Question

我有一个Java应用程序，可以在PC的扬声器上生成，然后播放一些简单的单轨MIDI音乐。它在几个版本的Windows上运行得非常好，但我最近在Windows 10上尝试过它并且它失败了：

没有声音播放
它似乎停滞不前（永远不会退出＆＃34; isRunning＆＃34;状态）

代码（我刚刚更新了它，因此它是可测试的，更接近最小的例子）：

import javax.sound.midi.*;


class zik2 {
  static Track track;

  static int VEL=50;
  static int PROG=21; // 19: church organ, 21: harmonica

  static int[] gamme = {60,62,64,65,67,69,71,72,74,76,77,79,81,83,84};

  public static void main(String[] args) {
    try {
      Sequence seq=new Sequence(Sequence.PPQ,1);
      track=seq.createTrack();

      long tick=0;

      ShortMessage sm;
      sm=new ShortMessage();      

      sm.setMessage(ShortMessage.PROGRAM_CHANGE,PROG,0);
      track.add(new MidiEvent(sm,tick));

      for(int k=0; k<7; k++) {
        int l=gamme[k];
        sm.setMessage(ShortMessage.NOTE_ON,0,l,VEL); 
        track.add(new MidiEvent(sm,tick++));
        sm.setMessage(ShortMessage.NOTE_OFF,0,l,0); 
        track.add(new MidiEvent(sm,tick+1));
      }

      Sequencer player=MidiSystem.getSequencer();
      player.open();
      player.setSequence(seq);
      player.setTempoInBPM(60);
      player.start();
      System.out.println("Hello (world)");
      do { Thread.sleep(50); } while(player.isRunning());
      player.close();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
}

更新：以下简短测试有效，所以问题在于音序器？

import javax.sound.midi.*;

public class test {
  public static void main(String[] args)
  {
      try {
          Synthesizer synthesizer = MidiSystem.getSynthesizer();
          synthesizer.open();

          MidiChannel[] channels = synthesizer.getChannels();

          channels[0].noteOn(60, 60);
          Thread.sleep(1000);
          channels[0].noteOff(60);
          Thread.sleep(1000);

          synthesizer.close();
      } catch (Exception e)
      {
          e.printStackTrace();
      }
  }
}

Java应用程序中的Sequencer不能再在Windows上播放MIDI轨道

0 个答案: