v4l2 autodetect

[Nicolas Dufresne]

Le mardi 14 juillet 2015 à 06:57 -0700, Leo.Fernando a écrit :
> can you please tell me how to set width,height,framerate through 
> regular
> way? may be that will work for me

If the question was from V4L2 API / Driver side. VIDIOC_S_FMT is a fail
safe function. Instead of failing, it should replace the invalid values
to match something valid (usually done by rounding middle in drivers).
VIDIOC_TRY_FMT should have the same effect as VIDIOC_S_FMT, except it
should not actually apply the change (and should work even if the
driver is busy). On fancier implementation, VIDIOC_ENUM_FMT,
VIDIOC_ENUM_FRAMESIZES and VIDIOC_ENUM_FRAMEINTERVALS will allow
complete enumeration of the color formats, frame sizes (width, height)
and frame interval (careful this is 1 / framerate).

Nicolas
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