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Rtcp sr and rr for rtc play
For WebRTC downlink, add:
- Sending RTCP SR.
- Receiving and processing RTCP RR to calculate RTT.
- Retransmission of NACK based on RTT.
The main functionality is to calculate RTT in the downlink, which prevents unnecessary retransmissions within a time period less than RTT, avoiding unnecessary retransmissions.
TRANS_BY_GPT3