webrtc stats

Identifiers for WebRTC's Statistics API W3C Candidate Recommendation Draft 25 September 2025 More details about this document This version: https://www.w3.org/TR/2025/CRD-webrtc-stats-20250925/ Latest published version: https://www.w3.org/TR/webrtc-stats/ Latest editor's draft: https://w3c.github.io/webrtc-stats/ History: https://www.w3.org/standards/history/webrtc-stats/ Commit history Test suite: https://github.com/web-platform-tests/wpt/tree/master/webrtc-stats Implementation report: https://wpt.fyi/webrtc-stats Editors: Harald Alvestrand ( Google ) Varun Singh ( daily.co ) Henrik Boström ( Google ) Feedback: GitHub w3c/webrtc-stats ( pull requests , new issue , open issues ) [email protected] with subject line [webrtc-stats] … message topic … ( archives ) Participate Mailing list Copyright © 2014-2025 World Wide Web Consortium . W3C ® liability , trademark and permissive document license rules apply. Abstract This document defines a set of WebIDL objects that allow access to the statistical information about a RTCPeerConnection . These objects are returned from the getStats API that is specified in [ WEBRTC ]. Status of This Document This section describes the status of this document at the time of its publication. A list of current W3C publications and the latest revision of this technical report can be found in the W3C standards and drafts index . Since the previous publication as a Candidate Recommendation, the stats objects were significantly reorganized to better match the underlying data sources. In addition, the networkType property was deprecated for preserving privacy, and the statsended event was removed as no longer needed. This document was published by the Web Real-Time Communications Working Group as a Candidate Recommendation Draft using the Recommendation track . Publication as a Candidate Recommendation does not imply endorsement by W3C and its Members. A Candidate Recommendation Draft integrates changes from the previous Candidate Recommendation that the Working Group intends to include in a subsequent Candidate Recommendation Snapshot. This is a draft document and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to cite this document as other than a work in progress. This document was produced by a group operating under the W3C Patent Policy . W3C maintains a public list of any patent disclosures made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent. An individual who has actual knowledge of a patent that the individual believes contains Essential Claim(s) must disclose the information in accordance with section 6 of the W3C Patent Policy . This document is governed by the 18 August 2025 W3C Process Document . Table of Contents Abstract Status of This Document 1. Introduction 2. Conformance 3. Terminology 4. Basic concepts 4.1 Guidelines for design of stats objects 4.2 Guidelines for implementing stats objects 4.3 Lifetime considerations for monitored objects 4.4 Guidelines for getStats () results caching/throttling 5. Maintenance procedures for stats object types 5.1 Adding new stats objects 6. Procedures for mitigating privacy concerns 6.1 Limiting exposure of hardware capabilities 7. RTCStatsType 7.1 RTCStatsType enum 8. Stats dictionaries 8.1 The RTP statistics hierarchy 8.2 RTCRtpStreamStats dictionary 8.3 RTCCodecStats dictionary 8.4 RTCReceivedRtpStreamStats dictionary 8.5 RTCInboundRtpStreamStats dictionary 8.6 RTCRemoteInboundRtpStreamStats dictionary 8.7 RTCSentRtpStreamStats dictionary 8.8 RTCOutboundRtpStreamStats dictionary 8.9 RTCQualityLimitationReason enum 8.10 RTCRemoteOutboundRtpStreamStats dictionary 8.11 RTCMediaSourceStats dictionary 8.12 RTCAudioSourceStats dictionary 8.13 RTCVideoSourceStats dictionary 8.14 RTCAudioPlayoutStats dictionary 8.15 RTCPeerConnectionStats dictionary 8.16 RTCDataChannelStats dictionary 8.17 RTCTransportStats dictionary 8.18 RTCIceCandidateStats dictionary 8.19 RTCIceCandidatePairStats dictionary 8.19.1 RTCStatsIceCandidatePairState enum 8.20 RTCCertificateStats dictionary 9. Examples 9.1 Example of a stats application 10. Security and Privacy Considerations A. Summary of WebRTC stats fields per type B. Acknowledgements C. References C.1 Normative references C.2 Informative references 1. Introduction This section is non-normative. Audio, video, or data packets transmitted over a peer-connection can be lost, and experience varying amounts of network delay. A web application implementing WebRTC expects to monitor the performance of the underlying network and media pipeline. This document defines the statistic identifiers used by the web application to extract metrics from the user agent. 2. Conformance As well as sections marked as non-normative, all authoring guidelines, diagrams, examples, and notes in this specification are non-normative. Everything else in this specification is normative. The key words MAY , MUST , MUST NOT , and SHOULD in this document are to be interpreted as described in BCP 14 [ RFC2119 ] [ RFC8174 ] when, and only when, they appear in all capitals, as shown here. This specification defines the conformance criteria that applies to a single product: the user agent . Implementations that use ECMAScript to implement the objects defined in this specification MUST implement them in a manner consistent with the ECMAScript Bindings defined in the Web IDL specification [ WEBIDL ], as this document uses that specification and terminology. This specification does not define what objects a conforming implementation should generate. Specifications that refer to this specification have the need to specify conformance. They should put in their document text like this (EXAMPLE ONLY): An implementation MUST support generating statistics for the type RTCInboundRtpStreamStats , with members packetsReceived , bytesReceived , packetsLost , and jitter . It MUST support generating statistics for the type RTCOutboundRtpStreamStats , with members packetsSent , bytesSent . For all subclasses of RTCRtpStreamStats , it MUST include ssrc and kind . When stats exist for both sides of a connection, in the form of an " inbound-rtp " / " remote-outbound-rtp " pair or an " outbound-rtp " / " remote-inbound-rtp " pair, the members remoteId and localId MUST also be present. It MAY support generating other stats. 3. Terminology The terms RTCPeerConnection , RTCDataChannel , RTCDtlsTransport , RTCDtlsTransportState , RTCIceTransport , RTCIceRole , RTCIceTransportState , RTCDataChannelState , RTCIceCandidateType , RTCStats , RTCCertificate are defined in [ WEBRTC ]. RTCPriorityType is defined in [ WEBRTC-PRIORITY ]. The term RTP stream is defined in [ RFC7656 ]. The terms Synchronization Source (SSRC), RTCP Sender Report (SR), RTCP Receiver Report (RR) are defined in [ RFC3550 ]. The term RTCP Extended Report (XR) is defined in [ RFC3611 ]. An audio sample refers to having a sample in any channel of an audio track - if multiple audio channels are used, metrics based on samples do not increment at a higher rate, simultaneously having samples in multiple channels counts as a single sample. 