/*
 * UDPCapture.java
 *
 * Created on 2006年5月7日, 下午1:06
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package skyqq;
import javax.sound.sampled.*;
import java.net.*;
/**
 * 抓取聲音并發送
 * @author wjhua
 */
public class UDPCapture implements Runnable{
    TargetDataLine line;
    
    Thread thread;
    DatagramPacket pacToSend;
    DatagramSocket soc;
    
    String ip;
    
    /** Creates a new instance of UDPCapture */
    public UDPCapture(String ip) {
        this.ip=ip;
    }
    public void start() {
        
        thread = new Thread(this);
        thread.setName("udpcapture");
        thread.start();
    }
    
    public void stop() {
        thread = null;
    }
    
    public void run() {
        
        try {
            soc = new DatagramSocket();
            //建立輸出流 此處可以加套壓縮流用來壓縮數據
        } catch (Exception 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);
            //TargetDataLine 接口是DataLine接口的一種，通過它就可以直接從音頻硬件獲取數據了
            line.open(format, line.getBufferSize());
        } catch (Exception ex) {
            return;
        }
        
        byte[] data = new byte[1024];//跟下面的1024應保持一致
        int numbytesread = 0;
        line.start();
        
        while (thread != null) {
            numbytesread = line.read(data, 0, 1024);
           
            try {
                pacToSend = new DatagramPacket(data,data.length,
                        InetAddress.getByName(ip),20001);
                soc.send(pacToSend);//寫入網絡流
            } catch (Exception ex) {
                break;
            }
        }
        
        line.stop();
        line.close();
        line = null;
        
    }
    
}