Re: [pwc] Using v4l2 gives grey images

[Luc Saillard <>]

On Thu, Jun 30, 2005 at 02:27:11PM +0300,  wrote:
> >                 n = width * height;
> >                 
> >                 /* offset in Y plane */
> >                 pout_planar_y = dst;
> >                 
> >                 /* offsets in U/V planes */
> >                 pout_planar_u = dst + n;
> >                 pout_planar_v = dst + n + n / 4;
> 
> Why there is "n/4" there, if you also say "to get the pointer to V, you
> add the size of the image (x+y) and size of the image/2".
> Shouldn't it then be:
>                 pout_planar_v = dst + n + n /2;
>                 /* or rather optimized */
>                 pout_planar_v = dst + 3 * n / 2;
> 
> (or am I still abit at sleep due waking just up)
> 
 
No because the half of the square is half of width by half of height. Sorry
for no be precise. So it's normal that is / 4.

Luc
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