Package org.jitsi.impl.neomedia.transform.srtp

Class SRTPTransformer

java.lang.Object

org.jitsi.impl.neomedia.transform.SinglePacketTransformer

org.jitsi.impl.neomedia.transform.srtp.SRTPTransformer

All Implemented Interfaces:

PacketTransformer

public class SRTPTransformer
extends SinglePacketTransformer

SRTPTransformer implements PacketTransformer and provides implementations for RTP packet to SRTP packet transformation and SRTP packet to RTP packet transformation logic. It will first find the corresponding SRTPCryptoContext for each packet based on their SSRC and then invoke the context object to perform the transformation and reverse transformation operation.

Author:

Bing SU (nova.su@gmail.com)

Constructor Summary

Constructors

Constructor	Description
SRTPTransformer(org.jitsi.srtp.SrtpContextFactory factory)	Initializes a new SRTPTransformer instance.
SRTPTransformer(org.jitsi.srtp.SrtpContextFactory forwardFactory, org.jitsi.srtp.SrtpContextFactory reverseFactory)	Constructs a SRTPTransformer object.

Method Summary

Modifier and Type	Method	Description
void	close()	Closes this SRTPTransformer and the underlying transform engines.It closes all stored crypto contexts.
RawPacket	reverseTransform(RawPacket pkt)	Reverse-transforms a specific packet (i.e.
void	setContextFactory(org.jitsi.srtp.SrtpContextFactory factory, boolean forward)	Sets a new key factory when key material has changed.
RawPacket	transform(RawPacket pkt)	Transforms a specific packet.

Methods inherited from class org.jitsi.impl.neomedia.transform.SinglePacketTransformer

reverseTransform, transform

Methods inherited from class java.lang.Object

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

Constructor Detail

SRTPTransformer

public SRTPTransformer(org.jitsi.srtp.SrtpContextFactory factory)

Initializes a new SRTPTransformer instance.

Parameters:

factory - the context factory to be used by the new instance for both directions.

SRTPTransformer

public SRTPTransformer(org.jitsi.srtp.SrtpContextFactory forwardFactory,
                       org.jitsi.srtp.SrtpContextFactory reverseFactory)

Constructs a SRTPTransformer object.

Parameters:

forwardFactory - The associated context factory for forward transformations.

reverseFactory - The associated context factory for reverse transformations.

Method Detail

setContextFactory

public void setContextFactory(org.jitsi.srtp.SrtpContextFactory factory,
                              boolean forward)

Sets a new key factory when key material has changed.

Parameters:

factory - The associated context factory for transformations.

forward - true if the supplied factory is for forward transformations, false for the reverse transformation factory.

close

public void close()

Closes this SRTPTransformer and the underlying transform engines.It closes all stored crypto contexts. It deletes key data and forces a cleanup of the crypto contexts.

Specified by:

close in interface PacketTransformer

Overrides:

close in class SinglePacketTransformer

reverseTransform

public RawPacket reverseTransform(RawPacket pkt)

Reverse-transforms a specific packet (i.e. transforms a transformed packet back).

Specified by:

reverseTransform in class SinglePacketTransformer

Parameters:

pkt - the transformed packet to be restored

Returns:

the restored packet

transform

public RawPacket transform(RawPacket pkt)

Transforms a specific packet.

Specified by:

transform in class SinglePacketTransformer

Parameters:

pkt - the packet to be transformed

Returns:

the transformed packet