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

        
        final Link linkDest = n.getDestLink(i);
        if (linkDest != null)
        {  if (n.getOutputBuffer(i) == null)
            throw new NullPointerException("Buffer " + i + " is null, trackNumber=" + sourceTrackNumber + ", flags=" + flags);
          final Buffer b = n.getOutputBuffer(i);
          // TODO: what is the proper place to check for and/or propagate EOM/discard?
//          if (b.isEOM())
//            continue;
          if (b.isDiscard())
          {  
//            try
//            {
//              Thread.sleep(20);
//            } catch (InterruptedException e)

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      if ((flags & FilterGraphProcessor.SUPPRESS_TRACK_READ) == 0)
      {
        // JMF re-uses the previous buffer
        if (getOutputBuffer(i) == null)
        {
          setOutputBuffer(i, new Buffer());
        }
        final Buffer buffer1 = getOutputBuffer(i);
        buffer1.setLength(0);
        buffer1.setSequenceNumber(sequenceNumber++); // TODO: 1 seq # per track is needed
        buffer1.setFlags(0);  // clear all flags. TODO: does JMF do this?  Or must the demux itself clear the flags?
        
//        // It does not appear that JMF sets the timestamp to what it thinks it is going to be.
        // although this is theoretically possible knowing the frame/buffer # and the framerate.


        // according to the docs,  Each track has a sequence number that is updated by the Demultiplexer for each frame
        // however, the OggDemux does not do this, and it appears that JMF sets the sequence number before giving it to the demux.
//         TODO: other fields to clear?
        
        
        getTracks()[i].readFrame(buffer1);
        if (buffer1.getFormat() == null)
          buffer1.setFormat(getTracks()[i].getFormat());  // TODO: is this right?  JMF appears to set the format in between demux track read adnd codec process.


      }


    }

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  {
    final MyBasicPlugIn p = new MyBasicPlugIn();
    
    // test empty buffer:
    {
      final Buffer b = new Buffer();
      assertEquals(b.getData(), null);
      assertEquals(b.getLength(), 0);
      assertEquals(b.getOffset(), 0);
      
      for (int i = 0; i < 10; ++i)
      {
        final byte[] ba = p.doValidateByteArraySize(b, i);
        assertEquals(ba.length, i);
        for (int j = 0; j < i; ++j)
        {  assertEquals(ba[j], 0);
        }
        assertEquals(b.getData(), ba);
        assertEquals(b.getLength(), 0);
        assertEquals(b.getOffset(), 0);
      }
    }
    
    // buf of len 5 with length set to 5:
    {
      final Buffer b = new Buffer();
      final byte[] bBuf = new byte[5];
      b.setData(bBuf);
      b.setLength(bBuf.length);
      assertTrue(b.getData() == bBuf);
      assertEquals(b.getLength(), bBuf.length);
      assertEquals(b.getOffset(), 0);
      
      for (int i = 0; i < 10; ++i)
      {
        final byte[] ba = p.doValidateByteArraySize(b, i);
        if (i >  bBuf.length)
          assertTrue(ba != bBuf);
        else
          assertTrue(ba == bBuf);
        final int max = i > bBuf.length ? i : bBuf.length;
        assertEquals(ba.length, max);
        for (int j = 0; j < i; ++j)
        {  assertEquals(ba[j], 0);
        }
        assertEquals(b.getData(), ba);
        assertEquals(b.getLength(), bBuf.length);
        assertEquals(b.getOffset(), 0);
      }
    }
    
    // buf of len 5 with length set to 0:
    {
      final Buffer b = new Buffer();
      final byte[] bBuf = new byte[5];
      b.setData(bBuf);
      b.setLength(0);
      assertTrue(b.getData() == bBuf);
      assertEquals(b.getLength(), 0);
      assertEquals(b.getOffset(), 0);
      
      for (int i = 0; i < 10; ++i)
      {
        final byte[] ba = p.doValidateByteArraySize(b, i);
        if (i >  bBuf.length)
          assertTrue(ba != bBuf);
        else
          assertTrue(ba == bBuf);
        final int max = i > bBuf.length ? i : bBuf.length;
        assertEquals(ba.length, max);
        for (int j = 0; j < i; ++j)
        {  assertEquals(ba[j], 0);
        }
        assertEquals(b.getData(), ba);
        assertEquals(b.getLength(), 0);
        assertEquals(b.getOffset(), 0);
      }
    }
    
    // it appears that getLength/setLength has nothing to do with doValidateByteArraySize.
    // doValidateByteArraySize looks like it checks the size of the buf, and reallocates it
    // if too small.
    
