<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org>               //
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
/////////////////////////////////////////////////////////////////
//                                                             //
// Please see readme.txt for more information                  //
//                                                            ///
/////////////////////////////////////////////////////////////////

// Defines
define('GETID3_VERSION', '1.7.10b1-20090308');
define('GETID3_FREAD_BUFFER_SIZE', 16384); // read buffer size in bytes



class getID3
{
    // public: Settings
    var $encoding        = 'ISO-8859-1';   // CASE SENSITIVE! - i.e. (must be supported by iconv())
                                           // Examples:  ISO-8859-1  UTF-8  UTF-16  UTF-16BE

    var $encoding_id3v1  = 'ISO-8859-1';   // Should always be 'ISO-8859-1', but some tags may be written in other encodings such as 'EUC-CN'

    var $tempdir         = '*';            // default '*' should use system temp dir

    // public: Optional tag checks - disable for speed.
    var $option_tag_id3v1         = true;  // Read and process ID3v1 tags
    var $option_tag_id3v2         = true;  // Read and process ID3v2 tags
    var $option_tag_lyrics3       = true;  // Read and process Lyrics3 tags
    var $option_tag_apetag        = true;  // Read and process APE tags
    var $option_tags_process      = true;  // Copy tags to root key 'tags' and encode to $this->encoding
    var $option_tags_html         = true;  // Copy tags to root key 'tags_html' properly translated from various encodings to HTML entities

    // public: Optional tag/comment calucations
    var $option_extra_info        = true;  // Calculate additional info such as bitrate, channelmode etc

    // public: Optional calculations
    var $option_md5_data          = false; // Get MD5 sum of data part - slow
    var $option_md5_data_source   = false; // Use MD5 of source file if availble - only FLAC and OptimFROG
    var $option_sha1_data         = false; // Get SHA1 sum of data part - slow
    var $option_max_2gb_check     = true;  // Check whether file is larger than 2 Gb and thus not supported by PHP

    // private
    var $filename;


    // public: constructor
    function getID3()
    {

        $this->startup_error   = '';
        $this->startup_warning = '';

        // Check for PHP version >= 4.2.0
        if (phpversion() < '4.2.0') {
            $this->startup_error .= 'getID3() requires PHP v4.2.0 or higher - you are running v'.phpversion();
        }

        // Check memory
        $memory_limit = ini_get('memory_limit');
        if (eregi('([0-9]+)M', $memory_limit, $matches)) {
            // could be stored as "16M" rather than 16777216 for example
            $memory_limit = $matches[1] * 1048576;
        }
        if ($memory_limit <= 0) {
            // memory limits probably disabled
        } elseif ($memory_limit <= 3145728) {
            $this->startup_error .= 'PHP has less than 3MB available memory and will very likely run out. Increase memory_limit in php.ini';
        } elseif ($memory_limit <= 12582912) {
            $this->startup_warning .= 'PHP has less than 12MB available memory and might run out if all modules are loaded. Increase memory_limit in php.ini';
        }

        // Check safe_mode off
        if ((bool) ini_get('safe_mode')) {
            $this->warning('WARNING: Safe mode is on, shorten support disabled, md5data/sha1data for ogg vorbis disabled, ogg vorbos/flac tag writing disabled.');
        }


        // define a constant rather than looking up every time it is needed
        if (!defined('GETID3_OS_ISWINDOWS')) {
            if (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN') {
                define('GETID3_OS_ISWINDOWS', true);
            } else {
                define('GETID3_OS_ISWINDOWS', false);
            }
        }

        // Get base path of getID3() - ONCE
        if (!defined('GETID3_INCLUDEPATH')) {
            foreach (get_included_files() as $key => $val) {
                if (basename($val) == 'getid3.php') {
                    define('GETID3_INCLUDEPATH', dirname($val).DIRECTORY_SEPARATOR);
                    break;
                }
            }
        }

        // Load support library
        if (!include_once(GETID3_INCLUDEPATH.'getid3.lib.php')) {
            $this->startup_error .= 'getid3.lib.php is missing or corrupt';
        }


        // Needed for Windows only:
        // Define locations of helper applications for Shorten, VorbisComment, MetaFLAC
        //   as well as other helper functions such as head, tail, md5sum, etc
        // IMPORTANT: This path cannot have spaces in it. If neccesary, use the 8dot3 equivalent
        //   ie for "C:/Program Files/Apache/" put "C:/PROGRA~1/APACHE/"
        // IMPORTANT: This path must include the trailing slash
        if (GETID3_OS_ISWINDOWS && !defined('GETID3_HELPERAPPSDIR')) {

            $helperappsdir = GETID3_INCLUDEPATH.'..'.DIRECTORY_SEPARATOR.'helperapps'; // must not have any space in this path

            if (!is_dir($helperappsdir)) {
                $this->startup_error .= '"'.$helperappsdir.'" cannot be defined as GETID3_HELPERAPPSDIR because it does not exist';
            } elseif (strpos(realpath($helperappsdir), ' ') !== false) {
                $DirPieces = explode(DIRECTORY_SEPARATOR, realpath($helperappsdir));
                foreach ($DirPieces as $key => $value) {
                    if ((strpos($value, '.') !== false) && (strpos($value, ' ') === false)) {
                        if (strpos($value, '.') > 8) {
                            $value = substr($value, 0, 6).'~1';
                        }
                    } elseif ((strpos($value, ' ') !== false) || strlen($value) > 8) {
                        $value = substr($value, 0, 6).'~1';
                    }
                    $DirPieces[$key] = strtoupper($value);
                }
                $this->startup_error .= 'GETID3_HELPERAPPSDIR must not have any spaces in it - use 8dot3 naming convention if neccesary (on this server that would be something like "'.implode(DIRECTORY_SEPARATOR, $DirPieces).'" - NOTE: this may or may not be the actual 8.3 equivalent of "'.$helperappsdir.'", please double-check). You can run "dir /x" from the commandline to see the correct 8.3-style names.';
            }
            define('GETID3_HELPERAPPSDIR', realpath($helperappsdir).DIRECTORY_SEPARATOR);
        }

    }


    // public: setOption
    function setOption($optArray) {
        if (!is_array($optArray) || empty($optArray)) {
            return false;
        }
        foreach ($optArray as $opt => $val) {
            //if (isset($this, $opt) === false) {
            if (isset($this->$opt) === false) {
                continue;
            }
            $this->$opt = $val;
        }
        return true;
    }


    // public: analyze file - replaces GetAllFileInfo() and GetTagOnly()
    function analyze($filename) {

        if (!empty($this->startup_error)) {
            return $this->error($this->startup_error);
        }
        if (!empty($this->startup_warning)) {
            $this->warning($this->startup_warning);
        }

        // init result array and set parameters
        $this->info = array();
        $this->info['GETID3_VERSION'] = GETID3_VERSION;