4. Basic concepts The basic object of the stats model is the stats object . The following terms are defined to describe it: Monitored object An internal object that keeps a set of data values. Most monitored objects are object defined in the WebRTC API; they may be thought of as being internal properties of those objects. Stats object This is a set of values, copied out from a monitored object at a specific moment in time. It is returned as a WebIDL dictionary through the getStats API call. Stats object reference A monitored object has a stable identifier id , which is reflected in all stats objects produced from the monitored object. Stats objects may contain references to other stats objects using this id value. In a stats object , these references are represented by a DOMString containing id value of the referenced stats object. All stats object references have type DOMString and member names ending in Id , or they have type sequence< DOMString > and member names ending in Ids . Stats value Refers to a single value within a stats object. A monitored object changes the values it contains continuously over its lifetime, but is never visible through the getStats API call. A stats object, once returned, never changes. The stats API is defined in [ WEBRTC ]. It is defined to return a collection of stats object s, each of which is a dictionary inheriting directly or indirectly from the RTCStats dictionary. This API is normatively defined in [ WEBRTC ], but is reproduced here for ease of reference. WebIDL dictionary RTCStats { required DOMHighResTimeStamp timestamp ; required RTCStatsType type ; required DOMString id ; }; Timestamps are expressed with DOMHighResTimeStamp [ HIGHRES-TIME ], and are defined as Performance . timeOrigin + Performance . now () at the time the information is collected. 4.1 Guidelines for design of stats objects When introducing a new stats object, the following principles should be followed: An RTCStats object should correspond to an object defined in the specification it supports. The object MUST define a new value in the RTCStatsType enum, and MUST define the syntax of the stats object it returns either by reference to an existing sub-dictionary of RTCStats or by defining a new sub-dictionary of RTCStats . All members of the new object need to have definitions that make them consistently implementable. References to other specifications are a good way of doing this. All members need to have defined behavior for what happens before the thing it counts happens, or when the information it's supposed to show is not available. Usually, this will be "start at zero" or "do not populate the value". The new members of the stats dictionary need to be named according to standard practice (camelCase), as per [ API-DESIGN-PRINCIPLES ]. Names ending in Id (such as transportId ) are always a stats object reference ; names ending in Ids are always of type sequence< DOMString >, where each DOMString is a stats object reference . If the natural name for a stats value would end in id (such as when the stats value is an in-protocol identifier for the monitored object), the recommended practice is to let the name end in identifier , such as dataChannelIdentifier . Stats are sampled by Javascript. In general, an application will not have overall control over how often stats are sampled, and the implementation cannot know what the intended use of the stats is. There is, by design, no control surface for the application to influence how stats are generated. Therefore, letting the implementation compute "average" rates is not a good idea, since that implies some averaging time interval that can't be set beforehand. Instead, the recommended approach is to count the number of measurements of a value and sum the measurements given even if the sum is meaningless in itself; the JS application can then compute averages over any desired time interval by calling getStats() twice, taking the difference of the two sums and dividing by the difference of the two counts. For stats that are measured against time, such as byte counts, no separate counter is needed; one can instead divide by the difference in the timestamps. 4.2 Guidelines for implementing stats objects When implementing stats objects, the following guidelines should be adhered to: When a feature is not implemented on the platform, omit the dictionary member that is tracking usage of the feature. When a feature is not applicable to an instance of an object (for example audioLevel on a video stream), it shall not exist . Do NOT report a count of zero, -1 or "empty string". When a feature is an instantaneous measure and it has not yet been sampled, it shall not exist . When a feature is a cumulative measure and it has not been sampled yet, but is likely to increment in the future, report a count of zero. This allows subtraction of such features without additional checks for existence. 4.3 Lifetime considerations for monitored objects The object descriptions will say what the lifetime of a monitored object from the perspective of stats is. When a monitored object is deleted , it no longer appears in stats; until this happens, it will appear. This may or may not correspond to the actual lifetime of an object in an implementation; what matters for this specification is what appears in stats. If a monitored object can only exist in a few instances over the lifetime of a RTCPeerConnection , it may be simplest to consider it "eternal" and never delete it from the set of objects reported on in stats. This type of object will remain visible until the RTCPeerConnection is no longer available; it is also visible in getStats () after pc.close(). This is the default when no lifetime is mentioned in its specification. Objects that might exist in many instances over time should have a defined time at which they are deleted , at which time they stop appearing in subsequent calls to getStats () . When an object is deleted , we can guarantee that no subsequent getStats () call will contain a stats object reference that references the deleted object. We also guarantee that the stats id of the deleted object will never be reused for another object. This ensures that an application that collects stats object s for deleted monitored object s will always be able to uniquely identify the object pointed to in the result of any getStats () call. 4.4 Guidelines for getStats () results caching/throttling A call to getStats () touches many components of WebRTC and may take significant time to execute. The implementation may or may not utilize caching or throttling of getStats () calls for performance benefits, however any implementation must adhere to the following: When the state of the RTCPeerConnection visibly changes as a result of an API call, a promise resolving or an event firing, subsequent new getStats () calls must return up-to-date dictionaries for the affected objects. When a stats object is deleted , subsequent getStats () calls MUST NOT return stats for that monitored object . 5. Maintenance procedures for stats object types 5.1 Adding new stats objects This document specifies the interoperable stats object types. Proposals for new object types may be made in the editors draft maintained on GitHub . New standard types may appear in future revisions of the W3C Recommendation. If a need for a new stats object type or stats value within a stats object is found, an issue should be raised on Github , and a review process will decide on whether the stat should be added to the editors draft or not. A pull request for a change to the editors draft may serve as guidance for the discussion, but the eventual merge is dependent on the review process. While the WebRTC WG exists, it will serve as the review body; once it has disbanded, the W3C will have to establish appropriate review. The level of review sought is that of the IETF process' "expert review", as defined in [ RFC5226 ] section 4.1. The documentation needed includes the names of the new stats, their data types, and the definitions they are based on, specified to a level that allows interoperable implementation. The specification may consist of references to other documents. Another specification that wishes to refer to a specific version (for instance for conformance) should refer to a dated version; these will be produced regularly when updates happen. 