midiplayer.java

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package midiplayer;

import javax.sound.midi.*;
import java.io.*;
import java.net.*;

/**
 * <p>Title: MIDI播放器</p>
 * <p>Description: 使用javax.sound.midi包中的类实现MIDI文件的播放</p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: 北京师范大学计算机系</p>
 * @author 曾文琪
 * @version 1.0
 */


public class MIDIPlayer {

  private static String midiFile = "canyon.mid";
  private static String midiURI = "http://.../canyon.mid";
  private Sequence sequence =null;
  public MIDIPlayer() {
    this.loadAndPlay();
  }
  public void loadAndPlay(){
    try {
        sequence = MidiSystem.getSequence(new File(midiFile));

        // 读网络地址URL中MIDI文件
//        sequence = MidiSystem.getSequence(new URL("http://hostname/midifile"));
        Sequencer sequencer = MidiSystem.getSequencer();
        sequencer.open();
        sequencer.setSequence(sequence);
        double durationInSecs = sequencer.getMicrosecondLength() / 1000000.0;
        System.out.println("the duration of this audio is "+durationInSecs+"secs.");
        double seconds = sequencer.getMicrosecondPosition() / 1000000.0;
        System.out.println("the Position of this audio is "+seconds+"secs.");
        if (sequencer instanceof Synthesizer) {
                Synthesizer synthesizer = (Synthesizer)sequencer;
                MidiChannel[] channels = synthesizer.getChannels();
                double gain = 0.9D;
                for (int i=0; i<channels.length; i++) {
                    channels[i].controlChange(7, (int)(gain * 127.0));
                }
            }

        sequencer.start();

        Thread.currentThread().sleep(5000);
        seconds = sequencer.getMicrosecondPosition() / 1000000.0;
        System.out.println("the Position of this audio is "+seconds+"secs.");
        sequencer.addMetaEventListener(
        new MetaEventListener() {
            public void meta(MetaMessage event) {
                if (event.getType() == 47) {
                    System.out.println("Sequencer is done playing.");
                }
            }
        });
    }catch (MalformedURLException e) {
    }catch (IOException e) {
    }catch (MidiUnavailableException e) {
    }catch (InvalidMidiDataException e) {
    }catch (InterruptedException e){
    }
  }

  public static void main(String[] args) {
    MIDIPlayer midiplayer = new MIDIPlayer();
  }
}