[Bug 784012] decodebin3: Protect dbin->collection with the SELECTION_LOCK

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784012

--- Comment #3 from Thibault Saunier <tsaunier at gnome.org> ---
Created attachment 355518
  --> https://bugzilla.gnome.org/attachment.cgi?id=355518&action=edit
decodebin3: Protect fields related to streams handling with the SELECTION_LOCK

Fields related to stream handling (input_streams,
output_streams, slots, guint slot_id) where used totally unprotected
until know.

This lead to several races, especially playing back RTSP streams.

To protect those fields, the OBJECT_LOCK can not be used as we sometimes
need to be able to post message on the bus while holding it.

decodebin3 already has a lock to manage stream selection, and in the end
it makes sense to protect all the stream management fields with the same
lock which is why we reuse the SELECTION_LOCK here.

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