Quicktime File Format (2012-08-14).pdf

MetadataData Atom StructureNameAn array of bytes, constituting a UTF-8 string, containing the name.Data Atom StructureThe Data atom has an atom type of ‘data’, and contains four bytes each of type and locale indicators, as specifiedin “Type Indicator” (page 139) and “Locale Indicator” (page 139), and then the actual value of the metadata,formatted as required by the type.This atom has the following structure:Type IndicatorThe type indicator, as defined in “Type Indicator” (page 139).Locale IndicatorThe locale indicator, as defined in “Locale Indicator” (page 139).ValueAn array of bytes containing the value of the metadata.Data OrderingMultiple values for the same tag represent multiple representations of the same information, differing eitherby language or storage type or by the size or nature of the data. For example, an artist name may be suppliedin three ways:●●●as a large JPEG of their signatureas a smaller ‘thumbnail’ JPEG of their signatureas textAn application may then choose the variation of the the artist name to display based on the size it needs.Data must be ordered in each item from the most-specific data to the most general. An application may, if itwishes, stop ‘searching’ for a value once it finds a value that it can display (it has an acceptable locale andtype).2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.142