        // Check encoding/iconv support
        if (!function_exists('iconv') && !in_array($this->encoding, array('ISO-8859-1', 'UTF-8', 'UTF-16LE', 'UTF-16BE', 'UTF-16'))) {
            $errormessage = 'iconv() support is needed for encodings other than ISO-8859-1, UTF-8, UTF-16LE, UTF16-BE, UTF-16. ';
            if (GETID3_OS_ISWINDOWS) {
                $errormessage .= 'PHP does not have iconv() support. Please enable php_iconv.dll in php.ini, and copy iconv.dll from c:/php/dlls to c:/windows/system32';
            } else {
                $errormessage .= 'PHP is not compiled with iconv() support. Please recompile with the --with-iconv switch';
            }
            return $this->error($errormessage);
        }

        // Disable magic_quotes_runtime, if neccesary
        $old_magic_quotes_runtime = get_magic_quotes_runtime(); // store current setting of magic_quotes_runtime
        if ($old_magic_quotes_runtime) {
            set_magic_quotes_runtime(0);                        // turn off magic_quotes_runtime
            if (get_magic_quotes_runtime()) {
                return $this->error('Could not disable magic_quotes_runtime - getID3() cannot work properly with this setting enabled');
            }
        }

        // remote files not supported
        if (preg_match('/^(ht|f)tp:\/\//', $filename)) {
            return $this->error('Remote files are not supported in this version of getID3() - please copy the file locally first');
        }

        $filename = str_replace('/', DIRECTORY_SEPARATOR, $filename);
        $filename = preg_replace('#'.preg_quote(DIRECTORY_SEPARATOR).'{2,}#', DIRECTORY_SEPARATOR, $filename);

        // open local file
        if (file_exists($filename) && ($fp = @fopen($filename, 'rb'))) {
            // great
        } else {
            return $this->error('Could not open file "'.$filename.'"');
        }

        // set parameters
        $this->info['filesize'] = filesize($filename);

        // option_max_2gb_check
        if ($this->option_max_2gb_check) {
            // PHP doesn't support integers larger than 31-bit (~2GB)
            // filesize() simply returns (filesize % (pow(2, 32)), no matter the actual filesize
            // ftell() returns 0 if seeking to the end is beyond the range of unsigned integer
            fseek($fp, 0, SEEK_END);
            if ((($this->info['filesize'] != 0) && (ftell($fp) == 0)) ||
                ($this->info['filesize'] < 0) ||
                (ftell($fp) < 0)) {
                    $real_filesize = false;
                    if (GETID3_OS_ISWINDOWS) {
                        $commandline = 'dir /-C "'.str_replace('/', DIRECTORY_SEPARATOR, $filename).'"';
                        $dir_output = `$commandline`;
                        if (eregi('1 File\(s\)[ ]+([0-9]+) bytes', $dir_output, $matches)) {
                            $real_filesize = (float) $matches[1];
                        }
                    } else {
                        $commandline = 'ls -o -g -G --time-style=long-iso '.escapeshellarg($filename);
                        $dir_output = `$commandline`;
                        if (eregi('([0-9]+) ([0-9]{4}-[0-9]{2}\-[0-9]{2} [0-9]{2}:[0-9]{2}) '.preg_quote($filename).'$', $dir_output, $matches)) {
                            $real_filesize = (float) $matches[1];
                        }
                    }
                    if ($real_filesize === false) {
                        unset($this->info['filesize']);
                        fclose($fp);
                        return $this->error('File is most likely larger than 2GB and is not supported by PHP');
                    } elseif ($real_filesize < pow(2, 31)) {
                        unset($this->info['filesize']);
                        fclose($fp);
                        return $this->error('PHP seems to think the file is larger than 2GB, but filesystem reports it as '.number_format($real_filesize, 3).'GB, please report to info@getid3.org');
                    }
                    $this->info['filesize'] = $real_filesize;
                    $this->error('File is larger than 2GB (filesystem reports it as '.number_format($real_filesize, 3).'GB) and is not properly supported by PHP.');
            }
        }

        // set more parameters
        $this->info['avdataoffset']        = 0;
        $this->info['avdataend']           = $this->info['filesize'];
        $this->info['fileformat']          = '';                // filled in later
        $this->info['audio']['dataformat'] = '';                // filled in later, unset if not used
        $this->info['video']['dataformat'] = '';                // filled in later, unset if not used
        $this->info['tags']                = array();           // filled in later, unset if not used
        $this->info['error']               = array();           // filled in later, unset if not used
        $this->info['warning']             = array();           // filled in later, unset if not used
        $this->info['comments']            = array();           // filled in later, unset if not used
        $this->info['encoding']            = $this->encoding;   // required by id3v2 and iso modules - can be unset at the end if desired

        // set redundant parameters - might be needed in some include file
        $this->info['filename']            = basename($filename);
        $this->info['filepath']            = str_replace('\\', '/', realpath(dirname($filename)));
        $this->info['filenamepath']        = $this->info['filepath'].'/'.$this->info['filename'];


        // handle ID3v2 tag - done first - already at beginning of file
        // ID3v2 detection (even if not parsing) is always done otherwise fileformat is much harder to detect
        if ($this->option_tag_id3v2) {

            $GETID3_ERRORARRAY = &$this->info['warning'];
            if (getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.tag.id3v2.php', __FILE__, false)) {
                $tag = new getid3_id3v2($fp, $this->info);
                unset($tag);
            }

        } else {

            fseek($fp, 0, SEEK_SET);
            $header = fread($fp, 10);
            if (substr($header, 0, 3) == 'ID3'  &&  strlen($header) == 10) {
                $this->info['id3v2']['header']           = true;
                $this->info['id3v2']['majorversion']     = ord($header{3});
                $this->info['id3v2']['minorversion']     = ord($header{4});
                $this->info['id3v2']['headerlength']     = getid3_lib::BigEndian2Int(substr($header, 6, 4), 1) + 10; // length of ID3v2 tag in 10-byte header doesn't include 10-byte header length

                $this->info['id3v2']['tag_offset_start'] = 0;
                $this->info['id3v2']['tag_offset_end']   = $this->info['id3v2']['tag_offset_start'] + $this->info['id3v2']['headerlength'];
                $this->info['avdataoffset']              = $this->info['id3v2']['tag_offset_end'];
            }

        }


        // handle ID3v1 tag
        if ($this->option_tag_id3v1) {
            if (!@include_once(GETID3_INCLUDEPATH.'module.tag.id3v1.php')) {
                return $this->error('module.tag.id3v1.php is missing - you may disable option_tag_id3v1.');
            }
            $tag = new getid3_id3v1($fp, $this->info);
            unset($tag);
        }

        // handle APE tag
        if ($this->option_tag_apetag) {
            if (!@include_once(GETID3_INCLUDEPATH.'module.tag.apetag.php')) {
                return $this->error('module.tag.apetag.php is missing - you may disable option_tag_apetag.');
            }
            $tag = new getid3_apetag($fp, $this->info);
            unset($tag);
        }

