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

Media Data Atom Types3D MediaThe movie controller automatically recognizes a chapter list and will create a pop-up list from it. When theuser makes a selection from the pop-up, the controller will jump to the appropriate point in the movie. Notethat if the movie is sized so that the controller is too narrow to display the chapter names, the pop-up list willnot appear.To create a chapter list, you must create a text track with one sample for each chapter. The display time foreach sample corresponds to the point in the movie that marks the beginning of that chapter. You must alsocreate a track reference of type 'chap' from an enabled track of the movie to the text track. It is the 'chap'track reference that makes the text track into a chapter list. The track containing the reference can be of anytype (audio, video, MPEG, and so on), but it must be enabled for the chapter list to be recognized.Given an enabled track myVideoTrack, for example, you can use the AddTrackReference function to createthe chapter reference:AddTrackReference( myVideoTrack, theTextTrack,kTrackReferenceChapterList,&addedIndex );kTrackReferenceChapterList is defined in Movies.h. It has the value 'chap'.The text track that constitutes the chapter list does not need to be enabled, and normally is not. If it is enabled,the text track will be displayed as part of the movie, just like any other text track, in addition to functioning asa chapter list.If more than one enabled track includes a 'chap' track reference, QuickTime uses the first chapter list that itfinds.3D MediaNote 3D Media is deprecated in the QuickTime file format. The information that follows is intendedto document existing content containing 3D media and should not be used for new development.QuickTime movies store 3D image data in a base media. This media has a media type of 'qd3d'.3D Sample DescriptionThe 3D sample description uses the standard sample description header, as described in “Sample TableAtoms” (page 96).2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.249