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

Media Data Atom TypesTween MediakTweenTypeSpecifies the tween type (the data type of the data for the tween operation).Its parent atom is a kTweenEntry atom.A kTweenEntry atom can contain only one kTweenType atom. The ID of this atom is always 1. Theindex of this atom is always 1.This atom is a leaf atom. The data type of its data is OSType.This atom is required.Path Tween AtomskTweenFlagsContains flags that control the tween operation. One flag that controls path tween atoms is defined:●The kTweenReturnDelta flag applies only to path tween atoms (tweens of typekTweenTypePathToFixedPoint, kTweenTypePathToMatrixTranslation,kTweenTypePathToMatrixTranslationAndRotation, kTweenTypePathXtoY, orkTweenTypePathYtoX). If the flag is set, the tween component returns the change in value fromthe last time it was invoked. If the flag is not set, or if the tween component has not previously beeninvoked, the tween component returns the normal result for the tween atom.Its parent atom is a kTweenEntry atom.A kTweenEntry atom can contain only one kTweenFlags 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 Long.This atom is optional. If it is not included, no flags are set.kInitialRotationAtomSpecifies an initial angle of rotation for a path tween atom of type kTweenTypePathToMatrixRotation,kTweenTypePathToMatrixTranslation, or kTweenTypePathToMatrixTranslationAndRotation.Its parent atom is a kTweenEntry atom.A kTweenEntry atom can contain only one kInitialRotationAtom atom. The ID of this atom isalways 1. The index of this atom is always 1.This atom is a leaf atom. Its data type is Fixed.This atom is optional. If it is not included, no initial rotation of the tween atom is performed.2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.242