[MPlayer-dev-eng] [PATCH] Fix inverted colours when capturing YV12 in V4L2 mode

[Jindrich Makovicka]

Luc Gallant wrote:
> Fixes: When capturing YV12 in V4L2 mode, the U and V planes are
> inverted. This is because code was copied from V4L1, and V4L1 had a
> problem with some pixel formats Also fixes some formatting switch case
> entries that were wrong. Details of the YV12 == YVU420 are available
> here: http://v4l2spec.bytesex.org/spec-single/v4l2.html (search YV12)
> 
> How to test if it works: Open up a device that sends YV12 video in
> V4L2, and see if the colours are inverted.
> 
> In my case, I used my loopback driver (which is known to work with the
> YV12 format) to ensure that the patch worked.
> Another way to test is to capture an I420 stream (most capture cards),
> and play it in YV12 format, and make sure the colours are INVERTED
> (since i420 is the opposite of YV12)

What card are you using? I suppose it rather always produces YVU420, 
even if it's asked to produce I420/YUV420. The current code works 
without problems on my saa7134. The plane swapping is used since v4l1 
because at least bt8x8 was unable to produce YV12/YVU420 natively.

-- 
Jindrich Makovicka