        // handle lyrics3 tag
        if ($this->option_tag_lyrics3) {
            if (!@include_once(GETID3_INCLUDEPATH.'module.tag.lyrics3.php')) {
                return $this->error('module.tag.lyrics3.php is missing - you may disable option_tag_lyrics3.');
            }
            $tag = new getid3_lyrics3($fp, $this->info);
            unset($tag);
        }

        // read 32 kb file data
        fseek($fp, $this->info['avdataoffset'], SEEK_SET);
        $formattest = fread($fp, 32774);

        // determine format
        $determined_format = $this->GetFileFormat($formattest, $filename);

        // unable to determine file format
        if (!$determined_format) {
            fclose($fp);
            return $this->error('unable to determine file format');
        }

        // check for illegal ID3 tags
        if (isset($determined_format['fail_id3']) && (in_array('id3v1', $this->info['tags']) || in_array('id3v2', $this->info['tags']))) {
            if ($determined_format['fail_id3'] === 'ERROR') {
                fclose($fp);
                return $this->error('ID3 tags not allowed on this file type.');
            } elseif ($determined_format['fail_id3'] === 'WARNING') {
                $this->info['warning'][] = 'ID3 tags not allowed on this file type.';
            }
        }

        // check for illegal APE tags
        if (isset($determined_format['fail_ape']) && in_array('ape', $this->info['tags'])) {
            if ($determined_format['fail_ape'] === 'ERROR') {
                fclose($fp);
                return $this->error('APE tags not allowed on this file type.');
            } elseif ($determined_format['fail_ape'] === 'WARNING') {
                $this->info['warning'][] = 'APE tags not allowed on this file type.';
            }
        }

        // set mime type
        $this->info['mime_type'] = $determined_format['mime_type'];

        // supported format signature pattern detected, but module deleted
        if (!file_exists(GETID3_INCLUDEPATH.$determined_format['include'])) {
            fclose($fp);
            return $this->error('Format not supported, module "'.$determined_format['include'].'" was removed.');
        }

        // module requires iconv support
        if (!function_exists('iconv') && @$determined_format['iconv_req']) {
            return $this->error('iconv support is required for this module ('.$determined_format['include'].').');
        }

        // include module
        include_once(GETID3_INCLUDEPATH.$determined_format['include']);

        // instantiate module class
        $class_name = 'getid3_'.$determined_format['module'];
        if (!class_exists($class_name)) {
            return $this->error('Format not supported, module "'.$determined_format['include'].'" is corrupt.');
        }
        if (isset($determined_format['option'])) {
            $class = new $class_name($fp, $this->info, $determined_format['option']);
        } else {
            $class = new $class_name($fp, $this->info);
        }
        unset($class);

        // close file
        fclose($fp);

        // process all tags - copy to 'tags' and convert charsets
        if ($this->option_tags_process) {
            $this->HandleAllTags();
        }

        // perform more calculations
        if ($this->option_extra_info) {
            $this->ChannelsBitratePlaytimeCalculations();
            $this->CalculateCompressionRatioVideo();
            $this->CalculateCompressionRatioAudio();
            $this->CalculateReplayGain();
            $this->ProcessAudioStreams();
        }

        // get the MD5 sum of the audio/video portion of the file - without ID3/APE/Lyrics3/etc header/footer tags
        if ($this->option_md5_data) {
            // do not cald md5_data if md5_data_source is present - set by flac only - future MPC/SV8 too
            if (!$this->option_md5_data_source || empty($this->info['md5_data_source'])) {
                $this->getHashdata('md5');
            }
        }

        // get the SHA1 sum of the audio/video portion of the file - without ID3/APE/Lyrics3/etc header/footer tags
        if ($this->option_sha1_data) {
            $this->getHashdata('sha1');
        }

        // remove undesired keys
        $this->CleanUp();

        // restore magic_quotes_runtime setting
        set_magic_quotes_runtime($old_magic_quotes_runtime);

        // return info array
        return $this->info;
    }


    // private: error handling
    function error($message) {

        $this->CleanUp();

        $this->info['error'][] = $message;
        return $this->info;
    }


    // private: warning handling
    function warning($message) {
        $this->info['warning'][] = $message;
        return true;
    }


    // private: CleanUp
    function CleanUp() {

        // remove possible empty keys
        $AVpossibleEmptyKeys = array('dataformat', 'bits_per_sample', 'encoder_options', 'streams', 'bitrate');
        foreach ($AVpossibleEmptyKeys as $dummy => $key) {
            if (empty($this->info['audio'][$key]) && isset($this->info['audio'][$key])) {
                unset($this->info['audio'][$key]);
            }
            if (empty($this->info['video'][$key]) && isset($this->info['video'][$key])) {
                unset($this->info['video'][$key]);
            }
        }

        // remove empty root keys
        if (!empty($this->info)) {
            foreach ($this->info as $key => $value) {
                if (empty($this->info[$key]) && ($this->info[$key] !== 0) && ($this->info[$key] !== '0')) {
                    unset($this->info[$key]);
                }
            }
        }

        // remove meaningless entries from unknown-format files
        if (empty($this->info['fileformat'])) {
            if (isset($this->info['avdataoffset'])) {
                unset($this->info['avdataoffset']);
            }
            if (isset($this->info['avdataend'])) {
                unset($this->info['avdataend']);
            }
        }
    }


    // return array containing information about all supported formats
    function GetFileFormatArray() {
        static $format_info = array();
        if (empty($format_info)) {
            $format_info = array(

                // Audio formats

                // AC-3   - audio      - Dolby AC-3 / Dolby Digital
                'ac3'  => array(
                            'pattern'   => '^\x0B\x77',
                            'group'     => 'audio',
                            'module'    => 'ac3',
                            'mime_type' => 'audio/ac3',
                        ),

                // AAC  - audio       - Advanced Audio Coding (AAC) - ADIF format
                'adif' => array(
                            'pattern'   => '^ADIF',
                            'group'     => 'audio',
                            'module'    => 'aac',
                            'option'    => 'adif',
                            'mime_type' => 'application/octet-stream',
                            'fail_ape'  => 'WARNING',
                        ),


                // AAC  - audio       - Advanced Audio Coding (AAC) - ADTS format (very similar to MP3)
                'adts' => array(
                            'pattern'   => '^\xFF[\xF0-\xF1\xF8-\xF9]',
                            'group'     => 'audio',
                            'module'    => 'aac',
                            'option'    => 'adts',
                            'mime_type' => 'application/octet-stream',
                            'fail_ape'  => 'WARNING',
                        ),


                // AU   - audio       - NeXT/Sun AUdio (AU)
                'au'   => array(
                            'pattern'   => '^\.snd',
                            'group'     => 'audio',
                            'module'    => 'au',
                            'mime_type' => 'audio/basic',
                        ),

                // AVR  - audio       - Audio Visual Research
                'avr'  => array(
                            'pattern'   => '^2BIT',
                            'group'     => 'audio',
                            'module'    => 'avr',
                            'mime_type' => 'application/octet-stream',
                        ),

