New port liba52 version 0.7.1b: A free library for decoding ATSC

A/52 streams, aka AC-3

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+[ from developer's site ]
+It is a free library for decoding ATSC A/52 streams, aka AC-3. The
+A/52 standard is used in a variety of applications, e.g., digital
+television and DVD. The main goals in liba52 development are:
+
+Portability - most of the code is written in C, and when we use
+platform-specific optimizations we always have a generic C routine
+to fall back on.
+
+Reuseability - we do not want liba52 to include any project-specific
+code, but it should still include enough features to be used by
+very diverse projects.
+
+Precision - We are trying to implement all of the A/52 standard,
+and to have a very precise output by doing all the calculations in
+floating point. We have a test suite that detects any deviation in
+the output when compared to previous versions. We do not have access
+to official A/52 test vectors though, so we have to use our judgement
+to ensure that such deviations are only intruduced when we fix bugs!
+
+Speed - liba52 is really fast, on any modern PC it should take only
+a few percent of CPU time.
+
+WWW: http://liba52.sourceforge.net/