QuickTime 4 Reference

Tween Container Syntax

Tween containers conform to the following syntax:

[(TweenContainerFormat)] = [(SingleTweenFormat)] | [(SequencedTweenFormat)] [(SingleTweenFormat)] = [(TweenEntryAtoms)] <kTweenEntry>, (anyUniqueIDs), (1..numInterpolators) [(TweenEntryAtoms)] [(SequencedTweenFormat)] = kTweenSequenceElement, (anyUniqueIDs), (1..numSequenceElements) [TweenSequenceEntryRecord] = {endPercent, tweenAtomID, dataAtomID} kTweenEntry, (anyUniqueIDs), (1..numSequenceElements + numInterpolators) [(TweenEntryAtoms)] [(TweenEntryAtoms)] = kTweenType, 1, 1 [OSType] = the type of tween <kTweenStartOffset>, 1, 1 [TimeValue] = starting offset <kTweenDuration>, 1, 1 [TimeValue] = duration <kTweenOutputMinValue>, 1, 1 [Fixed] = minimum output value <kTweenOutputMaxValue>, 1, 1 [Fixed] = maximum output value <kTweenFlags>, 1, 1 [long] = flags kTweenData, (anyUniqueIDs), (1..numDataAtoms) // contents dependent on kTweenType, could be leaf data or nested atoms <kTweenInterpolationID>, (a kTweenData ID), (1.. numInterpolationIDAtoms) [QTAtomID] = the id of a kTweenEntry (child of [(TweenContainerFormat)] describing the tween to be used to interpolate time values.

Important
QTAtomContainer -based data structures are being widely used in QuickTime. For more information about this syntax and these data structures, see Appendix D . This appendix provides you with a standardized format that describes how these data structures may be expressed and how they are currently documented.