Wired Movies and Sprites

New Grammar for Specifying String Parameters to Actions and Operands

QuickTime 3 supported only leaf data constants for string parameters. In QuickTime 4, you can specify string parameters using leaf data constants, a numeric expression, or a sprite track variable.

Expressions are converted to strings, as are sprite track variable s if they contain a floating-point number instead of a string. Note that although string variables are stored as C strings, they will be automatically converted to Pascal strings as needed.

This applies to the following action and operand parameters:



 
    C String Parameters

        kActionGoToURL, 1

        kActionStatusString, 1

        kActionAddChannelSubscription, 2    

        kActionAddChannelSubscription, 3

        kActionRemoveChannelSubscription, 1

        kOperandSubscribedToChannel, 1

        

    Pascal String Parameters

        kActionMovieGoToTimeByName, 1

        kActionMovieSetSelectionByName, 1

        kActionMovieSetSelectionByName, 2

        kActionPushCurrentTimeWithLabel, 1

        kActionPopAndGotoLabeledTime, 1

        kActionDebugStr, 1

        kActionAddChannelSubscription, 1





    Extended Grammar:

        [(C String Parameter)] = 

                [CString]

            OR

                [(ExpressionAtoms)]

            OR

                [(SpriteTrackVariableOperandAtoms)]

                

        [(Pascal String Parameter)] = 

                [Pascal String]

            OR

                [(ExpressionAtoms)]

            OR

                [(SpriteTrackVariableOperandAtoms)]

                

        

        [(SpriteTrackVariableOperandAtoms)] =

            <kOperandSpriteTrackVariable>, 1, 1

                [(ActionTargetAtoms)]

                kActionParameter, 1, 1

                    [(spriteVariableID)]

                    OR

                    [(ExpressionAtoms)]