playback.java

P2P聊天系统 该程序是由NetBeans IDE 6.5

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package voice;

/**
 *
 * @author Administrator
 */
//下面是音频输出的代码：

//Playback.java
import java.io.*;
import javax.sound.sampled.*;
import java.net.*;


public class Playback implements Runnable {

       final int bufSize = 16384;
       SourceDataLine line;
       Thread thread;
       Socket s;

       public Playback(Socket s){//构造器 取得socket以获得网络输入流
         this.s=s;
       }
       public void start() {

           thread = new Thread(this);
           thread.setName("Playback");
           thread.start();
       }

       public void stop() {
           thread = null;
       }

       public void run() {

           AudioFormat format =new AudioFormat(8000,16,2,true,true);//AudioFormat(float sampleRate, int sampleSizeInBits, int channels, boolean signed, boolean bigEndian）
           BufferedInputStream playbackInputStream;

           try {
             playbackInputStream=new BufferedInputStream(new AudioInputStream(s.getInputStream(),format,2147483647));//封装成音频输出流，如果网络流是经过压缩的需在此加套解压流
           }
           catch (IOException ex) {
               return;
           }

           DataLine.Info info = new DataLine.Info(SourceDataLine.class,format);

           try {
               line = (SourceDataLine) AudioSystem.getLine(info);
               line.open(format, bufSize);
           } catch (LineUnavailableException ex) {
               return;
           }

           byte[] data = new byte[1024];//此处数组的大小跟实时性关系不大，可根据情况进行调整
           int numBytesRead = 0;
           line.start();

           while (thread != null) {
              try{
                 numBytesRead = playbackInputStream.read(data);
                 line.write(data, 0,numBytesRead);
              } catch (IOException e) {
                   break;
               }
           }

           if (thread != null) {
               line.drain();
           }

           line.stop();
           line.close();
           line = null;
       }
}