[Bug 774213] New: vaapivideomemory: lock at mapping and unmapping

[GStreamer (GNOME Bugzilla)]

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

            Bug ID: 774213
           Summary: vaapivideomemory: lock at mapping and unmapping
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: vjaquez at igalia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

As Jan told me a few days ago, we should add a lock when mapping and unmapping
to avoid race conditions when two thread want to map - unmap a frame from vaapi

For example, this pipeline:

gst-launch-1.0 videotestsrc ! vaapipostproc ! tee name=t \
        ! queue ! xvimagesink sync=false 
     t. ! queue ! xvimagesink sync=false

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