LocalRender
BitrateController
NACK bitrate
Capture
Remote Render
AVSync
Decoder
Sender
Fec rate
RTCP NACK
Paced Sender
FEC Decoder
RTCP REMB
Receiver
UDP socket
Render Smoother
Encode &Fragmentation
Encoder bitrate
RTP/RTCP
Network（接收端反馈）
MediaOptimize(DropFrame)
FECEncoder
RTCP RTPFB
CC@Tx
RTCP RR
CC@Rx
JitterBuffer
