SiriusMac and Xmac use mplayer to play the internet streams from your Internet Radio Subscription provided by you Satellite Radio provider (either XM or Sirius).

MPlayer is a movie player (licensed under the GNU General Public License (GPL)) which runs on many systems. It plays most MPEG/VOB, AVI, Ogg/OGM, VIVO, ASF/WMA/WMV, QT/MOV/MP4, RealMedia, Matroska, NUT, NuppelVideo, FLI, YUV4MPEG, FILM, RoQ, PVA files, supported by many native, XAnim, and Win32 DLL codecs.