[Bug 746080] New: v4l2: enumerate output ports and add a property to select input/output

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=746080

            Bug ID: 746080
           Summary: v4l2: enumerate output ports and add a property to
                    select input/output
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: aurelien.zanelli at parrot.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

V4L2 device can have multiple input/output port and they expose them through
ENUMINPUT/ENUMOUTPUT ioctls. But currently we only enumerate input whatever
device is a capture one or an output one. I think, we should enumerate
according to the device type.

Also I think it can be useful to enable user to select which input/output they
want to use. To solve this I propose to add a property to v4l2object to let
user select input/output.

I found this while playing with Vivid which have multiple input/output port.

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