[Bug 797047] New: kmssink: Deprecate force-modesetting in favour of "mode" property

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797047

            Bug ID: 797047
           Summary: kmssink: Deprecate force-modesetting in favour of
                    "mode" property
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nicolas at ndufresne.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I think force-modesetting isn't great has a property. As the time goes, we find
that most people uses kmssink in a way one would use decklinkvideosink. It's
basically the "new" way, even though still a bit limited, to handle a video
output. In this regard, the typical use case is to fix the output mode using
well known names, like 1080p60, 1080i60, etc. Basically, the API exposed by
decklinkvideosink.

So my proposal is to replace "force-modesetting" with a mode property. We could
have special values to indicate "current", for the currently configured mode
(our default), "automatic", to try and match the video resolution with the
output, or an alternative of type "best-match". And then, a list of modes.

The decklinkvideosink just hardcodes a fixed list of modes, we could do that,
but then we'd need to improve it everything a DRM driver introduce a new mode.
Maybe we could find a compromise, keep "mode" as a string and match it to one
of the enumerated modes for the connector.

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