[Bug 790057] waylandsink does not respect video alignment from upstream

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790057

--- Comment #4 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 363550
  --> https://bugzilla.gnome.org/attachment.cgi?id=363550&action=edit
waylandsink: Apply buffer offsets and strides

I could not test this patch as my weston is too old (does not have working NV12
SHM support). Would be nice to report if this solution works for you.

When we propose a pool it is possible that the pool changes the default
offsets and strides as it may get a GstVideoAlignment in it's
configuration. For this reason, we need to read-back in all cases the
strides and offsets from the GstVideoMeta.

This was already done when copying through gst_video_frame_map(), but was
missing when importing file descriptors as SHM.

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