GetId3Core.php

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<?php

namespace GetId3;

use GetId3\Lib\Helper;
use GetId3\Exception\DefaultException;

//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
//                                                             //
// Please see readme.txt for more information                  //
//                                                            ///

class GetId3Core
{
    // public: Settings
    public $encoding = 'UTF-8';        // CASE SENSITIVE! - i.e. (must be supported by iconv()). Examples:  ISO-8859-1  UTF-8  UTF-16  UTF-16BE
    public $encoding_id3v1 = 'ISO-8859-1';   // Should always be 'ISO-8859-1', but some tags may be written in other encodings such as 'EUC-CN' or 'CP1252'
    // public: Optional tag checks - disable for speed.
    public $option_tag_id3v1 = true;  // Read and process ID3v1 tags
    public $option_tag_id3v2 = true;  // Read and process ID3v2 tags
    public $option_tag_lyrics3 = true;  // Read and process Lyrics3 tags
    public $option_tag_apetag = true;  // Read and process APE tags
    public $option_tags_process = true;  // Copy tags to root key 'tags' and encode to $this->encoding
    public $option_tags_html = true;  // Copy tags to root key 'tags_html' properly translated from various encodings to HTML entities
    // public: Optional tag/comment calucations
    public $option_extra_info = true;  // Calculate additional info such as bitrate, channelmode etc
    // public: Optional handling of embedded attachments (e.g. images)
    public $option_save_attachments = true; // defaults to true (ATTACHMENTS_INLINE) for backward compatibility
    // public: Optional calculations
    public $option_md5_data = false; // Get MD5 sum of data part - slow
    public $option_md5_data_source = false; // Use MD5 of source file if availble - only FLAC and OptimFROG
    public $option_sha1_data = false; // Get SHA1 sum of data part - slow
    public $option_max_2gb_check = null;  // Check whether file is larger than 2GB and thus not supported by 32-bit PHP (null: auto-detect based on PHP_INT_MAX)
    // public: Read buffer size in bytes
    public $option_fread_buffer_size = 32768;
    // Public variables
    public $filename;                         // Filename of file being analysed.
    public $fp;                               // Filepointer to file being analysed.
    public $info;                             // Result array.
    // Protected variables
    protected $startup_error = '';
    protected $startup_warning = '';
    protected $memory_limit = 0;
    public $tempdir;
    protected static $TempDir; // $TempDir = '/something/else/';  // feel free to override temp dir here if it works better for your system
    protected static $IncludePath;
    protected static $EnvironmentIsWindows;
    protected static $HelperAppsDir;

    const VERSION = '1.9.4-20120530';
    const FREAD_BUFFER_SIZE = 32768;
    const ATTACHMENTS_NONE = false;
    const ATTACHMENTS_INLINE = true;

    public function __construct()
    {
        $this->tempdir = self::getTempDir();
        // Check for PHP version
        $required_php_version = '5.0.5';
        if (version_compare(PHP_VERSION, $required_php_version, '<')) {
            $this->startup_error .= 'getID3() requires PHP v' . $required_php_version . ' or higher - you are running v' . PHP_VERSION;

            return false;
        }

        // Check memory
        $this->memory_limit = ini_get('memory_limit');
        if (preg_match('#([0-9]+)M#i', $this->memory_limit, $matches)) {
            // could be stored as "16M" rather than 16777216 for example
            $this->memory_limit = $matches[1] * 1048576;
        } elseif (preg_match('#([0-9]+)G#i', $this->memory_limit, $matches)) { // The 'G' modifier is available since PHP 5.1.0
            // could be stored as "2G" rather than 2147483648 for example
            $this->memory_limit = $matches[1] * 1073741824;
        }
        if ($this->memory_limit <= 0) {
            // memory limits probably disabled
        } elseif ($this->memory_limit <= 4194304) {
            $this->startup_error .= 'PHP has less than 4MB available memory and will very likely run out. Increase memory_limit in php.ini';
        } elseif ($this->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 (preg_match('#(1|ON)#i', 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.');
        }

        if (intval(ini_get('mbstring.func_overload')) > 0) {
            $this->warning('WARNING: php.ini contains "mbstring.func_overload = ' . ini_get('mbstring.func_overload') . '", this may break things.');
        }

