The OGG/Vorbis file format, as defined by » http://www.vorbis.com/, is a scheme
for compressing audio streams by multiple factors with a minimum of
quality loss. This extension adds Ogg Vorbis support to PHP's
URL Wrappers. When used in read mode,
compressed OGG/Vorbis data is expanded to raw PCM audio in one of six PCM
encoding formats listed below.