Started fixing the video streaming code.

LICENSE.txt

@@ -1,202 +0,0 @@
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src/ve/ucv/ciens/ccg/networkdata/VideoFrameDataMessage.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2013 Miguel Angel Astor Romero
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package ve.ucv.ciens.ccg.networkdata;
+
+import java.io.Serializable;
+
+public final class VideoFrameDataMessage implements Serializable{
+	private static final long serialVersionUID = 9989L;
+	public static final int magicNumber = 0x10;
+
+	public int imageWidth;
+	public int imageHeight;
+	public byte[] data;
+
+	public VideoFrameDataMessage(){
+		imageWidth = -1;
+		imageHeight = -1;
+		data = null;
+	}
+}

src/ve/ucv/ciens/ccg/networkdata/VideoStreamingControlMessage.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2013 Miguel Angel Astor Romero
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package ve.ucv.ciens.ccg.networkdata;
+
+import java.io.Serializable;
+
+public final class VideoStreamingControlMessage implements Serializable{
+	private static final long serialVersionUID = 8898L;
+	public static final int magicNumber = 0x20;
+
+	public byte message;
+
+	public VideoStreamingControlMessage(){
+		message = -1;
+	}
+}

src/ve/ucv/ciens/ccg/nxtar/NxtARCore.java

@@ -20,14 +20,17 @@ import ve.ucv.ciens.ccg.nxtar.interfaces.NetworkConnectionListener;
 import ve.ucv.ciens.ccg.nxtar.interfaces.Toaster;
 import ve.ucv.ciens.ccg.nxtar.network.RobotControlThread;
 import ve.ucv.ciens.ccg.nxtar.network.ServiceDiscoveryThread;
+import ve.ucv.ciens.ccg.nxtar.network.VideoFrameMonitor;
 import ve.ucv.ciens.ccg.nxtar.network.VideoStreamingThread;
 import ve.ucv.ciens.ccg.nxtar.utils.ProjectConstants;
+import ve.ucv.ciens.ccg.nxtar.utils.Size;
 
 import com.badlogic.gdx.Application;
 import com.badlogic.gdx.ApplicationListener;
 import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.graphics.GL10;
 import com.badlogic.gdx.graphics.OrthographicCamera;
+import com.badlogic.gdx.graphics.Pixmap;
 import com.badlogic.gdx.graphics.Texture;
 import com.badlogic.gdx.graphics.Texture.TextureFilter;
 import com.badlogic.gdx.graphics.g2d.Sprite;
@@ -46,6 +49,7 @@ public class NxtARCore implements ApplicationListener, NetworkConnectionListener
 	private MulticastEnabler mcastEnabler;
 	private int connections;
 
+	private VideoFrameMonitor frameMonitor;
 	private ServiceDiscoveryThread udpThread;
 	private VideoStreamingThread videoThread;
 	private RobotControlThread robotThread;
@@ -83,14 +87,16 @@ public class NxtARCore implements ApplicationListener, NetworkConnectionListener
 		sprite.setPosition(-sprite.getWidth()/2, -sprite.getHeight()/2);
 
 		Gdx.app.debug(TAG, CLASS_NAME + ".create() :: Creating network threads");
+		frameMonitor = VideoFrameMonitor.getInstance();
 		mcastEnabler.enableMulticast();
 		udpThread = ServiceDiscoveryThread.getInstance();
 		videoThread = VideoStreamingThread.getInstance().setToaster(toaster);
-		robotThread = RobotControlThread.getInstance().setToaster(toaster);
+		//robotThread = RobotControlThread.getInstance().setToaster(toaster);
 
 		udpThread.start();
 		videoThread.start();
-		robotThread.start();
+		videoThread.startStreaming();
+		//robotThread.start();
 	}
 
 	@Override
@@ -101,13 +107,32 @@ public class NxtARCore implements ApplicationListener, NetworkConnectionListener
 
 	@Override
 	public void render(){
+		byte[] frame;
+		Size dimensions;
+
 		Gdx.gl.glClearColor(1, 1, 1, 1);
 		Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
 
