[Bug 779790] waylandsink: add offset setting for multiplane dmabuf

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779790

George Kiagiadakis <gkiagia at tolabaki.gr> changed:

           What    |Removed                     |Added
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                 CC|                            |gkiagia at tolabaki.gr

--- Comment #2 from George Kiagiadakis <gkiagia at tolabaki.gr> ---
Created attachment 347818
  --> https://bugzilla.gnome.org/attachment.cgi?id=347818&action=edit
waylandsink: fix memory offset calculation for multi-plane dmabuf buffers

The offset calculation was indeed wrong. In my older implementations I was
using 0 for the offset, which worked at least (while the current implementation
doesn't work for sure). The correct solution is indeed mem->offset + skip,
which works regardless of how many file descriptors & planes there are.

I think the attached patch is doing this correctly now. Nicolas?

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