        // Check for magic_quotes_runtime
        if (function_exists('get_magic_quotes_runtime')) {
            if (get_magic_quotes_runtime()) {
                return $this->startup_error('magic_quotes_runtime must be disabled before running GetId3Core(). Surround GetId3 block by set_magic_quotes_runtime(0) and set_magic_quotes_runtime(1).');
            }
        }

        // Check for magic_quotes_gpc
        if (function_exists('magic_quotes_gpc')) {
            if (get_magic_quotes_gpc()) {
                return $this->startup_error('magic_quotes_gpc must be disabled before running GetId3Core(). Surround GetId3 block by set_magic_quotes_gpc(0) and set_magic_quotes_gpc(1).');
            }
        }

        // Check support library
        if (!class_exists('GetId3\\Lib\\Helper')) {
            $this->startup_error .= str_replace('\\', DIRECTORY_SEPARATOR, 'GetId3\\Lib\\Helper') . '.php is missing or corrupt';
        }

        if ($this->option_max_2gb_check === null) {
            $this->option_max_2gb_check = (PHP_INT_MAX <= 2147483647);
        }

        $this->setHelperAppsDir();

        return true;
    }

    protected function setHelperAppsDir()
    {
        // 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
        // This path cannot contain spaces, but the below code will attempt to get the
        //   8.3-equivalent path automatically
        // IMPORTANT: This path must include the trailing slash
        if (self::$EnvironmentIsWindows && null === self::$HelperAppsDir) {

            $helperappsdir = self::$IncludePath . 'Resources' . DIRECTORY_SEPARATOR . 'helperapps'; // must not have any space in this path

            if (!is_dir($helperappsdir)) {
                $this->startup_warning .= '"' . $helperappsdir . '" cannot be defined as self::getHelperAppsDir() because it does not exist';
            } elseif (strpos(realpath($helperappsdir), ' ') !== false) {
                $DirPieces = explode(DIRECTORY_SEPARATOR,
                                     realpath($helperappsdir));
                $path_so_far = array();
                foreach ($DirPieces as $key => $value) {
                    if (strpos($value, ' ') !== false) {
                        if (!empty($path_so_far)) {
                            $commandline = 'dir /x ' . escapeshellarg(implode(DIRECTORY_SEPARATOR,
                                                                              $path_so_far));
                            $dir_listing = `$commandline`;
                            $lines = explode("\n", $dir_listing);
                            foreach ($lines as $line) {
                                $line = trim($line);
                                if (preg_match('#^([0-9/]{10}) +([0-9:]{4,5}( [AP]M)?) +(<DIR>|[0-9,]+) +([^ ]{0,11}) +(.+)$#',
                                               $line, $matches)) {
                                    list($dummy, $date, $time, $ampm, $filesize, $shortname, $filename) = $matches;
                                    if ((strtoupper($filesize) == '<DIR>') && (strtolower($filename) == strtolower($value))) {
                                        $value = $shortname;
                                    }
                                }
                            }
                        } else {
                            $this->startup_warning .= 'self::getHelperAppsDir() must not have any spaces in it - use 8dot3 naming convention if neccesary. You can run "dir /x" from the commandline to see the correct 8.3-style names.';
                        }
                    }
                    $path_so_far[] = $value;
                }
                $helperappsdir = implode(DIRECTORY_SEPARATOR, $path_so_far);
            }
            self::$HelperAppsDir = $helperappsdir . DIRECTORY_SEPARATOR;
        }
    }

    public static function getHelperAppsDir()
    {
        return self::$HelperAppsDir;
    }

    public function version()
    {
        return self::VERSION;
    }

    public function fread_buffer_size()
    {
        return $this->option_fread_buffer_size;
    }

