Available audio sources

Is there a way to get a list of available audio sources implemented on the device on which the application is running? I want this to allow the user to select from them, however the API does not seem to have anything for this. It just drops to the default if the specified sound source is unavailable. Therefore, it would be useless to display them to the user if they might not even work.

Or is it guaranteed that all Android devices use a certain amount of these sources?

Thanks in advance.