a52dec is a test program for liba52.
It decodes ATSC A/52 streams, and also includes a demultiplexer for 
mpeg-1 and mpeg-2 program streams.
This package also includes liba52
liba52 is a free library for decoding ATSC A/52 streams.
The A/52 standard is used in a variety of applications,
including digital television and DVD. It is also known as AC-3.

This SlackBuild doesn't compile against djbfft.