[Bug 762999] New: Memory leak in qmlglsink

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=762999

            Bug ID: 762999
           Summary: Memory leak in qmlglsink
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: serge.borovkov at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 322889
  --> https://bugzilla.gnome.org/attachment.cgi?id=322889&action=edit
Fix memory leak

There is a memory leak with opengl contexts.
There is 2 context being created:
this->priv->other_context =           gst_gl_context_new_wrapped
(this->priv->display, gl_handle, platform, gl_api);
widget->priv->context = gst_gl_context_new (widget->priv->display);

Sink acquires them via qt_item_get_qt_context/qt_item_get_context which do
gst_object_ref before returning object.

The attachment fixes the issue on my side. Context get properly deleted and
associated thread quits. I am not sure though if my attachment would work in
all cases - if window is hidden opengl context would be lost. But this case is
already not handled by qmlglsink so I did not make any changes).

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