How to convert PDB file of Amino Acids to rotamer tuples list of all AAs instances
I’m not sure if it is what you are after, but I have used Roland Dunbrack's dihedral perl script to get dihedral angles, the header of which is:

 RL_Dunbrack@fccc.edu

 usage 
 dihedral.pl filename [chain]

 dihedral.pl pdb2hla.ent 
     will print out all dihedrals from file pdb2hla.ent
 dihedral.pl pdb2hla.ent A
     will print out dihedrals only from chain A


I don’t know if it’s on his website as I got it from him personally. If not, or even if it’s not what you need, email him — he is likely to be able to help you.