6. Procedures for mitigating privacy concerns The WebRTC's Statistics API exposes information about the system, including hardware capabilities and network characteristics. To limit the finger printing surface imposed by this API, some metrics are only exposed if allowed by the algorithms in this section. 6.1 Limiting exposure of hardware capabilities To avoid passive fingerprinting, hardware capabilities should only be exposed in capturing contexts. This is tested using the algorithm below. To check if hardware exposure is allowed , run the following steps: If the context capturing state is true, return true. Otherwise return false. 7. RTCStatsType The type member, of type RTCStatsType , indicates the type of the object that the RTCStats object represents. An object with a given type can have only one IDL dictionary type, but multiple type values may indicate the same IDL dictionary type; for example, " local-candidate " and " remote-candidate " both use the IDL dictionary type RTCIceCandidateStats . This specification is normative for the allowed values of RTCStatsType . 7.1 RTCStatsType enum WebIDL enum RTCStatsType { " codec " , " inbound-rtp " , " outbound-rtp " , " remote-inbound-rtp " , " remote-outbound-rtp " , " media-source " , " media-playout " , " peer-connection " , " data-channel " , " transport " , " candidate-pair " , " local-candidate " , " remote-candidate " , " certificate " }; The following strings are valid values for RTCStatsType : codec Statistics for a codec that is currently being used by RTP stream s being sent or received by this RTCPeerConnection object. It is accessed by the RTCCodecStats . inbound-rtp Statistics for an inbound RTP stream that is currently received with this RTCPeerConnection object. It is accessed by the RTCInboundRtpStreamStats . RTX streams do not show up as separate RTCInboundRtpStreamStats objects but affect the packetsReceived , bytesReceived , retransmittedPacketsReceived and retransmittedBytesReceived counters of the relevant RTCInboundRtpStreamStats objects. FEC streams do not show up as separate RTCInboundRtpStreamStats objects but affect the packetsReceived , bytesReceived , fecPacketsReceived and fecBytesReceived counters of the relevant RTCInboundRtpStreamStats objects. outbound-rtp Statistics for an outbound RTP stream that is currently sent with this RTCPeerConnection object. It is accessed by the RTCOutboundRtpStreamStats . When there are multiple RTP stream s connected to the same sender due to using simulcast, there will be one RTCOutboundRtpStreamStats per RTP stream , with distinct values of the ssrc member. RTX streams do not show up as separate RTCOutboundRtpStreamStats objects but affect the packetsSent , bytesSent , retransmittedPacketsSent and retransmittedBytesSent counters of the relevant RTCOutboundRtpStreamStats objects. remote-inbound-rtp Statistics for the remote endpoint's inbound RTP stream corresponding to an outbound stream that is currently sent with this RTCPeerConnection object. It is measured at the remote endpoint and reported in an RTCP Receiver Report (RR) or RTCP Extended Report (XR). It is accessed by the RTCRemoteInboundRtpStreamStats . remote-outbound-rtp Statistics for the remote endpoint's outbound RTP stream corresponding to an inbound stream that is currently received with this RTCPeerConnection object. It is measured at the remote endpoint and reported in an RTCP Sender Report (SR). It is accessed by the RTCRemoteOutboundRtpStreamStats . media-source Statistics for the media produced by a MediaStreamTrack that is currently attached to an RTCRtpSender . This reflects the media that is fed to the encoder; after getUserMedia() constraints have been applied (i.e. not the raw media produced by the camera). It is either an RTCAudioSourceStats or RTCVideoSourceStats depending on its kind . media-playout Statistics related to audio playout. It is accessed by the RTCAudioPlayoutStats . peer-connection Statistics related to the RTCPeerConnection object. It is accessed by the RTCPeerConnectionStats . data-channel Statistics related to each RTCDataChannel id. It is accessed by the RTCDataChannelStats . transport Transport statistics related to the RTCPeerConnection object. It is accessed by the RTCTransportStats . candidate-pair ICE candidate pair statistics related to the RTCIceTransport objects. It is accessed by the RTCIceCandidatePairStats . A candidate pair that is not the current pair for a transport is deleted when the RTCIceTransport does an ICE restart, at the time the state changes to " new ". The candidate pair that is the current pair for a transport is deleted after an ICE restart when the RTCIceTransport switches to using a candidate pair generated from the new candidates; this time doesn't correspond to any other externally observable event. local-candidate ICE local candidate statistics related to the RTCIceTransport objects. It is accessed by the RTCIceCandidateStats for the local candidate. A local candidate is deleted when the RTCIceTransport does an ICE restart, and the candidate is no longer a member of any non-deleted candidate pair. remote-candidate ICE remote candidate statistics related to the RTCIceTransport objects. It is accessed by the RTCIceCandidateStats for the remote candidate. A remote candidate is deleted when the RTCIceTransport does an ICE restart, and the candidate is no longer a member of any non-deleted candidate pair. certificate Information about a certificate used by an RTCIceTransport . It is accessed by the RTCCertificateStats . 8. Stats dictionaries 8.1 The RTP statistics hierarchy The dictionaries for RTP statistics are structured as a hierarchy, so that those stats that make sense in many different contexts are represented just once in IDL. The metrics exposed here correspond to local measurements and those reported by RTCP packets. Compound RTCP packets contain multiple RTCP report blocks, such as Sender Report (SR) and Receiver Report (RR) whereas a non-compound RTCP packets may contain just a single RTCP SR or RR block. The lifetime of all RTP monitored object s are tied to SSRC s. The RTCOutboundRtpStreamStats is created when the RTP sender is configured by setting a local or remote SDP answer (via setLocalDescription() or setRemoteDescription() and the signaling state returning to "stable" ). The RTCInboundRtpStreamStats is created when the first RTP packet for this SSRC is received and the remote RTP stream stats objects ( RTCRemoteInboundRtpStreamStats and RTCRemoteOutboundRtpStreamStats ) are created when the corresponding RTCP packet is first received. RTP monitored objects are deleted when the corresponding RTP sender or RTP receiver is reconfigured to remove the corresponding RTP stream. This happens for the old SSRC when the ssrc changes, a simulcast layer is dropped or the RTCRtpTransceiver 's currentDirection becomes "stopped" . The monitored object is not deleted if the transceiver is made "inactive" or if the encoding's active parameter is set to false . If an SSRC is recycled after a deletion event has happened, this is considered a new RTP monitored object and the new RTP stream stats will have reset counters and a new ID. For a given RTP stats object, its total counters must always increase, but due to changes in SSRC, simulcast layers dropping or transceivers stopping, an RTP stats object can be deleted and/or replaced by a new RTP stats object. The caller will need to be aware of this when aggregating packet counters across multiple RTP stats objects (the aggregates may decrease due to deletions). Example 1 An RTCRtpSender is sending two layers of simulcast (on SSRC=111 and SSRC=222). Two "outbound-rtp" stats objects are observed, one with SSRC=111, and the other with SSRC=222. Both objects' packet counters are increasing.

