Inside Macintosh: QuickTime Components /

Chapter 11 - Clock Components / Clock Components Reference

Movie Toolbox Clock Support Functions

The Movie Toolbox provides a number of support functions for clock components. All of these functions help your component manage its associated callback functions. Your clock component may call any of these functions at interrupt time. These functions should only be called by clock components.

Use the AddCallBackToTimeBase function to add a callback event to the list of scheduled callback events maintained by the Movie Toolbox. You should use the RemoveCallBackFromTimeBase function to remove a callback event from the list.

When your clock component determines that it is time to invoke a callback function, you should use the ExecuteCallBack function to cause the Movie Toolbox to call the function.

If your clock component needs to scan all its associated callback events, you can use the GetFirstCallBack and GetNextCallBack functions.