                // BONK - audio       - Bonk v0.9+
                'bonk' => array(
                            'pattern'   => '^\x00(BONK|INFO|META| ID3)',
                            'group'     => 'audio',
                            'module'    => 'bonk',
                            'mime_type' => 'audio/xmms-bonk',
                        ),

                // DSS  - audio       - Digital Speech Standard
                'dss'  => array(
                            'pattern'   => '^[\x02]dss',
                            'group'     => 'audio',
                            'module'    => 'dss',
                            'mime_type' => 'application/octet-stream',
                        ),

                // DTS  - audio       - Dolby Theatre System
                'dts'  => array(
                            'pattern'   => '^\x7F\xFE\x80\x01',
                            'group'     => 'audio',
                            'module'    => 'dts',
                            'mime_type' => 'audio/dts',
                        ),

                // FLAC - audio       - Free Lossless Audio Codec
                'flac' => array(
                            'pattern'   => '^fLaC',
                            'group'     => 'audio',
                            'module'    => 'flac',
                            'mime_type' => 'audio/x-flac',
                        ),

                // LA   - audio       - Lossless Audio (LA)
                'la'   => array(
                            'pattern'   => '^LA0[2-4]',
                            'group'     => 'audio',
                            'module'    => 'la',
                            'mime_type' => 'application/octet-stream',
                        ),

                // LPAC - audio       - Lossless Predictive Audio Compression (LPAC)
                'lpac' => array(
                            'pattern'   => '^LPAC',
                            'group'     => 'audio',
                            'module'    => 'lpac',
                            'mime_type' => 'application/octet-stream',
                        ),

                // MIDI - audio       - MIDI (Musical Instrument Digital Interface)
                'midi' => array(
                            'pattern'   => '^MThd',
                            'group'     => 'audio',
                            'module'    => 'midi',
                            'mime_type' => 'audio/midi',
                        ),

                // MAC  - audio       - Monkey's Audio Compressor
                'mac'  => array(
                            'pattern'   => '^MAC ',
                            'group'     => 'audio',
                            'module'    => 'monkey',
                            'mime_type' => 'application/octet-stream',
                        ),

// has been known to produce false matches in random files (e.g. JPEGs), leave out until more precise matching available
//                // MOD  - audio       - MODule (assorted sub-formats)
//                'mod'  => array(
//                            'pattern'   => '^.{1080}(M\\.K\\.|M!K!|FLT4|FLT8|[5-9]CHN|[1-3][0-9]CH)',
//                            'group'     => 'audio',
//                            'module'    => 'mod',
//                            'option'    => 'mod',
//                            'mime_type' => 'audio/mod',
//                        ),

                // MOD  - audio       - MODule (Impulse Tracker)
                'it'   => array(
                            'pattern'   => '^IMPM',
                            'group'     => 'audio',
                            'module'    => 'mod',
                            'option'    => 'it',
                            'mime_type' => 'audio/it',
                        ),

                // MOD  - audio       - MODule (eXtended Module, various sub-formats)
                'xm'   => array(
                            'pattern'   => '^Extended Module',
                            'group'     => 'audio',
                            'module'    => 'mod',
                            'option'    => 'xm',
                            'mime_type' => 'audio/xm',
                        ),

                // MOD  - audio       - MODule (ScreamTracker)
                's3m'  => array(
                            'pattern'   => '^.{44}SCRM',
                            'group'     => 'audio',
                            'module'    => 'mod',
                            'option'    => 's3m',
                            'mime_type' => 'audio/s3m',
                        ),

                // MPC  - audio       - Musepack / MPEGplus
                'mpc'  => array(
                            'pattern'   => '^(MPCK|MP\+|[\x00\x01\x10\x11\x40\x41\x50\x51\x80\x81\x90\x91\xC0\xC1\xD0\xD1][\x20-37][\x00\x20\x40\x60\x80\xA0\xC0\xE0])',
                            'group'     => 'audio',
                            'module'    => 'mpc',
                            'mime_type' => 'audio/x-musepack',
                        ),

                // MP3  - audio       - MPEG-audio Layer 3 (very similar to AAC-ADTS)
                'mp3'  => array(
                            'pattern'   => '^\xFF[\xE2-\xE7\xF2-\xF7\xFA-\xFF][\x00-\xEB]',
                            'group'     => 'audio',
                            'module'    => 'mp3',
                            'mime_type' => 'audio/mpeg',
                        ),

                // OFR  - audio       - OptimFROG
                'ofr'  => array(
                            'pattern'   => '^(\*RIFF|OFR)',
                            'group'     => 'audio',
                            'module'    => 'optimfrog',
                            'mime_type' => 'application/octet-stream',
                        ),

                // RKAU - audio       - RKive AUdio compressor
                'rkau' => array(
                            'pattern'   => '^RKA',
                            'group'     => 'audio',
                            'module'    => 'rkau',
                            'mime_type' => 'application/octet-stream',
                        ),

                // SHN  - audio       - Shorten
                'shn'  => array(
                            'pattern'   => '^ajkg',
                            'group'     => 'audio',
                            'module'    => 'shorten',
                            'mime_type' => 'audio/xmms-shn',
                            'fail_id3'  => 'ERROR',
                            'fail_ape'  => 'ERROR',
                        ),

                // TTA  - audio       - TTA Lossless Audio Compressor (http://tta.corecodec.org)
                'tta'  => array(
                            'pattern'   => '^TTA',  // could also be '^TTA(\x01|\x02|\x03|2|1)'
                            'group'     => 'audio',
                            'module'    => 'tta',
                            'mime_type' => 'application/octet-stream',
                        ),

                // VOC  - audio       - Creative Voice (VOC)
                'voc'  => array(
                            'pattern'   => '^Creative Voice File',
                            'group'     => 'audio',
                            'module'    => 'voc',
                            'mime_type' => 'audio/voc',
                        ),

                // VQF  - audio       - transform-domain weighted interleave Vector Quantization Format (VQF)
                'vqf'  => array(
                            'pattern'   => '^TWIN',
                            'group'     => 'audio',
                            'module'    => 'vqf',
                            'mime_type' => 'application/octet-stream',
                        ),

                // WV  - audio        - WavPack (v4.0+)
                'wv'   => array(
                            'pattern'   => '^wvpk',
                            'group'     => 'audio',
                            'module'    => 'wavpack',
                            'mime_type' => 'application/octet-stream',
                        ),


                // Audio-Video formats

                // ASF  - audio/video - Advanced Streaming Format, Windows Media Video, Windows Media Audio
                'asf'  => array(
                            'pattern'   => '^\x30\x26\xB2\x75\x8E\x66\xCF\x11\xA6\xD9\x00\xAA\x00\x62\xCE\x6C',
                            'group'     => 'audio-video',
                            'module'    => 'asf',
                            'mime_type' => 'video/x-ms-asf',
                            'iconv_req' => false,
                        ),