    // try with a non-bytearray
    {
      final Buffer b = new Buffer();
      final int[] bBuf = new int[5];
      b.setData(bBuf);
      b.setLength(0);
      assertTrue(b.getData() == bBuf);
      assertEquals(b.getLength(), 0);
      assertEquals(b.getOffset(), 0);
      
      for (int i = 0; i < 10; ++i)
      {
        final byte[] ba = p.doValidateByteArraySize(b, i);
//        if (i >  bBuf.length)
//          assertTrue(ba != bBuf);
//        else
//          assertTrue(ba == bBuf);
        assertEquals(ba.length, i);
        for (int j = 0; j < i; ++j)
        {  assertEquals(ba[j], 0);
        }
        assertEquals(b.getData(), ba);
        assertEquals(b.getLength(), 0);
        assertEquals(b.getOffset(), 0);
      }
    }
    
    // appears to simply reallocate if not a byte array.
    // See if it copies existing data:
    {
      final Buffer b = new Buffer();
      final byte[] bBuf = new byte[] {0, 1, 2, 3, 4};
      b.setData(bBuf);
      b.setLength(0);
      assertTrue(b.getData() == bBuf);
      assertEquals(b.getLength(), 0);
      assertEquals(b.getOffset(), 0);
      
      for (int i = 0; i < 10; ++i)
      {
        final byte[] ba = p.doValidateByteArraySize(b, i);
        if (i >  bBuf.length)
          assertTrue(ba != bBuf);
        else
          assertTrue(ba == bBuf);
        final int max = i > bBuf.length ? i : bBuf.length;
        assertEquals(ba.length, max);
        for (int j = 0; j < i; ++j)
        {  
          if (j < bBuf.length)
            assertEquals(ba[j], bBuf[j]);
          else
            assertEquals(ba[j], 0);
        }
        assertEquals(b.getData(), ba);
        assertEquals(b.getLength(), 0);
        assertEquals(b.getOffset(), 0);
      }
    }
    
    // it does copy existing data.

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  {
    final MyBasicPlugIn p = new MyBasicPlugIn();
    
    // test empty buffer:
    {
      final Buffer b = new Buffer();
      assertEquals(b.getData(), null);
      assertEquals(b.getLength(), 0);
      assertEquals(b.getOffset(), 0);
      
      for (int i = 0; i < 10; ++i)
      {
        final short[] ba = p.doValidateShortArraySize(b, i);
        assertEquals(ba.length, i);
        for (int j = 0; j < i; ++j)
        {  assertEquals(ba[j], 0);
        }
        assertEquals(b.getData(), ba);
        assertEquals(b.getLength(), 0);
        assertEquals(b.getOffset(), 0);
      }
    }
    
    // buf of len 5 with length set to 5:
    {
      final Buffer b = new Buffer();
      final short[] bBuf = new short[5];
      b.setData(bBuf);
      b.setLength(bBuf.length);
      assertTrue(b.getData() == bBuf);
      assertEquals(b.getLength(), bBuf.length);
      assertEquals(b.getOffset(), 0);
      
      for (int i = 0; i < 10; ++i)
      {
        final short[] ba = p.doValidateShortArraySize(b, i);
        if (i >  bBuf.length)
          assertTrue(ba != bBuf);
        else
          assertTrue(ba == bBuf);
        final int max = i > bBuf.length ? i : bBuf.length;
        assertEquals(ba.length, max);
        for (int j = 0; j < i; ++j)
        {  assertEquals(ba[j], 0);
        }
        assertEquals(b.getData(), ba);
        assertEquals(b.getLength(), bBuf.length);
        assertEquals(b.getOffset(), 0);
      }
    }
    
