SoundbankReader supplies soundbank file-reading services.MidiDeviceProvider supplies instances of one or more specific types of MIDI device, possibly including hardware devices.MidiFileReader provides file-reading services that return a MIDI Sequence from a MIDI file for use in an application program.These services make it possible for an application program to save, to a MIDI file, a MIDI Sequence that it has generated or processed. MidiFileWriter provides MIDI file-writing services.There are four abstract classes in the package, which represent four different types of services that you can provide for the MIDI system: This section discusses how to use the package to provide new services for handling MIDI devices and files. The previous section covered the use of the package. By implementing a subclass of one of these abstract classes, a service provider can create a new service that extends the functionality of the runtime system. Introduction to the Service Provider Interfaces explained that the and packages define abstract classes to be used by developers of sound services.
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