[PATCH v2 0/6] MR608: mf: More topology resolution fixes for elements with missing downstream types.

[Rémi Bernon]

Some transforms, such as the EVR mixer do not implement GetInputAvailableType
and may not have any current media type set, though they would accept upstream
media type right away.

--
  v2: mf: Only enumerate types for decoders / converter if down type is missing.
      mf: Only allow converter connection if decoder didn't accept down type.
      mf: Allow resolving topology with missing downstream current type.
      mf/tests: Add more topology loader converter and enumeration tests.
      mf/tests: Add some MP3 decoder transform tests.
      mf/tests: Add some topology loader tests with missing output type.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/608