midievents | MIDI events parser/encoder | Audio Utils library

private static List midiEventsToNotes(List midiEvents) {
        List output = new ArrayList<>();
        Predicate noteEvent = me -> me.getMessage().getStatus() >> REST_OF_STATUS_BYTE == NOTE_ON
                || me.getMessage().getStatus() >> REST_OF_STATUS_BYTE == NOTE_OFF;
        List noteEvents = midiEvents.stream().filter(noteEvent).collect(Collectors.toList());
        for (int i = 0; i < noteEvents.size(); i++) {
            int eventType = noteEvents.get(i).getMessage().getStatus() >> REST_OF_STATUS_BYTE;
            if (eventType == NOTE_ON) {
                byte pitch = noteEvents.get(i).getMessage().getMessage()[1];
                int startBeat = (int) (noteEvents.get(i).getTick() / ticksPerBeat);
                for (MidiEvent ne: noteEvents) {
                    int pairType =  ne.getMessage().getStatus() >> REST_OF_STATUS_BYTE;
                    byte pitch2 = ne.getMessage().getMessage()[1];
                    if (pairType == NOTE_OFF && pitch == pitch2) {
                        int value = (int) (ne.getTick() / ticksPerBeat - startBeat);
                        int pianoKey = pitch - MIDI_A0_VALUE;
                        output.add(new Note(startBeat, value, pianoKey));
                        break;
                    }
                }
            }
        }
        return output;
    }