code: /*
   * Computoser is a music-composition algorithm and a website to present the results
   * Copyright (C) 2012-2014  Bozhidar Bozhanov
   *
   * Computoser is free software: you can redistribute it and/or modify
   * it under the terms of the GNU Affero General Public License as
   * published by the Free Software Foundation, either version 3 of the
   * License, or (at your option) any later version.
   *
   * Computoser is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU Affero General Public License for more details.
   *
   * You should have received a copy of the GNU Affero General Public License
   * along with Computoser.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  package com.music.tools;
  
  import java.util.Hashtable;
  import java.util.Iterator;
  import java.util.LinkedList;
  import java.util.Map.Entry;
  
  import jm.constants.Scales;
  import jm.music.data.Note;
  import jm.music.data.Part;
  import jm.music.data.Score;
  import jm.music.tools.PhraseAnalysis;
  import jm.util.Play;
  import jm.util.Read;
  
  import com.google.common.collect.HashMultiset;
  import com.google.common.collect.Multiset;
  
  public class MidiAnalyzer {
  
      public static void main(String[] args) {
          Score score = new Score();
          Read.midi(score, "C:\\workspace\\music\\analysis\\midi\\jarre\\EQUINOX3.MID");
          for (Part part : score.getPartArray()) {
              System.out.println(part.getTitle() + " : " + part.getInstrument());
          }
          Part part = score.getPart(1);
  
          System.out.println(part.getInstrument());
          part.setTempo(160);
          int previousPitch = 0;
          int prePreviousPitch = 0;
          System.out.println(score.getTimeSignature());
          Multiset<Integer> uniqueIntervals = HashMultiset.create();
          int directionChanges = 0;
          int directionRetentions = 0;
  
          LinkedList<Double> noteLengths = new LinkedList<>();
          for (Note note : part.getPhrase(0).getNoteArray()) {
              System.out.println(note.getPitch());
              if (!note.isRest()) {
                  if (prePreviousPitch != 0) {
                      int previousDiff = previousPitch - prePreviousPitch;
                      int diff = note.getPitch() - previousPitch;
                      if (Math.signum(previousDiff) != Math.signum(diff) && diff != 0 && previousDiff != 0) {
                          directionChanges++;
                          System.out.println(prePreviousPitch + ":" + previousPitch + ":" + note.getPitch());
                      } else if (diff != 0 && previousDiff != 0) {
                          directionRetentions++;
                      }
                  }
                  if (note.getPitch() - previousPitch != 0) {
                      prePreviousPitch = previousPitch;
                  }
  
                  uniqueIntervals.add(previousPitch - note.getPitch());
                  previousPitch = note.getPitch();
              }
              noteLengths.add(note.getRhythmValue());
          }
  
          double normalizedBeatSize = 1d * score.getNumerator() * 4 / score.getDenominator();
          System.out.println("Beat size: " + normalizedBeatSize);
          double currentBeatSize = 0;
          int beats = 0;
          int beatsWithPerfectHalves = 0;
          // reverse, to avoid off-beats
          for (Iterator<Double> it = noteLengths.descendingIterator(); it.hasNext();) {
              currentBeatSize += it.next();;
              if (currentBeatSize >= normalizedBeatSize) {
                  currentBeatSize = 0;
                  beats++;
              }
              if (currentBeatSize == normalizedBeatSize / 2) {
                  beatsWithPerfectHalves++;
              }
          }
  
          System.out.println("Beats:beats with perfect halves -- " + beats + ":" + beatsWithPerfectHalves);
  
          Hashtable<String, Object> table = PhraseAnalysis.getAllStatistics(score.getPart(1).getPhrase(0), 1, 0, Scales.MAJOR_SCALE);
          for (Entry<String, Object> entry : table.entrySet()) {
              System.out.println(entry.getKey() + "=" + entry.getValue());
          }
          for (Integer interval : uniqueIntervals.elementSet()) {
              System.out.println(interval + " : " + uniqueIntervals.count(interval));
          }
  
          System.out.println("---");
  
          System.out.println(directionChanges + " : " + directionRetentions);
          Play.midi(part);
      }
  }
  