[Bug 779146] dmabuf: be able to negotiate tiled surfaces

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779146

--- Comment #51 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
The single stride is a recurring issue with V4L2, but also UVC and other
standard to which the planar formats were added after the fact. One thing to
note, GStreamer, outside vaapi, is rarely involved in DRM to DRM memory
sharing. Instead we deal with cross kernel domain sharing, and the is little
talk among devs there. Hopefully padovan nomination will help long term.
Another issue is the cache coherency, e.g. shall we use the dma sync API, when,
why. Which case is driver bug ? I'm thinking about the visual artifact when you
render UVC or vivid buffer to DRM display. I've reported this a long time ago,
and I still have no clue who's faut, what need fixing.

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