Yuv overlay on 848x480?

SDL Development
1

hey there,

I’m trying to create a 848x480 yuv overlay, but the actual area that the
overlay is created on seems to bee 640x480 and the remaining is bright
blue. plus, the image is all scrambled… 640x480 works fine though.
my hardware (i815) supports the 848x480 I believe… or it may be the
software… I’m working on X 4.1.0. I guess what I really want to know
is if the software/hardware can only show 4:3 ratios?

thanks,
Tom

2

Unless you’ve hacked your XF86config, there most probably are no other
modes than the usual 640x480, 1024x768, 1280x1024 etc. 848x480 isn’t even
too common for games, as it’s a widescreen format.

Either way, I don’t think there should be any h/w limits here. Most video
cards seem capable of setting up pretty much any possible mode
(resolution and refresh rate) within their bandwidth, including weird
things way outside what a standard monitor can handle. (Some people have
suceeded in programming standard VGA cards to output PAL or NTSC
frequencies, for example.)

//David Olofson — Programmer, Reologica Instruments AB

.- M A I A -------------------------------------------------.
| Multimedia Application Integration Architecture |
| A Free/Open Source Plugin API for Professional Multimedia |
----------------------------> http://www.linuxdj.com/maia -' .- David Olofson -------------------------------------------. | Audio Hacker - Open Source Advocate - Singer - Songwriter |-------------------------------------> http://olofson.net -'On Friday 15 March 2002 00:56, Tom Fishwick wrote:

hey there,

I’m trying to create a 848x480 yuv overlay, but the actual area that
the overlay is created on seems to bee 640x480 and the remaining is
bright blue. plus, the image is all scrambled… 640x480 works fine
though. my hardware (i815) supports the 848x480 I believe… or it may
be the software… I’m working on X 4.1.0. I guess what I really want
to know is if the software/hardware can only show 4:3 ratios?

3

hey there,

I’m trying to create a 848x480 yuv overlay, but the actual area
that the

overlay is created on seems to bee 640x480 and the remaining is bright
blue. plus, the image is all scrambled… 640x480 works fine though.
my hardware (i815) supports the 848x480 I believe… or it may be
the software… I’m working on X 4.1.0. I guess what I really want to
know is if the software/hardware can only show 4:3 ratios?

Unless you’ve hacked your XF86config, there most probably are no other
modes than the usual 640x480, 1024x768, 1280x1024 etc. 848x480 isn’t
even too common for games, as it’s a widescreen format.

I have hacked my XF86config so it would display properly on widescreen
plasma displays. if I set SDL_VIDEO_YUV_HWACCEL=0 everything works fine.
but when I use the hardware overlay it cuts off that right portion of
the overlay with blue.> On Friday 15 March 2002 00:56, Tom Fishwick wrote:

Either way, I don’t think there should be any h/w limits here. Most
video cards seem capable of setting up pretty much any possible mode=20
(resolution and refresh rate) within their bandwidth, including weird=20
things way outside what a standard monitor can handle. (Some people have
suceeded in programming standard VGA cards to output PAL or NTSC=20
frequencies, for example.)

//David Olofson — Programmer, Reologica Instruments AB

=2E- M A I A -------------------------------------------------.
| Multimedia Application Integration Architecture |
| A Free/Open Source Plugin API for Professional Multimedia |
----------------------------> http://www.linuxdj.com/maia -' =2E- David Olofson -------------------------------------------. | Audio Hacker - Open Source Advocate - Singer - Songwriter |-------------------------------------> http://olofson.net -’

4

[…]

I have hacked my XF86config so it would display properly on widescreen
plasma displays. if I set SDL_VIDEO_YUV_HWACCEL=0 everything works
fine. but when I use the hardware overlay it cuts off that right
portion of the overlay with blue.

Uh oh. Sounds like a driver issue to me. Unfortunately, I don’t have an
i815 chipset machine, and I have very limited experience with YUV
overlays, so I can’t help much there…

//David Olofson — Programmer, Reologica Instruments AB

.- M A I A -------------------------------------------------.
| Multimedia Application Integration Architecture |
| A Free/Open Source Plugin API for Professional Multimedia |
----------------------------> http://www.linuxdj.com/maia -' .- David Olofson -------------------------------------------. | Audio Hacker - Open Source Advocate - Singer - Songwriter |-------------------------------------> http://olofson.net -'On Friday 15 March 2002 21:48, Tom Fishwick wrote: