WebSocket transport example

webcam-capture-drivers/driver-ipcam/pom.xml

@@ -18,7 +18,6 @@
 		<dependency>
 			<groupId>junit</groupId>
 			<artifactId>junit</artifactId>
-			<version>4.11</version>
 			<scope>test</scope>
 		</dependency>
 		<!-- uncomment to debug wire log from httpclient -->

webcam-capture-drivers/driver-ipcam/src/examples/java/JpegDasdingStudioExample.java

@@ -11,7 +11,6 @@
 import com.github.sarxos.webcam.WebcamPanel;
 import com.github.sarxos.webcam.ds.ipcam.IpCamDriver;
 import com.github.sarxos.webcam.ds.ipcam.IpCamStorage;
-import com.github.sarxos.webcam.log.WebcamLogConfigurator;
 
 
 /**
@@ -41,8 +40,6 @@ public class JpegDasdingStudioExample {
 
 	public static void main(String[] args) throws MalformedURLException {
 
-		WebcamLogConfigurator.configure("src/examples/resources/cameras.xml");
-
 		JFrame f = new JFrame("Dasding Studio Live IP Cameras Demo");
 		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 		f.setLayout(new GridLayout(0, 3, 1, 1));

webcam-capture-examples/pom.xml

@@ -30,6 +30,7 @@
 		<module>webcam-capture-swt-awt</module>
 		<module>webcam-capture-video-recording</module>
 		<module>webcam-capture-onejar</module>
+                <module>webcam-capture-websockets</module>
 	</modules>
 
 	<build>

webcam-capture-examples/webcam-capture-websockets/README.md

@@ -0,0 +1,19 @@
+# Webcam WebSockets Example
+
+This example demonstrates how images feed can be transported over the WebSocket. 
+
+## What Is This
+
+
+## Screenshoots
+
+
+## License
+
+Copyright (C) 2015 Bartosz Firyn
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

webcam-capture-examples/webcam-capture-websockets/pom.xml

@@ -0,0 +1,40 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+
+	<modelVersion>4.0.0</modelVersion>
+
+	<parent>
+		<groupId>com.github.sarxos</groupId>
+		<artifactId>webcam-capture-examples</artifactId>
+		<version>0.3.11-SNAPSHOT</version>
+	</parent>
+
+	<artifactId>webcam-capture-example-websockets</artifactId>
+	<packaging>jar</packaging>
+
+	<name>Webcam Capture - WebSockets Example</name>
+	<description>Example demonstrating how to transmit images over WebSockets from webcam server to the web application frontend</description>
+
+	<dependencies>
+		<dependency>
+			<groupId>com.github.sarxos</groupId>
+			<artifactId>webcam-capture-driver-ipcam</artifactId>
+			<version>${project.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>org.eclipse.jetty.aggregate</groupId>
+			<artifactId>jetty-all</artifactId>
+			<version>9.2.7.v20150116</version>
+		</dependency>
+		<dependency>
+			<groupId>org.slf4j</groupId>
+			<artifactId>slf4j-simple</artifactId>
+			<version>1.7.2</version>
+		</dependency>
+		<dependency>
+			<groupId>com.fasterxml.jackson.core</groupId>
+			<artifactId>jackson-databind</artifactId>
+			<version>2.5.1</version>
+		</dependency>
+	</dependencies>
+
+</project>

webcam-capture-examples/webcam-capture-websockets/src/main/html/index.html

@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html>
+	<head>
+		<script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
+		<script src="ws.js"></script>
+		<link rel="stylesheet" type="text/css" href="style.css">
+	</head>
+    <body>
+    	<div class='wrapper'>
+	        <h1>webcam websocket transport example</h1>
+	        <div id="webcams"></div>
+    	</div>
+    </body>
+</html>

