On Thu, 18 Jul 2002, Guido Fiala wrote:
> >API docs are in the server tree at xc/doc/hardcopy/Xv. There
> >are DEC's original docs there and the version 2.2 addendum.
>
> Thanks too.
> However - that does'nt seem to be more than just the man-pages.
>
> I'am missing documentation about the XV_FREQ atom - what is the purpose and
> unit of the freq interger?
These are all driver-specific properties and not something that would
be in a general API description. For the most part these just shadow
the V4L attributes.
> (It seems anything works the same with and without setting that at all)
> Also - i don't see why i should use the Put/GetVideo calls at all, they don't
> seem to do anything useful for me.
>
> Another thing - where are the number of available _input_ formats (color
> spaces) specified?
> I mean - why are just those available listed by xvinfo and not e.g. RGB565
> or RGB24 which would give much better output quality than YUV2 from v4l
> devices!?
Are you speaking of XvImage formats or something else? XvImage
formats are formats the hardware supports. There are no software fallbacks
in any Xv drivers that I've seen, so if the hardware doesn't do it,
it doesn't get advertised.
Video is not in RGB. Video is always in YUV. I don't think it's
possible for an RGB format to have better quality if the video source
is in YUV.
Mark.
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