Digging in a bit more... looks like this has more to do with event
processing than with movie controllers. NSMovieView installs some
event handling magic that allows QuickTime to make the callbacks happen.
_murat
On Aug 6, 2005, at 10:52 PM, m wrote:
This is a follow up to <http://lists.apple.com/archives/QuickTime-
API/2005/Jan/msg00178.html> where the poster was trying to get
notifications that a movie had stopped playing. The technique he
was using involves registering a TimeBase callback and is described
at <http://developer.apple.com/qa/qa2001/qa1282.html>. He was
unable to get it to work (the callback was never called). He was
using Cocoa.
I spent the better part of a day trying to use the same technique,
also in Cocoa, to detect when a sound was done playing (i.e. no on
screen presence required, ergo no NSMovieView; just an NSMovie). I
also was not able to get it to work at first.
It turns out that TimeBase callbacks don't work (the callback is
never called) unless there is a MovieController is attached to the
movie (!). Putting an NSMovie in an NSMovieView attaches a
MovieController, and voila! The callback now works.
Why this should be is a mystery. You'd think TimeBase functionality
would be completely independent of MovieControllers (sigh) but
there it is.
Is this a peculiarity of QuickTime in Cocoa, or does it happen in
Carbon apps as well? Or perhaps I missed the documented dependence
of TimeBase callbacks on having MovieControllers attached to Movies?
_murat
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