[Bug 775377] New: opencv: cvlaplace/cvsobel/edgedetect should use the already mapped outimage

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=775377

            Bug ID: 775377
           Summary: opencv: cvlaplace/cvsobel/edgedetect should use the
                    already mapped outimage
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nicolas at ndufresne.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Those element maps again the output buffer in order to write the result. In
fact, the buffer is already mapped and accessible through the IplImage. The
implementation of the map also ignores VideoMeta and ignore the map return
value.

It's likely that we can save a copy while fixing this.

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