Chip,
I had hoped that your patch would allow mcicda to work, cf. bug #20323, alas it is not so. Instead I get to see
ERR("This version of Mac OS X does not support IOCDAudioControl" on Leopard.
I googled slightly and found a message from 2004: http://lists.apple.com/archives/darwin-drivers/2004/Jul/msg00049.html
IOCDAudioControl is deprecated if not obsolete.
Therefore I believe the user should not be bothered with a reference to something deprecated half a decade ago and unavailable. A subsequent patch to a simple FIXME("NIY\n") would be enough. Please leave IOCDAudioControl in a comment in the code at most.
Reading further, it looks like there's nothing to read audio CDs anymore. Instead, developers are recommended to take advantage of the cddafs, which mounts all audio tracks as "/Volumes/Audio-CD/01 Titel 1.aiff" and to play those files with CoreAudio instead. I've checked that mixed CDs with both data files and audio tracks let 2 CD icons appear on the Finder's desktop, e.g. /Volumes/ABC/ and /Volumes/Audio-CD/
So I wonder whether mcicda on Mac OS should forward calls to waveaudio and play .aiff files instead. I don't know how ntdll and the mountmgr etc. could be changed to accomodate the separation in two volumes, i.e. how to map both /Volumes/ABC and /Volumes/Audio-CD/ to D:\
Regards, Jörg Höhle.