One layer is inactivated using RTCRtpSender.setParameters(). While this pauses one of the layers (its packet counter freezes), the RTP monitored objects are not deleted. The RTCRtpTransceiver is negotiated as "inactive" and the RTP monitored objects are still not deleted. When the RTCRtpTransceiver becomes "sendonly" again, the same "outbound-rtp" objects continue to be used.

Later, RTCRtpTransceiver.stop() is called. The "outbound-rtp" objects still exist but their packet counters have frozen. Renegotiation happens and the transceiver.currentDirection becomes "stopped", now both "outbound-rtp" objects have been deleted. The hierarchy is as follows: RTCRtpStreamStats : Stats that apply to any end of any RTP stream RTCReceivedRtpStreamStats : Stats measured at the receiving end of an RTP stream, known either because they're measured locally or transmitted via an RTCP Receiver Report (RR) or Extended Report (XR) block. RTCInboundRtpStreamStats : Stats that can only be measured at the local receiving end of an RTP stream . RTCRemoteInboundRtpStreamStats : Stats 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 : Stats measured at the sending end of an RTP stream , known either because they're measured locally or because they're received via RTCP, usually in an RTCP Sender Report (SR). RTCOutboundRtpStreamStats : Stats measured locally. RTCRemoteOutboundRtpStreamStats : Stats relevant to the remote sending end of an RTP stream , usually computed based on an RTCP SR . 8.2 RTCRtpStreamStats dictionary WebIDL dictionary RTCRtpStreamStats : RTCStats { required unsigned long ssrc ; required DOMString kind ; DOMString transportId ; DOMString codecId ; }; Dictionary RTCRtpStreamStats Members ssrc of type unsigned long The synchronization source (SSRC) identifier is an unsigned integer value per [ RFC3550 ] used to identify the stream of RTP packets that this stats object is describing. For outbound and inbound local, SSRC describes the stats for the RTP stream that were sent and received, respectively by those endpoints. For the remote inbound and remote outbound, SSRC describes the stats for the RTP stream that were received by and sent to the remote endpoint. kind of type DOMString Either " audio " or " video ". This MUST match the kind attribute of the related MediaStreamTrack . transportId of type DOMString It is a unique identifier that is associated to the object that was inspected to produce the RTCTransportStats associated with this RTP stream . codecId of type DOMString It is a unique identifier that is associated to the object that was inspected to produce the RTCCodecStats associated with this RTP stream . 8.3 RTCCodecStats dictionary Codecs are created when registered for an RTP transport, but only the subset of codecs that are in use (referenced by an RTP stream) are exposed in getStats() . The RTCCodecStats object is created when one or more codecId references the codec. When there no longer exists any reference to the RTCCodecStats , the stats object is deleted. If the same codec is used again in the future, the RTCCodecStats object is revived with the same id as before. Codec objects may be referenced by multiple RTP streams in media sections using the same transport, but similar codecs in different transports have different RTCCodecStats objects. Note User agents are expected to coalesce information into a single "codec" entry per payload type per transport, unless sdpFmtpLine differs per direction, in which case two entries (one for encode and one for decode) are needed. WebIDL dictionary RTCCodecStats : RTCStats { required unsigned long payloadType ; required DOMString transportId ; required DOMString mimeType ; unsigned long clockRate ; unsigned long channels ; DOMString sdpFmtpLine ; }; Dictionary RTCCodecStats Members payloadType of type unsigned long Payload type as used in RTP encoding or decoding. transportId of type DOMString The unique identifier of the transport on which this codec is being used, which can be used to look up the corresponding RTCTransportStats object. mimeType of type DOMString The codec MIME media type/subtype defined in the IANA media types registry [ IANA-MEDIA-TYPES ], e.g. video/VP8. clockRate of type unsigned long Represents the media sampling rate. channels of type unsigned long When present, indicates the number of channels (mono=1, stereo=2). sdpFmtpLine of type DOMString The "format specific parameters" field from the a=fmtp line in the SDP corresponding to the codec, if one exist s, as defined by [ RFC8829 ] ( section 5.8 ). 8.4 RTCReceivedRtpStreamStats dictionary WebIDL dictionary RTCReceivedRtpStreamStats : RTCRtpStreamStats { unsigned long long packetsReceived ; unsigned long long packetsReceivedWithEct1 ; unsigned long long packetsReceivedWithCe ; unsigned long long packetsReportedAsLost ; unsigned long long packetsReportedAsLostButRecovered ; long long packetsLost ; double jitter ; }; Dictionary RTCReceivedRtpStreamStats Members packetsReceived of type unsigned long long Total number of RTP packets received for this SSRC . This includes retransmissions. At the receiving endpoint, this is calculated as defined in [ RFC3550 ] section 6.4.1. At the sending endpoint the packetsReceived is estimated by subtracting the Cumulative Number of Packets Lost from the Extended Highest Sequence Number Received, both reported in the RTCP Receiver Report , and then subtracting the initial Extended Sequence Number that was sent to this SSRC in a RTCP Sender Report and then adding one, to mirror what is discussed in Appendix A.3 in [ RFC3550 ], but for the sender side. If no RTCP Receiver Report has been received yet, then return 0. packetsReceivedWithEct1 of type unsigned long long Total number of RTP packets received for this SSRC marked with the "ECT(1)" marking. packetsReceivedWithCe of type unsigned long long Total number of RTP packets received for this SSRC marked with the "CE" marking. packetsReportedAsLost of type unsigned long long Total number of RTP packets for which an [ RFC8888 ] section 3.1 report has been sent with a zero R bit. Only exist s if support for the "ccfb" feedback mechanism has been negotiated. packetsReportedAsLostButRecovered of type unsigned long long Total number of RTP packets for which an [ RFC8888 ] section 3.1 report has been sent with a zero R bit, but a later report for the same packet has the R bit set to 1. Only exist s if support for the "ccfb" feedback mechanism has been negotiated. packetsLost of type long long Total number of RTP packets lost for this SSRC . Calculated as defined in [ RFC3550 ] section 6.4.1. Note that because of how this is estimated, it can be negative if more packets are received than sent. jitter of type double Packet Jitter measured in seconds for this SSRC . Calculated as defined in section 6.4.1. of [ RFC3550 ]. 