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

MetadataLocation MetadataLocation MetadataMany systems have the ability to detect or establish their position in a coordinate reference system. Thespecification “ISO 6709:2008 Standard representation of geographic point location by coordinates” describesone way of storing such information. One of the common systems is the Global Positioning System (GPS)developed by the US Department of Defense. Other systems include the ability of some cellular telephonesystems to triangulate the position of cell-phones, and the possibility that IEEE 802.11 Wireless Base Stationsare tagged with their position (whereupon mobile units that can ‘see’ their signal can establish that they areprobably ‘near’ that location).This support is increasingly common in still and movie cameras, or composite devices (such as camera-phones)that can function as cameras.Apple has defined a key for storing the location coordinates as metadata, as well as several auxiliary pieces ofinformation about a location. For all the location metadata keys defined in this specification, the Metadataatom handler-type should be ‘mdta’. See the com.apple.quicktime.location.ISO6709 entry in the followingtable for a description of the main location metadata key, and the additional table describing auxiliary locationmetadata keys.QuickTime Metadata KeysQuickTime has defined the keys shown in Table 3-6 (page 144) for holding data in a Metadata atom:Table 3-6Metadata keysKeyKeyTypeValue PayloadDefinitionExamplecom.apple.quicktime.album'mdta’A UTF-8 string(value type 1).Can havemultiplevalues withdifferentlanguage andcountry codedesignations.Album orcollectionname ofwhich themoviecontentforms a part.Technical documentsperformed to blues tunesVolume 1.2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.144