[opus] FEC monitoring

[Julien Chavanton]

Hi,

I would like to monitor FEC usage in order to include it in RTCP EX or
calculate MOS estimation, etc.

However the Opus codec library does not seem to expose such information.
"Was LBRR found and used or was it PLC ?"

I saw in WebRTC that they are using a technique to parse the "frame header"

WebRtcOpus_PacketHasFec()

It this something that is supported ?
What would you recommend

Regards
Julien
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