www in docker support

decompiled-libs/www/acxent-videoj-1.0.0/org/jcodec/containers/y4m/Y4MDemuxer.java

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+package org.jcodec.containers.y4m;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+import java.util.List;
+import org.jcodec.common.Codec;
+import org.jcodec.common.Demuxer;
+import org.jcodec.common.DemuxerTrack;
+import org.jcodec.common.DemuxerTrackMeta;
+import org.jcodec.common.StringUtils;
+import org.jcodec.common.TrackType;
+import org.jcodec.common.VideoCodecMeta;
+import org.jcodec.common.io.NIOUtils;
+import org.jcodec.common.io.SeekableByteChannel;
+import org.jcodec.common.model.ColorSpace;
+import org.jcodec.common.model.Packet;
+import org.jcodec.common.model.Rational;
+import org.jcodec.common.model.Size;
+import org.jcodec.platform.Platform;
+
+public class Y4MDemuxer implements DemuxerTrack, Demuxer {
+  private SeekableByteChannel is;
+  
+  private int width;
+  
+  private int height;
+  
+  private String invalidFormat;
+  
+  private Rational fps;
+  
+  private int bufSize;
+  
+  private int frameNum;
+  
+  private int totalFrames;
+  
+  private int totalDuration;
+  
+  public Y4MDemuxer(SeekableByteChannel _is) throws IOException {
+    this.is = _is;
+    ByteBuffer buf = NIOUtils.fetchFromChannel(this.is, 2048);
+    String[] header = StringUtils.splitC(readLine(buf), ' ');
+    if (!"YUV4MPEG2".equals(header[0])) {
+      this.invalidFormat = "Not yuv4mpeg stream";
+      return;
+    } 
+    String chroma = find(header, 'C');
+    if (chroma != null && !chroma.startsWith("420")) {
+      this.invalidFormat = "Only yuv420p is supported";
+      return;
+    } 
+    this.width = Integer.parseInt(find(header, 'W'));
+    this.height = Integer.parseInt(find(header, 'H'));
+    String fpsStr = find(header, 'F');
+    if (fpsStr != null) {
+      String[] numden = StringUtils.splitC(fpsStr, ':');
+      this.fps = new Rational(Integer.parseInt(numden[0]), Integer.parseInt(numden[1]));
+    } 
+    this.is.setPosition((long)buf.position());
+    this.bufSize = this.width * this.height;
+    this.bufSize += this.bufSize / 2;
+    long fileSize = this.is.size();
+    this.totalFrames = (int)(fileSize / (long)(this.bufSize + 7));
+    this.totalDuration = this.totalFrames * this.fps.getDen() / this.fps.getNum();
+  }
+  
+  public Packet nextFrame() throws IOException {
+    if (this.invalidFormat != null)
+      throw new RuntimeException("Invalid input: " + this.invalidFormat); 
+    ByteBuffer buf = NIOUtils.fetchFromChannel(this.is, 2048);
+    String frame = readLine(buf);
+    if (frame == null || !frame.startsWith("FRAME"))
+      return null; 
+    this.is.setPosition(this.is.position() - (long)buf.remaining());
+    ByteBuffer pix = NIOUtils.fetchFromChannel(this.is, this.bufSize);
+    Packet packet = new Packet(pix, (long)(this.frameNum * this.fps.getDen()), this.fps.getNum(), (long)this.fps.getDen(), (long)this.frameNum, Packet.FrameType.KEY, null, this.frameNum);
+    this.frameNum++;
+    return packet;
+  }
+  
+  private static String find(String[] header, char c) {
+    for (int i = 0; i < header.length; i++) {
+      String string = header[i];
+      if (string.charAt(0) == c)
+        return string.substring(1); 
+    } 
+    return null;
+  }
+  
+  private static String readLine(ByteBuffer y4m) {
+    ByteBuffer duplicate = y4m.duplicate();
+    while (y4m.hasRemaining() && y4m.get() != 10);
+    if (y4m.hasRemaining())
+      duplicate.limit(y4m.position() - 1); 
+    return Platform.stringFromBytes(NIOUtils.toArray(duplicate));
+  }
+  
+  public Rational getFps() {
+    return this.fps;
+  }
+  
+  public DemuxerTrackMeta getMeta() {
+    return new DemuxerTrackMeta(TrackType.VIDEO, Codec.RAW, (double)this.totalDuration, null, this.totalFrames, null, 
+        VideoCodecMeta.createSimpleVideoCodecMeta(new Size(this.width, this.height), ColorSpace.YUV420), null);
+  }
+  
+  public void close() throws IOException {
+    this.is.close();
+  }
+  
+  public List<? extends DemuxerTrack> getTracks() {
+    List<DemuxerTrack> list = new ArrayList<>();
+    list.add(this);
+    return list;
+  }
+  
+  public List<? extends DemuxerTrack> getVideoTracks() {
+    return getTracks();
+  }
+  
+  public List<? extends DemuxerTrack> getAudioTracks() {
+    return new ArrayList<>();
+  }
+}