//Playback.java
package com.softfz;
//下面是音頻輸出的代碼：

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


/** 
* Title:        VoiceChat 
* Description:  輸出音頻（放音程序） 
* Copyright:    Copyright (c) 2001 
*/ 


class Playback implements Runnable { 

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

       Playback(Socket s){//構造器 取得socket以獲得網絡輸入流 
         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));//封裝成音頻輸出流，如果網絡流是經過壓縮的需在此加套解壓流 
           } 
           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];//此處數組的大小跟實時性關系不大，可根據情況進行調整 
           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; 
       } 
}

	//Capture.java
package com.softfz;
//音頻捕獲部分，

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

/** 
* Title:        VoiceChat 
* Description:  音頻捕捉（錄音程序） 
* Copyright:    Copyright (c) 2001 
*/ 

class Capture implements Runnable { 

       TargetDataLine line; 
       Thread thread; 
       Socket s; 
       BufferedOutputStream captrueOutputStream; 

       Capture(Socket s){//構造器 取得socket以獲得網絡輸出流 
         this.s=s; 
       } 

       public void start() { 

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

       public void stop() { 
           thread = null; 
       } 

       public void run() { 

           try { 
             captrueOutputStream=new BufferedOutputStream(s.getOutputStream());//建立輸出流 此處可以加套壓縮流用來壓縮數據 
           } 
           catch (IOException ex) { 
               return; 
           } 

           AudioFormat format =new AudioFormat(8000,16,2,true,true);//AudioFormat(float sampleRate, int sampleSizeInBits, int channels, boolean signed, boolean bigEndian） 
           DataLine.Info info = new DataLine.Info(TargetDataLine.class,format); 

           try { 
               line = (TargetDataLine) AudioSystem.getLine(info); 
               line.open(format, line.getBufferSize()); 
           } catch (Exception ex) { 
               return; 
           } 

           byte[] data = new byte[1024];//此處的1024可以情況進行調整，應跟下面的1024應保持一致 
           int numBytesRead=0; 
           line.start(); 

           while (thread != null) { 
               numBytesRead = line.read(data, 0,128);//取數據（1024）的大小直接關系到傳輸的速度，一般越小越快， 
               try { 
                 captrueOutputStream.write(data, 0, numBytesRead);//寫入網絡流 
               } 
               catch (Exception ex) { 
                   break; 
               } 
           } 

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

           try { 
               captrueOutputStream.flush(); 
               captrueOutputStream.close(); 
           } catch (IOException ex) { 
               ex.printStackTrace(); 
           } 
       } 
     
}