Hi,
I am using mainline kernel 4.1 and I was writing a small application
that uses double buffering to read YUV420 frames from a file at 30fps
and displays them using the overlay plane in the imx-drm driver.
The first issue I noticed is that the image was green so I had to apply
the following patches to make the U and V components be scanned out
properly:
http://lists.freedesktop.org/archives/dri-devel/2014-October/071052.html
http://lists.freedesktop.org/archives/dri-devel/2014-October/071025.html
http://lists.freedesktop.org/archives/dri-devel/2014-October/071048.html
The thing is that, even after applying the 3 patches above, colors are a
bit strange. They seem about right but there are some artifacts, like a
saturation effect that spoils the image. You can see some snapshots here
to see what I am talking about:
https://imageshack.com/i/f0nAM5Xbj
https://imageshack.com/i/hl7bZMNjj
https://imageshack.com/i/eyRjURxRj
And the original video is the first one in this page:
http://media.xiph.org/video/derf/
On the other hand, colors in the primary plane using the fbdev interface
and RGB look correct.
Has anyone seen something similar or is YUV420 working fine for you?
Regards,
Javier.
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