Java Code Examples for javax.sound.midi.Track#get()

public static final void addNotesToTrack(final Track track, final Track trk) throws InvalidMidiDataException {
    for (int ii = 0; ii < track.size(); ii++) {
        final MidiEvent me = track.get(ii);
        final MidiMessage mm = me.getMessage();
        if (mm instanceof ShortMessage) {
            final ShortMessage sm = (ShortMessage) mm;
            final int command = sm.getCommand();
            int com = -1;
            if (command == ShortMessage.NOTE_ON) {
                com = LOCAL_NOTE_ON;
            } else if (command == ShortMessage.NOTE_OFF) {
                com = LOCAL_NOTE_OFF;
            }
            if (com > 0) {
                final byte[] b = sm.getMessage();
                final int l = (b == null ? 0 : b.length);
                final MetaMessage metaMessage = new MetaMessage(com, b, l);
                final MidiEvent me2 = new MidiEvent(metaMessage, me.getTick());
                trk.add(me2);
            }
        }
    }
}
 

public final Track mergeShortMessageEvent(final Track[] tracks) {
    final Track trk = sequence.createTrack();
    for (final Track track : tracks) {
        for (int i = 0; i < track.size(); i++) {
            final MidiEvent evt = track.get(i);
            final MidiMessage mm = evt.getMessage();
            if (mm instanceof ShortMessage) {
                trk.add(evt);
            }
        }
    }
    return trk;
}
 

public static void main(String argv[]) throws Exception {
    Sequence seq = new Sequence(Sequence.PPQ, 240);
    Track t = seq.createTrack();

    log("add 10 events in random order");
    t.add(createEvent(10, 5));
    t.add(createEvent(0, 0));
    t.add(createEvent(10, 6));
    t.add(createEvent(11, 8));
    t.add(createEvent(10, 7));
    t.add(createEvent(0, 1));
    t.add(createEvent(0, 2));
    t.add(createEvent(15, 9));
    t.add(createEvent(0, 3));
    t.add(createEvent(1, 4));

    // now compare the events.
    // The note param will tell us the
    // the expected position
    long lastTick = 0;
    for (int i = 0; i < t.size(); i++) {
        MidiEvent ev = t.get(i);
        if (ev.getMessage() instanceof ShortMessage) {
            ShortMessage msg = (ShortMessage) ev.getMessage();
            log(""+i+": ShortMessage at tick "+ev.getTick()
                +" with expected position "+msg.getData1());
            if (ev.getTick() < lastTick) {
                log("  FAILED: last tick is larger than this event's tick!");
                failed = true;
            }
            if (i != msg.getData1()) {
                log("  FAILED: Track did not order correctly.");
                failed = true;
            }
        }
    }

    if (failed) throw new Exception("Test FAILED!");
    log("Test passed.");
}
 

public void decode(final float[] data, final int frameSize, final int updatePeriod, final int samplingRate,
        final int nBits) {
    if (frameSize <= 0) {
        throw new IllegalArgumentException("Frame size must be greater than zero");
    }
    final Track track = mergeShortMessageEvent(sequence.getTracks());
    final float length = 1e-6f * sequence.getMicrosecondLength();
    final float ts = 1.0f / samplingRate;
    final long trackTicks = track.ticks();
    final float tickLength = trackTicks <= 0 ? 0 : length / trackTicks;
    final int frameCount = data.length / frameSize;
    final float scale = 2 << Math.max(1, nBits + 1);

    final int fftSize = 2 * frameSize;
    final FloatFFT_1D fft = new FloatFFT_1D(fftSize);
    final float[] apodization = new float[fftSize];
    for (int i = 0; i < fftSize; i++) {
        apodization[i] = (float) Apodization.Hann.getIndex(i, apodization.length);
    }

    int frameCounter = 0;
    int tickIndex = 0;
    final float[] waveForm = new float[2 * frameSize];
    final int nUpdateDistance = (int) (updatePeriod / 1000.0 * samplingRate);
    for (int i = 0; frameCounter < frameCount; i++) {
        final float t = i * ts;
        final MidiEvent tickEvt = track.get(tickIndex);
        final float tickTimeStamp = tickEvt.getTick() * tickLength;

        // update waveform by one sample
        update(samplingRate, nBits);

        if ((t > tickTimeStamp) && (tickIndex < track.size() - 1)) {
            if ((tickEvt.getMessage() instanceof ShortMessage)) {
                final ShortMessage sm = (ShortMessage) tickEvt.getMessage();
                final int note = sm.getData1() & 0xFF;
                final int velocity = sm.getData2() & 0xFF;

                final int command = sm.getCommand();
                if ((command == ShortMessage.NOTE_ON) || (command == LOCAL_NOTE_ON)) {
                    noteAmplitude[note] = velocity;
                } else if ((command == ShortMessage.NOTE_OFF) || (command == LOCAL_NOTE_OFF)) {
                    noteAmplitude[note] = 0.0f;
                }
            }
            tickIndex++;
        }

        if (i > 0 && (i % nUpdateDistance == 0)) {
            for (int j = 0; j < waveForm.length; j++) {
                final float noise = (1e-3f * System.nanoTime() % 2); // adds some noise
                waveForm[j] = apodization[j] * getSample(j) + noise / scale;
            }
            decodeFrame(fft, waveForm, data, (frameCounter * frameSize) % data.length);
            frameCounter++;
        }
    }