8.5 RTCInboundRtpStreamStats dictionary The RTCInboundRtpStreamStats dictionary represents the measurement metrics for the incoming RTP media stream. The timestamp reported in the statistics object is the time at which the data was sampled. WebIDL dictionary RTCInboundRtpStreamStats : RTCReceivedRtpStreamStats { required DOMString trackIdentifier ; DOMString mid ; DOMString remoteId ; unsigned long framesDecoded ; unsigned long keyFramesDecoded ; unsigned long framesRendered ; unsigned long framesDropped ; unsigned long frameWidth ; unsigned long frameHeight ; double framesPerSecond ; unsigned long long qpSum ; double totalDecodeTime ; double totalInterFrameDelay ; double totalSquaredInterFrameDelay ; unsigned long pauseCount ; double totalPausesDuration ; unsigned long freezeCount ; double totalFreezesDuration ; DOMHighResTimeStamp lastPacketReceivedTimestamp ; unsigned long long headerBytesReceived ; unsigned long long packetsDiscarded ; unsigned long long fecBytesReceived ; unsigned long long fecPacketsReceived ; unsigned long long fecPacketsDiscarded ; unsigned long long bytesReceived ; unsigned long nackCount ; unsigned long firCount ; unsigned long pliCount ; double totalProcessingDelay ; DOMHighResTimeStamp estimatedPlayoutTimestamp ; double jitterBufferDelay ; double jitterBufferTargetDelay ; unsigned long long jitterBufferEmittedCount ; double jitterBufferMinimumDelay ; unsigned long long totalSamplesReceived ; unsigned long long concealedSamples ; unsigned long long silentConcealedSamples ; unsigned long long concealmentEvents ; unsigned long long insertedSamplesForDeceleration ; unsigned long long removedSamplesForAcceleration ; double audioLevel ; double totalAudioEnergy ; double totalSamplesDuration ; unsigned long framesReceived ; DOMString decoderImplementation ; DOMString playoutId ; boolean powerEfficientDecoder ; unsigned long framesAssembledFromMultiplePackets ; double totalAssemblyTime ; unsigned long long retransmittedPacketsReceived ; unsigned long long retransmittedBytesReceived ; unsigned long rtxSsrc ; unsigned long fecSsrc ; double totalCorruptionProbability ; double totalSquaredCorruptionProbability ; unsigned long long corruptionMeasurements ; }; Dictionary RTCInboundRtpStreamStats Members trackIdentifier of type DOMString The value of the MediaStreamTrack 's id attribute. mid of type DOMString If the RTCRtpTransceiver owning this stream has a mid value that is not null , this is that value, otherwise this member MUST NOT be present . remoteId of type DOMString The remoteId is used for looking up the remote RTCRemoteOutboundRtpStreamStats object for the same SSRC . framesDecoded MUST NOT exist for audio. It represents the total number of frames correctly decoded for this RTP stream , i.e., frames that would be displayed if no frames are dropped. keyFramesDecoded of type unsigned long MUST NOT exist for audio. It represents the total number of key frames, such as key frames in VP8 [ RFC6386 ] or IDR-frames in H.264 [ RFC6184 ], successfully decoded for this RTP media stream. This is a subset of framesDecoded . framesDecoded - keyFramesDecoded gives you the number of delta frames decoded. framesRendered MUST NOT exist for audio. It represents the total number of frames that have been rendered. It is incremented just after a frame has been rendered. framesDropped of type unsigned long MUST NOT exist for audio. The total number of frames dropped prior to decode or dropped because the frame missed its display deadline for this receiver's track. The measurement begins when the receiver is created and is a cumulative metric as defined in Appendix A (g) of [ RFC7004 ]. frameWidth of type unsigned long MUST NOT exist for audio. Represents the width of the last decoded frame. Before the first frame is decoded this member MUST NOT exist . frameHeight of type unsigned long MUST NOT exist for audio. Represents the height of the last decoded frame. Before the first frame is decoded this member MUST NOT exist . framesPerSecond of type double MUST NOT exist for audio. The number of decoded frames in the last second. qpSum of type unsigned long long MUST NOT exist for audio. The sum of the QP values of frames decoded by this receiver. The count of frames is in framesDecoded . The definition of QP value depends on the codec; for VP8, the QP value is the value carried in the frame header as the syntax element y_ac_qi , and defined in [ RFC6386 ] section 19.2. Its range is 0..127. Note that the QP value is only an indication of quantizer values used; many formats have ways to vary the quantizer value within the frame. totalDecodeTime of type double MUST NOT exist for audio. Total number of seconds that have been spent decoding the framesDecoded frames of this stream. The average decode time can be calculated by dividing this value with framesDecoded . The time it takes to decode one frame is the time passed between feeding the decoder a frame and the decoder returning decoded data for that frame. totalInterFrameDelay of type double MUST NOT exist for audio. Sum of the interframe delays in seconds between consecutively rendered frames, recorded just after a frame has been rendered. The interframe delay variance be calculated from totalInterFrameDelay , totalSquaredInterFrameDelay , and framesRendered according to the formula: ( totalSquaredInterFrameDelay - totalInterFrameDelay ^2/ framesRendered )/ framesRendered . totalSquaredInterFrameDelay of type double MUST NOT exist for audio. Sum of the squared interframe delays in seconds between consecutively rendered frames, recorded just after a frame has been rendered. See totalInterFrameDelay for details on how to calculate the interframe delay variance. pauseCount of type unsigned long MUST NOT exist for audio. Count the total number of video pauses experienced by this receiver. Video is considered to be paused if time passed since last rendered frame exceeds 5 seconds. pauseCount is incremented when a frame is rendered after such a pause. totalPausesDuration of type double MUST NOT exist for audio. Total duration of pauses (for definition of pause see pauseCount ), in seconds. This value is updated when a frame is rendered. freezeCount of type unsigned long MUST NOT exist for audio. Count the total number of video freezes experienced by this receiver. It is a freeze if frame duration, which is time interval between two consecutively rendered frames, is equal or exceeds Max(3 * avg_frame_duration_ms, avg_frame_duration_ms + 150), where avg_frame_duration_ms is linear average of durations of last 30 rendered frames. totalFreezesDuration of type double MUST NOT exist for audio. Total duration of rendered frames which are considered as frozen (for definition of freeze see freezeCount ), in seconds. This value is updated when a frame is rendered. lastPacketReceivedTimestamp of type DOMHighResTimeStamp Represents the timestamp at which the last packet was received for this SSRC . This differs from timestamp , which represents the time at which the statistics were generated by the