Easily, just like any other passthrough. It doesn't need to know what the application is, just what the application is trying to do. So application would check

Easily, just like any other passthrough. It doesn't need to know what the application is, just what the application is trying to do. So application would check the capabilities of the audio sink, compare that with properties of the source, and if they match, just shuffle the buffers without decoding; let that be a concern later in the pipeline (i.e. hardware). Done.