[Mp4-tech] BSAC BITSTREAM FRMAT

[akhalife uci.edu]

Dear Folks
I am using the MPEG 4 BSAC encoder to encode audio files, I need to
be able to interpret the output bitstreams, like where is the bits
of the header, where is the base layer boundary, where and what each
it means...
anyone can tell me where I can get these information? the current
published standard is expensive to buy (around 300$). so is there older
free version that contains these information?
Thanks
Ala