Question re: hd audio and mac

Hi all - if i configure the audio in xbmc eden to not output dolby or dts over hdmi, it decodes to lpcm and i hear multi channel audio properly.

In the case of dts-ma and dolby true hd, does this mean xbmc is decoding the hd audio and transcoding on the fly to lpcm? Am i just getting the dts-core decoded?

Thanks