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<div class="left_inner_box_heading"><h1>TimeBase Control Plugin for REALbasic</h1></div>
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<p>TimeBase Control Plugin for REALbasic</p>
<p>Version 1.0, August 12, 2002<br />
--Initial release</p>
<p>Working With Time Bases<br />
The Movie Toolbox provides a number of functions that allow you to work<br />
with time bases. A QuickTime time base defines the time coordinate system<br />
of a movie. However, you can also use QuickTime time bases to provide<br />
general timing services.</p>
<p>Although most time base functions can be used at interrupt time, several of<br />
the Movie Toolbox functions cannot.</p>
<p>Creating Time Bases<br />
NewTimeBase lets you create a new time base. Time bases rely on either a<br />
clock component or another time base for their time source. You can use<br />
SetTimeBaseMasterTimeBase to cause one time base to be based on another<br />
time base. GetTimeBaseMasterTimeBase allows you to determine the master<br />
time base of a given time base. You can assign a clock component to a time<br />
base; that clock then acts as the master clock for the time base. You can<br />
use SetTimeBaseMasterClock to assign a clock component to a time base.<br />
GetTimeBaseMasterClock enables you to determine the clock component that is<br />
assigned to a time base. You can change the offset between a time base and<br />
its time source by calling SetTimeBaseZero. You can set the time source of<br />
a movie by calling SetMovieMasterTimeBase or SetMovieMasterClock.</p>
<p>Working With Time Base Values<br />
Every time base contains a rate, a start time, a stop time, a current time,<br />
and some status information. The Movie Toolbox provides a number of<br />
functions that allow your application to work with the contents of a time<br />
base. You can use time structures to represent either time values or<br />
durations. Time values specify a point in time, relative to a given time<br />
base. Durations specify a span of time, relative to a given time scale.<br />
Durations are represented by time structures that have the time base set to<br />
0 (that is, the base field in the time structure is set to NIL).</p>
<p>GetTimeBaseTime lets you retrieve the current time value of a time base.<br />
You can set the current time value by calling SetTimeBaseTime; this<br />
function requires you to provide a time structure. Alternatively, you can<br />
set the current time based on a time value by calling SetTimeBaseValue. You<br />
can determine the rate of a time base by calling GetTimeBaseRate. You can<br />
set the rate of a time base by calling SetTimeBaseRate. You can determine<br />
the effective rate of a specified time base (relative to the master time<br />
base to which it is subordinate) by calling GetTimeBaseEffectiveRate. You<br />
can retrieve the start time of a time base by calling GetTimeBaseStartTime.<br />
You can set the start time of a time base by calling SetTimeBaseStartTime.<br />
Similarly, you can use GetTimeBaseStopTime and SetTimeBaseStopTime to work<br />
with the stop time of a time base. The Movie Toolbox provides functions<br />
that allow you to work with the status information of a time base.<br />
GetTimeBaseStatus allows you to read the current status of a time base.<br />
GetTimeBaseFlags helps you obtain the control flags of a time base. You can<br />
set these flags by calling SetTimeBaseFlags.</p>
<p>Hope you can use it for your benefit(s), the plugin comes with a little<br />
sample project.</p>
<p>Alfred N. Van Hoek, Ph.D. (<a href="http://homepage.mac.com/vanhoek/" title="http://homepage.mac.com/vanhoek/">http://homepage.mac.com/vanhoek/</a>)</p>
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