Provider for audio file reading services.  Classes providing concrete
implementations can parse the format information from one or more types of
audio file, and can produce audio input streams from files of these types.

Provider for audio file writing services.  Classes providing concrete
implementations can write one or more types of audio file from an audio
stream.

A format conversion provider provides format conversion services
from one or more input formats to one or more output formats.
Converters include codecs, which encode and/or decode audio data,
as well as transcoders, etc.  Format converters provide methods for
determining what conversions are supported and for obtaining an audio
stream from which converted data can be read.

The source format represents the format of the incoming
audio data, which will be converted.

The target format represents the format of the processed, converted
audio data.  This is the format of the data that can be read from
the stream returned by one of the getAudioInputStream methods.

A provider or factory for a particular mixer type.
This mechanism allows the implementation to determine
how resources are managed in creation / management of
a mixer.