[Bug 774213] vaapivideomemory: lock at mapping and unmapping

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=774213

--- Comment #2 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 339492
  --> https://bugzilla.gnome.org/attachment.cgi?id=339492&action=edit
vaapivideomemory: lock map and unmap operations

In order to avoid race condition when two threads call map/unmap the same
VA surface, this patch mutex these operations.

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