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

Media Data Atom TypesWired Action Grammar[UInt16 modifierKeys]kActionParameter, 2, 2[UInt8 asciiCharCode]OR 1, 1kActionParameter, 1, 1[short minimum]kActionParameter, 2, 2[short maximum]OR[(ActionTargetAtoms)]The format for parameter data depends on the action and parameter index.In most cases, the kActionParameter atom is a leaf atom containing data; for a few parameters, it containschild atoms.whichAction corresponds to the action type that is specified by the leaf data of a kWhichAction atom.paramIndex is the index of the parameter’s kActionParameter atom.[(parameterData)] ( whichAction, paramIndex ) ={kActionMovieSetVolume:param1:short volumekActionMovieSetRateparam1:Fixed ratekActionMovieSetLoopingFlagsparam1:long loopingFlagskActionMovieGoToTimeparam1:TimeValue time2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.228