    // buf of len 5 with length set to 0:
    {
      final Buffer b = new Buffer();
      final short[] bBuf = new short[5];
      b.setData(bBuf);
      b.setLength(0);
      assertTrue(b.getData() == bBuf);
      assertEquals(b.getLength(), 0);
      assertEquals(b.getOffset(), 0);
      
      for (int i = 0; i < 10; ++i)
      {
        final short[] ba = p.doValidateShortArraySize(b, i);
        if (i >  bBuf.length)
          assertTrue(ba != bBuf);
        else
          assertTrue(ba == bBuf);
        final int max = i > bBuf.length ? i : bBuf.length;
        assertEquals(ba.length, max);
        for (int j = 0; j < i; ++j)
        {  assertEquals(ba[j], 0);
        }
        assertEquals(b.getData(), ba);
        assertEquals(b.getLength(), 0);
        assertEquals(b.getOffset(), 0);
      }
    }
    
    // it appears that getLength/setLength has nothing to do with doValidateShortArraySize.
    // doValidateShortArraySize looks like it checks the size of the buf, and reallocates it
    // if too small.
    
    // try with a non-shortarray
    {
      final Buffer b = new Buffer();
      final int[] bBuf = new int[5];
      b.setData(bBuf);
      b.setLength(0);
      assertTrue(b.getData() == bBuf);
      assertEquals(b.getLength(), 0);
      assertEquals(b.getOffset(), 0);
      
      for (int i = 0; i < 10; ++i)
      {
        final short[] ba = p.doValidateShortArraySize(b, i);
//        if (i >  bBuf.length)
//          assertTrue(ba != bBuf);
//        else
//          assertTrue(ba == bBuf);
        assertEquals(ba.length, i);
        for (int j = 0; j < i; ++j)
        {  assertEquals(ba[j], 0);
        }
        assertEquals(b.getData(), ba);
        assertEquals(b.getLength(), 0);
        assertEquals(b.getOffset(), 0);
      }
    }
    
    // appears to simply reallocate if not a short array.
    // See if it copies existing data:
    {
      final Buffer b = new Buffer();
      final short[] bBuf = new short[] {0, 1, 2, 3, 4};
      b.setData(bBuf);
      b.setLength(0);
      assertTrue(b.getData() == bBuf);
      assertEquals(b.getLength(), 0);
      assertEquals(b.getOffset(), 0);
      
      for (int i = 0; i < 10; ++i)
      {
        final short[] ba = p.doValidateShortArraySize(b, i);
        if (i >  bBuf.length)
          assertTrue(ba != bBuf);
        else
          assertTrue(ba == bBuf);
        final int max = i > bBuf.length ? i : bBuf.length;
        assertEquals(ba.length, max);
        for (int j = 0; j < i; ++j)
        {  
          if (j < bBuf.length)
            assertEquals(ba[j], bBuf[j]);
          else
            assertEquals(ba[j], 0);
        }
        assertEquals(b.getData(), ba);
        assertEquals(b.getLength(), 0);
        assertEquals(b.getOffset(), 0);
      }
    }
    
    // it does copy existing data.

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        if ( null == firstItem )
        {
            wait();
        }
        
        Buffer aBuffer = null;
        
        RTPBuffer aRTPBuffer = firstItem;
        
        firstItem = lastItem = null;
        itemCount = 0;

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            if ( null != firstItem )
            {
                firstItem.previousBuffer = null;
            }
            
            Buffer aBuffer = aRTPBuffer.buffer;
            
            aRTPBuffer.nextBuffer = null;
            aRTPBuffer.previousBuffer = null;
            aRTPBuffer.buffer = null;
            
            itemCount--;
            duration -= aBuffer.getDuration();
            
            return aBuffer;
        }
        
        return null;

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      this.stream = stream;
      // set format
      
      // read first frame to determine format
      final Buffer buffer = new Buffer();
      readFrame(buffer);
      if (buffer.isDiscard() || buffer.isEOM())
        throw new ResourceUnavailableException("Unable to read first frame");
      // TODO: catch runtime exception too?
      
