[Bug 776931] aggregator: add caps handling

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=776931

Matthew Waters (ystreet00) <ystreet00 at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |ystreet00 at gmail.com

--- Comment #1 from Matthew Waters (ystreet00) <ystreet00 at gmail.com> ---
Created attachment 343000
  --> https://bugzilla.gnome.org/attachment.cgi?id=343000&action=edit
aggregator: add simple support src caps handling

This is a first pass (RFC) at adding src caps handling to aggregator modelled
after videoaggregator.

It seems to work well enough for gst-validate (haven't tried ges's validate)
and the unittests.

I strongly suspect that there are locking problems with the caps handling here
as now the sink setting caps (in the subclasses) uses a different lock to the
src setting/updating the caps.  Not sure if it matters yet though.

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