[Bug 56686] New: Media Source in winegstreamer leaks GStreamer resources if immediately released

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=56686

Bug ID: 56686
           Summary: Media Source in winegstreamer leaks GStreamer
                    resources if immediately released
           Product: Wine
           Version: 9.8
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: winegstreamer
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

A simple program such as:
    IMFSourceResolver_CreateObjectFromURL(resolver, filename,
MF_RESOLUTION_MEDIASOURCE | MF_RESOLUTION_READ, NULL, &type, &obj);
    IUnknown_QueryInterface(obj, &IID_IMFMediaSource, (void**)&ms);
    refcount1 = IUnknown_Release(obj);
    refcount2 = IMFMediaSource_Release(ms);
    printf("refcount %d %d\n", refcount1, refcount2);

shows that winegstreamer leaks resources when the Media Source is immediately
released (i.e. created and then released with neither Start or Shutdown being
called).

When running this on Windows, the value of refcount2 is 0, whilst under Wine it
is the value of the number of Streams. This is because the Streams take a
reference to the Media Source, but do not release it unless Shutdown is called.

I have noticed this in the game Killsquad, which will do this if you quickly
switch between characters. This results in a large number of unused threads
(and other unused resources).