[Bug 720568] v4l2: Various changes to allow using M2M decoders

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=720568
  GStreamer | gst-plugins-good | git

--- Comment #56 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2014-01-07 21:03:46 UTC ---
(In reply to comment #42)
> (From update of attachment 264359 [details])
> Is this maybe valid for encoded streams?

gst_v4l2_object_setup_format() is for when we let the driver decides the
format. It's currently only tested for decoders, which decides a raw format.
I've added this check to catch earlier a race in the driver I'm working on. I
think it's good enough, I could probably also check that the format is raw, as
reported by Micheal, his decoder does not make any decision and report an
encoded default format. I would suggest to revisit these check later if we have
more use cases and a way to test them.

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