webcam-capture-examples/webcam-capture-websockets/src/main/html/style.css

@@ -0,0 +1,16 @@
+
+.wrapper {
+	margin-left: auto;
+	margin-right: auto;
+	width: 1084px;
+	text-align: center;
+}
+
+img {
+	margin-left: 8px;
+	margin-bottom: 8px;
+	width: 348px;
+	height: 198px;
+	box-shadow: 0 0 16px #444;
+	border: 1px solid #fff;
+}

webcam-capture-examples/webcam-capture-websockets/src/main/html/ws.js

@@ -0,0 +1,50 @@
+$(document).ready(function() {
+
+	var ws = new WebSocket("ws://127.0.0.1:8123/");
+
+	ws.onopen = function(e) {
+		if (typeof console !== 'undefined') {
+			console.info('WS open');
+		}
+	};
+
+	ws.onmessage = function (e) {
+
+		var data = JSON.parse(e.data),
+			type = data.type,
+			i = 0,
+			$webcams = $('#webcams'),
+			$img = null;
+
+		if (typeof console !== 'undefined') {
+			console.info('WS message', type);
+		}
+
+		if (type === 'list') {
+			for (i = 0; i < data.webcams.length; i += 1) {
+				$img = $("<img></img>")
+					.attr("src", "webcam-capture-logo-small.jpg")
+					.attr("alt", data.webcams[i])
+					.attr("name", data.webcams[i]);
+				$webcams.append($img)
+			}
+		} else if (type === 'image') {
+			$("img[name='" + data.webcam + "']")
+				.attr("src", "data:image/jpeg;base64," + data.image)
+				.trigger("change");
+		}
+	};
+
+	ws.onclose = function() {
+		if (typeof console !== 'undefined') {
+			console.info('WS close');
+		}
+	};
+
+	ws.onerror = function(err) {
+		if (typeof console !== 'undefined') {
+			console.info('WS error');
+		}
+	};
+});
+

webcam-capture-examples/webcam-capture-websockets/src/main/java/WebcamCache.java

@@ -0,0 +1,85 @@
+import java.awt.image.BufferedImage;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import com.github.sarxos.webcam.Webcam;
+import com.github.sarxos.webcam.WebcamEvent;
+import com.github.sarxos.webcam.WebcamListener;
+import com.github.sarxos.webcam.WebcamUpdater;
+
+
+public class WebcamCache implements WebcamUpdater.DelayCalculator, WebcamListener {
+
+	/**
+	 * How often images are updated on Dasding server.
+	 */
+	private static final long DELAY = 10000;
+
+	/**
+	 * Webcams list.
+	 */
+	private Map<String, Webcam> webcams = new HashMap<String, Webcam>();
+
+	/**
+	 * WebSocket handlers.
+	 */
+	private List<WebcamWebSocketHandler> handlers = new ArrayList<WebcamWebSocketHandler>();
+
+	/**
+	 * Static instance to make access easier.
+	 */
+	private static final WebcamCache CACHE = new WebcamCache();
+
+	public WebcamCache() {
+		for (Webcam webcam : Webcam.getWebcams()) {
+			webcam.addWebcamListener(this);
+			webcam.open(true, this);
+			webcams.put(webcam.getName(), webcam);
+		}
+	}
+
+	@Override
+	public long calculateDelay(long snapshotDuration, double deviceFps) {
+		return Math.max(DELAY - snapshotDuration, 0);
+	}
+
+	public static BufferedImage getImage(String name) {
+		return CACHE.webcams.get(name).getImage();
+	}
+
+	public static List<String> getWebcamNames() {
+		return new ArrayList<String>(CACHE.webcams.keySet());
+	}
+
+	@Override
+	public void webcamOpen(WebcamEvent we) {
+		// do nothing
+	}
+
+	@Override
+	public void webcamClosed(WebcamEvent we) {
+		// do nothing
+	}
+
+	@Override
+	public void webcamDisposed(WebcamEvent we) {
+		// do nothing
+	}
+
+	@Override
+	public void webcamImageObtained(WebcamEvent we) {
+		for (WebcamWebSocketHandler handler : handlers) {
+			handler.newImage(we.getSource(), we.getImage());
+		}
+	}
+
+	public static void subscribe(WebcamWebSocketHandler handler) {
+		CACHE.handlers.add(handler);
+	}
+
+	public static void unsubscribe(WebcamWebSocketHandler handler) {
+		CACHE.handlers.remove(handler);
+	}
+}

webcam-capture-examples/webcam-capture-websockets/src/main/java/WebcamWebSocketHandler.java

