VideoMode.java

   1 package kaka.cakelight.mode;
   2
   3 import kaka.cakelight.Configuration;
   4 import kaka.cakelight.FrameGrabber;
   5 import kaka.cakelight.VideoDeviceListener;
   6 import kaka.cakelight.VideoFrame;
   7
   8 import java.io.File;
   9 import java.io.IOException;
  10 import java.util.Optional;
  11 import java.util.function.Consumer;
  12
  13 public class VideoMode extends Mode {
  14     private Configuration config;
  15     private Thread grabberThread;
  16     private Consumer<VideoFrame> frameConsumer;
  17     private VideoDeviceListener deviceListener;
  18     private boolean isPaused = false;
  19
  20     public VideoMode() {
  21         deviceListener = new VideoDeviceListener();
  22         deviceListener.onVideoDeviceChange(this::onVideoDeviceChange);
  23     }
  24
  25     @Override
  26     public void enter(Configuration config) {
  27         this.config = config;
  28         deviceListener.startListening();
  29     }
  30
  31     @Override
  32     public void pause() {
  33         isPaused = true;
  34     }
  35
  36     @Override
  37     public void resume() {
  38         isPaused = false;
  39         synchronized (grabberThread) {
  40             grabberThread.notify();
  41         }
  42     }
  43
  44     @Override
  45     public void exit() {
  46         grabberThread.interrupt();
  47         deviceListener.stopListening();
  48     }
  49
  50     private void startGrabberThread(File videoDevice) {
  51         assert frameConsumer != null;
  52         grabberThread = new Thread() {
  53             public void run() {
  54                 try (FrameGrabber grabber = FrameGrabber.from(videoDevice, config)) {
  55                     while (!isInterrupted()) {
  56                         Optional<VideoFrame> frame = grabber.grabFrame();
  57                         if (isPaused) {
  58                             synchronized (grabberThread) {
  59                                 wait();
  60                             }
  61                         }
  62                         if (frameConsumer != null) frame.ifPresent(frameConsumer);
  63                         frame.ifPresent(VideoMode.this::onVideoFrame);
  64 //                        timeIt("frame", grabber::grabFrame);
  65                     }
  66                 } catch (IOException | InterruptedException e) {
  67                     e.printStackTrace();
  68                 }
  69             }
  70         };
  71         grabberThread.start();
  72     }
  73
  74     public void onVideoFrame(Consumer<VideoFrame> consumer) {
  75         frameConsumer = consumer;
  76     }
  77
  78     private void onVideoFrame(VideoFrame frame) {
  79         updateWithFrame(frame.getLedFrame());
  80     }
  81
  82     public void onVideoDeviceChange(Optional<File> videoDevice) {
  83         // Should only happen when this mode is active!
  84         if (grabberThread != null) {
  85             grabberThread.interrupt();
  86         }
  87         videoDevice.ifPresent(this::startGrabberThread);
  88     }
  89 }