Re: [sqcam-devel] Advice wanted on producing an in kernel sq905 driver

[Hans de Goede <j.w.r.degoede@hhs.nl>]

kilgota@banach.math.auburn.edu wrote:
> 

<snip>

>>>> Correct, there is nothing special you need to do for that, just pass
>>>> frames with the raw bayer data to userspace and set the pixelformat to
>>>> one of: V4L2_PIX_FMT_SBGGR8 /* v4l2_fourcc('B', 'A', '8', '1'), 8 bit
>>>> BGBG.. GRGR.. */ V4L2_PIX_FMT_SGBRG8 /* v4l2_fourcc('G', 'B', 'R', 
>>>> 'G'),
>>>> 8 bit GBGB.. RGRG.. */ V4L2_PIX_FMT_SGRBG8 /*
>>>> v4l2_fourcc('G','R','B','G'), 8 bit GRGR.. BGBG.. */ 
>>>> V4L2_PIX_FMT_SRGGB8
>>>> /* v4l2_fourcc('R','G','G','B'), 8 bit RGRG.. GBGB.. */
> 
> Hmmm. If the userspace app wants the data presented like this, then I 
> would have to take back my previous remark. If the userspace app is 
> supposed to know something about the particular camera, though, my 
> previous remark stands.
> 

No this is just an example, if the cam can send compressed data too for 
example, then we need to define a new V4L2_PIX_FMT_FOO for that, and add suport 
for decompressing that to raw bayer to libv4l. Which could be an issue as 
libv4l is LGPL, to allow using it from any app, so we need to get permission 
from the author(s) to get the decompression code relicensed.

Regards,

Hans

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