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

        return true;
    }

    public function openfile($filename)
    {
        try {
            if (!empty($this->startup_error)) {
                throw new DefaultException($this->startup_error);
            }
            if (!empty($this->startup_warning)) {
                $this->warning($this->startup_warning);
            }

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

            // remote files not supported
            if (preg_match('/^(ht|f)tp:\/\//', $filename)) {
                throw new DefaultException('Remote files are not supported - please copy the file locally first');
            }

            $filename = str_replace('/', DIRECTORY_SEPARATOR, $filename);
            $filename = preg_replace('#(.+)' . preg_quote(DIRECTORY_SEPARATOR) . '{2,}#U',
                                                          '\1' . DIRECTORY_SEPARATOR,
                                                          $filename);

            // open local file
            if (is_readable($filename) && is_file($filename) && ($this->fp = fopen($filename,
                                                                                   'rb'))) {
                // great
            } else {
                throw new DefaultException('Could not open "' . $filename . '" (does not exist, or is not a file)');
            }

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

            // option_max_2gb_check
            if ($this->option_max_2gb_check) {
                // PHP (32-bit all, and 64-bit Windows) doesn't support integers larger than 2^31 (~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
                $fseek = fseek($this->fp, 0, SEEK_END);
                if (($fseek < 0) || (($this->info['filesize'] != 0) && (ftell($this->fp) == 0)) ||
                    ($this->info['filesize'] < 0) ||
                    (ftell($this->fp) < 0)) {
                    $real_filesize = false;
                    if (self::$EnvironmentIsWindows) {
                        $commandline = 'dir /-C "' . str_replace('/',
                                                                 DIRECTORY_SEPARATOR,
                                                                 $filename) . '"';
                        $dir_output = `$commandline`;
                        if (preg_match('#1 File\(s\)[ ]+([0-9]+) bytes#i',
                                       $dir_output, $matches)) {
                            $real_filesize = (float) $matches[1];
                        }
                    } else {
                        $commandline = 'ls -o -g -G --time-style=long-iso ' . escapeshellarg($filename);
                        $dir_output = `$commandline`;
                        if (preg_match('#([0-9]+) ([0-9]{4}-[0-9]{2}\-[0-9]{2} [0-9]{2}:[0-9]{2}) ' . str_replace('#',
                                                                                                                  '\\#',
                                                                                                                  preg_quote($filename)) . '$#',
                                                                                                                             $dir_output,
                                                                                                                             $matches)) {
                            $real_filesize = (float) $matches[1];
                        }
                    }
                    if ($real_filesize === false) {
                        unset($this->info['filesize']);
                        fclose($this->fp);
                        throw new DefaultException('Unable to determine actual filesize. File is most likely larger than ' . round(PHP_INT_MAX / 1073741824) . 'GB and is not supported by PHP.');
                    } elseif (Helper::intValueSupported($real_filesize)) {
                        unset($this->info['filesize']);
                        fclose($this->fp);
                        throw new DefaultException('PHP seems to think the file is larger than ' . round(PHP_INT_MAX / 1073741824) . 'GB, but filesystem reports it as ' . number_format($real_filesize,
                                                                                                                                                                                        3) . 'GB, please report to info@getid3.org');
                    }
                    $this->info['filesize'] = $real_filesize;
                    $this->error('File is larger than ' . round(PHP_INT_MAX / 1073741824) . 'GB (filesystem reports it as ' . number_format($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

            return true;
        } catch (DefaultException $e) {
            $this->error($e->getMessage());
        }

        return false;
    }

    public function analyze($filename)
    {
        try {
            if (!$this->openfile($filename)) {
                return $this->info;
            }

