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

Media Data Atom TypesPanorama Tracks in Cubic NodesImage Tracks in Cubic NodesFor a cubic node the image track contains six samples that correspond to the six square faces of the cube. Thesame applies to hot spot and preview tracks. Figure 4-28 (page 297) shows how the order of samples in thetrack corresponds to the orientation of the cube faces.Figure 4-28Cubic node sample order versus cube face orientationTrack samples1 2 3 4 5 6Cube faces51 2 3 46Note that the frames are oriented horizontally. There is no provision for frames that are rotated 90counterclockwise as there are for cylindrical panoramas.Panorama Tracks in Cubic NodesNote VR Media is deprecated in the QuickTime file format. The information that follows is intendedto document existing content containing VR Media and should not be used for new development.The media sample for a panorama track contains the pano sample atom container. For cubes, some of thefields in the pano sample data atom have special values, which provide compatibility back to QuickTime VR2.2. The cubic projection engine ignores these fields. They allow one to view cubic movies in older versions ofQuickTime VR using the cylindrical engine, although the view will be somewhat incorrect, and the top andbottom faces will not be visible. The special values are shown in Table 4-26 (page 298).2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.297