RFC Errata
RFC 5109, "RTP Payload Format for Generic Forward Error Correction", December 2007
Source of RFC: avt (rai)
Errata ID: 3461
Status: Held for Document Update
Type: Editorial
Publication Format(s) : TEXT
Reported By: Adam Li
Date Reported: 2013-01-16
Held for Document Update by: Gonzalo Camarillo
Section 10.2 says:
In Figure 15, +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0|0|0|0|0 0 0 0|0|0 0 1 1 0 0 1|0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ .... P rec.: 0 [0 XOR 0 XOR 0 XOR 0] X rec.: 0 [0 XOR 0 XOR 0 XOR 0] CC rec.: 0 [0 XOR 0 XOR 0 XOR 0] M rec.: 0 [1 XOR 0 XOR 1 XOR 0]
It should say:
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0|0|0|0|0 0 0 0|1|0 0 1 1 0 0 1|0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ .... P rec.: 0 [0 XOR 0] X rec.: 0 [0 XOR 0] CC rec.: 0 [0 XOR 0] M rec.: 1 [1 XOR 0]
Notes:
These fields (P rec., X rec., CC rec., and M rec.) should be calculated from the packets that are protected at Level 0 (as specified). The specification text in previous sections are all correct. This change here is only a typo in the examples, but correcting it helps to understand the specification.