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/*

* ReadYUV.java

* By Abdul Arfan

* 20101204005

* can read in color

*/

import java.io.*;

import javax.swing.*;

import java.awt.image.*;

import javax.imageio.*;

import java.util.*;

public class ReadYUV

{

DataInputStream dis;

byte[] oneFrame;

int width;

int height;

String type= "4:2:0";

int oneFrameLength;

public ReadYUV(int width, int height)

{

this.width = width;

this.height = height;

this.type = "4:2:0"; //this version only support the 4:2:0 yuv

}

public void startReading(String filename)

{

try

{

dis = new DataInputStream(new BufferedInputStream(

new FileInputStream(filename)));

double pengali = 1.5;

if (type.equals("4:2:0"))

{

pengali = 1.5;

}

oneFrameLength = (int) (width * height * (pengali));

oneFrame = new byte[oneFrameLength];

}

catch (Exception e)

{

e.printStackTrace();

}

}

public int getRGBFromStream(int x, int y)

{

int arraySize = height * width;

int Y = unsignedByteToInt(oneFrame[y * width + x]);

int U = unsignedByteToInt(oneFrame[(y/2) * (width/2) + x/2 + arraySize]);

int V = unsignedByteToInt(oneFrame[(y/2) * (width/2) + x/2 + arraySize + arraySize/4]);

//~ int R = (int)(Y + 1.370705 * (V-128));

//~ int G = (int)(Y - 0.698001 * (V-128) - 0.337633 * (U-128));

//~ int B = (int)(Y + 1.732446 * (U-128));

int R = (int)(Y + 1.4075 * (V - 128));

int G = (int)(Y - 0.3455 * (U - 128) - (0.7169 * (V - 128)));

int B =(int) (Y + 1.7790 * (U - 128));

if(R>255) R = 255;

if(G>255) G = 255;

if(B>255) B = 255;

if(R<0) R = 0;

if(G<0) G = 0;

if(B<0) B = 0;

int rColor = (0xff << 24) | (R << 16) | (G << 8) | B;

return rColor;

}

public int getGrayScaleFromY(int x, int y)

{

int arraySize = height * width;

int Y = unsignedByteToInt(oneFrame[y * width + x]);

int R = Y;

if(R>255) R = 255;

int G = R;

int B = R;

int rColor = (0xff << 24) | (R << 16) | (G << 8) | B;

return rColor;

}

public BufferedImage nextImage()

{

try

{

int n = dis.read(oneFrame);

if (n != oneFrameLength)

{

return null;

}

BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

for (int j = 0; j < height; j++)

{

for (int i = 0; i < width; i++)

{

int rColor = getRGBFromStream(i, j);

image.setRGB(i, j, rColor);

}

}

//ImageIO.write(image, "png", new File("result.png"));

return image;

}

catch (Exception e)

{

e.printStackTrace();

}

return null;

}

public BufferedImage nextImageYOnly()

{

try

{

int n = dis.read(oneFrame);

if (n != oneFrameLength)

{

return null;

}

BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

for (int j = 0; j < height; j++)

{

for (int i = 0; i < width; i++)

{

int rColor = getGrayScaleFromY(i, j);

image.setRGB(i, j, rColor);

}

}

return image;

}

catch (Exception e)

{

e.printStackTrace();

}

return null;

}

public void endReading()

{

try {

dis.close();

}

catch (IOException ex) {

ex.printStackTrace();

}

}

public static int unsignedByteToInt(byte b)

{

return (int) b & 0xFF;

}

public static void main(String args[]) throws Exception

{

BufferedImage currentImage;

ReadYUV ryuv = new ReadYUV(176, 144); //read the qcif yuv

ryuv.startReading("akiyo_qcif.yuv");

WriteYUV wyuv = new WriteYUV(176, 144);

wyuv.startWriting("test_qcif.yuv");

while((currentImage=ryuv.nextImageYOnly())!=null)

{

wyuv.writeImageYOnly(currentImage);

}

wyuv.endWriting();

ryuv.endReading();

}

}