From 76cdc991cef9cc658d1c0c8bff0e489c6a9d693f Mon Sep 17 00:00:00 2001
From: Bartosz Firyn <bartoszfiryn@gmail.com>
Date: Wed, 21 Jan 2015 11:24:25 +0100
Subject: [PATCH] Test vlcj direct rendering

---
 .../src/example/java/VlcjDirectTest.java      | 180 ++++++++++++++++++
 1 file changed, 180 insertions(+)
 create mode 100644 webcam-capture-drivers/driver-vlcj/src/example/java/VlcjDirectTest.java

diff --git a/webcam-capture-drivers/driver-vlcj/src/example/java/VlcjDirectTest.java b/webcam-capture-drivers/driver-vlcj/src/example/java/VlcjDirectTest.java
new file mode 100644
index 00000000..5de9231e
--- /dev/null
+++ b/webcam-capture-drivers/driver-vlcj/src/example/java/VlcjDirectTest.java
@@ -0,0 +1,180 @@
+
+
+import java.awt.Transparency;
+import java.awt.color.ColorSpace;
+import java.awt.image.BufferedImage;
+import java.awt.image.ComponentColorModel;
+import java.awt.image.ComponentSampleModel;
+import java.awt.image.DataBuffer;
+import java.awt.image.DataBufferByte;
+import java.awt.image.Raster;
+import java.awt.image.WritableRaster;
+import java.io.File;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+import javax.imageio.ImageIO;
+
+import uk.co.caprica.vlcj.player.MediaPlayerFactory;
+import uk.co.caprica.vlcj.player.direct.BufferFormat;
+import uk.co.caprica.vlcj.player.direct.BufferFormatCallback;
+import uk.co.caprica.vlcj.player.direct.DirectMediaPlayer;
+import uk.co.caprica.vlcj.player.direct.RenderCallback;
+import uk.co.caprica.vlcj.player.direct.format.RV32BufferFormat;
+
+import com.sun.jna.Memory;
+
+
+public class VlcjDirectTest {
+
+	private static class TestBufferFormatCallback implements BufferFormatCallback {
+
+		@Override
+		public BufferFormat getBufferFormat(int sourceWidth, int sourceHeight) {
+			return new RV32BufferFormat(sourceWidth, sourceHeight);
+		}
+	}
+
+	/**
+	 * RGB offsets.
+	 */
+	private static final int[] BAND_OFFSETS = new int[] { 2, 1, 0 };
+	/**
+	 * Number of bytes in each pixel.
+	 */
+	private static final int[] BITS = { 8, 8, 8 };
+
+	/**
+	 * Image color space.
+	 */
+	private static final ColorSpace COLOR_SPACE = ColorSpace.getInstance(ColorSpace.CS_sRGB);
+
+	/**
+	 * Data type used in image.
+	 */
+	private static final int DATA_TYPE = DataBuffer.TYPE_BYTE;
+
+	private final static String[] VLC_ARGS = {
+
+		// VLC args by Andrew Davison:
+		// http://fivedots.coe.psu.ac.th/~ad/jg/nui025/snapsWithoutJMF.pdf
+
+		// no interface
+		"--intf", "dummy",
+
+		// no video output
+		"--vout", "dummy",
+
+		// no audio decoding
+		"--no-audio",
+
+		// do not display title
+		"--no-video-title-show",
+
+		// no stats
+		"--no-stats",
+
+		// no subtitles
+		"--no-sub-autodetect-file",
+
+		// no snapshot previews
+		"--no-snapshot-preview",
+
+		// reduce capture lag/latency
+		"--live-caching=50",
+
+		// turn off warnings
+		"--quiet",
+	};
+
+	public static void main(String[] args) throws IOException, InterruptedException {
+
+		MediaPlayerFactory mediaPlayerFactory = new MediaPlayerFactory(VLC_ARGS);
+
+		DirectMediaPlayer mediaPlayer = mediaPlayerFactory.newDirectMediaPlayer(
+			new TestBufferFormatCallback(),
+			new RenderCallback() {
+
+				int i = 0;
+
+				@Override
+				public void display(DirectMediaPlayer player, Memory[] buffers, BufferFormat format) {
+
+					final int width = format.getWidth();
+					final int height = format.getHeight();
+
+					System.out.println(width + " x " + height);
+
+					ComponentSampleModel smodel = new ComponentSampleModel(
+						DataBuffer.TYPE_BYTE,
+						width,
+						height,
+						4, // pixel stride
+						width * 4, // scanline stride
+						BAND_OFFSETS);
+
+					ComponentColorModel cmodel = new ComponentColorModel(
+						COLOR_SPACE, BITS, false, false, Transparency.BITMASK, DATA_TYPE);
+
+					if (buffers.length == 0) {
+						System.err.println("No memory elements found!");
+						return;
+					}
+
+					Memory memory = buffers[0];
+
+					if (memory == null) {
+						System.err.println("Null memory!");
+						return;
+					}
+
+					System.out.println("meme " + memory.size());
+
+					ByteBuffer buffer = memory.getByteBuffer(0, memory.size());
+
+					byte[] bytes = new byte[width * height * 4];
+					byte[][] data = new byte[][] { bytes };
+
+					buffer.get(bytes);
+
+					DataBufferByte dbuf = new DataBufferByte(data, bytes.length, new int[] { 0 });
+					WritableRaster raster = Raster.createWritableRaster(smodel, dbuf, null);
+
+					BufferedImage bi = new BufferedImage(cmodel, raster, false, null);
+					bi.flush();
+
+					try {
+						ImageIO.write(bi, "JPG", new File((i++) + "-test.jpg"));
+					} catch (IOException e) {
+						// TODO Auto-generated catch block
+						e.printStackTrace();
+					}
+
+					System.out.println("display " + i);
+				}
+			});
+
+		// Options setup.
+		String mrl = "v4l2:///dev/video0"; // Linux
+
+		String[] options = new String[] {
+			":v4l-vdev=/dev/video0",
+			":v4l-width=640",
+			":v4l-height=480",
+			":v4l-fps=30",
+			":v4l-quality=20",
+			":v4l-adev=none", // no audio device
+		};
+
+		// Start preocessing.
+		mediaPlayer.startMedia(mrl, options);
+
+		Thread.sleep(5000);
+
+		// Stop precessing.
+		mediaPlayer.stop();
+		mediaPlayer = null;
+
+		System.out.println("Finish!");
+	}
+}