[libdvdread] how to get all the files of a title ?

Hello,

i've begun to use libdvdread and I try to read the files on a dvd. In 
particular, I have those, for title #2 :

VTS_02_1.VOB
VTS_02_2.VOB
VTS_02_3.VOB

But with DVDOpenFile, I only get one file. The size of the file is the sum 
of these 3 files.

Is it possible to access each of these 3 files with a function of 
libdvdread ?

thank you

Vincent Torri

PS: is there any tutorial on libdvdread ?