[Bug 797128] videoaggregator: Notify drained status of a videoaggregator pad

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797128

--- Comment #4 from Seungha Yang <pudding8757 at gmail.com> ---
(In reply to Sebastian Dröge (slomo) from comment #3)
> This has to be added to the base class aggregator, or not? It also has a
> queue of buffers that is in addition to the one buffer in videoaggregator.

Probably "drained" information could be useful for every subclass of
aggregator, and therefore adding new property/signal to aggregator seems to be
more reasonable. But we need vfunc for checking "drained (i.e., EOSed and also
empty queue)" since most subclass has their own queue in addition to queue of
baseclass... I'll take a look at more

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