On Fri, 10 May 2002, Billy Biggs wrote:
> The delay stuff is less important than the field flag.
>
> Mark Vojkovich ([EMAIL PROTECTED]):
>
> > I'd like an XV_FIELD (or better named) attribute that indicates the
> > next PutImage request should upload and display the field rather than
> > the frame which is the default. "0" is top, "1" is bottom, per mpeg
> > conventions. It's a one-shot state that gets reset to frame after the
> > next PutImage happens.
>
> How does this work for full 50 or 59.94fps video? Do I upload the
> same frame twice, or does this attribute just mean: only copy from the
> source frame the even/odd field, so that the whole frame isn't coped
> twice, only half of it?
It means that only the field is copied and only the field is
displayed.
>
> I'm also worried about switching from frame-mode to field-mode. In my
> DVD player for example, I'll switch between 3:2 pulldown correction in
> software, or, if I lose the phase, go back to 60fps output. Do you
> think video cards are going to have a problem switching the scaling
> width/height without artifacts?
NVIDIA cards won't have a problem with this. I think some cheaper
cards that don't double buffer their registers and have to be programmed
during the retrace won't be able to do this very well.
Mark.
_______________________________________________
Xpert mailing list
[EMAIL PROTECTED]
http://XFree86.Org/mailman/listinfo/xpert
