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

Movie AtomsReference MoviesData reference atomEach reference movie atom must contain exactly one data reference atom. See “Data ReferenceAtoms” (page 94) for more information.Data rate atomA reference movie atom may contain an optional data rate atom. Only one data rate atom can be present.See “Data Rate Atom” (page 123) for more information.CPU speed atomA reference movie atom may contain an optional CPU speed atom. Only one CPU speed atom can bepresent. See “CPU Speed Atom” (page 124) for more information.Version check atomA reference movie atom may contain an optional version check atom. Multiple version check atoms canbe present. See “Version Check Atom” (page 124) for more information.Component detect atomA reference movie atom may contain an optional component detect atom. Multiple component detectatoms can be present. See “Component Detect Atom” (page 125) for more information.Quality atomA reference movie atom may contain an optional quality atom. Only one quality atom can be present.See “Quality Atom” (page 127) for more information.Data Reference AtomA data reference atom contains the information necessary to locate a movie, or a stream or file that QuickTimecan play, typically in the form of a URL or a file alias.Only one data reference atom is allowed in a given movie reference descriptor atom.A data reference atom may contain the following fields:SizeThe number of bytes in this data reference atom.TypeThe type of this atom; this field must be set to 'rdrf'.FlagsA 32-bit integer containing flags. One flag is currently defined.Movie is self-containedIf the least-significant bit is set to 1, the movie is self-contained. This requires that the parentmovie contain a movie header atom as well as a reference movie atom. In other words, the current2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.122