WebRTC Statistics API - Web APIs
rtcaudioreceiverstats or rtcvideoreceiverstats rtcaudiohandlerstats or rtcvideohandlerstats rtcmediahandlerstats rtcstats remote-candidate statistics about a remote ice candidate associated with the connection's rtcicetransports.
... rtcaudiosenderstats or rtcvideosenderstats rtcaudiohandlerstats or rtcvideohandlerstats rtcmediahandlerstats rtcstats stream statistics about a particular media mediastream.