[Bug 797251] webrtcbin: might leak resources when changing to NULL

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797251

--- Comment #6 from Aleix Conchillo Flaqué <aconchillo at gmail.com> ---
(In reply to Aleix Conchillo Flaqué from comment #4)

> That is, nothing prevents the idle sources to keep executing when the
> element changes state to NULL. In my app I have a ref to the pipeline and a
> ref to the webrtcbin element. I set the pipeline to NULL and I unref it
> next. At this point I would expect GST_OBJECT_REFCOUNT_VALUE for the
> webrtcbin element to always be 1 (my copy should be the last one), but it's
> not.
>

Also, my app has it's own main loop where I run the gstreamer pipelines. After
setting the pipelines to NULL I stop my main loop. At this point I have no idea
what happens with the webrtcbin idle sources. Since webrtcbin has its own main
loop they should still be executing.

With own of my prints I have seen an idle source blocking here:

_create_transport_channel (...)
{
  ...
  gst_element_sync_state_with_parent (GST_ELEMENT (ret->send_bin));
  gst_element_sync_state_with_parent (GST_ELEMENT (ret->receive_bin));

My guess is that once the pipeline is set to NULL (and the idle source still
running), this will just be blocked somewhere. But since it's an idle source
and it's running on its own main context it will not affect the main
application.

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