Example usage for javax.sound.midi Sequence getTracks

Introduction

In this page you can find the example usage for javax.sound.midi Sequence getTracks.

Prototype

public Track[] getTracks() 

Source Link

Document

Obtains an array containing all the tracks in this sequence.

Usage

From source file:at.ofai.music.util.WormFileParseException.java

public static EventList readMidiFile(String fileName, int skipTrackFlag) {
    EventList list = new EventList();
    Sequence s;
    try {//from www  .  j  a  v  a  2s  . c  o m
        s = MidiSystem.getSequence(new File(fileName));
    } catch (Exception e) {
        e.printStackTrace();
        return list;
    }
    double midiTempo = 500000;
    double tempoFactor = midiTempo / s.getResolution() / 1000000.0;
    // System.err.println(tempoFactor);
    Event[][] noteOns = new Event[128][16];
    Track[] tracks = s.getTracks();
    for (int t = 0; t < tracks.length; t++, skipTrackFlag >>= 1) {
        if ((skipTrackFlag & 1) == 1)
            continue;
        for (int e = 0; e < tracks[t].size(); e++) {
            MidiEvent me = tracks[t].get(e);
            MidiMessage mm = me.getMessage();
            double time = me.getTick() * tempoFactor;
            byte[] mesg = mm.getMessage();
            int channel = mesg[0] & 0x0F;
            int command = mesg[0] & 0xF0;
            if (command == ShortMessage.NOTE_ON) {
                int pitch = mesg[1] & 0x7F;
                int velocity = mesg[2] & 0x7F;
                if (noteOns[pitch][channel] != null) {
                    if (velocity == 0) { // NOTE_OFF in disguise :(
                        noteOns[pitch][channel].keyUp = time;
                        noteOns[pitch][channel].pedalUp = time;
                        noteOns[pitch][channel] = null;
                    } else
                        System.err.println("Double note on: n=" + pitch + " c=" + channel + " t1="
                                + noteOns[pitch][channel] + " t2=" + time);
                } else {
                    Event n = new Event(time, 0, 0, pitch, velocity, -1, -1, 0, ShortMessage.NOTE_ON, channel,
                            t);
                    noteOns[pitch][channel] = n;
                    list.add(n);
                }
            } else if (command == ShortMessage.NOTE_OFF) {
                int pitch = mesg[1] & 0x7F;
                noteOns[pitch][channel].keyUp = time;
                noteOns[pitch][channel].pedalUp = time;
                noteOns[pitch][channel] = null;
            } else if (command == 0xF0) {
                if ((channel == 0x0F) && (mesg[1] == 0x51)) {
                    midiTempo = (mesg[5] & 0xFF) | ((mesg[4] & 0xFF) << 8) | ((mesg[3] & 0xFF) << 16);
                    tempoFactor = midiTempo / s.getResolution() / 1000000.0;
                    //   System.err.println("Info: Tempo change: " + midiTempo +
                    //                  "  tf=" + tempoFactor);
                }
            } else if (mesg.length > 3) {
                System.err.println("midi message too long: " + mesg.length);
                System.err.println("\tFirst byte: " + mesg[0]);
            } else {
                int b0 = mesg[0] & 0xFF;
                int b1 = -1;
                int b2 = -1;
                if (mesg.length > 1)
                    b1 = mesg[1] & 0xFF;
                if (mesg.length > 2)
                    b2 = mesg[2] & 0xFF;
                list.add(new Event(time, time, -1, b1, b2, -1, -1, 0, b0 & 0xF0, b0 & 0x0F, t));
            }
        }
    }
    for (int pitch = 0; pitch < 128; pitch++)
        for (int channel = 0; channel < 16; channel++)
            if (noteOns[pitch][channel] != null)
                System.err.println("Missing note off: n=" + noteOns[pitch][channel].midiPitch + " t="
                        + noteOns[pitch][channel].keyDown);
    return list;
}

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