[Bug 748990] New: avsamplebuffersink: support CM and CV metas

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=748990

            Bug ID: 748990
           Summary: avsamplebuffersink: support CM and CV metas
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: ilya.konstantinov at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

avsamplebuffersink currently doesn't use CMSampleBuffer or CVPixelBuffer metas
if present in the GstBuffer, instead reconstructing the CVPixelBuffer and
CMSampleBuffer. 

For buffers coming from other applemedia elements, this needlessly locks them
into CPU memory. (And also needlessly does CV and CM housekeeping structure
allocations.)

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