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

MetadataMetadata Item AtomFigure 3-4 (page 138) shows the connection between keys.Figure 3-4The metadata item list atom and the item/key ConnectionMetadata item list atom (type = 'ilst')key_index 2Datathe_type the_locale value[ ]key_index 4Datathe_type the_locale value[ ]key_index 1Datathe_type the_locale value[ ]itifnameitifnameitifnameKeysentry_count = 4key 1key 2key 3key 4RequiredOptionalMetadata Item AtomEach item in the metadata item list atom is identified by its key. The atom type for each metadata item atomshould be set equal to the index of the key for the metadata within the item atom, taking this index from themetadata item keys atom. In addition, each metadata item atom contains a “Value Atom” (page 139), to holdthe value of the metadata item.The metadata item atom has the following structure:Item_infoAn optional item information atom, see “Item Information Atom (ID and flags)” (page 141)NameAn optional name atom, defined below.Data value atom[]An array of value atoms, defined below.2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.138