-		batch.setProjectionMatrix(camera.combined);
+		frame = frameMonitor.getCurrentFrame();
-		batch.begin();
+		if(frame != null){
-		sprite.draw(batch);
+			texture.dispose();
-		batch.end();
+
+			dimensions = frameMonitor.getFrameDimensions();
+			texture = new Texture(new Pixmap(frame, 0, dimensions.getWidth() * dimensions.getHeight()));
+			texture.setFilter(TextureFilter.Linear, TextureFilter.Linear);
+
+			TextureRegion region = new TextureRegion(texture, 0, 0, dimensions.getWidth(), dimensions.getHeight());
+
+			sprite = new Sprite(region);
+			sprite.setSize(0.9f, 0.9f * sprite.getHeight() / sprite.getWidth());
+			sprite.setOrigin(sprite.getWidth()/2, sprite.getHeight()/2);
+			sprite.setPosition(-sprite.getWidth()/2, -sprite.getHeight()/2);
+
+			batch.setProjectionMatrix(camera.combined);
+			batch.begin();{
+				sprite.draw(batch);
+			}batch.end();
+		}
 	}
 
 	@Override

src/ve/ucv/ciens/ccg/nxtar/network/VideoFrameMonitor.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2013 Miguel Angel Astor Romero
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package ve.ucv.ciens.ccg.nxtar.network;
+
+import ve.ucv.ciens.ccg.nxtar.utils.Size;
+
+import com.badlogic.gdx.Gdx;
+
+public class VideoFrameMonitor{
+	private final String TAG = "VIDEO_FRAME_MONITOR";
+	private final String CLASS_NAME = VideoFrameMonitor.class.getSimpleName();
+
+	private byte[] frameA;
+	private byte[] frameB;
+	private Object frameMonitor;
+	private Size frameDimensions;
+
+	private VideoFrameMonitor(){
+		frameA = null;
+		frameB = null;
+		frameMonitor = new Object();
+		frameDimensions = new Size();
+	}
+
+	private static class SingletonHolder{
+		public static final VideoFrameMonitor INSTANCE = new VideoFrameMonitor();
+	}
+
+	public static VideoFrameMonitor getInstance(){
+		return SingletonHolder.INSTANCE;
+	}
+
+	public void setFrameDimensions(int width, int height){
+		try{
+			frameDimensions.setWidth(width);
+			frameDimensions.setHeight(height);
+		}catch(IllegalArgumentException ia){
+			Gdx.app.debug(TAG, CLASS_NAME + ".setFrameDimensions() :: Bad argument to Size: " + ia.getMessage());
+			frameDimensions.setWidth(0);
+			frameDimensions.setHeight(0);
+		}
+	}
+
+	public Size getFrameDimensions(){
+		return frameDimensions;
+	}
+
+	public void setNewFrame(byte[] frame){
+		byte[] temp;
+
+		Gdx.app.debug(TAG, CLASS_NAME + ".setNewFrame() :: Loading new frame in frameA.");
+		frameA = frame;
+		synchronized(frameMonitor){
+			Gdx.app.debug(TAG, CLASS_NAME + ".setNewFrame() :: Swapping frameA and frameB.");
+			temp = frameA;
+			frameA = frameB;
+			frameB = temp;
+			Gdx.app.debug(TAG, CLASS_NAME + ".setNewFrame() :: Swapping done.");
+		}
+	}
+
+	public byte[] getCurrentFrame(){
+		byte[] frame;
+
+		synchronized(frameMonitor){
+			//Gdx.app.debug(TAG, CLASS_NAME + ".getCurrentFrame() :: Fetching frameB.");
+			frame = frameB;
+		}
+		return frame;
+	}
+}

src/ve/ucv/ciens/ccg/nxtar/network/VideoStreamingThread.java

@@ -16,11 +16,16 @@
 package ve.ucv.ciens.ccg.nxtar.network;
 
 import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
 import java.net.ServerSocket;
 import java.net.Socket;
 