                // BINK - audio/video - Bink / Smacker
                'bink' => array(
                            'pattern'   => '^(BIK|SMK)',
                            'group'     => 'audio-video',
                            'module'    => 'bink',
                            'mime_type' => 'application/octet-stream',
                        ),

                // FLV  - audio/video - FLash Video
                'flv' => array(
                            'pattern'   => '^FLV\x01',
                            'group'     => 'audio-video',
                            'module'    => 'flv',
                            'mime_type' => 'video/x-flv',
                        ),

                // MKAV - audio/video - Mastroka
                'matroska' => array(
                            'pattern'   => '^\x1A\x45\xDF\xA3',
                            'group'     => 'audio-video',
                            'module'    => 'matroska',
                            'mime_type' => 'video/x-matroska', // may also be audio/x-matroska
                        ),

                // MPEG - audio/video - MPEG (Moving Pictures Experts Group)
                'mpeg' => array(
                            'pattern'   => '^\x00\x00\x01(\xBA|\xB3)',
                            'group'     => 'audio-video',
                            'module'    => 'mpeg',
                            'mime_type' => 'video/mpeg',
                        ),

                // NSV  - audio/video - Nullsoft Streaming Video (NSV)
                'nsv'  => array(
                            'pattern'   => '^NSV[sf]',
                            'group'     => 'audio-video',
                            'module'    => 'nsv',
                            'mime_type' => 'application/octet-stream',
                        ),

                // Ogg  - audio/video - Ogg (Ogg-Vorbis, Ogg-FLAC, Speex, Ogg-Theora(*), Ogg-Tarkin(*))
                'ogg'  => array(
                            'pattern'   => '^OggS',
                            'group'     => 'audio',
                            'module'    => 'ogg',
                            'mime_type' => 'application/ogg',
                            'fail_id3'  => 'WARNING',
                            'fail_ape'  => 'WARNING',
                        ),

                // QT   - audio/video - Quicktime
                'quicktime' => array(
                            'pattern'   => '^.{4}(cmov|free|ftyp|mdat|moov|pnot|skip|wide)',
                            'group'     => 'audio-video',
                            'module'    => 'quicktime',
                            'mime_type' => 'video/quicktime',
                        ),

                // RIFF - audio/video - Resource Interchange File Format (RIFF) / WAV / AVI / CD-audio / SDSS = renamed variant used by SmartSound QuickTracks (www.smartsound.com) / FORM = Audio Interchange File Format (AIFF)
                'riff' => array(
                            'pattern'   => '^(RIFF|SDSS|FORM)',
                            'group'     => 'audio-video',
                            'module'    => 'riff',
                            'mime_type' => 'audio/x-wave',
                            'fail_ape'  => 'WARNING',
                        ),

                // Real - audio/video - RealAudio, RealVideo
                'real' => array(
                            'pattern'   => '^(\\.RMF|\\.ra)',
                            'group'     => 'audio-video',
                            'module'    => 'real',
                            'mime_type' => 'audio/x-realaudio',
                        ),

                // SWF - audio/video - ShockWave Flash
                'swf' => array(
                            'pattern'   => '^(F|C)WS',
                            'group'     => 'audio-video',
                            'module'    => 'swf',
                            'mime_type' => 'application/x-shockwave-flash',
                        ),


                // Still-Image formats

                // BMP  - still image - Bitmap (Windows, OS/2; uncompressed, RLE8, RLE4)
                'bmp'  => array(
                            'pattern'   => '^BM',
                            'group'     => 'graphic',
                            'module'    => 'bmp',
                            'mime_type' => 'image/bmp',
                            'fail_id3'  => 'ERROR',
                            'fail_ape'  => 'ERROR',
                        ),

                // GIF  - still image - Graphics Interchange Format
                'gif'  => array(
                            'pattern'   => '^GIF',
                            'group'     => 'graphic',
                            'module'    => 'gif',
                            'mime_type' => 'image/gif',
                            'fail_id3'  => 'ERROR',
                            'fail_ape'  => 'ERROR',
                        ),

                // JPEG - still image - Joint Photographic Experts Group (JPEG)
                'jpg'  => array(
                            'pattern'   => '^\xFF\xD8\xFF',
                            'group'     => 'graphic',
                            'module'    => 'jpg',
                            'mime_type' => 'image/jpeg',
                            'fail_id3'  => 'ERROR',
                            'fail_ape'  => 'ERROR',
                        ),

                // PCD  - still image - Kodak Photo CD
                'pcd'  => array(
                            'pattern'   => '^.{2048}PCD_IPI\x00',
                            'group'     => 'graphic',
                            'module'    => 'pcd',
                            'mime_type' => 'image/x-photo-cd',
                            'fail_id3'  => 'ERROR',
                            'fail_ape'  => 'ERROR',
                        ),


                // PNG  - still image - Portable Network Graphics (PNG)
                'png'  => array(
                            'pattern'   => '^\x89\x50\x4E\x47\x0D\x0A\x1A\x0A',
                            'group'     => 'graphic',
                            'module'    => 'png',
                            'mime_type' => 'image/png',
                            'fail_id3'  => 'ERROR',
                            'fail_ape'  => 'ERROR',
                        ),


                // SVG  - still image - Scalable Vector Graphics (SVG)
                'svg'  => array(
                            'pattern'   => '<!DOCTYPE svg PUBLIC ',
                            'group'     => 'graphic',
                            'module'    => 'svg',
                            'mime_type' => 'image/svg+xml',
                            'fail_id3'  => 'ERROR',
                            'fail_ape'  => 'ERROR',
                        ),


                // TIFF  - still image - Tagged Information File Format (TIFF)
                'tiff' => array(
                            'pattern'   => '^(II\x2A\x00|MM\x00\x2A)',
                            'group'     => 'graphic',
                            'module'    => 'tiff',
                            'mime_type' => 'image/tiff',
                            'fail_id3'  => 'ERROR',
                            'fail_ape'  => 'ERROR',
                        ),


                // Data formats

                // ISO  - data        - International Standards Organization (ISO) CD-ROM Image
                'iso'  => array(
                            'pattern'   => '^.{32769}CD001',
                            'group'     => 'misc',
                            'module'    => 'iso',
                            'mime_type' => 'application/octet-stream',
                            'fail_id3'  => 'ERROR',
                            'fail_ape'  => 'ERROR',
                            'iconv_req' => false,
                        ),

                // RAR  - data        - RAR compressed data
                'rar'  => array(
                            'pattern'   => '^Rar\!',
                            'group'     => 'archive',
                            'module'    => 'rar',
                            'mime_type' => 'application/octet-stream',
                            'fail_id3'  => 'ERROR',
                            'fail_ape'  => 'ERROR',
                        ),

