<box begindoc>**This is automatically generated documentation.**  Edit after the "[[#COMMENTS|COMMENTS]]" heading; changes to the main body will be lost.</box>

====== GetSSRC Element Documentation ======

===== NAME =====

**GetSSRC** -- Click element;
splits packets _possibly_ containing an SSRC field (used by the RTP protocol): this is copied it inside the packet annotation field

===== SYNOPSIS =====

GetSSRC(OFFSET)

**Ports**: 1 input, 2 outputs\\ 
**Processing**: Push\\ 
**Package**: unibo_qos\\ 

===== DESCRIPTION =====

GetSSRC has two output ports. All incoming packets _possibly_ having an SSRC field
marked up are directed to output port 0, any remaining packets are emitted on
output port 1 (since they cannot absolutely pertain to an RTP flow).


===== EXAMPLES =====

elementclass class_RTP {
     $ssrc, $dscp |
     get::GetSSRC($ssrc);
     rtp::RTPClassifier;
     set::SetIPDSCP($dscp);
     input->get[0]->rtp;
     get[1]->[1]output;
     rtp[0]->set->[0]output;
     rtp[1]->[1]output;
     }
In the above example, GetSSRC is used in combination with the [[RTPClassifier]] and [[SetIPDSCP]] elements
to hook an RTP flow and mark its packets' DSCP field.
     

===== ELEMENT HANDLERS =====


 ? **SSRC offset in bytes ((write-only))**
 ! Offset (in bytes) of the SSRC field from the beginning of the Ethernet datagram (50 bytes).
See also RFC 3550.


===== SEE ALSO =====

[[RTPClassifier]], [[SetIPDSCP]]


Generated by 'click-elem2man' from 'package/getssrc.hh' on 19/May/2006.


===== COMMENTS =====