Examples of javax.media.Buffer

javax.media.Buffer
sun.com/products/java-media/jmf/2.1.1/apidocs/javax/media/Buffer.html" target="_blank">this class in the JMF Javadoc. Coding complete. An observation on the use of Buffer in JMF: it appears that a Buffer is not considered to be immutable as it is processed (by a Codec, etc). JMF will do things like swap the data of two Buffers, or when input is not consumed, update the offset and length. The result of this is that care needs to be taken in implementation code to clone buffers if a buffer is to be used for multiple things (like in a cloned DataSource). @author Ken Larson

  }


  @Override
  public BufferedImage captureScreen(Rectangle area) {
        // Grab a frame
        Buffer buf = fgc.grabFrame();
        
        // Convert it to an image
        BufferToImage btoi = new BufferToImage((VideoFormat)buf.getFormat());
        Image img = btoi.createImage(buf);
  
        while(img==null)
        {
          buf = fgc.grabFrame();
          btoi = new BufferToImage((VideoFormat)buf.getFormat());
          img = btoi.createImage(buf);
  
          try{Thread.sleep(10);}catch(Exception e){}
        }

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  private boolean hasBufferToImage()
  {
    FrameGrabbingControl fg = (FrameGrabbingControl)player.getControl("javax.media.control.FrameGrabbingControl");
    Buffer buf = fg.grabFrame();   // take a snap
    if (buf == null) {
      //System.out.println("No grabbed frame");
      return false;
    }


    // there is a buffer, but check if it's empty
    VideoFormat vf = (VideoFormat) buf.getFormat();
    if (vf == null) {
      //System.out.println("No video format");
      return false;
    }

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    {
      try
      {
        // Grab a frame from the capture device
        FrameGrabbingControl frameGrabber = (FrameGrabbingControl)player.getControl("javax.media.control.FrameGrabbingControl");
        Buffer buf = frameGrabber.grabFrame();


        // Convert frame to an buffered image so it can be processed and saved
        Image img = (new BufferToImage((VideoFormat)buf.getFormat()).createImage(buf));
        BufferedImage buffImg = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_RGB);




        try
        {

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            if (_debugging) {
                _debug("MoveWriter.postfire(): read in " + _jmfImageToken);
            }


            Buffer buffer;
            buffer = _jmfImageToken.getValue();


            if (!_bufferArrayList.add(buffer)) {
                throw new IllegalActionException("Could not add buffer "
                        + "to the array list");

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    public void fire() throws IllegalActionException {
        super.fire();


        if (input.hasToken(0)) {
            JMFImageToken jmfImageToken = (JMFImageToken) input.get(0);
            Buffer in = jmfImageToken.getValue();
            VideoFormat videoFormat = (VideoFormat) in.getFormat();
            YUVFormat yuvFormat = null;


            try {
                yuvFormat = (YUVFormat) videoFormat;
            } catch (ClassCastException ex) {
                throw new IllegalActionException(this, ex, "Failed to cast "
                        + videoFormat.getClass() + ":\n" + videoFormat
                        + "\nto YUVFormat\n" + "in.getFormat() was: "
                        + in.getFormat().getClass()
                        + "\nPerhaps the video source is not generating YUV?");
            }


            byte[] data = (byte[]) in.getData();


            if (data != null) {
                System.arraycopy(data, yuvFormat.getOffsetY(), YArray, 0,
                        YArray.length);
                System.arraycopy(data, yuvFormat.getOffsetU(), UArray, 0,

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        super.fire();


        if (input.hasToken(0)) {
            ImageToken imageToken = (ImageToken) input.get(0);
            Image image = imageToken.asAWTImage();
            Buffer buffer = ImageToBuffer.createBuffer(image, _frameRate);
            output.send(0, new JMFImageToken(buffer));
        }
    }

View Full Code Here

  }


  
  private boolean hasBufferToImage()
  {
    Buffer buf = fg.grabFrame();
      if (buf == null)
      {
        Logger.error("No grabbed frame");
        return false;
      }
      
      // Hay un buffer, pero se debe verificar si est� vac�o o no
      VideoFormat vf = (VideoFormat) buf.getFormat();
      if (vf == null)
        return false;


      int width  = vf.getSize().width;
      int height  = vf.getSize().height;

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  public synchronized BufferedImage grabImage()
  {
    if ( closedDevice )
      return null;


    Buffer buf = fg.grabFrame();
    if (buf == null)
    {
      Logger.error("No grabbed buffer");
      return null;
    }

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    public MP4VFrame(Buffer inBuffer) {
      firstSequenceNumber = inBuffer.getSequenceNumber();
      lastSequenceNumber = RTP.previousSequenceNumber(firstSequenceNumber);
      numPackets++;
      frameBuffer = new Buffer();
      frameBuffer.setData(new byte[FRAME_BUFFER_INITIAL_SIZE]);
      frameBuffer.setOffset(0);
      frameBuffer.setLength(0);
      frameBuffer.setTimeStamp(inBuffer.getTimeStamp());
      outOfOrderFragments = new Vector();

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      return frameBuffer.getLength();
    }
    
    private void addFromQueuedFragments() {
      if (outOfOrderFragments.size() <= 0) return;
      Buffer storedBuf = (Buffer)outOfOrderFragments.get(0);
      if (RTP.areConsecutiveSequenceNumbers(lastSequenceNumber, storedBuf.getSequenceNumber())) {
        outOfOrderFragments.remove(0);
        add(storedBuf);
      }
    }

View Full Code Here

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