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In the past, I had always planned to make a video communication software based on UDP communication on the local area network. I did not know how the video stream was transmitted on the network. Although I know the encoding format of several video streams, I have not actually put it into practice. When learning Android watch development, I saw a project on the github that transferred the real-time video of the mobile phone to the watch, and found a LAN video transmission method that seems to be low-grade but should be more practical on the local area network: directly compress the image obtained from the camera. Send it.This project GitHub homepage: https://github.com/retravel/AndroidRealTimeVideo
Get webcam real-time pictures, UDP send pictures
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Private void initCanmera() { Int cameras = Camera.getNumberOfCameras(); Camera.CameraInfo info = new Camera.CameraInfo(); For (int i = 0; i < cameras; i++) { Camera.getCameraInfo(i, info); If (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) { Camera = Camera.open(i); Break; } } //No front camera If (camera == null) camera = Camera.open(); Try { camera.setPreviewDisplay(surfaceHolder); camera.setPreviewCallback(this); } Catch (Exception e) { Camera.release();//release resources Camera = null; } } @Override Public void onPreviewFrame(byte[] data, Camera camera) { Camera.Size previewSize = camera.getParameters().getPreviewSize(); Int[] rgb = decodeYUV420SP(data,previewSize.width, previewSize.height); Bitmap bmp = Bitmap.createBitmap(rgb, previewSize.width, previewSize.height, Bitmap.Config.ARGB_8888); Int smallWidth, smallHeight; Int dimension = 200; If (previewSize.width > previewSize.height) { smallWidth = dimension; smallHeight = dimension * previewSize.height / previewSize.width; } Else { smallHeight = dimension; smallWidth = dimension *previewSize.width / previewSize.height; } Matrix matrix = new Matrix(); matrix.postRotate(mCameraOrientation); Bitmap bmpSmall = Bitmap.createScaledBitmap(bmp, smallWidth, smallHeight, false); Bitmap bmpSmallRotated = Bitmap.createBitmap(bmpSmall, 0, 0, smallWidth, smallHeight, matrix, false); ByteArrayOutputStream baos = new ByteArrayOutputStream(); bmpSmallRotated.compress(Bitmap.CompressFormat.WEBP, 80, baos); up.sendMsg(baos.toByteArray()); } @Override Public void surfaceCreated(SurfaceHolder holder) { initCanmera(); } @Override Public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { Int currentCamera = Camera.CameraInfo.CAMERA_FACING_FRONT; Camera.Parameters parameters = camera.getParameters();//Get camera settings Camera.Size size = camera.getParameters().getPreviewSize(); //Get preview size parameters.setPictureFormat(PixelFormat.JPEG);//Set the picture format Camera.CameraInfo info = new Camera.CameraInfo(); camera.getCameraInfo(currentCamera, info); Int rotation = this.getWindowManager().getDefaultDisplay().getRotation(); Int degrees = 0; Switch (rotation) { Case Surface.ROTATION_0: Degrees = 0; Break; Case Surface.ROTATION_90: Degrees = 90; Break; Case Surface.ROTATION_180: Degrees = 180; Break; Case Surface.ROTATION_270: Degrees = 270; Break; } Int resultA = 0, resultB = 0; If (currentCamera == Camera.CameraInfo.CAMERA_FACING_BACK) { resultA = (info.orientation - degrees + 360) % 360; resultB = (info.orientation - degrees + 360) % 360; camera.setDisplayOrientation(resultA); } Else { resultA = (360 + 360 - info.orientation - degrees) % 360; resultB = (info.orientation + degrees) % 360; camera.setDisplayOrientation(resultA); } camera.setPreviewCallback(this); parameters.setRotation(resultB); mCameraOrientation = resultB; camera.setParameters(parameters); camera.startPreview();//Start preview } @Override Public void surfaceDestroyed(SurfaceHolder holder) { If (camera != null) { camera.setPreviewCallback(null); camera.stopPreview(); Camera.release(); Camera = null; } } |
UDP server
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Package cn.wangbaiyuan.androidsocketav; /** * Created by BrainWang on 2016/3/21. */ Import java.io.IOException; Import java.net.DatagramPacket; Import java.net.DatagramSocket; Import java.net.InetSocketAddress; Import java.net.SocketAddress; Import java.net.SocketException; /** * Server based on UDP protocol to respond to packets from clients * * @author <a href="http://wangbaiyuan">Wang Baiyuan</a> */ Public class UDPServer { /** * Port */ //int port=1888; DatagramSocket socket; String lastString = (-1 + ""); Int sameTime = 0; Public handleReceiveData callback; Public UDPServer(int port) throws SocketException { Socket = new DatagramSocket(port); //Server DatagramSocket System.out.println("Server started."); } Public void setReceiveCallback(handleReceiveData call) { Callback = call; } Public void service() throws IOException { While (true) { DatagramPacket dp = new DatagramPacket(new byte[102400], 102400); Socket.receive(dp); // Receive client information Byte[] data = dp.getData(); callback.handleReceive(data); } } Public void start() throws SocketException, IOException { Service(); } Public void sendMsg(final byte[] data) { Thread send = new Thread(new Runnable() { @Override Public void run() { Try { If (socket != null) { SocketAddress socketAddres = new InetSocketAddress("192.168.1.110", 8804); Socket.send(new DatagramPacket(data, data.length, socketAddres)); } } Catch (IOException e) { e.printStackTrace(); } } }); Send.start(); } } |
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Reprinted Note Source: Baiyuan's Blog>>https://wangbaiyuan.cn/en/local-area-network-lan-simple-udp-video-calls-2.html
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