@@ -0,0 +1,120 @@
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.UnsupportedEncodingException;
+import java.util.Base64;
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.imageio.ImageIO;
+
+import org.eclipse.jetty.websocket.api.Session;
+import org.eclipse.jetty.websocket.api.annotations.OnWebSocketClose;
+import org.eclipse.jetty.websocket.api.annotations.OnWebSocketConnect;
+import org.eclipse.jetty.websocket.api.annotations.OnWebSocketError;
+import org.eclipse.jetty.websocket.api.annotations.OnWebSocketMessage;
+import org.eclipse.jetty.websocket.api.annotations.WebSocket;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.github.sarxos.webcam.Webcam;
+
+
+@WebSocket
+public class WebcamWebSocketHandler {
+
+	private static final Logger LOG = LoggerFactory.getLogger(WebcamWebSocketHandler.class);
+
+	private static final ObjectMapper MAPPER = new ObjectMapper();
+
+	private Session session;
+
+	private void teardown() {
+		try {
+			session.close();
+			session = null;
+		} finally {
+			WebcamCache.unsubscribe(this);
+		}
+	}
+
+	private void setup(Session session) {
+
+		this.session = session;
+
+		Map<String, Object> message = new HashMap<String, Object>();
+		message.put("type", "list");
+		message.put("webcams", WebcamCache.getWebcamNames());
+
+		send(message);
+
+		WebcamCache.subscribe(this);
+	}
+
+	@OnWebSocketClose
+	public void onClose(int status, String reason) {
+		LOG.info("WebSocket closed, status = {}, reason = {}", status, reason);
+		teardown();
+	}
+
+	@OnWebSocketError
+	public void onError(Throwable t) {
+		LOG.error("WebSocket error", t);
+		teardown();
+	}
+
+	@OnWebSocketConnect
+	public void onConnect(Session session) {
+		LOG.info("WebSocket connect, from = {}", session.getRemoteAddress().getAddress());
+		setup(session);
+	}
+
+	@OnWebSocketMessage
+	public void onMessage(String message) {
+		LOG.info("WebSocket message, text = {}", message);
+	}
+
+	public void newImage(Webcam webcam, BufferedImage image) {
+
+		LOG.info("New image from {}", webcam);
+
+		ByteArrayOutputStream baos = new ByteArrayOutputStream();
+		try {
+			ImageIO.write(image, "JPG", baos);
+		} catch (IOException e) {
+			LOG.error(e.getMessage(), e);
+		}
+
+		String base64 = null;
+		try {
+			base64 = new String(Base64.getEncoder().encode(baos.toByteArray()), "UTF8");
+		} catch (UnsupportedEncodingException e) {
+			LOG.error(e.getMessage(), e);
+		}
+
+		Map<String, Object> message = new HashMap<String, Object>();
+		message.put("type", "image");
+		message.put("webcam", webcam.getName());
+		message.put("image", base64);
+
+		send(message);
+	}
+
+	private void send(String message) {
+		try {
+			session.getRemote().sendString(message);
+		} catch (IOException e) {
+			LOG.error("Exception when sending string", e);
+		}
+	}
+
+	private void send(Object object) {
+		try {
+			send(MAPPER.writeValueAsString(object));
+		} catch (JsonProcessingException e) {
+			LOG.error(e.getMessage(), e);
+		}
+	}
+}