Can anyone tell me if VDGrabOneFrameAsync is still supported by QT
and the sequence grabber? I've written a VDIG that supports this,
but it is never called... My DeviceInfo returns
digiOutDoesAsyncGrabs as part of info->outputCapabilityFlags.
I *do* see that VDGrabOneFrame is called. Straight after a call to
VDDone returns 'true' (it returns true because the seq.grabber has
not requested any async gets yet)
I don't understand at all why the functions not being called.
Can anyone help?
I suspect GrabOneFrameAsync may have some other pre-required setup/
flag combination before it would be called but I don't have sources
with me to dig around in...however, both GrabOneFrame and
GrabOneFrameAsync are no longer recommened as documented in the
SoftVDigX sample (if you haven't seen it you should take a look).
Use the compress source model, QT treats everything as some type of
compressed source (yes, even uncompressed yuv and rgb pixels) and
the required selector set, and setup are far less confusing not to
mention that it's the recommended approach.
For your reading enjoyment if you're curious, here's a link to the
holy grail of vdig documents...circa 1993 QuickTime 1.5. SoftVDigX
borrows a great deal of information from this document.
http://www.cs.unc.edu/Research/stc/FAQs/1394Firewire/Apple/
king_woodcock_final.html
regards,
edward
Edward Agabeg
WWDR Engineer
QuickTime and Audio
Worldwide Developer Relations
Apple
http://www.apple.com/developer
http://www.apple.com/quicktime
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