The Vorbis General Audio Compression Codec (High Level API)

 Ogg Vorbis is a fully open, non-proprietary, patent-and-royalty-free,
 general-purpose compressed audio format for audio and music at fixed
 and variable bitrates from 16 to 128 kbps/channel.
 .
 The Vorbisfile library provides a convenient high-level API for decoding
 and basic manipulation of all Vorbis I audio streams.