Re: yuv and rgb

[Erik Mouw <J A K Mouw ITS TUDelft NL>]

On Wed, Oct 25, 2000 at 02:34:46PM -0300, Matias Freytes wrote:
>       I'm working on video applications and would like to know
> if there are any gdk/gtk routines for converting YUV formats to
> RGB formats, particularly YUV420 to the current RGB format (16bpp
> 565/555, 24bpp, ....) as detected by GdkRGB. I know XFree4
> supports Xv extensions for some cards, but I'd like sthg more
> portable.

Have a look at the conversion routines in mpeg2encode/mpeg2decode
(check www.mpeg.org for the source). They are not fast, but at least
they are correct. Going from YUV420 to RGB goes like YUV420 --> YUV422
--> YUV444 --> RGB. You can speed things up by merging some of the
conversions steps, but I think you should start with the basic
routines. It's easier to get something working fast than to get
something fast working.


Erik

-- 
J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department
of Electrical Engineering, Faculty of Information Technology and Systems,
Delft University of Technology, PO BOX 5031,  2600 GA Delft, The Netherlands
Phone: +31-15-2783635  Fax: +31-15-2781843  Email: J A K Mouw its tudelft nl
WWW: http://www-ict.its.tudelft.nl/~erik/