+import ve.ucv.ciens.ccg.networkdata.VideoFrameDataMessage;
+import ve.ucv.ciens.ccg.networkdata.VideoStreamingControlMessage;
 import ve.ucv.ciens.ccg.nxtar.interfaces.NetworkConnectionListener;
 import ve.ucv.ciens.ccg.nxtar.interfaces.Toaster;
+import ve.ucv.ciens.ccg.nxtar.network.protocols.VideoStreamingProtocol;
 import ve.ucv.ciens.ccg.nxtar.utils.ProjectConstants;
 
 import com.badlogic.gdx.Gdx;
@@ -30,15 +35,35 @@ public class VideoStreamingThread extends Thread {
 	private static final String TAG = "NXTAR_CORE_VIDEOTHREAD";
 	private static final String CLASS_NAME = VideoStreamingThread.class.getSimpleName();
 
+	private enum ProtocolState_t {WAIT_FOR_START, SEND_CONTINUE, RECEIVE_DATA, SEND_ACK_NEXT, SEND_ACK_WAIT, PAUSED, END_STREAM};
+
 	private NetworkConnectionListener netListener;
 	private ServerSocket server;
-	private Socket client;
 	private Toaster toaster;
+	private ProtocolState_t protocolState;
+	private boolean protocolStarted;
+	private boolean pauseProtocol;
+	private boolean endProtocol;
+	private boolean done;
+	private Object protocolPauseMonitor;
+	private Socket client;
+	private ObjectInputStream reader;
+	private ObjectOutputStream writer;
+	private VideoFrameMonitor frameMonitor;
 
 	private VideoStreamingThread(){
 		super(THREAD_NAME);
 
 		netListener = null;
+		toaster = null;
+		protocolStarted = false;
+		endProtocol = false;
+		pauseProtocol = false;
+		done = false;
+		protocolState = ProtocolState_t.WAIT_FOR_START;
+		protocolPauseMonitor = new Object();
+		frameMonitor = VideoFrameMonitor.getInstance();
+
 		try{
 			server = new ServerSocket(ProjectConstants.SERVER_TCP_PORT_1);
 		}catch(IOException io){
@@ -63,16 +88,278 @@ public class VideoStreamingThread extends Thread {
 		netListener = listener;
 	}
 