            // Handle tags
            foreach (array('id3v2' => 'id3v2', 'id3v1' => 'id3v1', 'apetag' => 'ape', 'lyrics3' => 'lyrics3') as $tag_name => $tag_key) {
                $option_tag = 'option_tag_' . $tag_name;
                if ($this->$option_tag) {
                    try {
                        $tag_class = 'GetId3\\Module\\Tag\\' . ucfirst($tag_name);
                        $tag = new $tag_class($this);
                        $tag->analyze();
                    } catch (DefaultException $e) {
                        throw $e;
                    }
                }
            }
            if (isset($this->info['id3v2']['tag_offset_start'])) {
                $this->info['avdataoffset'] = max($this->info['avdataoffset'],
                                                  $this->info['id3v2']['tag_offset_end']);
            }
            foreach (array('id3v1' => 'id3v1', 'apetag' => 'ape', 'lyrics3' => 'lyrics3') as $tag_name => $tag_key) {
                if (isset($this->info[$tag_key]['tag_offset_start'])) {
                    $this->info['avdataend'] = min($this->info['avdataend'],
                                                   $this->info[$tag_key]['tag_offset_start']);
                }
            }

            // ID3v2 detection (NOT parsing), even if ($this->option_tag_id3v2 == false) done to make fileformat easier
            if (!$this->option_tag_id3v2) {
                fseek($this->fp, 0, SEEK_SET);
                $header = fread($this->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});
                    $this->info['avdataoffset'] += Helper::BigEndian2Int(substr($header,
                                                                                   6,
                                                                                   4),
                                                                                   1) + 10; // length of ID3v2 tag in 10-byte header doesn't include 10-byte header length
                }
            }

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

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

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

                    return $this->error('ID3 tags not allowed on this file type.');
                } elseif ($determined_format['fail_id3'] === 'WARNING') {
                    $this->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($this->fp);

                    return $this->error('APE tags not allowed on this file type.');
                } elseif ($determined_format['fail_ape'] === 'WARNING') {
                    $this->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 (!class_exists($determined_format['class'])) {
                fclose($this->fp);

                return $this->error('Format not supported, module "' . $determined_format['include'] . '" was removed.');
            }

            // module requires iconv support
            // Check encoding/iconv support
            if (!empty($determined_format['iconv_req']) && !function_exists('iconv') && !in_array($this->encoding,
                                                                                                  array('ISO-8859-1', 'UTF-8', 'UTF-16LE', 'UTF-16BE', 'UTF-16'))) {
                $errormessage = 'iconv() support is required for this module (' . $determined_format['include'] . ') for encodings other than ISO-8859-1, UTF-8, UTF-16LE, UTF16-BE, UTF-16. ';
                if (self::$EnvironmentIsWindows) {
                    $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);
            }

            // instantiate module class
            $class_name = 'GetId3\\Module\\' . Helper::toCamelCase($determined_format['group'], '-', true) . '\\' . ucfirst($determined_format['module']);
            if (!class_exists($class_name)) {
                return $this->error('Format not supported, module "' . $determined_format['include'] . '" is corrupt.');
            }
            //if (isset($determined_format['option'])) {
            //  //$class = new $class_name($this->fp, $this->info, $determined_format['option']);
            //} else {
            //$class = new $class_name($this->fp, $this->info);
            $class = new $class_name($this);
            //}

            if (!empty($determined_format['set_inline_attachments'])) {
                $class->inline_attachments = $this->option_save_attachments;
            }
            $class->analyze();

            unset($class);

            // close file
            fclose($this->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();
        } catch (\Exception $e) {
            $this->error('Caught exception: ' . $e->getMessage());
        }

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

    private function error($message)
    {
        $this->CleanUp();
        if (!isset($this->info['error'])) {
            $this->info['error'] = array();
        }
        $this->info['error'][] = $message;

        return $this->info;
    }

    private function warning($message)
    {
        $this->info['warning'][] = $message;

        return true;
    }

    private 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']);
            }
        }

        // remove possible duplicated identical entries
        if (!empty($this->info['error'])) {
            $this->info['error'] = array_values(array_unique($this->info['error']));
        }
        if (!empty($this->info['warning'])) {
            $this->info['warning'] = array_values(array_unique($this->info['warning']));
        }

