`madplay' is a command-line MPEG audio decoder and player based on the MAD
library (libmad).

After decoding, `madplay' sends the output to an audio output module. The
following audio output modules are provided:

  - an Open Sound System interface module (for Linux, et al.)
  - a Sun audio interface module (for Solaris, NetBSD, et al.)
  - a Mac OS Carbon audio interface module (for Mac OS X)
  - a Win32 audio interface module (for Windows 95/98/NT/2000, et al.)
  - an ALSA audio interface module
  - a QNX audio interface module
  - an EsounD interface module
  - a CD audio output module (*.cdr, *.cda)
  - an Audio IFF output module (*.aif, *.aiff)
  - a Microsoft RIFF/WAVE file output module (*.wav)
  - a Sun/NeXT audio file output module (*.au, *.snd)
  - a raw PCM output module
  - a hex output module (for debugging and compliance testing)
  - a null module (for timing the decoder)

`madplay' will also read and display ID3 tag information, and further
supports the relative volume adjustment information (RVA2) in such tags,
as written by tools like `normalize'.