Sent as a response to offerData media event during renegotiation Maps contain only information about current peer's sendonly tracks. The "mid" is an identifier used to associate an RTP packet with an MLine from the SDP offer/answer.
offerData
sendonly
The value of the sessionDescription.sdp
sessionDescription.sdp
Maps track_id to its bitrate. The track_id in the TrackBitrates message is ignored (we use the map key), so it can be ommited.
Sent as a response to
offerData
media event during renegotiation Maps contain only information about current peer'ssendonly
tracks. The "mid" is an identifier used to associate an RTP packet with an MLine from the SDP offer/answer.