        // remove "global variable" type keys
        unset($this->info['php_memory_limit']);

        return true;
    }

    public 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',
                            'mime_type' => 'application/octet-stream',
                            'fail_ape' => 'WARNING',
                    ),
                    // AA   - audio       - Audible Audiobook
                    'aa' => array(
                            'pattern' => '^.{4}\x57\x90\x75\x36',
                            'group' => 'audio',
                            'module' => 'aa',
                            'mime_type' => 'audio/audible',
                    ),
                    // AAC  - audio       - Advanced Audio Coding (AAC) - ADTS format (very similar to MP3)
                    'adts' => array(
                            'pattern' => '^\xFF[\xF0-\xF1\xF8-\xF9]',
                            'group' => 'audio',
                            'module' => 'aac',
                            '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-\x03]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',
                            'set_inline_attachments' => true,
                    ),
                    // 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-\x0B\x10-\x1B\x20-\x2B\x30-\x3B\x40-\x4B\x50-\x5B\x60-\x6B\x70-\x7B\x80-\x8B\x90-\x9B\xA0-\xAB\xB0-\xBB\xC0-\xCB\xD0-\xDB\xE0-\xEB\xF0-\xFB]',
                            '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
                            'set_inline_attachments' => true,
                    ),
                    // 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',
                            'set_inline_attachments' => true,
                    ),
                    // 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',
                    ),
                    // TS - audio/video - MPEG-2 Transport Stream
                    'ts' => array(
                            'pattern' => '^\x47',
                            'group' => 'audio-video',
                            'module' => 'ts',
                            'mime_type' => 'video/MP2T',
                    ),
                    // 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 |xmlns="http:\/\/www\.w3\.org\/2000\/svg")',
                            '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',
                    ),
                    // EFAX - still image - eFax (TIFF derivative)
                    'efax' => array(
                            'pattern' => '^\xDC\xFE',
                            'group' => 'graphic',
                            'module' => 'efax',
                            'mime_type' => 'image/efax',
                            '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\xA1\xB1\x1A\xE1', // 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;
    }

    public 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
        $GetFileFormatArray = $this->GetFileFormatArray();
        foreach ($GetFileFormatArray as $format_name => $info) {
            // The /s switch on preg_match() forces preg_match() NOT to treat
            // newline (0x0A) characters as special chars but do a binary match
            if (!empty($info['pattern'])
                && preg_match('#' . $info['pattern'] . '#s', $filedata)
            ) {
                $info['class'] = 'GetId3\\Module\\' . Helper::toCamelCase($info['group'], '-', true) . '\\' . ucfirst($info['module']);
                $info['include'] = str_replace('\\', DIRECTORY_SEPARATOR, $info['class']) . '.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
            $info = $GetFileFormatArray['mp3'];
            $info['class'] = 'GetId3\\Module\\' . Helper::toCamelCase($info['group'], '-', true) . '\\' . ucfirst($info['module']);
            $info['include'] = str_replace('\\', DIRECTORY_SEPARATOR, $info['class']) . '.php';

            return $info;
        } elseif (preg_match('/\.cue$/i', $filename) && preg_match('#FILE "[^"]+" (BINARY|MOTOROLA|AIFF|WAVE|MP3)#',
                                                                   $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
            $info = $GetFileFormatArray['cue'];
            $info['class'] = 'GetId3\\Module\\' . Helper::toCamelCase($info['group'], '-', true) . '\\' . ucfirst($info['module']);
            $info['include'] = str_replace('\\', DIRECTORY_SEPARATOR, $info['class']) . '.php';

            return $info;
        }

        return false;
    }

    public 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(Helper::iconv_fallback($encoding,
                                                              $this->encoding,
                                                              $value));
            }
        }
    }

    public 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', 'UTF-8'),
                    '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 GetId3Core() force-converts all encodings to UTF-8
                    'ape' => array('ape', 'UTF-8'),
                    'cue' => array('cue', 'ISO-8859-1'),
                    'matroska' => array('matroska', 'UTF-8'),
                    'flac' => array('vorbiscomment', 'UTF-8'),
            );
        }

