[gstreamer-bugs] [Bug 354908] New: videoflipping interface for v4l2src

[GStreamer (bugzilla.gnome.org)]

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 GStreamer | gst-plugins-bad | Ver: HEAD CVS

           Summary: videoflipping interface for v4l2src
           Product: GStreamer
           Version: HEAD CVS
          Platform: Other
        OS/Version: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: ensonic at sonicpulse.de
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: Unspecified
   GNOME milestone: Unspecified


Some cameras export these two controls
#define V4L2_CID_HFLIP                  (V4L2_CID_BASE+20)
#define V4L2_CID_VFLIP                  (V4L2_CID_BASE+21)

Along with that some provice a sensor (e.g. as a HID device) to give info about
flipping status.

The v4l2src needs to implement an interface that exports one or both controls,
to allow apps to flip the video (flipping is done in the camera hardware or the
driver).

The proposal is to add such to gst-plugins-base/gst-libs/gst/interfaces/
as videoflipping.{c,h} -> GST_TYPE_VIDEO_FLIPPING

Apart, would it make sense that
gst-plugins-good/gst/videofilter/gstvideoflip.{c,h} implements this iface?

Finally there is also
#define V4L2_CID_HCENTER                (V4L2_CID_BASE+22)
#define V4L2_CID_VCENTER                (V4L2_CID_BASE+23)

If we'd call the iface e.g. videolayout we can support all of them in one
iface.
The iface migh need a mechanism anyway to report which properties are really
work on the device.

http://www.linuxtv.org/downloads/video4linux/API/V4L2_API/spec/x474.htm


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