src/kaka/cakelight/mode/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
  19     public VideoMode() {
  20         deviceListener = new VideoDeviceListener();
  21         deviceListener.onVideoDeviceChange(this::onVideoDeviceChange);
  22     }
  23
  24     @Override
  25     public void enter(Configuration config) {
  26         this.config = config;
  27         deviceListener.startListening();
  28     }
  29
  30     @Override
  31     public void pause() {
  32         try {
  33             grabberThread.wait();
  34         } catch (InterruptedException e) {
  35             e.printStackTrace();
  36         }
  37     }
  38
  39     @Override
  40     public void resume() {
  41         grabberThread.notify();
  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 (frameConsumer != null) frame.ifPresent(frameConsumer);
  58                         frame.ifPresent(VideoMode.this::onVideoFrame);
  59 //                        timeIt("frame", grabber::grabFrame);
  60                     }
  61                 } catch (IOException e) {
  62                     e.printStackTrace();
  63                 }
  64             }
  65         };
  66         grabberThread.start();
  67     }
  68
  69     public void onVideoFrame(Consumer<VideoFrame> consumer) {
  70         frameConsumer = consumer;
  71     }
  72
  73     private void onVideoFrame(VideoFrame frame) {
  74         updateWithFrame(frame.getLedFrame());
  75     }
  76
  77     public void onVideoDeviceChange(Optional<File> videoDevice) {
  78         // Should only happen when this mode is active!
  79         if (grabberThread != null) {
  80             grabberThread.interrupt();
  81         }
  82         videoDevice.ifPresent(this::startGrabberThread);
  83     }
  84 }