[Bug 733750] New: v4l2object: query minimum required buffers for output

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=733750
  GStreamer | gst-plugins-good | git

           Summary: v4l2object: query minimum required buffers for output
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: aurelien.zanelli at parrot.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=281714)
 View: https://bugzilla.gnome.org/attachment.cgi?id=281714
 Review: https://bugzilla.gnome.org/review?bug=733750&attachment=281714

v4l2object: query minimum required buffers for output

As suggested by Nicolas, V4L2 devices could expose a minimum buffers count
through the CTRL ioctl. So instead of blindly propose a pool with default
value, we may ask the driver first.

I attached a patch which basically do this in
gst_v4l2_object_propose_allocation(). 

But I don't found any device using this control, so for test, I just modify my
v4l2 drivers.

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