                // SZIP - audio/data  - SZIP compressed data
                'szip' => array(
                            'pattern'   => '^SZ\x0A\x04',
                            'group'     => 'archive',
                            'module'    => 'szip',
                            'mime_type' => 'application/octet-stream',
                            'fail_id3'  => 'ERROR',
                            'fail_ape'  => 'ERROR',
                        ),

                // TAR  - data        - TAR compressed data
                'tar'  => array(
                            'pattern'   => '^.{100}[0-9\x20]{7}\x00[0-9\x20]{7}\x00[0-9\x20]{7}\x00[0-9\x20\x00]{12}[0-9\x20\x00]{12}',
                            'group'     => 'archive',
                            'module'    => 'tar',
                            'mime_type' => 'application/x-tar',
                            'fail_id3'  => 'ERROR',
                            'fail_ape'  => 'ERROR',
                        ),

                // GZIP  - data        - GZIP compressed data
                'gz'  => array(
                            'pattern'   => '^\x1F\x8B\x08',
                            'group'     => 'archive',
                            'module'    => 'gzip',
                            'mime_type' => 'application/x-gzip',
                            'fail_id3'  => 'ERROR',
                            'fail_ape'  => 'ERROR',
                        ),

                // ZIP  - data         - ZIP compressed data
                'zip'  => array(
                            'pattern'   => '^PK\x03\x04',
                            'group'     => 'archive',
                            'module'    => 'zip',
                            'mime_type' => 'application/zip',
                            'fail_id3'  => 'ERROR',
                            'fail_ape'  => 'ERROR',
                        ),


                // Misc other formats

                // PAR2 - data        - Parity Volume Set Specification 2.0
                'par2' => array (
                            'pattern'   => '^PAR2\x00PKT',
                            'group'     => 'misc',
                            'module'    => 'par2',
                            'mime_type' => 'application/octet-stream',
                            'fail_id3'  => 'ERROR',
                            'fail_ape'  => 'ERROR',
                        ),

                // PDF  - data        - Portable Document Format
                'pdf'  => array(
                            'pattern'   => '^\x25PDF',
                            'group'     => 'misc',
                            'module'    => 'pdf',
                            'mime_type' => 'application/pdf',
                            'fail_id3'  => 'ERROR',
                            'fail_ape'  => 'ERROR',
                        ),

                // MSOFFICE  - data   - ZIP compressed data
                'msoffice' => array(
                            'pattern'   => '^\xD0\xCF\x11\xE0', // D0CF11E == DOCFILE == Microsoft Office Document
                            'group'     => 'misc',
                            'module'    => 'msoffice',
                            'mime_type' => 'application/octet-stream',
                            'fail_id3'  => 'ERROR',
                            'fail_ape'  => 'ERROR',
                        ),

                 // CUE  - data       - CUEsheet (index to single-file disc images)
                 'cue' => array(
                            'pattern'   => '', // empty pattern means cannot be automatically detected, will fall through all other formats and match based on filename and very basic file contents
                            'group'     => 'misc',
                            'module'    => 'cue',
                            'mime_type' => 'application/octet-stream',
                           ),

            );
        }

        return $format_info;
    }



    function GetFileFormat(&$filedata, $filename='') {
        // this function will determine the format of a file based on usually
        // the first 2-4 bytes of the file (8 bytes for PNG, 16 bytes for JPG,
        // and in the case of ISO CD image, 6 bytes offset 32kb from the start
        // of the file).

        // Identify file format - loop through $format_info and detect with reg expr
        foreach ($this->GetFileFormatArray() as $format_name => $info) {
            // Using preg_match() instead of ereg() - much faster
            // The /s switch on preg_match() forces preg_match() NOT to treat
            // newline (0x0A) characters as special chars but do a binary match
            if (@$info['pattern'] && preg_match('/'.$info['pattern'].'/s', $filedata)) {
                $info['include'] = 'module.'.$info['group'].'.'.$info['module'].'.php';
                return $info;
            }
        }


        if (preg_match('/\.mp[123a]$/i', $filename)) {
            // Too many mp3 encoders on the market put gabage in front of mpeg files
            // use assume format on these if format detection failed
            $GetFileFormatArray = $this->GetFileFormatArray();
            $info = $GetFileFormatArray['mp3'];
            $info['include'] = 'module.'.$info['group'].'.'.$info['module'].'.php';
            return $info;
        } elseif (preg_match('/\.cue$/i', $filename) && preg_match('#TRACK [0-9]{2} (AUDIO|MODE[12]/(2048|2336|2352))#', $filedata)) {
            // there's not really a useful consistent "magic" at the beginning of .cue files to identify them
            // so until I think of something better, just go by filename if all other format checks fail
            // and verify there's at least one instance of "TRACK xx AUDIO" in the file
            $GetFileFormatArray = $this->GetFileFormatArray();
            $info = $GetFileFormatArray['cue'];
            $info['include']   = 'module.'.$info['group'].'.'.$info['module'].'.php';
            return $info;
        }

        return false;
    }


    // converts array to $encoding charset from $this->encoding
    function CharConvert(&$array, $encoding) {

        // identical encoding - end here
        if ($encoding == $this->encoding) {
            return;
        }

        // loop thru array
        foreach ($array as $key => $value) {

            // go recursive
            if (is_array($value)) {
                $this->CharConvert($array[$key], $encoding);
            }

            // convert string
            elseif (is_string($value)) {
                $array[$key] = trim(getid3_lib::iconv_fallback($encoding, $this->encoding, $value));
            }
        }
    }


    function HandleAllTags() {

        // key name => array (tag name, character encoding)
        static $tags;
        if (empty($tags)) {
            $tags = array(
                'asf'       => array('asf'           , 'UTF-16LE'),
                'midi'      => array('midi'          , 'ISO-8859-1'),
                'nsv'       => array('nsv'           , 'ISO-8859-1'),
                'ogg'       => array('vorbiscomment' , 'UTF-8'),
                'png'       => array('png'           , 'UTF-8'),
                'tiff'      => array('tiff'          , 'ISO-8859-1'),
                'quicktime' => array('quicktime'     , 'ISO-8859-1'),
                'real'      => array('real'          , 'ISO-8859-1'),
                'vqf'       => array('vqf'           , 'ISO-8859-1'),
                'zip'       => array('zip'           , 'ISO-8859-1'),
                'riff'      => array('riff'          , 'ISO-8859-1'),
                'lyrics3'   => array('lyrics3'       , 'ISO-8859-1'),
                'id3v1'     => array('id3v1'         , $this->encoding_id3v1),
                'id3v2'     => array('id3v2'         , 'UTF-8'), // not according to the specs (every frame can have a different encoding), but getID3() force-converts all encodings to UTF-8
                'ape'       => array('ape'           , 'UTF-8'),
                'cue'       => array('cue'           , 'ISO-8859-1'),
            );
        }

        // loop thru comments array
        foreach ($tags as $comment_name => $tagname_encoding_array) {
            list($tag_name, $encoding) = $tagname_encoding_array;

