* Add new JavaFxPlayVideoAndAudio sample (pull #618)

samples/JavaFxPlayVideoAndAudio.java

@@ -0,0 +1,161 @@
+package javacvtest;
+
+import java.nio.ByteBuffer;
+import java.nio.FloatBuffer;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import javafx.application.Application;
+import javafx.application.Platform;
+import javafx.embed.swing.SwingFXUtils;
+import javafx.scene.Scene;
+import javafx.scene.image.Image;
+import javafx.scene.image.ImageView;
+import javafx.scene.layout.StackPane;
+import javafx.stage.Stage;
+import javax.sound.sampled.AudioFormat;
+import javax.sound.sampled.AudioSystem;
+import javax.sound.sampled.DataLine;
+import javax.sound.sampled.SourceDataLine;
+import org.bytedeco.javacv.FFmpegFrameGrabber;
+import org.bytedeco.javacv.Frame;
+import org.bytedeco.javacv.Java2DFrameConverter;
+import org.bytedeco.javacv.OpenCVFrameConverter;
+
+/**
+ * @author Dmitriy Gerashenko <d.a.gerashenko@gmail.com>
+ */
+public class JavaFxPlayVideoAndAudio extends Application {
+
+    private static final Logger LOG = Logger.getLogger(JavaFxPlayVideoAndAudio.class.getName());
+    private static final double SC16 = (double) 0x7FFF + 0.4999999999999999;
+
+    private static volatile Thread playThread;
+
+    public static void main(String[] args) {
+        launch(args);
+    }
+
+    @Override
+    public void start(Stage primaryStage) throws Exception {
+        StackPane root = new StackPane();
+        ImageView imageView = new ImageView();
+
+        root.getChildren().add(imageView);
+        imageView.fitWidthProperty().bind(primaryStage.widthProperty());
+        imageView.fitHeightProperty().bind(primaryStage.heightProperty());
+
+        Scene scene = new Scene(root, 640, 480);
+
+        primaryStage.setTitle("Video + audio");
+        primaryStage.setScene(scene);
+        primaryStage.show();
+
+        playThread = new Thread(() -> {
+            try {
+                FFmpegFrameGrabber grabber = new FFmpegFrameGrabber("C:\\Users\\gda\\Desktop\\bunny_move\\1486430724718.mp4");
+                grabber.start();
+                AudioFormat audioFormat = new AudioFormat(44100, 16, 1, true, true);
+
+                DataLine.Info info = new DataLine.Info(SourceDataLine.class, audioFormat);
+                SourceDataLine soundLine = (SourceDataLine) AudioSystem.getLine(info);
+                soundLine.open(audioFormat);
+                soundLine.start();
+
+                OpenCVFrameConverter converter = new OpenCVFrameConverter.ToIplImage();
+                Java2DFrameConverter paintConverter = new Java2DFrameConverter();
+
+                ExecutorService executor = Executors.newSingleThreadExecutor();
+
+                while (!Thread.interrupted()) {
+                    Frame frame = grabber.grab();
+                    if (frame == null) {
+                        break;
+                    }
+                    if (frame.image != null) {
+                        Image image = SwingFXUtils.toFXImage(paintConverter.convert(frame), null);
+                        Platform.runLater(() -> {
+                            imageView.setImage(image);
+                        });
+                    } else if (frame.samples != null) {
+                        FloatBuffer channelSamplesFloatBuffer = (FloatBuffer) frame.samples[0];
+                        channelSamplesFloatBuffer.rewind();
+
+                        ByteBuffer outBuffer = ByteBuffer.allocate(channelSamplesFloatBuffer.capacity() * 2);
+
+                        for (int i = 0; i < channelSamplesFloatBuffer.capacity(); i++) {
+                            /**
+                             * FloatBuffer is converted to ByteBuffer with some
+                             * magic constant SC16 (~Short.MAX_VALUE). I found
+                             * it on some forum with this explanation:
+                             *
+                             * For 16 bit signed to float, divide by 32768. For
+                             * float to 16 bit, multiply by 32768.
+                             *
+                             * Going from float to integer, do the initial
+                             * conversion into a container bigger than the
+                             * destination container so that it doesn't
+                             * accidentally wrap on overs. For instance, on 16
+                             * or 24 bit, you can use signed int 32.
+                             *
+                             * Or alternately, do the clipping on the scaled
+                             * float value, before casting into integer. That
+                             * way you can save the clipped float direct to a 16
+                             * bit container and not have to fool with an
+                             * intermediate 32 bit container.
+                             *
+                             * Clip the float to int results to stay in bounds.
+                             * Anything lower than 0x8000 clipped to 0x8000, and
+                             * anything higher than 0x7FFFF clipped to 0x7FFFF.
+                             *
+                             * The advantage of using a factor of 32768 is that
+                             * bit patterns will stay the same after conversion.
+                             * If you use 32767, the bit patterns will change.
+                             * Not much change, but it just doesn't seem elegant
+                             * to have them change if it can be avoided.
+                             *
+                             * If you want to do it as fast as possible it is
+                             * just a matter of optimizing the code in whatever
+                             * way seems sensible.
+                             */
+                            // Could be replaced with: short val = (short) (channelSamplesFloatBuffer.get(i) * Short.MAX_VALUE);
+                            short val = (short) ((double) channelSamplesFloatBuffer.get(i) * SC16);
+                            outBuffer.putShort(val);
+                        }
+
+                        /**
+                         * We need this because soundLine.write ignores
+                         * interruptions during writing.
+                         */
+                        try {
+                            executor.submit(() -> {
+                                soundLine.write(outBuffer.array(), 0, outBuffer.capacity());
+                                outBuffer.clear();
+                            }).get();
+                        } catch (InterruptedException interruptedException) {
+                            Thread.currentThread().interrupt();
+                        }
+                    }
+                }
+                executor.shutdownNow();
+                executor.awaitTermination(10, TimeUnit.SECONDS);
+                soundLine.stop();
+                grabber.stop();
+                grabber.release();
+                Platform.exit();
+            } catch (Exception exception) {
+                LOG.log(Level.SEVERE, null, exception);
+                System.exit(1);
+            }
+        });
+        playThread.start();
+    }
+
+    @Override
+    public void stop() throws Exception {
+        playThread.interrupt();
+    }
+
+}