false;
        
    }
    
    
    /**
     * Function used to add watermark on a video
     * @param ARRAY 
     * - input
     * - output
     * - watermark
     * - position (tl,tr,bl,bf)
     * - offest array(x,y)
     */
    
    function addWatermark($file,$output,$watermark,$position='tr',$offset=array(10,10))
    {
        if(!$file || !file_exists($file))
            return false;
        if(!$watermark || !file_exists($watermark))
            return false;
        
        //using _getWatermark function to get the command
        $overlay_cmd = $this->_genWatermark($watermark,$position,$offset);
        
        $CMD = FFMPEG;
        $CMD .= " -i '$file' ";
        //force overwrite
        $CMD .= " -y ";
        $CMD .= $output;
        
        $output = $this->exec($CMD,true);
        
        //Todo : Create result parser and output resutls
        
        return true;        
    }
    
    
    /**
     * Function used to generate rotate video command
     * @param FILE
     */
    private function _getRotation($rotation)
    {
        if($rotation)
        {
            switch($rotation)
            {
                case "90":
                {
                    $cmd = "transpose=1";
                }
                break;
            
                case "270":
                {
                    $cmd = "transpose=2";
                }
                break;
                
                case "90-vflip":
                {
                    $cmd = "transpose=0";
                }
                break;
                
                case "270-vflip":
                {
                    $cmd = "transpose=3";
                }
                break;
            
                case "vflip":
                {
                    $cmd = "vflip";
                }
                break;
            
                case "hflip":
                {
                    $cmd = "hflip";
                }
            }
            
            if($cmd)
            {
                return $cmd;
            }
        }
        
        return false;
    }
    
    /**
     * Function used to rotate video
     * 
     */
    function rotateVideo($file,$rotation)
    {
        if(!$file || !file_exists($file))
            return false;
        
        $rotateCmd = $this->_getRotation($rotation);
        
        $CMD = FFMPEG;
        $CMD .= " -i '$file' ";
        //force overwrite
        $CMD .= " -y ";
        $CMD .= $output;
        
        $output = $this->exec($CMD,true);
        //Todo : Create result parser and output resutls
        
        return true; 
    }
    
    
    /**
     * function used to extract image from a video
     * @param STRING input file
     * @param array(
     * 'num' => number of images..
     * 'size' => WidthxHeight
     * 'time' => sepecific time
     * '
     * )
     */
    
    function extractThumb($input=false,$params=false)
    {
        $defaults = array
        (
            'size'  => 'same',
            'time'  => '5',
            'num'   => '20',
            'increment' => true,
            'outname'   => getName($input),
            'outdir'    => TEMP_DIR,
            'resize'    => 'fit'
        );
        
        if(!$input)
        {
            $input = $this->input;
            $iDetails = $this->inDetails;
        }else
        {
            if(file_exists($input))
            {
                $iDetails = $this->_getInfo($input);
            }else{
                //log the fishy error
            }
        }
        
        
        if(!$iDetails)
        {
            //Log an error...
            return false;
        }
        
        
        if($params)
            $params = array_merge($defaults,$params);
        else
            $params = $defaults;
        
        //If there is no outname then re-create1
        if(!$params['outname'])
        {
            $params['outname'] = getname($this->input);
        }
        
        
        $count = 0;
        $outname = $params['outname'];
        $outputname = $outname.'.jpg';
        //Adding increment
        while(1)
        {
            if($count>0)
                $outputname = $outname.'-'.$count.'.jpg';
            
            if(!file_exists($params['outdir'].'/'.$outputname))
            {
                break;
            }else
            {
                if(!$params['increment'])
                {
                    unlink($params['outdir'].'/'.$outputname);
                    break;
                }
            }
            
            $count++;
        }
        
        //Setting upt the size
        $size = $params['size'];
        if($size!='same')
        {
            $sizes = explode('x',$size);
            $width = $sizes[0];
            $height = $sizes[1];
        
        
            $dimInfo = array(
                'height'            => $iDetails['height'],
                'width'             => $iDetails['width'],
                'resize_height'     => $height,
                'resize_width'      => $width,
                'wh_ratio'          => $iDetails['width']/$iDetails['height'],
                'resize_ratio'      => $width/$height,
                'resize'            => $params['resize'],
            );
            
            $rinfo = $this->calculateResize($dimInfo);
            
            $pad_width  = $rinfo['width']   + ($rinfo['pad_x']*2);
            $pad_height = $rinfo['height']  + ($rinfo['pad_y']*2);

            if(!$params['padding_color'])
                $pad_color = 'black';
            else
                $pad_color = $params['padding_color'];

            $cmd_array['vf']['pad'] = "pad=$pad_width:$pad_height";
            $cmd_array['vf']['pad'] .= ":".$rinfo['pad_x'].":".$rinfo['pad_y'];
            $cmd_array['vf']['pad'] .= ":".$pad_color;
        }
        
        
        //Setting Time
        if($params['time'])
        {
            $time = $params['time'];
        }
        
        //Setting numbers
        $vframes = 1;
        $rateCMD = "";
        if($params['num'])
        {
            if($params['num']>1)
            {
                $outputname = $params['outdir'].'/'
                .$params['outname'].'-%03d.jpg';
                
                $vframes = $params['num'];
                $rateCMD = " -r ".$vframes.'/'.$iDetails['duration'];
                
            }   
        }
        
        
        $CMD = FFMPEG;
        
        if($time)
        {
            $CMD .= ' -ss '.$time;
        }
        
        $CMD .= ' -i '.$input;
        $CMD .= " -y ";
        $CMD .= " -an ";
        $CMD .= " -sameq ";
        $CMD .= " -vframes ".$vframes;
        $CMD .= " -f image2";
        $CMD .= " -vcodec mjpeg";
        if($rateCMD)
        {
            $CMD .= $rateCMD;
        }
        if($size!='same')
        {
            $CMD .= " -s ".$rinfo['width']."x".$rinfo['height'];
            $CMD .= " -vf '";
            $CMD .= "pad=$pad_width:$pad_height";
            $CMD .= ":".$rinfo['pad_x'].":".$rinfo['pad_y'];
            $CMD .= ":".$pad_color;
            $CMD .= "' ";
        }
        
        $CMD .= " ".$outputname;
        
        return $CMD;
    }
    
    
    
    /**
     * FFmpeg log praser
     * 
     * This function will look for errors, warnings and anything from ffmpeg
     * which causing problem while conversion or anything. We will keep
     * updating this functions as we will have more new errors in future
     * 
     * @param STRING $LOG
     * @return ARRAY $ERRORS
     */
    function ffmpegLogParser($log)
    {
        $errors = array();
        
        /* Checking if there is some ffmepg execution error */
        preg_match();
        
        /* Checking for codec missing error */
        
        /* Checking for bitrate/width/etc issue */
        
        /* Checking for preset error */
        
        /* Checking for file missing error */
        
    }
    
    
    
    /**
     * function used to set the log file
     * Simple set the value for output_log
     * 
     * @param STRING $file 
     */
    function set_log($file=false)
    {
        if(!$file)
            $file = $outputFile = TEMP_DIR.'/'.time().mt_rand(5, 6);
        
        $this->output_log = $file;
        return $file;
    }
}
?>