libaudacious SDK
VFS — Stream-based I/O in Audacious
Control Socket API ("beepctrl") — Remote access to an Audacious server.
Tuples and Title Formatting — Generating tuples and titles from them.
Formatter — A simple id->substitution class.
RcFile — Manipulation of RcFiles (old XMMS ConfigFile)
XConvert — Resampling and byteswapping.
ConfigDB — The audacious configuration database.
Directory Browser — A directory browser widget.