local endpoint. headerBytesReceived of type unsigned long long Total number of RTP header and padding bytes received for this SSRC . This includes retransmissions. This does not include the size of transport layer headers such as IP or UDP. headerBytesReceived + bytesReceived equals the number of bytes received as payload over the transport. packetsDiscarded of type unsigned long long The cumulative number of RTP packets discarded by the jitter buffer due to late or early-arrival, i.e., these packets are not played out. RTP packets discarded due to packet duplication are not reported in this metric [ XRBLOCK-STATS ]. Calculated as defined in [ RFC7002 ] section 3.2 and Appendix A.a. fecBytesReceived of type unsigned long long Total number of RTP FEC bytes received for this SSRC , only including payload bytes. This is a subset of bytesReceived . If a FEC mechanism that uses a different ssrc was negotiated, FEC packets are sent over a separate SSRC but is still accounted for here. fecPacketsReceived of type unsigned long long Total number of RTP FEC packets received for this SSRC . If a FEC mechanism that uses a different ssrc was negotiated, FEC packets are sent over a separate SSRC but is still accounted for here. This counter can also be incremented when receiving FEC packets in-band with media packets (e.g., with Opus). fecPacketsDiscarded of type unsigned long long Total number of RTP FEC packets received for this SSRC where the error correction payload was discarded by the application. This may happen 1. if all the source packets protected by the FEC packet were received or already recovered by a separate FEC packet, or 2. if the FEC packet arrived late, i.e., outside the recovery window, and the lost RTP packets have already been skipped during playout. This is a subset of fecPacketsReceived . bytesReceived of type unsigned long long Total number of bytes received for this SSRC . This includes retransmissions. Calculated as defined in [ RFC3550 ] section 6.4.1. firCount of type unsigned long MUST NOT exist for audio. Count the total number of Full Intra Request (FIR) packets, as defined in [ RFC5104 ] section 4.3.1, sent by this receiver. Does not count the RTCP FIR indicated in [ RFC2032 ] which was deprecated by [ RFC4587 ]. pliCount of type unsigned long MUST NOT exist for audio. Count the total number of Picture Loss Indication (PLI) packets, as defined in [ RFC4585 ] section 6.3.1, sent by this receiver. totalProcessingDelay of type double It is the sum of the time, in seconds, each audio sample or video frame takes from the time the first RTP packet is received (reception timestamp) and to the time the corresponding sample or frame is decoded (decoded timestamp). At this point the audio sample or video frame is ready for playout by the MediaStreamTrack. Typically ready for playout here means after the audio sample or video frame is fully decoded by the decoder. Given the complexities involved, the time of arrival or the reception timestamp is measured as close to the network layer as possible and the decoded timestamp is measured as soon as the complete sample or frame is decoded. In the case of audio, several samples are received in the same RTP packet, all samples will share the same reception timestamp and different decoded timestamps. In the case of video, the frame is received over several RTP packets, in this case the earliest timestamp containing the frame is counted as the reception timestamp, and the decoded timestamp corresponds to when the complete frame is decoded. This metric is not incremented for frames that are not decoded, i.e. framesDropped . The average processing delay can be calculated by dividing the totalProcessingDelay with the framesDecoded for video (or provisional stats spec totalSamplesDecoded for audio). nackCount of type unsigned long Count the total number of Negative ACKnowledgement (NACK) packets, as defined in [ RFC4585 ] section 6.2.1, sent by this receiver. estimatedPlayoutTimestamp of type DOMHighResTimeStamp This is the estimated playout time of this receiver's track. The playout time is the NTP timestamp of the last playable audio sample or video frame that has a known timestamp (from an RTCP SR packet mapping RTP timestamps to NTP timestamps), extrapolated with the time elapsed since it was ready to be played out. This is the "current time" of the track in NTP clock time of the sender and can be present even if there is no audio currently playing. This can be useful for estimating how much audio and video is out of sync for two tracks from the same source, audioInboundRtpStats . estimatedPlayoutTimestamp - videoInboundRtpStats . estimatedPlayoutTimestamp . jitterBufferDelay of type double The purpose of the jitter buffer is to recombine RTP packets into frames (in the case of video) and have smooth playout. The model described here assumes that the samples or frames are still compressed and have not yet been decoded. It is the sum of the time, in seconds, each audio sample or a video frame takes from the time the first packet is received by the jitter buffer (ingest timestamp) to the time it exits the jitter buffer (emit timestamp). In the case of audio, several samples belong to the same RTP packet, hence they will have the same ingest timestamp but different jitter buffer emit timestamps. In the case of video, the frame maybe is received over several RTP packets, hence the ingest timestamp is the earliest packet of the frame that entered the jitter buffer and the emit timestamp is when the whole frame exits the jitter buffer. This metric increases upon samples or frames exiting, having completed their time in the buffer (and incrementing jitterBufferEmittedCount ). The average jitter buffer delay can be calculated by dividing the jitterBufferDelay with the jitterBufferEmittedCount . jitterBufferTargetDelay of type double This value is increased by the target jitter buffer delay every time a sample is emitted by the jitter buffer. The added target is the target delay, in seconds, at the time that the sample was emitted from the jitter buffer. To get the average target delay, divide by jitterBufferEmittedCount . jitterBufferEmittedCount of type unsigned long long The total number of audio sample s or video frames that have come out of the jitter buffer (increasing jitterBufferDelay ). jitterBufferMinimumDelay of type double There are various reasons why the jitter buffer delay might be increased to a higher value, such as to achieve AV synchronization or because a jitterBufferTarget was set on a RTCRtpReceiver. When using one of these mechanisms, it can be useful to keep track of the minimal jitter buffer delay that could have been achieved, so WebRTC clients can track the amount of additional delay that is being added. This metric works the same way as jitterBufferTargetDelay , except that it is not affected by external mechanisms that increase the jitter buffer target delay, such as jitterBufferTarget (see link above), AV sync, or any other mechanisms. This metric is purely based on the network characteristics such as jitter and packet loss, and can be seen as the minimum obtainable jitter buffer delay if no external factors would affect it. The metric is updated every time jitterBufferEmittedCount is updated. totalSamplesReceived of type unsigned long long MUST NOT exist for video. The total number of samples that have been received on this RTP stream. This