[Bug 660770] videodecoder, videoencoder: support "partial" frames / slices for raw video

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=660770

--- Comment #14 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
Cisco H264 encoder and decoder implements slice level encoding decoding.

Btw, my explicit fence proposal was just a derivative of Edward proposal. It's
basically a way to make the blocking "map" call cancellable. The reason is that
upstream may deliver a buffer prior to receiving the associated input. The
buffer may end up in error state if the originating buffer was dropped, or the
previous operation failed. At this level of non-determinism, you have to be
able to cancel the operation when going to Null state or flushing.

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