ems: implement discid calculation and use cdio functions
ems: implement discid calculation and use cdio functions

raoulh/Enna-Media-Server,raoulh/Enna-Media-Server,enna-project/Enna-Media-Server,raoulh/Enna-Media-Server,enna-project/Enna-Media-Server,raoulh/Enna-Media-Server,enna-project/Enna-Media-Server,enna-project/Enna-Media-Server,enna-project/Enna-Media-Server,raoulh/Enna-Media-Server