Re: [PATCH v6 0/9] MR8531: mfmediaengine: Support video output in formats unsupported by the session engine.

[Conor McCarthy (＠cmccarthy)]

The topology loader doesn't set types on the sink, nor does the session engine if `MFSESSION_SETTOPOLOGY_NORESOLUTION` is specified, and tests already exist for this. Setting the audio sink type is quite involved, but I see no other option.

I cleaned things up and added tests for scale down and letterbox.