    // return synthesizer to its original state
    for (int note = 0; note < N_NOTES; note++) {
        noteAmplitude[note] = 0.0f;
        synthesizerChannel.noteOff(note, 0);
    }
}
 

/**
 * chase all events from beginning of Track
 * and send note off for those events that are active
 * in noteOnCache array.
 * It is possible, of course, to catch notes from other tracks,
 * but better than more complicated logic to detect
 * which notes are really from this track
 */
private void sendNoteOffIfOn(Track track, long endTick) {
    int size = track.size();
    int done = 0;
    try {
        for (int i = 0; i < size; i++) {
            MidiEvent event = track.get(i);
            if (event.getTick() > endTick) break;
            MidiMessage msg = event.getMessage();
            int status = msg.getStatus();
            int len = msg.getLength();
            if (len == 3 && ((status & 0xF0) == ShortMessage.NOTE_ON)) {
                int note = -1;
                if (msg instanceof ShortMessage) {
                    ShortMessage smsg = (ShortMessage) msg;
                    if (smsg.getData2() > 0) {
                        // only consider Note On with velocity > 0
                        note = smsg.getData1();
                    }
                } else {
                    byte[] data = msg.getMessage();
                    if ((data[2] & 0x7F) > 0) {
                        // only consider Note On with velocity > 0
                        note = data[1] & 0x7F;
                    }
                }
                if (note >= 0) {
                    int bit = 1<<(status & 0x0F);
                    if ((noteOnCache[note] & bit) != 0) {
                        // the bit is set. Send Note Off
                        getTransmitterList().sendMessage(status | (note<<8), -1);
                        // clear the bit
                        noteOnCache[note] &= (0xFFFF ^ bit);
                        done++;
                    }
                }
            }
        }
    } catch (ArrayIndexOutOfBoundsException aioobe) {
        // this happens when messages are removed
        // from the track while this method executes
    }
}
 

/**
 * chase all events from beginning of Track
 * and send note off for those events that are active
 * in noteOnCache array.
 * It is possible, of course, to catch notes from other tracks,
 * but better than more complicated logic to detect
 * which notes are really from this track
 */
private void sendNoteOffIfOn(Track track, long endTick) {
    int size = track.size();
    int done = 0;
    try {
        for (int i = 0; i < size; i++) {
            MidiEvent event = track.get(i);
            if (event.getTick() > endTick) break;
            MidiMessage msg = event.getMessage();
            int status = msg.getStatus();
            int len = msg.getLength();
            if (len == 3 && ((status & 0xF0) == ShortMessage.NOTE_ON)) {
                int note = -1;
                if (msg instanceof ShortMessage) {
                    ShortMessage smsg = (ShortMessage) msg;
                    if (smsg.getData2() > 0) {
                        // only consider Note On with velocity > 0
                        note = smsg.getData1();
                    }
                } else {
                    byte[] data = msg.getMessage();
                    if ((data[2] & 0x7F) > 0) {
                        // only consider Note On with velocity > 0
                        note = data[1] & 0x7F;
                    }
                }
                if (note >= 0) {
                    int bit = 1<<(status & 0x0F);
                    if ((noteOnCache[note] & bit) != 0) {
                        // the bit is set. Send Note Off
                        getTransmitterList().sendMessage(status | (note<<8), -1);
                        // clear the bit
                        noteOnCache[note] &= (0xFFFF ^ bit);
                        done++;
                    }
                }
            }
        }
    } catch (ArrayIndexOutOfBoundsException aioobe) {
        // this happens when messages are removed
        // from the track while this method executes
    }
    if (DEBUG_PUMP) Printer.println("  sendNoteOffIfOn: sent "+done+" messages.");
}
 

public static double send(Sequence seq, Receiver recv) {
    float divtype = seq.getDivisionType();
    assert (seq.getDivisionType() == Sequence.PPQ);
    Track[] tracks = seq.getTracks();
    int[] trackspos = new int[tracks.length];
    int mpq = 500000;
    int seqres = seq.getResolution();
    long lasttick = 0;
    long curtime = 0;
    while (true) {
        MidiEvent selevent = null;
        int seltrack = -1;
        for (int i = 0; i < tracks.length; i++) {
            int trackpos = trackspos[i];
            Track track = tracks[i];
            if (trackpos < track.size()) {
                MidiEvent event = track.get(trackpos);
                if (selevent == null || event.getTick() < selevent.getTick()) {
                    selevent = event;
                    seltrack = i;
                }
            }
        }
        if (seltrack == -1)
            break;
        trackspos[seltrack]++;
        long tick = selevent.getTick();
        if (divtype == Sequence.PPQ)
            curtime += ((tick - lasttick) * mpq) / seqres;
        else
            curtime = (long) ((tick * 1000000.0 * divtype) / seqres);
        lasttick = tick;
        MidiMessage msg = selevent.getMessage();
        if (msg instanceof MetaMessage) {
            if (divtype == Sequence.PPQ)
                if (((MetaMessage) msg).getType() == 0x51) {
                    byte[] data = ((MetaMessage) msg).getData();
                    mpq = ((data[0] & 0xff) << 16) | ((data[1] & 0xff) << 8) | (data[2] & 0xff);
                }
        } else {
            if (recv != null)
                recv.send(msg, curtime);
        }
    }

    return curtime / 1000000.0;
}