YUV to RGB Conversion by Hardware

SDL Development
#1

Has anyone had this problem before?

Converting every pixel from YUV to RGB is
extremely slow.
Is it possible that the Geforce2 does that for me?

And I don’t exactly understand the use of
"SDL_Overlay – YUV video overlay"
can SDL also do the conversion?

Thanks a lot,

Joe

#2

I don’t know if you can get hardware to do it, but if you know what
processor you’re running the code on you can optimize the conversion
using MMX/SSE/whatever equivalent type code. Here’s a tutorial for MMX
on the Intel site:

http://cedar.intel.com/cgi-bin/ids.dll/content/content.jsp?cntKey=Legacy::irtm_AP548_9996&cntType=IDS_EDITORIAL

I’ve used something similar before, and it’s much faster than doing a
single pixel at a time. I imagine it would be faster still if you could
do it in hardware, but this should at least get you some more desirable
framerates :slight_smile:

-MikeOn Tue, 2003-07-22 at 08:03, redwhitered at gmx.net wrote:

Has anyone had this problem before?

Converting every pixel from YUV to RGB is
extremely slow.
Is it possible that the Geforce2 does that for me?

And I don’t exactly understand the use of
"SDL_Overlay – YUV video overlay"
can SDL also do the conversion?

Thanks a lot,

Joe

#3

I’m not sure about withing SDL, but several other libraries provide good
example code for this. You might take a look at libavcodec (part of
ffmpeg) for fast colorspace conversions. You can either grab the source
that applies to your situation (assuming the LGPL license isn’t a
problem), or just use the library routines.

-JustinOn Tue, 2003-07-22 at 08:03, redwhitered at gmx.net wrote:

Has anyone had this problem before?

Converting every pixel from YUV to RGB is
extremely slow.
Is it possible that the Geforce2 does that for me?

And I don’t exactly understand the use of
"SDL_Overlay – YUV video overlay"
can SDL also do the conversion?

Thanks a lot,

Joe