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

Media Data Atom TypesTween Mediabetween the maximum and minimum values before scaling) is scaled to 1.75 (three-quarters of the waybetween the values of the kTweenOutputMin and kTweenOutputMax atoms).If a kTweenOutputMin atom is included but a kTweenOutputMax atom is not, QuickTime does not scaleinterpolation tween values.Its parent atom is a kTweenEntry atom.A kTweenEntry atom can contain only one kTweenOutputMin atom. The ID of this atom is always 1.The index of this atom is always 1.This atom is a leaf atom. The data type of its data is Fixed.This atom is optional. If it is not included but a kTweenOutputMax atom is, the tween component uses0 as the minimum value for scaling values of an interpolation tween atom.kTweenInterpolationIDSpecifies an interpolation tween atom to use for a specified kTweenData atom. There can be any numberof kTweenInterpolationID atoms for a tween atom, one for each kTweenData atom to be interpolated.Its parent atom is a kTweenEntry atom.The index of a kTweenInterpolationID atom specifies when it was added to the kTweenEntry atom;the first added has the index 1, the second 2, and so on. The ID of a kTweenInterpolationID atommust match the atom ID of the kTweenData atom to be interpolated, and be unique among thekTweenInterpolationID atoms contained in the same kTweenEntry atom.This atom is a leaf atom. The data type of its data is QTAtomID.This atom is required for an interpolation tween atom.Region Tween AtomskTweenPictureDataContains the data for a QuickDraw picture. Used only by a kTweenTypeQDRegion atom.Its parent atom is a kTweenEntry atom.A kTweenEntry atom can contain only one kTweenPictureData or kTweenRegionData atom. TheID of this atom is always 1. The index of this atom is always 1.This atom is a leaf atom. The data type of its data is Picture.Either a kTweenPictureData or kTweenRegionData atom is required for a kTweenTypeQDRegionatom.2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.245