Yes, finally sources are available in CVS repository. Enjoy it :). I think that they are quite well commented but I still want to write some documentation to let the software design be better understood. Now I'm still working on it in my spare time so the sources are all the time "hot and fresh".
Note that the the font files are not included in CVS and I want to remove the mplayer binary application too and distribute it as a separate release. Though the MPlayer OS X release will of course contain all these files so it plays movies out of the box.