      // parse jpeg
      final java.awt.Image image;
      try
      {
        image = ImageIO.read(new ByteArrayInputStream((byte []) buffer.getData(), buffer.getOffset(), buffer.getLength()));
      } catch (IOException e)
      {
        logger.log(Level.WARNING, "" + e, e);
        throw new ResourceUnavailableException("Error reading image: " + e);
      }

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      this.streamIndex = streamIndex;
    }


    public void transferData(PushSourceStream stream)
    {
      final Buffer originalBuffer = new Buffer();  // TODO: find a way to reuse buffers/avoid allocating new memory each time
      
      try
      {
        final byte[] originalBufferData = new byte[READ_BUFFER_SIZE];
        originalBuffer.setData(originalBufferData);
        int numRead = stream.read(originalBufferData, 0, originalBufferData.length);
        if (numRead < 0)
          originalBuffer.setEOM(true);
        else
          originalBuffer.setLength(numRead);        
      } catch (IOException e)
      {
        originalBuffer.setEOM(true);  // TODO
        originalBuffer.setDiscard(true);  // TODO
        originalBuffer.setLength(0);
        if (!(e instanceof InterruptedIOException))  // logging interruptions is noisy.
          logger.log(Level.WARNING, "" + e, e);
      }
      
      final List<ClonedDataSource.ClonedPushSourceStream> clonedStreams = new ArrayList<ClonedDataSource.ClonedPushSourceStream>();
      synchronized (CloneablePushDataSource.this)
      {
        for (ClonedDataSource clone : clones)
        {
          final ClonedDataSource.ClonedPushSourceStream clonedStream = (ClonedDataSource.ClonedPushSourceStream) clone.getStreams()[streamIndex];
          clonedStreams.add(clonedStream);
          
        }
      }
      
      // TODO: additional synchronization?
      try
      {
        // put a clone of the buffer in each stream's buffer queue
        for (ClonedDataSource.ClonedPushSourceStream clonedStream : clonedStreams)
        {
          clonedStream.getBufferQueue().put(originalBuffer.clone());
          
        }
        
        // notify their transfer handlers asynchronously:
        for (ClonedDataSource.ClonedPushSourceStream clonedStream : clonedStreams)

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    @Override
    public void readFrame(Buffer buffer)
    {
      Buffer b;
      try
      {
        b = xmlMovieSAXHandler.readBuffer(track);
      } catch (SAXException e)
      {

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      input.setFormat(getInputFormat());  // TODO: is this right?  JMF appears to set the format in between demux track read adnd codec process.
    
    // JMF re-uses the previous buffer
    if (getOutputBuffer(0) == null)
    {
      setOutputBuffer(0, new Buffer());
    }
    
    final Buffer buffer1 = getOutputBuffer(0);
    buffer1.setLength(0);
    buffer1.setTimeStamp(input.getTimeStamp());  // TODO: is this correct?
    buffer1.setFlags(input.getFlags());  // mgodehardt: this was missing, TODO: propagate EOM or anything else?
//    TODO: other fields to set/clear? these determined empirically
//     Seems like setting the format is a good idea.  At least some codecs (like com.sun.media.codec.audio.ulaw.DePacketizer) do not 
//    appear to set the format of their output buffer.
    if (buffer1.getFormat() == null)
      buffer1.setFormat(getDestLink(0).getDestNode().getInputFormat());
//    if (buffer1.getFormat() == null)
//      System.out.println("FORMAT NULL EVEN AFTER SET!!!!");
      //      throw new NullPointerException();
    buffer1.setSequenceNumber(input.getSequenceNumber());  // TODO: is this right?  JMF appears to be setting the sequence numbers, not the codec
    // the one thing that is wierd about the sequence numbers, is that in the case of something like a packetizers, all of the packets derived from
    // a single source buffer will have the same sequence number.

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