-	@Override
+	private void toast(String message){
-	public void run(){
+		if(toaster != null)
-		try{
+			toaster.showShortToast(message);
-			client = server.accept();
+	}
-			if(netListener != null)
+
-				netListener.networkStreamConnected(THREAD_NAME);
+	public void startStreaming(){
-			toaster.showShortToast("Client connected to VideoStreamingThread");
+		if(!protocolStarted){
-			client.close();
+			Gdx.app.debug(TAG, CLASS_NAME + ".startStreaming() :: Requesting protocol start.");
-		}catch(IOException io){
+			synchronized(protocolPauseMonitor){
-			Gdx.app.error(TAG, CLASS_NAME + ".run() :: Error accepting client: " + io.getMessage(), io);
+				protocolStarted = true;
+				protocolState = ProtocolState_t.SEND_CONTINUE;
+				protocolPauseMonitor.notifyAll();
+			}
 		}
 	}
+
+	public void pauseStreaming(){
+		if(protocolStarted){
+			Gdx.app.debug(TAG, CLASS_NAME + ".pauseStreaming() :: Requesting protocol pause.");
+			pauseProtocol = true;
+		}else
+			return;
+	}
+
+	public void resumeStreaming(){
+		if(protocolStarted){
+			Gdx.app.debug(TAG, CLASS_NAME + ".resumeStreaming() :: Requesting protocol resume.");
+			synchronized(protocolPauseMonitor){
+				pauseProtocol = false;
+				protocolPauseMonitor.notifyAll();
+			}
+		}else
+			return;
+	}
+
+	public void finishStreaming(){
+		if(protocolStarted){
+			Gdx.app.debug(TAG, CLASS_NAME + ".finishStreaming() :: Requesting protocol end.");
+			endProtocol = true;
+		}else
+			return;
+	}
+
+	public void finish(){
+		done = true;
+	}
+
+	/*@Override
+	public void run(){
+		Object tmpMessage;
+		VideoStreamingControlMessage controlMessage;
+		VideoFrameDataMessage dataMessage;
+
+		// Listen on the server socket until a client successfully connects.
+		do{
+			try{
+				Gdx.app.debug(TAG, CLASS_NAME + ".run() :: Listening for client.");
+				client = server.accept();
+				if(netListener != null)
+					netListener.networkStreamConnected(THREAD_NAME);
+				writer = new ObjectOutputStream(client.getOutputStream());
+				reader = new ObjectInputStream(client.getInputStream());
+				toast("Client connected");
+			}catch(IOException io){
+				Gdx.app.error(TAG, CLASS_NAME + ".run() :: Error accepting client: " + io.getMessage(), io);
+				client = null;
+			}
+		}while(client != null && !client.isConnected());
+
+		while(!done){
+			switch(protocolState){
+			case WAIT_FOR_START:
+				Gdx.app.debug(TAG, CLASS_NAME + ".run() :: State is WAIT_FOR_START.");
+				// If the app has not started the protocol then wait.
+				synchronized(protocolPauseMonitor){
+					while(!protocolStarted){
+						try{
+							Gdx.app.debug(TAG, CLASS_NAME + ".run() :: Protocol has not started, waiting.");
+							protocolPauseMonitor.wait();
+						}catch(InterruptedException ie){ }
+					}
+				}
+				break;
+
+			case SEND_CONTINUE:
+				Gdx.app.debug(TAG, CLASS_NAME + ".run() :: State is SEND_CONTINUE.");
+				// Prepare the message.
+				controlMessage = new VideoStreamingControlMessage();
+				if(!endProtocol){
+					Gdx.app.debug(TAG, CLASS_NAME + ".run() :: Preparing STREAM_CONTROL_END message.");
+					controlMessage.message = VideoStreamingProtocol.STREAM_CONTROL_END;
+				}else{
+					Gdx.app.debug(TAG, CLASS_NAME + ".run() :: Preparing FLOW_CONTROL_CONTINUE message.");
+					controlMessage.message = VideoStreamingProtocol.FLOW_CONTROL_CONTINUE;
+				}
+
+				// Send it!
+				try{
+					writer.writeObject(controlMessage);
+				}catch(IOException io){
+					Gdx.app.error(TAG, CLASS_NAME + ".run() :: Error sending message: " + io.getMessage(), io);
+				}finally{
+					protocolState = ProtocolState_t.RECEIVE_DATA;
+				}
+				break;
+
+			case RECEIVE_DATA:
+				Gdx.app.debug(TAG, CLASS_NAME + ".run() :: State is RECEIVE_DATA.");
+
+				try{
+					tmpMessage = reader.readObject();
+				}catch(IOException io){
+					Gdx.app.error(TAG, CLASS_NAME + ".run() :: IOException while receiving message: " + io.getMessage(), io);
+					break;
+				}catch(ClassNotFoundException cn){
+					Gdx.app.error(TAG, CLASS_NAME + ".run() :: ClassNotFoundException while receiving message: " + cn.getMessage(), cn);
+					break;
+				}
+
+				if(tmpMessage instanceof VideoStreamingControlMessage){
+					Gdx.app.debug(TAG, CLASS_NAME + ".run() :: Received a control message.");
+					controlMessage = (VideoStreamingControlMessage) tmpMessage;
+					// TODO: handle this case correctly.
+
+				}else if(tmpMessage instanceof VideoFrameDataMessage){
+					Gdx.app.debug(TAG, CLASS_NAME + ".run() :: Received a data message.");
+					dataMessage = (VideoFrameDataMessage) tmpMessage;
+
+					Gdx.app.debug(TAG, CLASS_NAME + ".run() :: Received frame dimensions are: " +
+							Integer.toString(dataMessage.imageWidth) + "x" + Integer.toString(dataMessage.imageHeight));
