ExWebRTC Endpoint

The ExWebRTC Endpoint is responsible for sending/receiving media tracks to/from a web borwser.

Architecture

TrackSender

TrackSender is responsible for observing track activity and publishing track data to the engine. In particular, it is responsible for sending Membrane.RTC.Engine.Event.TrackVariantResumed and Membrane.RTC.Engine.Event.TrackVariantPaused events, and replying to Membrane.KeyframeRequestEvent.

VariantTracker

A browser can pause sending some variant when e.g. it doesn't have enough bandwidth. This fact is not communicated to the server. VariantTracker is responsible for tracking variant activity i.e. whether it is still active.

TrackReceiver

TrackReceiver is responsible for receiving a track from the engine. In particular, it is responsible for sending the Membrane.RTC.Engine.Event.RequestTrackVariant event, forwarding keyframe requests from the browser to the TrackSender and repairing RTP packets after switching track variants.

NoOpConnectionAllocator

NoOpConnectionAllocator always grants bandwidth requested by TrackReceiver