pcmplayer.java

用Java编写的一个可下载MP3

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package org.serain.shmily.player;

import java.awt.event.*;
import java.io.*;
import javax.sound.sampled.*;
import javax.swing.*;

/**
 *
 * @author Administrator
 */
public class PcmPlayer {
    Timer timer;
    Clip clip;
    boolean playing=false;
    int audioLength;
    int audioPosition=0;
    public PcmPlayer(File f) throws Exception{
        AudioInputStream ain=AudioSystem.getAudioInputStream(f);    
        try{ 
            AudioFormat format=ain.getFormat();
            DataLine.Info info=new DataLine.Info(Clip.class,format);
            if(!AudioSystem.isLineSupported(info)){
                 AudioFormat pcm=new AudioFormat(format.getSampleRate(), 16,format.getChannels(), true, false);
                 ain=AudioSystem.getAudioInputStream(pcm,ain);
                 format=ain.getFormat();
                 info=new DataLine.Info(Clip.class,format);
                
            }
            clip=(Clip)AudioSystem.getLine(info);
            clip.open(ain);
        }finally{
            ain.close();
        }
        audioLength=(int)(clip.getMicrosecondLength()/1000);
        timer=new Timer(100,new ActionListener(){
            public void actionPerformed(ActionEvent e){
                tick();
            }
        }); 
    }
    public void play(){
        clip.start();
        timer.start();
        playing=true;
    }
    public void stop(){
        timer.stop();
        clip.stop();
        playing=false;
    }
    public void reset(){
        stop();
        clip.setMicrosecondPosition(0);
        audioPosition=0;
        
    }
    public void skip(int position){
        if(position<0||position>audioLength)
            return;
        clip.setMicrosecondPosition(position*1000);
    }
    public int getLength(){
        return audioLength;
    }
    public void tick(){
          if(clip.isActive()){
              audioPosition=(int)(clip.getMicrosecondPosition()/1000);
          }else{
              reset();
          }
    }

    public int getAudioLength() {
        return audioLength;
    }

    public void setAudioLength(int audioLength) {
        this.audioLength = audioLength;
    }

    public int getAudioPosition() {
        return audioPosition;
    }

    public void setAudioPosition(int audioPosition) {
        this.audioPosition = audioPosition;
    }

    public boolean isPlaying() {
        return playing;
    }

    public void setPlaying(boolean playing) {
        this.playing = playing;
    }

    public Timer getTimer() {
        return timer;
    }

    public void setTimer(Timer timer) {
        this.timer = timer;
    }

}