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

Movie AtomsTrack AtomsTrack Input Map AtomsTrack input map atoms define how data being sent to this track from its nonprimary sources is to be interpreted.Track references of type 'ssrc' define a track’s secondary data sources. These sources provide additionaldata that is to be used when processing the track. Track input map atoms have an atom type value of 'imap'.Figure 2-19 (page 76) shows the layout of a track input atom. This atom contains one or more track inputatoms. Note that the track input map atom is a QT atom structure.Figure 2-19The layout of a track input map atomTrack input map atomAtom sizeType = 'imap'Bytes44Track input atomAtom sizeType = ' in'Atom IDReservedChild countReserved444224Input type atom ‡Atom sizeType = ' ty'Input type444Object ID atomAtom sizeType = 'obid'Object ID444‡ Required atomEach track input map atom contains the following data elements.2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.76