/*
* @(#)DatagramForwarder.java
* Created: 2 Nov 2007
* Version: 1.0
* Copyright (c) 2005-2006, University of Manchester All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer. Redistributions in binary
* form must reproduce the above copyright notice, this list of conditions and
* the following disclaimer in the documentation and/or other materials
* provided with the distribution. Neither the name of the University of
* Manchester nor the names of its contributors may be used to endorse or
* promote products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package javax.media.protocol.recorded;
import java.io.IOException;
import java.net.DatagramPacket;
import java.util.HashMap;
import java.util.LinkedList;
import javax.media.Buffer;
import javax.media.Format;
import javax.media.format.AudioFormat;
import javax.media.format.UnsupportedFormatException;
import javax.media.format.VideoFormat;
import javax.media.protocol.BufferTransferHandler;
import javax.media.protocol.ContentDescriptor;
import javax.media.protocol.PushBufferStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import rtspd.RTPHeader;
/**
* Forwards received datagrams
*
* @author Andrew G D Rowley
* @version 1.0
*/
public class DatagramForwarder implements PushBufferStream {
static final Logger log = LoggerFactory.getLogger(DatagramForwarder.class);
private LinkedList<byte[]> queue = new LinkedList<byte[]>();
private boolean done = false;
private BufferTransferHandler transferHandler = null;
private Format format = null;
private static final HashMap<Integer, Format> FORMAT_MAP =
new HashMap<Integer, Format>();
static {
FORMAT_MAP.put(0, new AudioFormat(AudioFormat.ULAW_RTP, 8000, 16, 1));
FORMAT_MAP.put(26, new VideoFormat("jpeg/rtp"));
FORMAT_MAP.put(31, new VideoFormat("h261/rtp"));
FORMAT_MAP.put(32, new VideoFormat("mpeg/rtp"));
FORMAT_MAP.put(34, new VideoFormat("h263/rtp"));
FORMAT_MAP.put(42, new VideoFormat("h263-1998/rtp"));
FORMAT_MAP.put(77, new VideoFormat("h261as/rtp"));
FORMAT_MAP.put(84, new AudioFormat(AudioFormat.ULAW_RTP, 16000, 16, 1));
FORMAT_MAP.put(112, new AudioFormat(AudioFormat.LINEAR, 16000,
16, 1, AudioFormat.BIG_ENDIAN, AudioFormat.SIGNED));
}
/**
* Set the packet type
* @param packetType The packet type to set
* @throws UnsupportedFormatException
*/
public void setFormat(int packetType) throws UnsupportedFormatException {
format = getFormat(packetType);
}
private Format getFormat(int type) throws UnsupportedFormatException {
Format format = FORMAT_MAP.get(type);
if (format == null) {
throw new UnsupportedFormatException(
"No format for RTP type " + type, format);
}
return format;
}
/**
*
* @see javax.media.protocol.PushBufferStream#read(javax.media.Buffer)
*/
public void read(Buffer buffer) {
if (done) {
buffer.setDiscard(true);
buffer.setEOM(true);
return;
}
byte[] data = null;
synchronized (queue) {
if (queue.isEmpty()) {
buffer.setDiscard(true);
buffer.setEOM(false);
return;
}
data = queue.removeFirst();
}
try {
RTPHeader header = new RTPHeader(data, 0, data.length);
buffer.setData(data);
buffer.setOffset(RTPHeader.SIZE);
buffer.setLength(data.length - RTPHeader.SIZE);
buffer.setTimeStamp(header.getTimestamp());
buffer.setSequenceNumber(header.getSequence());
buffer.setFormat(format);
int flags = Buffer.FLAG_RTP_TIME;
if (header.getMarker() == 1) {
flags = flags | Buffer.FLAG_RTP_MARKER;
}
buffer.setFlags(flags);
} catch (IOException e) {
log.error("Error...", e);
buffer.setDiscard(true);
}
}
/**
*
* @see javax.media.protocol.PushBufferStream#setTransferHandler(
* javax.media.protocol.BufferTransferHandler)
*/
public void setTransferHandler(BufferTransferHandler transferHandler) {
this.transferHandler = transferHandler;
}
/**
*
* @see javax.media.protocol.SourceStream#endOfStream()
*/
public boolean endOfStream() {
return done;
}
/**
*
* @see javax.media.protocol.SourceStream#getContentDescriptor()
*/
public ContentDescriptor getContentDescriptor() {
return new ContentDescriptor(ContentDescriptor.RAW_RTP);
}
/**
*
* @see javax.media.protocol.SourceStream#getContentLength()
*/
public long getContentLength() {
return LENGTH_UNKNOWN;
}
/**
*
* @see javax.media.Controls#getControl(java.lang.String)
*/
public Object getControl(String arg0) {
return null;
}
/**
*
* @see javax.media.Controls#getControls()
*/
public Object[] getControls() {
return new Object[0];
}
/**
* Closes the stream
*
*/
public void close() {
done = true;
}
/**
* Adds a packet to the queue
* @param packet The packet to add
*/
public void handlePacket(DatagramPacket packet) {
if ((transferHandler != null) && !done) {
if (packet.getLength() >= 20) {
byte[] data = new byte[packet.getLength()];
System.arraycopy(packet.getData(),
packet.getOffset(), data, 0, data.length);
synchronized (queue) {
queue.addLast(data);
}
transferHandler.transferData(this);
}
}
}
/**
*
* @see javax.media.protocol.PushBufferStream#getFormat()
*/
public Format getFormat() {
return format;
}
}