Package org.jitsi.impl.neomedia.transform

Class REDTransformEngine

java.lang.Object

org.jitsi.impl.neomedia.transform.REDTransformEngine

All Implemented Interfaces:

PacketTransformer, TransformEngine

public class REDTransformEngine
extends Object
implements TransformEngine, PacketTransformer

Implements a PacketTransformer and TransformEngine for RED (RFC2198).

Author:

Boris Grozev

Constructor Summary

Constructors

Constructor	Description
REDTransformEngine()	Initializes a new REDTransformEngine instance.
REDTransformEngine(byte incomingPT, byte outgoingPT)	Initializes a new REDTransformEngine instance.

Method Summary

Modifier and Type	Method	Description
void	close()	Closes this PacketTransformer i.e.
PacketTransformer	getRTCPTransformer()	Gets the PacketTransformer for RTCP packets.
PacketTransformer	getRTPTransformer()	Gets the PacketTransformer for RTP packets.
RawPacket[]	reverseTransform(RawPacket[] pkts)	Reverse-transforms each packet in an array of packets.
void	setIncomingPT(byte incomingPT)	Sets the RED payload type for incoming red packets.
void	setOutgoingPT(byte outgoingPT)	Sets the RED payload type for outgoing red packets.
RawPacket[]	transform(RawPacket[] pkts)	Transforms each packet in an array of packets.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

REDTransformEngine

public REDTransformEngine(byte incomingPT,
                          byte outgoingPT)

Initializes a new REDTransformEngine instance.

Parameters:

incomingPT - the RED payload type number for incoming packets.

outgoingPT - the RED payload type number for outgoing packets.

REDTransformEngine

public REDTransformEngine()

Initializes a new REDTransformEngine instance.

Method Detail

setIncomingPT

public void setIncomingPT(byte incomingPT)

Sets the RED payload type for incoming red packets.

Parameters:

incomingPT - the payload type to set.

setOutgoingPT

public void setOutgoingPT(byte outgoingPT)

Sets the RED payload type for outgoing red packets.

Parameters:

outgoingPT - the payload type to set.

close

public void close()

Closes this PacketTransformer i.e. releases the resources allocated by it and prepares it for garbage collection.

Specified by:

close in interface PacketTransformer

reverseTransform

public RawPacket[] reverseTransform(RawPacket[] pkts)

Reverse-transforms each packet in an array of packets. Null values must be ignored. Reverse-transform a RED (RFC2198) packet.

Specified by:

reverseTransform in interface PacketTransformer

Parameters:

pkts - the transformed packets to be restored.

Returns:

the restored packets.

transform

public RawPacket[] transform(RawPacket[] pkts)

Transforms each packet in an array of packets. Null values must be ignored. Encapsulates the packets in pkts with RED (RFC2198). Effectively inserts the following 1-byte RED header right after the RTP header (where "Block PT" is the payload type of the original packet) and changes the payload type of the packet to outgoingPT 0 1 2 3 4 5 6 7 +-+-+-+-+-+-+-+-+ |0| Block PT | +-+-+-+-+-+-+-+-+

Specified by:

transform in interface PacketTransformer

Parameters:

pkts - the packets to be transformed

Returns:

the transformed packets

getRTPTransformer

public PacketTransformer getRTPTransformer()

Gets the PacketTransformer for RTP packets. Return the single PacketTransformer for this TransformEngine

Specified by:

getRTPTransformer in interface TransformEngine

Returns:

the PacketTransformer for RTP packets

getRTCPTransformer

public PacketTransformer getRTCPTransformer()

Gets the PacketTransformer for RTCP packets. We don't touch RTCP

Specified by:

getRTCPTransformer in interface TransformEngine

Returns:

the PacketTransformer for RTCP packets