[Tremor] Question about "vorbis_book_decode()"

[Hans Petter Selasky]

Hi,

I am currently trying to understand the integer codec of Ogg Vorbis, Tremor. 
There is one function I wonder about, and that is "vorbis_book_decode()".

Does this function work like a pallette, looking up a larger value from a 
smaller value ? 

Is this lookup dynamic or static ?

--HPS