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Test vlcj direct rendering
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‎webcam-capture-drivers/driver-vlcj/src/example/java/VlcjDirectTest.java‎

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

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