This is a Google's Transport-CC Implemention In go, which can be used to evaluate bandwidth.
rtp_transport_controller_send.go provied some Interfaces. You can use Function OnTransportFeedback to get a bandwith from tcc algorithm, but you have to do three things to make sure the result correctly before.
- First, you must input rtcp packet which is defined as rtcp.TransportLayerCC.
- Second, When you receive RR Rtcp Packet, you should parse this packet to get rtt and SetRtt.
- When you send rtp packet, you must AddPacket.
- rtp_transport_controller_send.go
RtpTransportControllerSend include TransportFeedbackAdapter and GoogCcNetworkController. NewRtpTransportControllerSend can create a object, we can use this object to make bandwith.
- transport_feedback_adapter.go
TransportFeedbackAdapter's history save the sending packet record. While receiving rtcp packet, return a vector of packet_result and feedback time.
- goog_cc_network_control.go
Congestion control module include a delay based rate estimator and window flow based rate estimator. There is a difference that webrtc use a ProbeEstimator to make Bandwidth detection in the beginning, but we First input 450000 as probe rate.
- delay_based_bwe.go
DelayBasedBwe include three modules, rate_control_, active_delay_detector_ and video_inter_arrival.
- inter_arrival.go
InterArrival provide a arrival-time model, calculate delta between package groups in instead of single packet.
- trendline_estimator.go
TrendlineEstimator provide a over-use detector to maintain a status of current network.
- aimd_rate_control.go
AimdRateControl make a reasonable bandwidth from status of current network.
- acknowledged_bitrate_estimator.go
AcknowledgeBitrateEstimator calcalute a window flow bandwidth rate.
- see Figure FlowChart.png
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