        // loop through 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 => $value) {
                        if (is_string($value)) {
                            $value = trim($value, " \r\n\t"); // do not trim nulls from $value!! Unicode characters will get mangled if trailing nulls are removed!
                        }
                        if ($value) {
                            $this->info['tags'][trim($tag_name)][trim($tag_key)][] = $value;
                        }
                    }
                    if ($tag_key == 'picture') {
                        unset($this->info[$comment_name]['comments'][$tag_key]);
                    }
                }

                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;',
                                                                                                  '',
                                                                                                  trim(Helper::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!
            }
        }

        // pictures can take up a lot of space, and we don't need multiple copies of them
        // let there be a single copy in [comments][picture], and not elsewhere
        if (!empty($this->info['tags'])) {
            $unset_keys = array('tags', 'tags_html');
            foreach ($this->info['tags'] as $tagtype => $tagarray) {
                foreach ($tagarray as $tagname => $tagdata) {
                    if ($tagname == 'picture') {
                        foreach ($tagdata as $key => $tagarray) {
                            $this->info['comments']['picture'][] = $tagarray;
                            if (isset($tagarray['data']) && isset($tagarray['image_mime'])) {
                                if (isset($this->info['tags'][$tagtype][$tagname][$key])) {
                                    unset($this->info['tags'][$tagtype][$tagname][$key]);
                                }
                                if (isset($this->info['tags_html'][$tagtype][$tagname][$key])) {
                                    unset($this->info['tags_html'][$tagtype][$tagname][$key]);
                                }
                            }
                        }
                    }
                }
                foreach ($unset_keys as $unset_key) {
                    // remove possible empty keys from (e.g. [tags][id3v2][picture])
                    if (empty($this->info[$unset_key][$tagtype]['picture'])) {
                        unset($this->info[$unset_key][$tagtype]['picture']);
                    }
                    if (empty($this->info[$unset_key][$tagtype])) {
                        unset($this->info[$unset_key][$tagtype]);
                    }
                    if (empty($this->info[$unset_key])) {
                        unset($this->info[$unset_key]);
                    }
                }
                // remove duplicate copy of picture data from (e.g. [id3v2][comments][picture])
                if (isset($this->info[$tagtype]['comments']['picture'])) {
                    unset($this->info[$tagtype]['comments']['picture']);
                }
                if (empty($this->info[$tagtype]['comments'])) {
                    unset($this->info[$tagtype]['comments']);
                }
                if (empty($this->info[$tagtype])) {
                    unset($this->info[$tagtype]);
                }
            }
        }

        return true;
    }

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

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

        if (!empty($this->info['fileformat']) && !empty($this->info['dataformat']) && ($this->info['fileformat'] == 'ogg') && ($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 GetId3Core() 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 GetId3Core() 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 (preg_match('#(1|ON)#i', ini_get('safe_mode'))) {

                $this->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
                $empty = tempnam(self::getTempDir(), 'getID3');
                touch($empty);

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

                if (self::$EnvironmentIsWindows) {

                    if (file_exists(self::getHelperAppsDir() . 'vorbiscomment.exe')) {

                        $commandline = '"' . self::getHelperAppsDir() . 'vorbiscomment.exe" -w -c "' . $empty . '" "' . $file . '" "' . $temp . '"';
                        $VorbisCommentError = `$commandline`;
                    } else {

                        $VorbisCommentError = 'vorbiscomment.exe not found in ' . self::getHelperAppsDir();
                    }
                } 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 GetId3Core() directory. Error returned: ' . $VorbisCommentError;
                    $this->info[$algorithm . '_data'] = false;
                } else {

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

                        case 'sha1':
                            $this->info[$algorithm . '_data'] = 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'] = Helper::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'] = md5_file($this->info['filenamepath']);
                        break;

