WebRTC series-Qos series receiving and putting RTX processing

In the previous WebRTC series-Qos series receiving NACK article, the main process of parsing after receiving nack was analyzed. In WebRTC NACK , RTX there is a packet loss and retransmission strategy, and there is a certain connection between the two strategies: NACK notifies the sender of the sequence number of the packet loss through RTCP at the receiving end, and the sending end receives the RTCP packet after a period of time. A series of analysis processing, find the packet corresponding to the lost packet sequence, and ask the sender to retransmit the packet. If the client enables RTX at this time, it will be repackaged into an RTP packet with RTX and sent, otherwise the packet will be updated and sent;