            // fill in default encoding type if not already present
            if (isset($this->info[$comment_name]) && !isset($this->info[$comment_name]['encoding'])) {
                $this->info[$comment_name]['encoding'] = $encoding;
            }

            // copy comments if key name set
            if (!empty($this->info[$comment_name]['comments'])) {

                foreach ($this->info[$comment_name]['comments'] as $tag_key => $valuearray) {
                    foreach ($valuearray as $key => $value) {
                        if (strlen(trim($value)) > 0) {
                            $this->info['tags'][trim($tag_name)][trim($tag_key)][] = $value; // do not trim!! Unicode characters will get mangled if trailing nulls are removed!
                        }
                    }
                }

                if (!isset($this->info['tags'][$tag_name])) {
                    // comments are set but contain nothing but empty strings, so skip
                    continue;
                }

                if ($this->option_tags_html) {
                    foreach ($this->info['tags'][$tag_name] as $tag_key => $valuearray) {
                        foreach ($valuearray as $key => $value) {
                            if (is_string($value)) {
                                //$this->info['tags_html'][$tag_name][$tag_key][$key] = getid3_lib::MultiByteCharString2HTML($value, $encoding);
                                $this->info['tags_html'][$tag_name][$tag_key][$key] = str_replace('&#0;', '', getid3_lib::MultiByteCharString2HTML($value, $encoding));
                            } else {
                                $this->info['tags_html'][$tag_name][$tag_key][$key] = $value;
                            }
                        }
                    }
                }

                $this->CharConvert($this->info['tags'][$tag_name], $encoding);           // only copy gets converted!
            }

        }
        return true;
    }


    function getHashdata($algorithm) {
        switch ($algorithm) {
            case 'md5':
            case 'sha1':
                break;

            default:
                return $this->error('bad algorithm "'.$algorithm.'" in getHashdata()');
                break;
        }

        if ((@$this->info['fileformat'] == 'ogg') && (@$this->info['audio']['dataformat'] == 'vorbis')) {

            // We cannot get an identical md5_data value for Ogg files where the comments
            // span more than 1 Ogg page (compared to the same audio data with smaller
            // comments) using the normal getID3() method of MD5'ing the data between the
            // end of the comments and the end of the file (minus any trailing tags),
            // because the page sequence numbers of the pages that the audio data is on
            // do not match. Under normal circumstances, where comments are smaller than
            // the nominal 4-8kB page size, then this is not a problem, but if there are
            // very large comments, the only way around it is to strip off the comment
            // tags with vorbiscomment and MD5 that file.
            // This procedure must be applied to ALL Ogg files, not just the ones with
            // comments larger than 1 page, because the below method simply MD5's the
            // whole file with the comments stripped, not just the portion after the
            // comments block (which is the standard getID3() method.

            // The above-mentioned problem of comments spanning multiple pages and changing
            // page sequence numbers likely happens for OggSpeex and OggFLAC as well, but
            // currently vorbiscomment only works on OggVorbis files.

            if ((bool) ini_get('safe_mode')) {

                $this->info['warning'][] = 'Failed making system call to vorbiscomment.exe - '.$algorithm.'_data is incorrect - error returned: PHP running in Safe Mode (backtick operator not available)';
                $this->info[$algorithm.'_data']  = false;

            } else {

                // Prevent user from aborting script
                $old_abort = ignore_user_abort(true);

                // Create empty file
                $empty = tempnam('*', 'getID3');
                touch($empty);


                // Use vorbiscomment to make temp file without comments
                $temp = tempnam('*', 'getID3');
                $file = $this->info['filenamepath'];

                if (GETID3_OS_ISWINDOWS) {

                    if (file_exists(GETID3_HELPERAPPSDIR.'vorbiscomment.exe')) {

                        $commandline = '"'.GETID3_HELPERAPPSDIR.'vorbiscomment.exe" -w -c "'.$empty.'" "'.$file.'" "'.$temp.'"';
                        $VorbisCommentError = `$commandline`;

                    } else {

                        $VorbisCommentError = 'vorbiscomment.exe not found in '.GETID3_HELPERAPPSDIR;

                    }

                } else {

                    $commandline = 'vorbiscomment -w -c "'.$empty.'" "'.$file.'" "'.$temp.'" 2>&1';
                    $commandline = 'vorbiscomment -w -c '.escapeshellarg($empty).' '.escapeshellarg($file).' '.escapeshellarg($temp).' 2>&1';
                    $VorbisCommentError = `$commandline`;

                }

                if (!empty($VorbisCommentError)) {

                    $this->info['warning'][]         = 'Failed making system call to vorbiscomment(.exe) - '.$algorithm.'_data will be incorrect. If vorbiscomment is unavailable, please download from http://www.vorbis.com/download.psp and put in the getID3() directory. Error returned: '.$VorbisCommentError;
                    $this->info[$algorithm.'_data']  = false;

                } else {

                    // Get hash of newly created file
                    switch ($algorithm) {
                        case 'md5':
                            $this->info[$algorithm.'_data'] = getid3_lib::md5_file($temp);
                            break;

                        case 'sha1':
                            $this->info[$algorithm.'_data'] = getid3_lib::sha1_file($temp);
                            break;
                    }
                }

                // Clean up
                unlink($empty);
                unlink($temp);

                // Reset abort setting
                ignore_user_abort($old_abort);

            }

        } else {

            if (!empty($this->info['avdataoffset']) || (isset($this->info['avdataend']) && ($this->info['avdataend'] < $this->info['filesize']))) {

                // get hash from part of file
                $this->info[$algorithm.'_data'] = getid3_lib::hash_data($this->info['filenamepath'], $this->info['avdataoffset'], $this->info['avdataend'], $algorithm);

            } else {

                // get hash from whole file
                switch ($algorithm) {
                    case 'md5':
                        $this->info[$algorithm.'_data'] = getid3_lib::md5_file($this->info['filenamepath']);
                        break;

                    case 'sha1':
                        $this->info[$algorithm.'_data'] = getid3_lib::sha1_file($this->info['filenamepath']);
                        break;
                }
            }

        }
        return true;
    }


    function ChannelsBitratePlaytimeCalculations() {

        // set channelmode on audio
        if (@$this->info['audio']['channels'] == '1') {
            $this->info['audio']['channelmode'] = 'mono';
        } elseif (@$this->info['audio']['channels'] == '2') {
            $this->info['audio']['channelmode'] = 'stereo';
        }

        // Calculate combined bitrate - audio + video
        $CombinedBitrate  = 0;
        $CombinedBitrate += (isset($this->info['audio']['bitrate']) ? $this->info['audio']['bitrate'] : 0);
        $CombinedBitrate += (isset($this->info['video']['bitrate']) ? $this->info['video']['bitrate'] : 0);
        if (($CombinedBitrate > 0) && empty($this->info['bitrate'])) {
            $this->info['bitrate'] = $CombinedBitrate;
        }
        //if ((isset($this->info['video']) && !isset($this->info['video']['bitrate'])) || (isset($this->info['audio']) && !isset($this->info['audio']['bitrate']))) {
        //    // for example, VBR MPEG video files cannot determine video bitrate:
        //    // should not set overall bitrate and playtime from audio bitrate only
        //    unset($this->info['bitrate']);
        //}

