[Bug 678306] [decodebin2] improve element instance handling

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=678306
  GStreamer | gst-plugins-base | git

Sebastian Dröge <slomo> changed:

           What    |Removed                     |Added
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                 CC|                            |slomo at circular-chaos.org

--- Comment #1 from Sebastian Dröge <slomo at circular-chaos.org> 2012-06-18 12:50:51 UTC ---
(In reply to comment #0)
> [...]
> At least 2 improvements/fixes seem to apply here:
> * arrange for the old element instances to be taken down to e.g. READY
> * put the old elements in some cached-element list so they can be re-used next
> time some such element is needed in a chain (like for example a subsequent
> channel switch).
> 
> [note that keeping the old ones around in READY allows to re-use some global
> setup performed when going to READY]

For this see e2a038acee2969ed0b558093fa1c8b7422073e40 in base too (which was
reverted later because it wasn't optimal). Switching elements to READY is not
trivial here, especially if you want to re-use the elements for the next group
already. (But you can switch them to READY from the streaming thread(s) of the
next group as far as I see it)


Would you keep elements cached for the whole lifetime of decodebin or would
they be removed once the new group is exposed and they're not needed?

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