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

Movie AtomsSample AtomsFlagsA 3-byte space for data reference flags. There is one defined flag.Self referenceThis flag indicates that the media’s data is in the same file as the movie atom. On the Macintosh,and other file systems with multi-fork files, set this flag to 1 even if the data resides in a differentfork from the movie atom. This flag’s value is 0x0001.DataThe data reference information.Table 2-4 (page 95) shows the currently defined data reference types that can be stored in a header atom.Table 2-4Data reference typesData referencetype'alis''rsrc''url 'DescriptionData reference is a Macintosh alias. An alias contains information about the file itrefers to, including its full path name.Data reference is a Macintosh alias. Appended to the end of the alias is the resourcetype (stored as a 32-bit integer) and ID (stored as a 16-bit signed integer) to usewithin the specified file. This data reference type is deprecated in the QuickTimefile format. This information is intended to document existing content containing'rsrc’ data references and should not be used for new development.A C string that specifies a URL. There may be additional data after the C string.Sample AtomsQuickTime stores media data in samples. A sample is a single element in a sequence of time-ordered data.Samples are stored in the media, and they may have varying durations.2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.95