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Field Trip #20

Creating Simple Music By Keith Lynn. Field Trip #20. Midi. Midi stands for Musical Instrument Digital Interface It is an interface that allows a variety of instruments to connect and communicate with each other A single midi link can carry up to 16 channels of information

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Field Trip #20

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  1. Creating Simple Music By Keith Lynn Field Trip #20

  2. Midi • Midi stands for Musical Instrument Digital Interface • It is an interface that allows a variety of instruments to connect and communicate with each other • A single midi link can carry up to 16 channels of information • We can connect a channel to a different device

  3. Midi cont'd • A Midi Event message carries information about • Pitch • Notation • Velocity • Volume • etc

  4. Instrument • An instrument is represented by an integer between 0 and 255 • You can find a list of instruments at http://www.ccarh.org/courses/253/handout/gmiinstruments

  5. Creating the Midi • In order to create the midi, we will create a Sequencer • After we create the Sequencer, we open it • We create a Sequence • The Sequence is made of Tracks • The Tracks are made up of MidiEvents • The MidiEvent is composted of a MidiMessage and a tick. The tick indicates the time in the sequence where the event fires

  6. MidiMessage • In this app, we will create a simple message • A ShortMessage contains two bytes of information • To create the ShortMessage, we specify four things • A Midi command • A channel • The first data byte • The second data byte

  7. Midi Commands • The ShortMessage class contains constants that represent Midi commands • Some of the most common are • Note on – Start Playing • Note off – Stop Playing • Program change – Specify what instrument is on a channel

  8. Playing Notes • The third parameter to create the ShortMessage is a note • Middle C is 60 • The fourth parameter is the velocity • Typically we can use 100

  9. Playing the sound • In order to play the Midi sound, we create the ShortMessages and create a MidiEvent • The MidiEvent specifies the ShortMessage and the tick • The tick is the time when the event fires

  10. Creating the Midi Player • In our app, we allow the user to specify through Java components, the values to create a ShortMessage • These ShortMessages appear in a Jpanel • When we are ready to play, we click Play and each of the MidiMessages are put into a track, and the track put in a sequence, and the sequence put in the sequencer

  11. Storing MidiEvents • In our app, we create a Jpanel called a MidiMessagePanel • This class is declared to be Serialiazable • This means that instances of the class can be written to a file • Later we can read them back in • In order to write the objects, we use an ObjectOutputStream, and in order to read the objects, we use an ObjectInputStream

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