Skip to content

Instantly share code, notes, and snippets.

@flamendless

flamendless/MIDISequenceExtractor.java

Created May 14, 2019 09:53
Download ZIP

Revisions

  1. flamendless created this gist May 14, 2019.
    110 changes: 110 additions & 0 deletions MIDISequenceExtractor.java
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,110 @@
    package midisequenceextractor;

    import java.io.File;
    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    import javax.sound.midi.InvalidMidiDataException;
    import javax.sound.midi.MidiChannel;
    import javax.sound.midi.MidiEvent;
    import javax.sound.midi.MidiMessage;
    import javax.sound.midi.MidiSystem;
    import javax.sound.midi.MidiUnavailableException;
    import javax.sound.midi.Sequence;
    import javax.sound.midi.Sequencer;
    import javax.sound.midi.ShortMessage;
    import javax.sound.midi.Synthesizer;
    import javax.sound.midi.Track;

    public class MIDISequenceExtractor {

    public static void main(String[] args) throws MidiUnavailableException, InvalidMidiDataException, IOException {
    List<Integer> notes = new ArrayList<>();

    Synthesizer synthesizer = MidiSystem.getSynthesizer();
    synthesizer.open();
    MidiChannel midiChannel = synthesizer.getChannels()[0];

    Sequence sequence = MidiSystem.getSequence(new File("ThroughTheYears.mid"));

    int track_to_use = 3;

    Sequencer seq = MidiSystem.getSequencer();
    seq.open();
    seq.setSequence(sequence);
    seq.setTrackSolo(track_to_use, true);
    seq.start();

    System.out.println("resolution: " + sequence.getResolution());

    Map<Long, List<MidiEvent>> events = new HashMap<Long, List<MidiEvent>>();

    int maxTracks = sequence.getTracks().length;

    System.out.println("Max Tracks:" + maxTracks);

    Track track = sequence.getTracks()[track_to_use];
    for (int i = 0; i < track.size(); i++) {
    MidiEvent me = track.get(i);
    Long tick = me.getTick();
    List<MidiEvent> list = events.get(tick);
    if (list == null) {
    list = new ArrayList<MidiEvent>();
    events.put(tick, list);
    }
    list.add(me);

    Long tick = 0l;
    while (tick <= sequence.getTickLength()) {
    List<MidiEvent> list = events.get(tick);
    if (list != null) {
    for (MidiEvent me : list) {
    MidiMessage midiMessage = me.getMessage();

    switch (midiMessage.getStatus() & ShortMessage.NOTE_ON) {
    case ShortMessage.NOTE_ON:
    int note = (int) (midiMessage.getMessage()[1] & 0xff);
    int velocity = (int) (midiMessage.getMessage()[2] & 0xff);
    midiChannel.noteOn(note, velocity);
    //System.out.println("tick: "+ tick + " note_on: " + note);
    notes.add(note);
    break;
    case ShortMessage.NOTE_OFF:
    int note2 = (int) (midiMessage.getMessage()[1] & 0xff);
    //int velocity2 = (int) (midiMessage.getMessage()[2] & d0xff);
    midiChannel.noteOff(note2);
    //System.out.println("tick: "+ tick + " note_off: " + note2);
    notes.add(254);
    break;
    }
    System.out.println();
    }
    }
    else {
    // ignore
    notes.add(255);
    }
    //Thread.sleep(6);
    //System.out.println("----------------------");
    tick += 8;
    }


    System.out.println("music size: " + notes.size());
    for (int i = 0; i < notes.size(); i++) {
    int noteInt = notes.get(i);
    String noteStr = "00" + Integer.toHexString(noteInt);
    noteStr = noteStr.substring(noteStr.length() - 2, noteStr.length());
    noteStr = "0" + noteStr + "h";

    if (i % 16 == 0) {
    System.out.print("\r\n\tdb ");
    }

    System.out.print(noteStr + (i % 16 == 15 ? "" : ", "));
    }
    }

    }