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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

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.

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