comparison MidiPlayer.java @ 22:5c54f5213f3d

This is a fix for the problem where some MIDI files cannot be read because they encode OFF signals as ON signals with a velocity of 0.

 import javax.sound.midi.MidiMessage;
 import javax.sound.midi.ShortMessage;
 import javax.sound.midi.MetaMessage;
 import javax.sound.midi.SysexMessage;
 import javax.sound.midi.MetaMessage;
-
+import java.util.Arrays;
 public class MidiPlayer { 
 
     /* variables */ 
     private Sequencer   sequencer = null;
     private Synthesizer synthesizer = null;

                 if (message instanceof ShortMessage && 
                     ((ShortMessage)message).getCommand() == ShortMessage.NOTE_ON) {
 //                               System.out.println("onset in ticks = " + event.getTick()+ 
 //                                                  "; onset in microseconds = " + 
 //                                                  ticksToMicroseconds(event.getTick()));
-                              ons.add(ticksToMicroseconds(event.getTick()));
+                              //if the event does not have a velocity of zero (i.e. switching a note off)
+                              if(message.getMessage()[2] != 0) {
+                                 ons.add(ticksToMicroseconds(event.getTick())); //THEN we can add the note
+                              }
                 }
             }
         } 
         return ons; 
     }

                     //                   "; microsecondsPerTick = " + microsecondsPerTick +
                     //                   "; offset in microseconds = " + 
                     //                   (float)event.getTick() * microsecondsPerTick);
                     offs.add(ticksToMicroseconds(event.getTick()));
                 }
+                //if we have not found a note off,
+                else if (message instanceof ShortMessage 
+                        && ((ShortMessage)message).getCommand() == ShortMessage.NOTE_ON
+                        && message.getMessage()[2] == 0) { //but it is a note on with a velocity of zero
+                        offs.add(ticksToMicroseconds(event.getTick())); //add it as an off signal
+                }
+                
             }
         }
         return offs; 
     }