Atom.class.php

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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
 
class Atom
{
    private $_is64   = false;
    
    private $_type   = '';
    
    private $_size   = 0;
    
    private $_offset = 0;
    
    const FTYP_ATOM          = 'ftyp';
    const MOOV_ATOM          = 'moov';
    const CMOV_ATOM          = 'cmov';
    const STCO_ATOM          = 'stco';
    const CO64_ATOM          = 'co64';
    const URL_ATOM           = 'url ';
    const XML_ATOM           = 'xml ';
    
    protected static $validAtoms = array(
        self::FTYP_ATOM,
        self::MOOV_ATOM,
        self::CMOV_ATOM,
        self::STCO_ATOM,
        self::CO64_ATOM,
        self::URL_ATOM,
        self::XML_ATOM,
        'pdin',
        'mvhd',
        'trak',
        'tkhd',
        'tref',
        'edts',
        'elst',
        'mdia',
        'mdhd',
        'hdlr',
        'minf',
        'vmhd',
        'smhd',
        'hmhd',
        'nmhd',
        'dinf',
        'dref',
        'stbl',
        'stsd',
        'stts',
        'ctts',
        'stsc',
        'stsz',
        'stz2',
        'stss',
        'stsh',
        'padb',
        'stdp',
        'sdtp',
        'sbgp',
        'sgpd',
        'subs',
        'mvex',
        'mehd',
        'trex',
        'ipmc',
        'moof',
        'mfhd',
        'traf',
        'tfhd',
        'trun',
        'mfra',
        'tfra',
        'mfro',
        'mdat',
        'free',
        'skip',
        'udta',
        'cprt',
        'meta',
        'dinf',
        'ipmc',
        'iloc',
        'ipro',
        'sinf',
        'frma',
        'imif',
        'schm',
        'schi',
        'iinf',
        'bxml',
        'pitm'
    );
 
 
    public static function isValidAtom($fourByteString)
    {
        if (preg_match('/[@a-zA-Z][a-zA-Z0-9][a-zA-Z0-9 ][a-zA-Z0-9 ]/', $fourByteString) && 
            in_array($fourByteString, self::$validAtoms)) {
            return true;
        } else {
            return false;
        }
    }
 
 
    public function getType()
    {
        return $this->_type;
    }
    
    public function setType($type)
    {
        $this->_type = $type;
    }
 
    
    public function getSize()
    {
        return $this->_size;
    }
    
    public function setSize($value)
    {
        $this->_size = $value;
        if ($value == 1) {
            $this->_is64 = true; 
        }
    }
 
 
    public function getOffset()
    {
        return $this->_offset;
    }
    
    public function setOffset($value)
    {
        $this->_offset = $value;
    }
 
 
    public function toString()
    {
        return '[type: ' . $this->_type . ',size: ' . $this->_size . ',offset: ' . $this->_offset . ']';
    }   
}
 
?>