Inside Macintosh: QuickTime Reference
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In QuickTime 3.5 and beyond, software developers using a plug-in mechanism may supplement the set of built-in wired actions. Custom Action Handler Components may be written to perform new types of actions.
For example, a math library component could be written to perform complicated computations quickly, returning the result by setting a sprite track variable. Another use would be for allowing a custom media handler to be scripted using wired actions.
Custom wired actions in a movie are routed to these components for handling. They are passed information about the current QTEvent, the movie element that is to be the target of the action, the default movie element that received the QTEvent and generated the action, the type of the action, and the parameters of the action. The wired action expression evaluation machinery has been exposed as a single API call, allowing general wired expressions to be passed as parameters.
Inside Macintosh: QuickTime Reference
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