[IDEA] Analog audio for .flac/mp3 and hdmi audio for .mkv/avi

[Trinket]

I have never used c++ and I'm quite new to Python, but I still would like to try making it.
I know how to make the script autostart in XBMC (I have recently made a fairly simple script) it's just that I don't know how to control the audio output with commands.
What's the command that's called when i switch from analog to hdmi audio output within xbmc?