+					frameMonitor.setFrameDimensions(dataMessage.imageWidth, dataMessage.imageHeight);
+					frameMonitor.setNewFrame(dataMessage.data);
+
+					if(pauseProtocol)
+						protocolState = ProtocolState_t.SEND_ACK_WAIT;
+					else
+						protocolState = ProtocolState_t.SEND_ACK_NEXT;
+
+				}else{
+					Gdx.app.error(TAG, CLASS_NAME + ".run() :: Unrecognized message received!.");
+					// TODO: handle this case correctly.
+					System.exit(ProjectConstants.EXIT_FAILURE);
+				}
+
+				break;
+
+			case SEND_ACK_NEXT:
+				Gdx.app.debug(TAG, CLASS_NAME + ".run() :: State is SEND_ACK_NEXT.");
+				// Prepare the message.
+				controlMessage = new VideoStreamingControlMessage();
+				if(!endProtocol){
+					Gdx.app.debug(TAG, CLASS_NAME + ".run() :: Preparing STREAM_CONTROL_END message.");
+					controlMessage.message = VideoStreamingProtocol.STREAM_CONTROL_END;
+				}else{
+					Gdx.app.debug(TAG, CLASS_NAME + ".run() :: Preparing ACK_SEND_NEXT message.");
+					controlMessage.message = VideoStreamingProtocol.ACK_SEND_NEXT;
+				}
+
+				// Send it!
+				try{
+					writer.writeObject(controlMessage);
+				}catch(IOException io){
+					Gdx.app.error(TAG, CLASS_NAME + ".run() :: Error sending message: " + io.getMessage(), io);
+				}finally{
+					if(!endProtocol)
+						protocolState = ProtocolState_t.RECEIVE_DATA;
+					else
+						protocolState = ProtocolState_t.END_STREAM;
+				}
+				break;
+
+			case SEND_ACK_WAIT:
+				Gdx.app.debug(TAG, CLASS_NAME + ".run() :: State is SEND_ACK_WAIT.");
+				// Prepare the message.
+				controlMessage = new VideoStreamingControlMessage();
+				controlMessage.message = VideoStreamingProtocol.ACK_WAIT;
+
+				// Send it!
+				try{
+					writer.writeObject(controlMessage);
+				}catch(IOException io){
+					Gdx.app.error(TAG, CLASS_NAME + ".run() :: Error sending message: " + io.getMessage(), io);
+				}finally{
+					protocolState = ProtocolState_t.PAUSED;
+				}
+				break;
+
+			case PAUSED:
+				Gdx.app.debug(TAG, CLASS_NAME + ".run() :: State is PAUSED.");
+				// The app requested to stop the protocol temporarily.
+				synchronized(protocolPauseMonitor){
+					while(pauseProtocol){
+						try{
+							Gdx.app.debug(TAG, CLASS_NAME + ".run() :: Protocol pause requested, waiting.");
+							protocolPauseMonitor.wait();
+						}catch(InterruptedException ie){ }
+					}
+				}
+				protocolState = ProtocolState_t.SEND_CONTINUE;
+				break;
+
+			case END_STREAM:
+				Gdx.app.debug(TAG, CLASS_NAME + ".run() :: State is END_STREAM.");
+				// Simply disconnect from the client and end the thread.
+				try{
+					client.close();
+				}catch(IOException io){
+					Gdx.app.error(TAG, CLASS_NAME + ".run() :: Error closing client: " + io.getMessage(), io);
+				}
+				done = true;
+				break;
+			}
+		}
+		Gdx.app.debug(TAG, CLASS_NAME + ".run() :: Thread finished.");
+	}*/
+
+	private void receiveImage(){
+		Object tmpMessage;
+		VideoFrameDataMessage dataMessage;
+
+		Gdx.app.debug(TAG, CLASS_NAME + ".run() :: Receiving data.");
+
+		try{
+			tmpMessage = (VideoFrameDataMessage)reader.readObject();
+		}catch(IOException io){
+			Gdx.app.error(TAG, CLASS_NAME + ".run() :: IOException while receiving message: " + io.getMessage());
+			return;
+		}catch(ClassNotFoundException cn){
+			Gdx.app.error(TAG, CLASS_NAME + ".run() :: ClassNotFoundException while receiving message: " + cn.getMessage());
+			return;
+		}
+
+		if(tmpMessage instanceof VideoFrameDataMessage){
+			Gdx.app.debug(TAG, CLASS_NAME + ".run() :: Received a data message.");
+			dataMessage = (VideoFrameDataMessage) tmpMessage;
+			frameMonitor.setFrameDimensions(dataMessage.imageWidth, dataMessage.imageHeight);
+			frameMonitor.setNewFrame(dataMessage.data);
+
+		}else{
+			Gdx.app.debug(TAG, CLASS_NAME + ".run() :: Received something unknown.");
+		}
+	}
+
+	@Override
+	public void run(){
+		// Listen on the server socket until a client successfully connects.
+		do{
+			try{
+				Gdx.app.debug(TAG, CLASS_NAME + ".run() :: Listening for client.");
+				client = server.accept();
+				if(netListener != null)
+					netListener.networkStreamConnected(THREAD_NAME);
+				writer = new ObjectOutputStream(client.getOutputStream());
+				reader = new ObjectInputStream(client.getInputStream());
+				toast("Client connected");
+			}catch(IOException io){
+				Gdx.app.error(TAG, CLASS_NAME + ".run() :: Error accepting client: " + io.getMessage(), io);
+				client = null;
+			}
+		}while(client != null && !client.isConnected());
+
+		while(!done){
+			receiveImage();
+		}
+
+		try{
+			client.close();
+		}catch(IOException io){
+			Gdx.app.error(TAG, CLASS_NAME + ".run() :: Error closing client socket.", io);
+		}
+
+		Gdx.app.debug(TAG, CLASS_NAME + ".run() :: Thread finished.");
+	}
+
 }

