RTCRemoteOutboundRtpStreamStats

BaselineWidely available *

This feature is well established and works across many devices and browser versions. It’s been available across browsers since May 2021.

* Some parts of this feature may have varying levels of support.

TheRTCRemoteOutboundRtpStreamStats dictionary of theWebRTC API is used to report statistics from a remote endpoint about its outbound RTP stream.This will correspond to an inbound stream that is currently being received by the localRTCPeerConnection object.

The statistics can be obtained by iterating theRTCStatsReport returned byRTCPeerConnection.getStats() until you find a report with thetype ofremote-outbound-rtp.

Instance properties

Remote outbound specific statistics

localIdOptional: A string which is used to find the localRTCInboundRtpStreamStats object that shares the samesynchronization source (SSRC).
remoteTimestampOptional: ADOMHighResTimeStamp specifying the timestamp (on the remote device) at which the statistics in theRTCRemoteOutboundRtpStreamStats object were sent by the remote endpoint. This is different from thetimestamp; it represents the time at which the object's statistics were received or generated by the local endpoint.
reportsSentOptional Experimental: A positive integer indicating the total number ofRTCP Sender Report (SR) blocks sent for thissynchronization source (SSRC).
roundTripTimeMeasurementsOptionalExperimental: A positive number that represents the total number of valid round trip time measurements received for this synchronization source (SSRC).
totalRoundTripTimeOptionalExperimental: A number indicating the cumulative sum of all round trip time measurements since the beginning of the session, in seconds.The average round trip time can be computed by dividingtotalRoundTripTime by roundTripTimeMeasurements.

Sent RTP stream statistics

bytesSentOptional: A positive integer indicating the total number of bytes sent for this SSRC, including retransmissions.
packetsSentOptional: A positive integer indicating the total number of RTP packets sent for this SSRC, including retransmissions.

Common RTP stream statistics

codecIdOptional: A string that uniquely identifies the object that was inspected to produce theRTCCodecStats report associated with thisRTP stream.
kind: A string indicating whether theMediaStreamTrack associated with the stream is an audio or a video track.
ssrc: A positive integer that identifies the synchronization source (SSRC) of the RTP packets in this stream.
transportIdOptional: A string that uniquely identifies the object that was inspected to produce theRTCTransportStats report associated with this RTP stream.

Common instance properties

The following properties are common to all WebRTC statistics objects.

id: A string that uniquely identifies the object that is being monitored to produce this set of statistics.
timestamp: ADOMHighResTimeStamp object indicating the time at which the sample was taken for this statistics object.
type: A string with the value"remote-outbound-rtp", indicating the type of statistics that the object contains.

Usage notes

TheRTCRemoteOutboundRtpStreamStats object'sremoteTimestamp property provides statistics based on the received data's NTP timestamp taken from anRTCP Sender Report (SR) block.Be aware that the remote clock may not be synchronized with the local clock (either in current time or speed at which time elapses).