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TimeBase Control Plugin for REALbasic Version 1.0, August 12, 2002 --Initial release Working With Time Bases The Movie Toolbox provides a number of functions that allow you to work with time bases. A QuickTime time base defines the time coordinate system of a movie. However, you can also use QuickTime time bases to provide general timing services. Although most time base functions can be used at interrupt time, several of the Movie Toolbox functions cannot. Creating Time Bases NewTimeBase lets you create a new time base. Time bases rely on either a clock component or another time base for their time source. You can use SetTimeBaseMasterTimeBase to cause one time base to be based on another time base. GetTimeBaseMasterTimeBase allows you to determine the master time base of a given time base. You can assign a clock component to a time base; that clock then acts as the master clock for the time base. You can use SetTimeBaseMasterClock to assign a clock component to a time base. GetTimeBaseMasterClock enables you to determine the clock component that is assigned to a time base. You can change the offset between a time base and its time source by calling SetTimeBaseZero. You can set the time source of a movie by calling SetMovieMasterTimeBase or SetMovieMasterClock. Working With Time Base Values Every time base contains a rate, a start time, a stop time, a current time, and some status information. The Movie Toolbox provides a number of functions that allow your application to work with the contents of a time base. You can use time structures to represent either time values or durations. Time values specify a point in time, relative to a given time base. Durations specify a span of time, relative to a given time scale. Durations are represented by time structures that have the time base set to 0 (that is, the base field in the time structure is set to NIL). GetTimeBaseTime lets you retrieve the current time value of a time base. You can set the current time value by calling SetTimeBaseTime; this function requires you to provide a time structure. Alternatively, you can set the current time based on a time value by calling SetTimeBaseValue. You can determine the rate of a time base by calling GetTimeBaseRate. You can set the rate of a time base by calling SetTimeBaseRate. You can determine the effective rate of a specified time base (relative to the master time base to which it is subordinate) by calling GetTimeBaseEffectiveRate. You can retrieve the start time of a time base by calling GetTimeBaseStartTime. You can set the start time of a time base by calling SetTimeBaseStartTime. Similarly, you can use GetTimeBaseStopTime and SetTimeBaseStopTime to work with the stop time of a time base. The Movie Toolbox provides functions that allow you to work with the status information of a time base. GetTimeBaseStatus allows you to read the current status of a time base. GetTimeBaseFlags helps you obtain the control flags of a time base. You can set these flags by calling SetTimeBaseFlags. Hope you can use it for your benefit(s), the plugin comes with a little sample project. Alfred N. Van Hoek, Ph.D. <http://homepage.mac.com/vanhoek/> __________________________ Please visit our sponsors: RadGad(sm): The Place for Useful Gifts & Gadgets.(sm) http://www.radgad.com/, mailto:[EMAIL PROTECTED], or 877-5-RADGAD MacTech(r) Magazine: The journal of Macintosh technology and development http://www.mactech.com, mailto:[EMAIL PROTECTED], or 805-494-9797 DevDepot(sm): Your Source for RAM, Technical & Developer Products http://www.devdepot.com, mailto:[EMAIL PROTECTED] or call 877-DEPOT-NOW To submit a posting to MacDev-1, mailto:[EMAIL PROTECTED]. To subscribe to MacDev-1, send mail to [EMAIL PROTECTED] with the SUBJECT line reading "SUBSCRIBE MACDEV-1". To unsubscribe, the SUBJECT line should read "UNSUBSCRIBE MACDEV-1". MacTech, Developer Depot, RadGad, and Xplain Corporation are not responsible for any errors, omissions, or other inaccuracies in this message. News may be propagated freely, but please attribute your source as MacTech Magazine, <http://www.mactech.com>. --
