程序不产生 Midi 声音

Question

我一直在阅读 Head First Java，这是练习制作音序器和播放 midi 的代码。事情是我没有听到我通过帖子搜索的任何内容，我听说我得到并放置了一个 soundbank.gm 文件，但仍然没有任何内容。无法判断这是我的代码还是我的 PC，因为这本书还没有达到解释所有这些功能的地步。

import javax.sound.midi.*;
public class MiniMiniMusicApp {
    public static void main(String[] args){
        MiniMiniMusicApp  mini = new MiniMiniMusicApp();
        mini.play();
    }

    public void play(){
        try{
            Sequencer player = MidiSystem.getSequencer(); //get a sequencer
            player.open(); //open it
            Sequence seq = new Sequence(Sequence.PPQ, 4);
            Track track = seq.createTrack(); //ask the sequence for a track;
            ShortMessage b = new ShortMessage(); //Put some midi events into the Track.
            b.setMessage(128,1,44,100);
            MidiEvent noteOff = new MidiEvent(b, 16);
            track.add(noteOff);
            player.setSequence(seq); //give the Sequence to the sequencer
            player.start(); // press play.
            Thread.sleep(2000);
            player.close();
        }catch(Exception ex){
            ex.printStackTrace();
        }
    }
}

Answer 1

您缺少 note_on。例如：

ShortMessage b = new ShortMessage(); 
b.setMessage(144, 0, 60, 127);
MidiEvent noteOn = new MidiEvent(b, 2);
track.add(noteOn);

// Here's your note_off
ShortMessage b1 = new ShortMessage(); 
b1.setMessage(128, 1, 44, 100);
MidiEvent noteOff = new MidiEvent(b1, 16);
track.add(noteOff);

程序不产生 Midi 声音

Program not producing Midi sound

java

midi