libmad

MAD is a MPEG audio decoder. It currently supports MPEG-1 and the
MPEG-2 extension to Lower Sampling Frequencies, as well as the
so-called MPEG 2.5 format. All three audio layers (Layer I, Layer II,
and Layer III a.k.a. MP3) are implemented.
MAD supports 24-bit PCM output. MAD computes using 100% fixed-point
(integer) computation, so you can run it without a floating point
unit.

          

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License: GPL-2.0-or-later
URL: http://www.underbit.com/products/mad/