Another 10-bit packed YUV format

[Nicolas Dufresne]

Le jeudi 01 août 2019 à 12:51 -0400, Josh Doe a écrit :
> On Wed, Jul 31, 2019 at 8:16 AM Nicolas Dufresne <nicolas at ndufresne.ca> wrote:
> > Le mercredi 31 juillet 2019 à 06:45 -0400, Josh Doe a écrit :
> > > I'm writing a source for Imperx SDI grabbers, and they seem to use a
> > > format I've not seen before.
> > > 
> > > It's packed 4:2:2 YUV 10 bits per channel, YVYU order, big endian, and
> > > with no padding bits, so they pack 4 components in 5 bytes, and each
> > > row is aligned to 4 bytes. Unless others use this format, it's not
> > > worth adding a new pixel format.
> > 
> > I've seen similar format, I think Rockchip uses similar packing as it's
> > optimal for serial links and memory bandwidth. Feel free to propose a
> > patch to libgstvideo (gst-plugins-base), it seems like a valid format
> > that we'll see again in the future.
> 
> I was misled on the format, and have finally gotten to test the device
> with a working unpack function. Turns out it's 4:2:2 YUV 10 bits per
> channel, YUYV order, little endian, 6 components packed into 64-bits
> with the 4 MSBs unused. So it's very much like v210, just different
> order and padding after six components instead of after three. Not
> sure if anyone else uses this variant.
> 
> I'd be happy to propose a patch, hardest thing would be coming up with
> a name, maybe YUY2_10LE64?

Sounds about the right name, or at least follow my tentative to make a
meaningful naming scheme.

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