原来做的一个UDP语音聊天软件,用speex语音库.实现简单的IP连接聊天，效果一般，供学习用。 简单说下UDP协议。 UDP 是User Datagram Protocol的简称， 中文名是用户数据报协议，是OSI（Open System Interconnection，开放式系统互联） 参考模型中一种无连接的传输层协议，提供面向事务的简单不可靠信息传送服务，IETF RFC 768是UDP的正式规范。UDP在IP报文的协议号是17。 UDP协议全称是用户数据报协议[1] ，在网络中它与TCP协议一样用于处理数据包，是一种无连接的协议。在OSI模型中，在第四层——传输层，处于IP协议的上一层。UDP有不提供数据包分组、组装和不能对数据包进行排序的缺点，也就是说，当报文发送之后，是无法得知其是否安全完整到达的。UDP用来支持那些需要在计算机之间传输数据的网络应用。包括网络视频会议系统在内的众多的客户/服务器模式的网络应用都需要使用UDP协议。UDP协议从问世至今已经被使用了很多年，虽然其最初的光彩已经被一些类似协议所掩盖，但是即使是在今天UDP仍然不失为一项非常实用和可行的网络传输层协议。 与所熟知的TCP（传输控制协议）协议一样，UDP协议直接位于IP（网际协议）协议的顶层。根据OSI（开放系统互连）参考模型，UDP和TCP都属于传输层协议。UDP协议的主要作用是将网络数据流量压缩成数据包的形式。一个典型的数据包就是一个二进制数据的传输单位。每一个数据包的前8个字节用来包含报头信息，剩余字节则用来包含具体的传输数据。

package com.lee.call.work;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
public class UDPReceiver {
	protected DatagramPacket dgp;
	protected DatagramSocket ds;
	public UDPReceiver(byte[] data) {
		try {
			ds = new DatagramSocket(9527);
			dgp = new DatagramPacket(data, data.length);
		} catch (SocketException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	public void receive() {
		try {
			ds.receive(dgp);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

package com.lee.call.work;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
public class UDPSender {
	protected DatagramPacket dgp;
	protected DatagramSocket ds;
	protected UDPSender(String ip, byte[] data) {
		try {
			ds = new DatagramSocket();
			dgp = new DatagramPacket(data, data.length,
					InetAddress.getByName(ip), 9527);
		} catch (SocketException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (UnknownHostException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	public void send() {
		// TODO Auto-generated method stub
		try {
			ds.send(dgp);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

package com.lee.call.work;
import android.media.AudioManager;
import android.media.AudioTrack;
import com.lee.speex.jni.Speex;
public class Player implements Runnable {
	private AudioTrack track;
	private UDPReceiver receiver;
	private short[] pcmFrame = new short[AudioParam.FRAME_SIZE];
	private byte[] encodedFrame = new byte[AudioParam.getDefaultQuality()];
	private boolean running;
	protected Player() {
		// TODO Auto-generated constructor stub
		receiver = new UDPReceiver(encodedFrame);
		int trackBufferSize = AudioTrack.getMinBufferSize(
				AudioParam.sampleRateInHz, AudioParam.channelOutConfig,
				AudioParam.audioFormat);
		track = new AudioTrack(AudioManager.STREAM_MUSIC,
				AudioParam.sampleRateInHz, AudioParam.channelOutConfig,
				AudioParam.audioFormat, trackBufferSize, AudioTrack.MODE_STREAM);
		new Thread(this).start();
	}
	@Override
	public void run() {
		// TODO Auto-generated method stub
		running = true;
		track.play();
		while (running) {
			receiver.receive();
			Speex.decode(encodedFrame, pcmFrame, encodedFrame.length);
			track.write(pcmFrame, 0, AudioParam.FRAME_SIZE);
		}
		track.stop();
	}
	public boolean isRunning() {
		return running;
	}
	public void setRunning(boolean running) {
		this.running = running;
	}
}

package com.lee.call.work;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import com.lee.speex.jni.Speex;
public class Recorder implements Runnable {
	private AudioRecord recorder;
	private short[] pcmFrame = new short[AudioParam.FRAME_SIZE];
	private byte[] encodedFrame = new byte[AudioParam.getDefaultQuality()];
	private UDPSender sender;
	private boolean running;
	protected Recorder(String ip) {
		// TODO Auto-generated constructor stub
		sender = new UDPSender(ip, encodedFrame);
		int recordBufferSize = AudioRecord.getMinBufferSize(
				AudioParam.sampleRateInHz, AudioParam.channelInConfig,
				AudioParam.audioFormat);
		recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,
				AudioParam.sampleRateInHz, AudioParam.channelInConfig,
				AudioParam.audioFormat, recordBufferSize);
		new Thread(this).start();
	}
	@Override
	public void run() {
		// TODO Auto-generated method stub
		running = true;
		recorder.startRecording();
		while (running) {
			recorder.read(pcmFrame, 0, AudioParam.FRAME_SIZE);
			Speex.encode(pcmFrame, encodedFrame);
			sender.send();
		}
		recorder.stop();
	}
	public boolean isRunning() {
		return running;
	}
	public void setRunning(boolean running) {
		this.running = running;
	}
}

package com.lee.call.work;
import android.media.AudioFormat;
public class AudioParam {
	/*
	 * quality 1 : 4kbps (very noticeable artifacts, usually intelligible) 2 :
	 * 6kbps (very noticeable artifacts, good intelligibility) 4 : 8kbps
	 * (noticeable artifacts sometimes) 6 : 11kpbs (artifacts usually only
	 * noticeable with headphones) 8 : 15kbps (artifacts not usually noticeable)
	 */
	public static final int QUALITY = 10;
	public static final int HZ_8000 = 8000;
	public static final int HZ_11025 = 11025;
	public static final int HZ_22050 = 22050;
	public static final int HZ_44100 = 44100;
	public static final int sampleRateInHz = HZ_8000;
	public static final int FRAME_SIZE = 160;
	public static final int FRAME_SIZE_IN_SHORTS = FRAME_SIZE;
	public static final int FRAME_SIZE_IN_BYTES = FRAME_SIZE << 1;
	public static final int channelInConfig = AudioFormat.CHANNEL_CONFIGURATION_MONO;
	public static final int channelOutConfig = AudioFormat.CHANNEL_CONFIGURATION_MONO;
	public static final int audioFormat = AudioFormat.ENCODING_PCM_16BIT;
	public static boolean testlocal = true;
	public static boolean uselib = true;
	private static final int[] encodedSizes = { 6, 10, 15, 20, 20, 28, 28, 38,
			38, 46, 62 };
	public static int getDefaultQuality() {
		return encodedSizes[QUALITY];
	}
}

部分代码贴出，工程点下面的链接。
iCall

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