[Mpg123-devel] Non-initialized pointer passed to DCT functions?

[Stephen A C. <schait@MIT.EDU>]

Hello,

I'm Steve Chait and I'm doing a project where I'm designing a hardware mp3
decoder  in Verilog. I've been using mpg123's mpglib as a reference to help me
write my code. One problem I came across was in the III_hybrid function
(mpglib/layer3.c, line 1818). A local pointer called block is set equal to
gmp->hybrid_block, a global field that never seems to be initialized (a string
search for hybrid_block in all of the source files came up empty except for
that one assignment in layer3.c:1822). Then, two more pointers (rawout1 and
rawout2) are set equal to portions of block and passed as arguments to dct36
and dct12. From the complicated arithmetic done using values in rawout1 and
rawout2, it is clear that they get initialized somewhere, and do not just
contain zeroes. But where, and with what data?

Thanks,

Steve