Re: YUV Framebuffer

[Geert Uytterhoeven <geert@linux-m68k.org>]

On Tue, 16 Oct 2007, Rhee, C. Joon wrote:
> Is it possible to create framebuffer color format in YUV (eg. YUV422
> interleaved) and expose it through /dev/fb?
> 
> What would be fb_info type?  

What do you mean with `interleaved'?
Even and odd frames are separate (interlace)?

For YUV422, you have to add a new visual type.

A long time ago, I used this for a non-public test project:

#define FB_TYPE_PACKED_PIXELS_LACED     5       /* Interlaced Packed Pixels */
#define FB_TYPE_PACKED_PIXELS_4AREAS    6       /* 4 areas of Packed Pixels */

#define FB_VISUAL_YCBCR422              6       /* YCbCr 4:2:2 */
#define FB_VISUAL_YCBCR420              7       /* YCbCr 4:2:0 */

> And how about about fb_var_screeninfo.green/blue/red offset? 

Just assume red, green, and blue mean Y, U, and V?

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds

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