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

        return true;
    }

    public function ChannelsBitratePlaytimeCalculations()
    {

        // set channelmode on audio
        if (!empty($this->info['audio']['channelmode']) || !isset($this->info['audio']['channels'])) {
            // ignore
        } elseif ($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'])) {
            $this->info['playtime_string'] = Helper::PlaytimeString($this->info['playtime_seconds']);
        }
    }

    public 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;
    }

    public 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;
    }

    public function CalculateReplayGain()
    {
        if (isset($this->info['replay_gain'])) {
            if (!isset($this->info['replay_gain']['reference_volume'])) {
                $this->info['replay_gain']['reference_volume'] = (double) 89.0;
            }
            if (isset($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'])) {
                $this->info['replay_gain']['track']['max_noclip_gain'] = 0 - Helper::RGADamplitude2dB($this->info['replay_gain']['track']['peak']);
            }
            if (isset($this->info['replay_gain']['album']['peak'])) {
                $this->info['replay_gain']['album']['max_noclip_gain'] = 0 - Helper::RGADamplitude2dB($this->info['replay_gain']['album']['peak']);
            }
        }

        return true;
    }

    public 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;
    }

    public function GetId3_tempnam()
    {
        return tempnam($this->tempdir, 'gI3');
    }

    public static function getTempDir()
    {
        if (null === self::$TempDir) {
            $temp_dir = ini_get('upload_tmp_dir');
            if ($temp_dir && (!is_dir($temp_dir) || !is_readable($temp_dir))) {
                $temp_dir = '';
            }
            if (!$temp_dir && function_exists('sys_get_temp_dir')) {
                // PHP v5.2.1+
                // sys_get_temp_dir() may give inaccessible temp dir, e.g. with open_basedir on virtual hosts
                $temp_dir = sys_get_temp_dir();
            }
            $temp_dir = realpath($temp_dir);
            $open_basedir = ini_get('open_basedir');

            if ($open_basedir) {
                // e.g. "/var/www/vhosts/getid3.org/httpdocs/:/tmp/"
                $temp_dir = str_replace(array('/', '\\'), DIRECTORY_SEPARATOR,
                                        $temp_dir);
                $open_basedir = str_replace(array('/', '\\'),
                                            DIRECTORY_SEPARATOR, $open_basedir);
                if (substr($temp_dir, -1, 1) != DIRECTORY_SEPARATOR) {
                    $temp_dir .= DIRECTORY_SEPARATOR;
                }
                $found_valid_tempdir = false;
                $open_basedirs = explode(':', $open_basedir);
                foreach ($open_basedirs as $basedir) {
                    if (substr($basedir, -1, 1) != DIRECTORY_SEPARATOR) {
                        $basedir .= DIRECTORY_SEPARATOR;
                    }
                    if (preg_match('#^' . preg_quote($basedir) . '#', $temp_dir)) {
                        $found_valid_tempdir = true;
                        break;
                    }
                }
                if (!$found_valid_tempdir) {
                    $temp_dir = '';
                }
                unset($open_basedirs, $found_valid_tempdir, $basedir);
            }
            if (!$temp_dir) {
                $temp_dir = '*'; // invalid directory name should force tempnam() to use system default temp dir
            }
            self::$TempDir = $temp_dir;
            unset($open_basedir, $temp_dir);
        }

        return self::$TempDir;
    }

    public static function environmentIsWindows()
    {
        // define a static property rather than looking up every time it is needed
        if (null === self::$EnvironmentIsWindows) {
            self::$EnvironmentIsWindows = strtolower(substr(PHP_OS, 0, 3)) == 'win';
        }

        return self::$EnvironmentIsWindows;
    }

    public static function getIncludePath()
    {
        // Get base path of GetId3Core() - ONCE
        if (null === self::$IncludePath) {
            foreach (get_included_files() as $val) {
                if (basename($val) == 'getid3.php') {
                    self::$IncludePath = dirname($val) . DIRECTORY_SEPARATOR;
                    break;
                }
            }
        }

        return self::$IncludePath;
    }
}