Wrong offset when using cdda_track_firstsector()

Hello all,

When using cdda_track_firstsector() from libcdparanoia0 3a9.8-11 (Debian
Sarge) I get a number that is 150 less than the track offsets I get
using the freedb.org "reference" implementation from

http://jeremy.zawodny.com/c/discid/

The offsets from `discid' seems to be the correct ones (found by
comparing the offsets with the ones in the freedb.org database).
What could be causing this and will this value (150) vary from
cdrom-drive to cdrom-drive? What can be done to ensure that the offset
values correspond?

Thanks in advance!

-- 
Oddbjørn Kvalsund