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

MetadataWell-Known TypesWell-Known TypesThe basic data-type list is in Table 3-5 (page 143).Table 3-5Code0123451314212223242728Well-known data typesTypereservedUTF-8UTF-16S/JISUTF-8 sortUTF-16 sortJPEGPNGBE Signed IntegerBE Unsigned IntegerBE Float32BE Float64BMPQuickTime Metadata atomCommentReserved for use where no type needs to be indicatedWithout any count or NULL terminatorAlso known as UTF-16BEDeprecated unless it is needed for special Japanese charactersVariant storage of a string for sorting onlyVariant storage of a string for sorting onlyIn a JFIF wrapperIn a PNG wrapperA big-endian signed integer in 1,2,3 or 4 bytesA big-endian unsigned integer in 1,2,3 or 4 bytes; size of valuedetermines integer sizeA big-endian 32-bit floating point value (IEEE754)A big-endian 64-bit floating point value (IEEE754)Windows bitmap format graphicsA block of data having the structure of the Metadata atomdefined in this specificationThe sorting variant of text is used for languages in which sorting is not evident from the written form (forexample, some forms of Asian languages). In these cases, the sorting can only be performed by a human whocan identify the actual words by understanding the context. For these languages, an alternative form of thesame information can be stored using a different representation of the same text which can be machine sorted.This alternative representation is still sorted according to the sort rules of the language in question, as definedfor the text system in use (for example, Unicode). In general, a simple lexical sorting which compares the valuesof the characters alone is not sufficient.2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.143