[Bug 794904] New: v4l2bufferpool: Try return input buffer sooner

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=794904

            Bug ID: 794904
           Summary: v4l2bufferpool: Try return input buffer sooner
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nicolas at ndufresne.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

The following patch is an experiment. It needs more testing, but the idea is
that if we have a v4l2 element importing from upstream (v4l2sink or
v4l2transform)
then we want the buffers to be returned as soon as possible.

The current pool design was that it didn't matter leaving the unused buffers in
the
queue as upstream would call acquire, but this does not work if upstream
buffers
are imorted (e.g. upstream pushes dmabuf).

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