src/ve/ucv/ciens/ccg/nxtar/network/protocols/VideoStreamingProtocol.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2013 Miguel Angel Astor Romero
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package ve.ucv.ciens.ccg.nxtar.network.protocols;
+
+public final class VideoStreamingProtocol{
+	public static final byte STREAM_CONTROL_END = 0x10;
+	public static final byte ACK_SEND_NEXT = 0x20;
+	public static final byte ACK_WAIT = 0x30;
+	public static final byte FLOW_CONTROL_WAIT = 0x40;
+	public static final byte FLOW_CONTROL_CONTINUE = 0x50;
+	public static final byte IMAGE_DATA = 0x60;
+	public static final byte UNRECOGNIZED = (byte)0xFF;
+
+	public static boolean checkValidityOfMessage(byte message){
+		boolean validity;
+
+		switch(message){
+		case STREAM_CONTROL_END:
+		case ACK_SEND_NEXT:
+		case ACK_WAIT:
+		case FLOW_CONTROL_WAIT:
+		case FLOW_CONTROL_CONTINUE:
+		case IMAGE_DATA:
+		case UNRECOGNIZED:
+			validity = true;
+			break;
+		default:
+			validity = false;
+		}
+
+		return validity;
+	}
+}

src/ve/ucv/ciens/ccg/nxtar/utils/Size.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2013 Miguel Angel Astor Romero
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package ve.ucv.ciens.ccg.nxtar.utils;
+
+public class Size {
+	private int width;
+	private int height;
+
+	public Size(){
+		width = 0;
+		height = 0;
+	}
+
+	public Size(int width, int height){
+		this.width = (width >= 0) ? width : -1 * width;
+		this.height = (height >= 0) ? height : -1 * height;
+	}
+
+	public int getWidth(){
+		return width;
+	}
+
+	public int getHeight(){
+		return height;
+	}
+
+	public void setWidth(int width) throws IllegalArgumentException{
+		if(width < 0)
+			throw new IllegalArgumentException("Width must not be less than cero.");
+		this.width = width;
+	}
+
+	public void setHeight(int height) throws IllegalArgumentException{
+		if(height < 0)
+			throw new IllegalArgumentException("Height must not be less than cero.");
+		this.height = height;
+	}
+}