Get frame from MJPEG (Motion Webcams)

gistfile1.java

package com.test;

import java.awt.image.BufferedImage;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;

import javax.imageio.ImageIO;

public class TestMJPG {

	private byte[] curFrame;
	private boolean frameAvailable = false;
	private HttpURLConnection conn;
	private BufferedInputStream httpIn;
	private ByteArrayOutputStream jpgOut;

	public static void main(String[] args) {
		TestMJPG mp = new TestMJPG(args[0], args[1]);
	}

	public TestMJPG(String uri, String outputFilePath) {
		try {
			URL url = new URL(uri);
			conn = (HttpURLConnection) url.openConnection();
			httpIn = new BufferedInputStream(conn.getInputStream(), 8192);

			int prev = 0;
			int cur = 0;

			try {
				while (httpIn != null && (cur = httpIn.read()) >= 0 && !frameAvailable) {
					if (prev == 0xFF && cur == 0xD8) {
						jpgOut = new ByteArrayOutputStream(8192);
						jpgOut.write((byte) prev);
					}
					if (jpgOut != null) {
						jpgOut.write((byte) cur);
					}
					if (prev == 0xFF && cur == 0xD9) {
						curFrame = jpgOut.toByteArray();
						frameAvailable = true;
						jpgOut.close();
					}
					prev = cur;
				}
			} catch (IOException e) {
				System.err.println("I/O Error: " + e.getMessage());
			}

			ByteArrayInputStream jpgIn = new ByteArrayInputStream(curFrame);
			BufferedImage bufImg = ImageIO.read(jpgIn);

			File outputFile = new File(outputFilePath);
			ImageIO.write(bufImg, "jpg", outputFile);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}