includes concealedSamples . concealedSamples of type unsigned long long MUST NOT exist for video. The total number of samples that are concealed samples. A concealed sample is a sample that was replaced with synthesized samples generated locally before being played out. Examples of samples that have to be concealed are samples from lost packets (reported in packetsLost ) or samples from packets that arrive too late to be played out (reported in packetsDiscarded ). silentConcealedSamples of type unsigned long long MUST NOT exist for video. The total number of concealed samples inserted that are "silent". Playing out silent samples results in silence or comfort noise. This is a subset of concealedSamples . concealmentEvents of type unsigned long long MUST NOT exist for video. The number of concealment events. This counter increases every time a concealed sample is synthesized after a non-concealed sample. That is, multiple consecutive concealed samples will increase the concealedSamples count multiple times but is a single concealment event. insertedSamplesForDeceleration of type unsigned long long MUST NOT exist for video. When playout is slowed down, this counter is increased by the difference between the number of samples received and the number of samples played out. If playout is slowed down by inserting samples, this will be the number of inserted samples. removedSamplesForAcceleration of type unsigned long long MUST NOT exist for video. When playout is sped up, this counter is increased by the difference between the number of samples received and the number of samples played out. If speedup is achieved by removing samples, this will be the count of samples removed. audioLevel of type double MUST NOT exist for video. Represents the audio level of the receiving track. For audio levels of tracks attached locally, see RTCAudioSourceStats instead. The value is between 0..1 (linear), where 1.0 represents 0 dBov, 0 represents silence, and 0.5 represents approximately 6 dBSPL change in the sound pressure level from 0 dBov. The audioLevel is averaged over some small interval, using the algorithm described under totalAudioEnergy . The interval used is implementation-defined . totalAudioEnergy of type double MUST NOT exist for video. Represents the audio energy of the receiving track. For audio energy of tracks attached locally, see RTCAudioSourceStats instead. This value MUST be computed as follows: for each audio sample that is received (and thus counted by totalSamplesReceived ), add the sample's value divided by the highest-intensity encodable value, squared and then multiplied by the duration of the sample in seconds. In other words, duration * Math.pow(energy/maxEnergy, 2) . This can be used to obtain a root mean square (RMS) value that uses the same units as audioLevel , as defined in [ RFC6464 ]. It can be converted to these units using the formula Math.sqrt(totalAudioEnergy/totalSamplesDuration) . This calculation can also be performed using the differences between the values of two different getStats () calls, in order to compute the average audio level over any desired time interval. In other words, do Math.sqrt((energy2 - energy1)/(duration2 - duration1)) . For example, if a 10ms packet of audio is produced with an RMS of 0.5 (out of 1.0), this should add 0.5 * 0.5 * 0.01 = 0.0025 to totalAudioEnergy . If another 10ms packet with an RMS of 0.1 is received, this should similarly add 0.0001 to totalAudioEnergy . Then, Math.sqrt(totalAudioEnergy/totalSamplesDuration) becomes Math.sqrt(0.0026/0.02) = 0.36 , which is the same value that would be obtained by doing an RMS calculation over the contiguous 20ms segment of audio. If multiple audio channels are used, the audio energy of a sample refers to the highest energy of any channel. totalSamplesDuration of type double MUST NOT exist for video. Represents the audio duration of the receiving track. For audio durations of tracks attached locally, see RTCAudioSourceStats instead. Represents the total duration in seconds of all samples that have been received (and thus counted by totalSamplesReceived ). Can be used with totalAudioEnergy to compute an average audio level over different intervals. framesReceived of type unsigned long MUST NOT exist for audio. Represents the total number of complete frames received on this RTP stream . This metric is incremented when the complete frame is received. decoderImplementation of type DOMString MUST NOT exist unless exposing hardware is allowed . MUST NOT exist for audio. Identifies the decoder implementation used. This is useful for diagnosing interoperability issues. playoutId of type DOMString MUST NOT exist for video. If audio playout is happening, this is used to look up the corresponding RTCAudioPlayoutStats . powerEfficientDecoder of type boolean MUST NOT exist unless exposing hardware is allowed . MUST NOT exist for audio. Whether the decoder currently used is considered power efficient by the user agent. This SHOULD reflect if the configuration results in hardware acceleration, but the user agent MAY take other information into account when deciding if the configuration is considered power efficient. framesAssembledFromMultiplePackets of type unsigned long MUST NOT exist for audio. It represents the total number of frames correctly decoded for this RTP stream that consist of more than one RTP packet. For such frames the totalAssemblyTime is incremented. The average frame assembly time can be calculated by dividing the totalAssemblyTime with framesAssembledFromMultiplePackets . totalAssemblyTime of type double MUST NOT exist for audio. The sum of the time, in seconds, each video frame takes from the time the first RTP packet is received (reception timestamp) and to the time the last RTP packet of a frame is received. Only incremented for frames consisting of more than one RTP packet. Given the complexities involved, the time of arrival or the reception timestamp is measured as close to the network layer as possible. This metric is not incremented for frames that are not decoded, i.e., framesDropped or frames that fail decoding for other reasons (if any). Only incremented for frames consisting of more than one RTP packet. retransmittedPacketsReceived of type unsigned long long The total number of retransmitted packets that were received for this SSRC . This is a subset of packetsReceived . If RTX is not negotiated, retransmitted packets can not be identified and this member MUST NOT exist . retransmittedBytesReceived of type unsigned long long The total number of retransmitted bytes that were received for this SSRC , only including payload bytes. This is a subset of bytesReceived . If RTX is not negotiated, retransmitted packets can not be identified and this member MUST NOT exist . rtxSsrc of type unsigned long If RTX is negotiated for retransmissions on a separate RTP stream , this is the SSRC of the RTX stream that is associated with this stream's ssrc . If RTX is not negotiated, this value MUST NOT be present . fecSsrc of type unsigned long If a FEC mechanism that uses a separate RTP stream is negotiated, this is the SSRC of the FEC stream that is associated with this stream's ssrc . If FEC is not negotiated or uses the same RTP stream , this value MUST NOT be present . totalCorruptionProbability of type double MUST NOT exist for audio. Represents the cumulative sum of all corruption probability measurements