ActiveAE: Also verify DTS and AC3 capabilities

Basically in http://trac.xbmc.org/ticket/14927 a user chose DirectSound device and asked why DTS is not working. From my knowledge, I think DTS does not work with DirectSound (only AC3 and WM Pro).

So we should also verify those too.


That needs testing - I don't have windows, already pinged @jjd-uk on IRC