Android MIDI Library


Source link: https://github.com/LeffelMania/android-midi-lib

Android MIDI Library

This project is mainly for use with Android applications that do not have access to Java's javax.sound.midi library. However, it is a stand-alone Java library with no Android-specific dependencies or considerations.

This code provides an interface to read, manipulate, and write MIDI files. "Playback" is supported as a real-time event dispatch system. This library does NOT include actual audio playback or device interfacing.

Example Usage:

Reading and Writing a MIDI file:

File input = new File("example.mid");
 MidiFile midi = new MidiFile(input);
  ...  File output = new File("output.mid");
 midi.writeToFile(output);

Manipulating a MIDI file's data:

Removing a track:

midi.removeTrack(2);

Removing any event that is not a note from track 1:

MidiTrack track = midi.getTracks().get(1);
  Iterator<MidiEvent> it = track.getEvents().iterator();
 List<MidiEvent> eventsToRemove = new ArrayList<MidiEvent>();
  while(it.hasNext()) {

  MidiEvent event = it.next();

 if(!(event instanceof NoteOn) && !(event instanceof NoteOff))
  {

eventsToRemove.add(event);

  
}
 
}
  for(MidiEvent event : eventsToRemove) {

  track.removeEvent(event);
 
}

Reducing the tempo by half:

MidiTrack tempoTrack = midi.getTracks().get(0);
 Iterator<MidiEvent> it = tempoTrack.getEvents().iterator();
  while(it.hasNext()) {

  MidiEvent event = it.next();

 if(event instanceof Tempo)
  {

Tempo tempoEvent = (Tempo)event;

tempoEvent.setBpm(tempo.getBpm() / 2);

  
}
 
}

Composing a new MIDI file:

// 1. Create some MidiTracks MidiTrack tempoTrack = new MidiTrack();
 MidiTrack noteTrack = new MidiTrack();
  // 2. Add events to the tracks // Track 0 is the tempo map TimeSignature ts = new TimeSignature();
 ts.setTimeSignature(4, 4, TimeSignature.DEFAULT_METER, TimeSignature.DEFAULT_DIVISION);
  Tempo tempo = new Tempo();
 tempo.setBpm(228);
  tempoTrack.insertEvent(ts);
 tempoTrack.insertEvent(tempo);
  // Track 1 will have some notes in it final int NOTE_COUNT = 80;  for(int i = 0; i < NOTE_COUNT; i++) {

  int channel = 0;
  int pitch = 1 + i;
  int velocity = 100;
  long tick = i * 480;
  long duration = 120;

 noteTrack.insertNote(channel, pitch, velocity, tick, duration);
 
}
  // 3. Create a MidiFile with the tracks we created List<MidiTrack> tracks = new ArrayList<MidiTrack>();
 tracks.add(tempoTrack);
 tracks.add(noteTrack);
  MidiFile midi = new MidiFile(MidiFile.DEFAULT_RESOLUTION, tracks);
  // 4. Write the MIDI data to a file File output = new File("exampleout.mid");
 try {

  midi.writeToFile(output);
 
}
 catch(IOException e) {

  System.err.println(e);
 
}

Listening for and processing MIDI events

// Create a new MidiProcessor: MidiProcessor processor = new MidiProcessor(midi);
  // Register for the events you're interested in: EventPrinter ep = new EventPrinter("Individual Listener");
 processor.registerEventListener(ep, Tempo.class);
 processor.registerEventListener(ep, NoteOn.class);
  // or listen for all events: EventPrinter ep2 = new EventPrinter("Listener For All");
 processor.registerEventListener(ep2, MidiEvent.class);
  // Start the processor: processor.start();
// This class will print any event it receives to the console public class EventPrinter implements MidiEventListener {

  private String mLabel;

public EventPrinter(String label)
  {

mLabel = label;
  
}

@Override
  public void onStart(boolean fromBeginning)
  {

if(fromBeginning)

{

 System.out.println(mLabel + " Started!");

}

else

{

 System.out.println(mLabel + " resumed");

}

  
}

@Override
  public void onEvent(MidiEvent event, long ms)
  {

System.out.println(mLabel + " received event: " + event);

  
}

@Override
  public void onStop(boolean finished)
  {

if(finished)

{

 System.out.println(mLabel + " Finished!");

}

else

{

 System.out.println(mLabel + " paused");

}

  
}
 
}

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