[Bug 758699] Assume unknown OMX color formats are similar to YUV420

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758699

--- Comment #4 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
(In reply to Mathias Hasselmann (IRC: tbf) from comment #3)
> (In reply to Nicolas Dufresne (stormer) from comment #2)
> > That seems a very crash prone idea for the case where it's not.
> 
> Yes, still we have to find a way to deal with all the undefined color
> formats reported by all this real hardware out in the wild. Actually could
> not find a single Android device that had a H.264 hardware decoder reporting
> any supported color format.

Yes, that way already exist, it's called texture rendering. We are already
working on this.

> 
> Well, guess I should add all the well known formats to the switch statement.
> Any maybe we can have some sanity checks, that verify if the buffer has
> exactly the expected size, as indicated by the chosen color format.

For the mappable memory, the appropriate thing to do is report all the values
that are found and map them. There is additional meta-data for most of these
I420 and NV12 (I believe it's half NV12 and half I420 unlike what you mention).
The size and the stride of I420 and NV12 is exactly the same.

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