mp2 and mp3 audio decoder source code, I did not understand the specific

libmad-0.15.0b
..............\aclocal.m4
..............\bit.c
..............\bit.h
..............\CHANGES
..............\config.guess
..............\config.h.in
..............\config.sub
..............\configure
..............\configure.ac
..............\COPYING
..............\COPYRIGHT
..............\CREDITS
..............\D.dat
..............\Debug
..............\decoder.c
..............\decoder.h
..............\depcomp
..............\fixed.c
..............\fixed.h
..............\frame.c
..............\frame.h
..............\global.h
..............\huffman.c
..............\huffman.h
..............\imdct_l_arm.S
..............\imdct_s.dat
..............\INSTALL
..............\install-sh
..............\layer12.c
..............\layer12.h
..............\layer3.c
..............\layer3.h
..............\libmad.list.in
..............\ltmain.sh
..............\mad.h
..............\mad.h.sed
..............\Makefile.am
..............\Makefile.in
..............\minimad.c
..............\missing
..............\mkinstalldirs
..............\msvc++
..............\......\config.h
..............\......\Debug
..............\......\libmad.dsp
..............\......\libmad.dsw
..............\......\libmad.ncb
..............\......\libmad.opt
..............\......\libmad.plg
..............\......\mad.h
..............\......\Makefile.am
..............\......\Makefile.in
..............\qc_table.dat
..............\README
..............\rq_table.dat
..............\sf_table.dat
..............\stream.c
..............\stream.h
..............\synth.c
..............\synth.h
..............\timer.c
..............\timer.h
..............\TODO
..............\VERSION
..............\version.c
..............\version.h

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