Unfortunately BSPlayer does not play cda yet.
It is however (based on information contained in a post of Mat2000 earlier this year) one of the features that
bst (BSPlayer's creator) is presently working on. Whether it will be available (when ready) both for the free version as well as for the Pro version remains to be seen.
When will this feature become available? Well, that's hard to say: I can imagine it is not one of
bst's top priorities as BSPlayer first and foremost is a
videoplayer of course.