        // video bitrate undetermined, but calculable
        if (isset($this->info['video']['dataformat']) && $this->info['video']['dataformat'] && (!isset($this->info['video']['bitrate']) || ($this->info['video']['bitrate'] == 0))) {
            // if video bitrate not set
            if (isset($this->info['audio']['bitrate']) && ($this->info['audio']['bitrate'] > 0) && ($this->info['audio']['bitrate'] == $this->info['bitrate'])) {
                // AND if audio bitrate is set to same as overall bitrate
                if (isset($this->info['playtime_seconds']) && ($this->info['playtime_seconds'] > 0)) {
                    // AND if playtime is set
                    if (isset($this->info['avdataend']) && isset($this->info['avdataoffset'])) {
                        // AND if AV data offset start/end is known
                        // THEN we can calculate the video bitrate
                        $this->info['bitrate'] = round((($this->info['avdataend'] - $this->info['avdataoffset']) * 8) / $this->info['playtime_seconds']);
                        $this->info['video']['bitrate'] = $this->info['bitrate'] - $this->info['audio']['bitrate'];
                    }
                }
            }
        }

        if ((!isset($this->info['playtime_seconds']) || ($this->info['playtime_seconds'] <= 0)) && !empty($this->info['bitrate'])) {
            $this->info['playtime_seconds'] = (($this->info['avdataend'] - $this->info['avdataoffset']) * 8) / $this->info['bitrate'];
        }

        if (!isset($this->info['bitrate']) && !empty($this->info['playtime_seconds'])) {
            $this->info['bitrate'] = (($this->info['avdataend'] - $this->info['avdataoffset']) * 8) / $this->info['playtime_seconds'];
        }
        if (isset($this->info['bitrate']) && empty($this->info['audio']['bitrate']) && empty($this->info['video']['bitrate'])) {
            if (isset($this->info['audio']['dataformat']) && empty($this->info['video']['resolution_x'])) {
                // audio only
                $this->info['audio']['bitrate'] = $this->info['bitrate'];
            } elseif (isset($this->info['video']['resolution_x']) && empty($this->info['audio']['dataformat'])) {
                // video only
                $this->info['video']['bitrate'] = $this->info['bitrate'];
            }
        }

        // Set playtime string
        if (!empty($this->info['playtime_seconds']) && empty($this->info['playtime_string'])) {
            $this->info['playtime_string'] = getid3_lib::PlaytimeString($this->info['playtime_seconds']);
        }
    }


    function CalculateCompressionRatioVideo() {
        if (empty($this->info['video'])) {
            return false;
        }
        if (empty($this->info['video']['resolution_x']) || empty($this->info['video']['resolution_y'])) {
            return false;
        }
        if (empty($this->info['video']['bits_per_sample'])) {
            return false;
        }

        switch ($this->info['video']['dataformat']) {
            case 'bmp':
            case 'gif':
            case 'jpeg':
            case 'jpg':
            case 'png':
            case 'tiff':
                $FrameRate = 1;
                $PlaytimeSeconds = 1;
                $BitrateCompressed = $this->info['filesize'] * 8;
                break;

            default:
                if (!empty($this->info['video']['frame_rate'])) {
                    $FrameRate = $this->info['video']['frame_rate'];
                } else {
                    return false;
                }
                if (!empty($this->info['playtime_seconds'])) {
                    $PlaytimeSeconds = $this->info['playtime_seconds'];
                } else {
                    return false;
                }
                if (!empty($this->info['video']['bitrate'])) {
                    $BitrateCompressed = $this->info['video']['bitrate'];
                } else {
                    return false;
                }
                break;
        }
        $BitrateUncompressed = $this->info['video']['resolution_x'] * $this->info['video']['resolution_y'] * $this->info['video']['bits_per_sample'] * $FrameRate;

        $this->info['video']['compression_ratio'] = $BitrateCompressed / $BitrateUncompressed;
        return true;
    }


    function CalculateCompressionRatioAudio() {
        if (empty($this->info['audio']['bitrate']) || empty($this->info['audio']['channels']) || empty($this->info['audio']['sample_rate'])) {
            return false;
        }
        $this->info['audio']['compression_ratio'] = $this->info['audio']['bitrate'] / ($this->info['audio']['channels'] * $this->info['audio']['sample_rate'] * (!empty($this->info['audio']['bits_per_sample']) ? $this->info['audio']['bits_per_sample'] : 16));

        if (!empty($this->info['audio']['streams'])) {
            foreach ($this->info['audio']['streams'] as $streamnumber => $streamdata) {
                if (!empty($streamdata['bitrate']) && !empty($streamdata['channels']) && !empty($streamdata['sample_rate'])) {
                    $this->info['audio']['streams'][$streamnumber]['compression_ratio'] = $streamdata['bitrate'] / ($streamdata['channels'] * $streamdata['sample_rate'] * (!empty($streamdata['bits_per_sample']) ? $streamdata['bits_per_sample'] : 16));
                }
            }
        }
        return true;
    }


    function CalculateReplayGain() {
        if (isset($this->info['replay_gain'])) {
            $this->info['replay_gain']['reference_volume'] = 89;
            if (isset($this->info['replay_gain']['track']['adjustment'])) {
                $this->info['replay_gain']['track']['volume'] = $this->info['replay_gain']['reference_volume'] - $this->info['replay_gain']['track']['adjustment'];
            }
            if (isset($this->info['replay_gain']['album']['adjustment'])) {
                $this->info['replay_gain']['album']['volume'] = $this->info['replay_gain']['reference_volume'] - $this->info['replay_gain']['album']['adjustment'];
            }

            if (isset($this->info['replay_gain']['track']['peak'])) {
                $this->info['replay_gain']['track']['max_noclip_gain'] = 0 - getid3_lib::RGADamplitude2dB($this->info['replay_gain']['track']['peak']);
            }
            if (isset($this->info['replay_gain']['album']['peak'])) {
                $this->info['replay_gain']['album']['max_noclip_gain'] = 0 - getid3_lib::RGADamplitude2dB($this->info['replay_gain']['album']['peak']);
            }
        }
        return true;
    }

    function ProcessAudioStreams() {
        if (!empty($this->info['audio']['bitrate']) || !empty($this->info['audio']['channels']) || !empty($this->info['audio']['sample_rate'])) {
            if (!isset($this->info['audio']['streams'])) {
                foreach ($this->info['audio'] as $key => $value) {
                    if ($key != 'streams') {
                        $this->info['audio']['streams'][0][$key] = $value;
                    }
                }
            }
        }
        return true;
    }

    function getid3_tempnam() {
        return tempnam($this->tempdir, 'gI3');
    }

}

?>