The RTCStats dictionary is the basic statistics object used by WebRTC's statistics monitoring model, providing the properties required of all statistics data objects.

Specific classes of statistic are defined as dictionaries based on RTCStats. For example, statistics about a received RTP stream are represented by RTCReceivedRtpStreamStats.

id

A string which uniquely identifies the object which was inspected to produce this object based on RTCStats.

timestamp

A DOMHighResTimeStamp object indicating the time at which the sample was taken for this statistics object.

type

A string indicating the type of statistics the object contains.

The various dictionaries that are used to define the contents of the objects that contain each of the various types of statistics for WebRTC are structured in such a way that they build upon the core RTCStats dictionary, each layer adding more relevant information.

• RTCStats is the foundation of all WebRTC statistics objects
  • RTCRtpStreamStats adds to RTCStats information that applies to all RTP endpoints (that is, both local and remote endpoints, and regardless of whether the endpoint is a sender or a receiver)
    • RTCReceivedRtpStreamStats further adds statistics measured at the receiving end of an RTP stream, regardless of whether it's local or remote.
      • RTCInboundRtpStreamStats contains statistics that can only be measured on a receiver at the local end of the RTP connection.
      • RTCRemoteInboundRtpStreamStats contains statistics relevant to the remote receiving end of an RTP stream — usually computed by combining local data with data received via an RTCP RR or XR block.
    • RTCSentRtpStreamStats offers statistics related to the sending end of an RTP stream.
      • RTCOutboundRtpStreamStats contains statistics about the local sending endpoint of an RTP stream.
      • RTCRemoteOutboundRtpStreamStats holds statistics related to the remote sending end an RTP stream.