[Bug 796915] New: v4l2: enhancement request: allow to select device input/output

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796915

            Bug ID: 796915
           Summary: v4l2: enhancement request: allow to select device
                    input/output
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: inigohuguet at hotmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

v4l2src:
-------

Video input devices may have more than one input, and V4L2 allow to select
which one must be used with VIDIOC_S_INPUT ioctl.

Gstreamer doesn't allow to select which input must be used, and users have to
make the ioctl by their own (or calling v4l2-ctl --set-input=X)

It would be good that GStreamer allows to select the input as a property, as a
cap, or in any other convenient way. For example:
v4l2src device=/dev/video0 input=2 ! autovideosink


v4l2sink:
--------

I haven't used video output devices so I don't know how they work, but I guess
it is more or less the same, but with outputs instead of inputs. I see that
VIDIOC_S_OUTPUT ioctl exists in V4L2.


related bug: https://bugzilla.gnome.org/show_bug.cgi?id=796908

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