Package org.jitsi.impl.neomedia.transform

Class OriginalHeaderBlockTransformEngine

java.lang.Object

org.jitsi.impl.neomedia.transform.SinglePacketTransformer

org.jitsi.impl.neomedia.transform.SinglePacketTransformerAdapter

org.jitsi.impl.neomedia.transform.OriginalHeaderBlockTransformEngine

All Implemented Interfaces:

PacketTransformer, TransformEngine

public class OriginalHeaderBlockTransformEngine
extends SinglePacketTransformerAdapter
implements TransformEngine

Appends an Original Header Block packet extension to incoming packets. Note that we currently do NOT follow the PERC format, but rather an extended backward compatible format. draft-ietf-perc-double-02 Specifically the format the we currently append is

  0                   1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  +-------------+---------------+-------------------------------+
  |  id  | len  |R|     PT      |        Sequence Number        |
  +-------------+---------------+-------------------------------+
  |                         Timestamp                           |
  +-------------------------------------------------------------+
  |                            SSRC                             |
  +-------------------------------------------------------------+

 

Author:

Boris Grozev

Constructor Summary

Constructors

Constructor	Description
OriginalHeaderBlockTransformEngine()	Initializes a new OriginalHeaderBlockTransformEngine instance.

Method Summary

Modifier and Type	Method	Description
PacketTransformer	getRTCPTransformer()	Implements TransformEngine.getRTCPTransformer().
PacketTransformer	getRTPTransformer()	Implements TransformEngine.getRTPTransformer().
RawPacket	reverseTransform(RawPacket pkt)	Implements SinglePacketTransformer.reverseTransform(RawPacket).
void	setExtensionID(int id)	Sets the ID of the abs-send-time RTP extension.
RawPacket	transform(RawPacket pkt)	Here we would re-form or remove the OHB extension to only include fields which we modified, in order to reduce the overhead.

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

close, reverseTransform, transform

Methods inherited from class java.lang.Object

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

Constructor Detail

OriginalHeaderBlockTransformEngine

public OriginalHeaderBlockTransformEngine()

Initializes a new OriginalHeaderBlockTransformEngine instance.

Method Detail

reverseTransform

public RawPacket reverseTransform(RawPacket pkt)

Implements SinglePacketTransformer.reverseTransform(RawPacket).

Overrides:

reverseTransform in class SinglePacketTransformerAdapter

Parameters:

pkt - the transformed packet to be restored.

Returns:

the restored packet.

transform

public RawPacket transform(RawPacket pkt)

Here we would re-form or remove the OHB extension to only include fields which we modified, in order to reduce the overhead.

Overrides:

transform in class SinglePacketTransformerAdapter

Parameters:

pkt - the packet to be transformed.

Returns:

the transformed packet.

getRTPTransformer

public PacketTransformer getRTPTransformer()

Implements TransformEngine.getRTPTransformer().

Specified by:

getRTPTransformer in interface TransformEngine

Returns:

the PacketTransformer for RTP packets

getRTCPTransformer

public PacketTransformer getRTCPTransformer()

Implements TransformEngine.getRTCPTransformer(). This TransformEngine does not transform RTCP packets.

Specified by:

getRTCPTransformer in interface TransformEngine

Returns:

the PacketTransformer for RTCP packets

setExtensionID

public void setExtensionID(int id)

Sets the ID of the abs-send-time RTP extension. Set to -1 to effectively disable this transformer.

Parameters:

id - the ID to set.