[pwc] Using v4l2 gives grey images

[Niclas Anderberg <>]

I am trying to use the latest driver version (10.0.7a) using v4l2. I 
have written my own sample app which reads frames from the camera and 
writes jpeg images.
I am getting images fine, but they are somehow grey scale. When I do my 
colorspace conversion I assume the output is planar, as per the "v4l2 
video image format specification". I.e. first imagesize bytes of Y data 
then imagesize / 4 bytes of U data and finally imagesize / 4 bytes of V 
data.
When I query the driver for which format it uses (after I've tried to 
set it differently :), it says V4L2_PIX_FMT_YUV420. If I inspect the U 
and V values in the image I got from the camera, they are close to 128 
in both U and V (i.e. the image is grey).
If I use an app like camE (which I assume uses v4l and v4l2) I get color 
fine. Is there a restriction in the v4l2 driver that I don't know about? 
   Does anyone have some simple sample code which gives you color 
images? Any other ideas?
Thanks!
Niclas

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