File Type Box is placed as early as possible in the file (e.g. * after any obligatory signature, but before any significant variable-size * boxes such as a {@link ISO14496_Box_MOOV Movie Box}, {@link ISO14496_Box_MDAT * Media Data Box}, or {@link ISO14496_Box_FREE Free Space}). It identifies * which specification is the best use of the file, and a minor version * of that specification; and also a set of others specifications to which the * file complies. * * The minor version is informative only. It does not appear for * compatible-brands, and must not be used to determine the conformance of a * file to a standard. It may allow more precise identification of the major * specification, for inspection, debugging, or improved decoding. * * The type isom (ISO Base Media file) is defined as identifying files * that conform to the first version of the ISO Base Media File Format. More * specific identifiers can be used to identify precise versions of * specifications providing more detail. This brand is not be used as the major * brand; this base file format should be derived into another specification to * be used. There is therefore no defined normal file extension, or mime type * assigned to this brand, nor definition of the minor version when isom * is the major brand. * * Files would normally be externally identified (e.g. with a file extension or * mime type) that identifies the best use (major brand), or the brand * that the author believes will provide the greatest compatibility. * * The brand iso2 shall be used to indicate compatibility with the * amended version of the ISO Base Media File Format; it may be used in addition * to or instead of the isom brand and the same usage rules apply. If * used without the brand isom identifying the first version of the * specification, it indicates that support for some or all of the technology * introduced by the amended version of the ISO Base Media File Format is * required. * * The brand avc1 shall be used to indicate that the file is conformant * with the AVC Extensions. If used without other brands, this implies * that support for those extensions is required. The use of avc1 as a * major-brand may be permitted by specifications; in that case, that * specification defines the file extension and required behavior. * * If a Meta-box with an MPEG-7 handler type is used at the file level, then the * brand mp71 is a member of the compatible-brands list in the file-type * box. * * @package php-reader * @subpackage ISO 14496 * @author Sven Vollbehr * @copyright Copyright (c) 2008 The PHP Reader Project Workgroup * @license http://code.google.com/p/php-reader/wiki/License New BSD License * @version $Rev: 92 $ */ final class ISO14496_Box_FTYP extends ISO14496_Box { /** @var integer */ private $_majorBrand; /** @var integer */ private $_minorVersion; /** @var integer */ private $_compatibleBrands = array(); /** * Constructs the class with given parameters and reads box related data from * the ISO Base Media file. * * @param Reader $reader The reader object. */ public function __construct($reader, &$options = array()) { parent::__construct($reader, $options); $this->_majorBrand = $this->_reader->readString8(4); $this->_minorVersion = $this->_reader->readUInt32BE(); while ($this->_reader->getOffset() < $this->getSize()) if (($brand = $this->_reader->readString8(4)) != "") $this->_compatibleBrands[] = $brand; } /** * Returns the major version brand. * * @return string */ public function getMajorBrand() { return $this->_majorBrand; } /** * Returns the minor version number. * * @return integer */ public function getMinorVersion() { return $this->_minorVersion; } /** * Returns the array of compatible version brands. * * @return Array */ public function getCompatibleBrands() { return $this->_compatibleBrands; } }