that have been made for this SSRC, see corruptionMeasurements regarding when this attribute SHOULD be present . Each measurement added to totalCorruptionProbability MUST be in the range [0.0, 1.0], where a value of 0.0 indicates the system has estimated there is no or negligible corruption present in the processed frame. Similarly a value of 1.0 indicates there is almost certainly a corruption visible in the processed frame. A value in between those two indicates there is likely some corruption visible, but it could for instance have a low magnitude or be present only in a small portion of the frame. Note The corruption likelihood values are estimates - not guarantees. Even if the estimate is 0.0, there could be corruptions present (i.e. it's a false negative) for instance if only a very small area of the frame is affected. Similarly, even if the estimate is 1.0 there might not be a corruption present (i.e. it's a false positive) for instance if there are macroblocks with a QP far higher than the frame average. Just like there are edge cases for e.g. PSNR measurements, these metrics should primarily be used as a basis for statistical analysis rather than be used as an absolute truth on a per-frame basis. totalSquaredCorruptionProbability of type double MUST NOT exist for audio. Represents the cumulative sum of all corruption probability measurements squared that have been made for this SSRC, see corruptionMeasurements regarding when this attribute SHOULD be present . corruptionMeasurements of type unsigned long long MUST NOT exist for audio. When the user agent is able to make a corruption probability measurement, this counter is incremented for each such measurement and totalCorruptionProbability and totalSquaredCorruptionProbability are aggregated with this measurement and measurement squared respectively. If the corruption-detection header extension is present in the RTP packets, corruption probability measurements MUST be present . Note The corruption-detection header extension documented at http://www.webrtc.org/experiments/rtp-hdrext/corruption-detection is experimental. The identifier and format may change once an IETF standard has been established. 8.6 RTCRemoteInboundRtpStreamStats dictionary The RTCRemoteInboundRtpStreamStats dictionary represents the remote endpoint's measurement metrics for a particular incoming RTP stream (corresponding to an outgoing RTP stream at the sending endpoint). The timestamp reported in the statistics object is the time at which the corresponding RTCP RR was received. WebIDL dictionary RTCRemoteInboundRtpStreamStats : RTCReceivedRtpStreamStats { DOMString localId ; double roundTripTime ; double totalRoundTripTime ; double fractionLost ; unsigned long long roundTripTimeMeasurements ; unsigned long long packetsWithBleachedEct1Marking ; }; Dictionary RTCRemoteInboundRtpStreamStats Members localId of type DOMString The localId is used for looking up the local RTCOutboundRtpStreamStats object for the same SSRC . roundTripTime of type double Estimated round trip time for this SSRC based on the RTCP timestamps in the RTCP Receiver Report (RR) and measured in seconds. Calculated as defined in section 6.4.1. of [ RFC3550 ]. MUST NOT exist until a RTCP Receiver Report is received with a DLSR value other than 0 has been received. totalRoundTripTime of type double Represents the cumulative sum of all round trip time measurements in seconds since the beginning of the session. The individual round trip time is calculated based on the RTCP timestamps in the RTCP Receiver Report (RR) [ RFC3550 ], hence requires a DLSR value other than 0. The average round trip time can be computed from totalRoundTripTime by dividing it by roundTripTimeMeasurements . fractionLost of type double The fraction packet loss reported for this SSRC . Calculated as defined in [ RFC3550 ] section 6.4.1 and Appendix A.3. roundTripTimeMeasurements of type unsigned long long Represents the total number of RTCP RR blocks received for this SSRC that contain a valid round trip time. This counter will not increment if the roundTripTime can not be calculated because no RTCP Receiver Report with a DLSR value other than 0 has been received. packetsWithBleachedEct1Marking of type unsigned long long Number of packets that were sent with ECT(1) markings per [ RFC3168 ] section 3, but where an [ RFC8888 ] report gave information that the packet was received with a marking of "not-ECT". 8.7 RTCSentRtpStreamStats dictionary WebIDL dictionary RTCSentRtpStreamStats : RTCRtpStreamStats { unsigned long long packetsSent ; unsigned long long bytesSent ; }; Dictionary RTCSentRtpStreamStats Members packetsSent of type unsigned long long Total number of RTP packets sent for this SSRC . This includes retransmissions. Calculated as defined in [ RFC3550 ] section 6.4.1. bytesSent of type unsigned long long Total number of bytes sent for this SSRC . This includes retransmissions. Calculated as defined in [ RFC3550 ] section 6.4.1. 8.8 RTCOutboundRtpStreamStats dictionary The RTCOutboundRtpStreamStats dictionary represents the measurement metrics for the outgoing RTP stream . The timestamp reported in the statistics object is the time at which the data was sampled. WebIDL dictionary RTCOutboundRtpStreamStats : RTCSentRtpStreamStats { DOMString mid ; DOMString mediaSourceId ; DOMString remoteId ; DOMString rid ; unsigned long encodingIndex ; unsigned long long headerBytesSent ; unsigned long long retransmittedPacketsSent ; unsigned long long retransmittedBytesSent ; unsigned long rtxSsrc ; double targetBitrate ; unsigned long long totalEncodedBytesTarget ; unsigned long frameWidth ; unsigned long frameHeight ; double framesPerSecond ; unsigned long framesSent ; unsigned long hugeFramesSent ; unsigned long framesEncoded ; unsigned long keyFramesEncoded ; unsigned long long qpSum ; record < DOMString , double > psnrSum ; unsigned long long psnrMeasurements ; double totalEncodeTime ; double totalPacketSendDelay ; RTCQualityLimitationReason qualityLimitationReason ; record < DOMString , double > qualityLimitationDurations ; unsigned long qualityLimitationResolutionChanges ; unsigned long nackCount ; unsigned long firCount ; unsigned long pliCount ; DOMString encoderImplementation ; boolean powerEfficientEncoder ; boolean active ; DOMString scalabilityMode ; unsigned long long packetsSentWithEct1 ; }; Dictionary RTCOutboundRtpStreamStats Members mid of type DOMString If the RTCRtpTransceiver owning this stream has a mid value that is not null , this is that value, otherwise this member MUST NOT be present . mediaSourceId of type DOMString The identifier of the stats object representing the track currently attached to the sender of this stream, an RTCMediaSourceStats . remoteId of type DOMString The remoteId is used for looking up the remote RTCRemoteInboundRtpStreamStats object for the same SSRC . rid of type DOMString MUST NOT exist for audio. Only exist s if a rid has been set for this RTP stream . If rid is set this value will be present regardless if the RID RTP header extension has been negotiated. encodingIndex of type unsigned long MUST NOT exist for audio. This is the index of the encoding that represents this RTP stream in the RTP sender's list of encodings . headerBytesSent of type unsigned long long Total number of RTP header and padding bytes sent for this SSRC . This does not include the size of transport layer headers such as IP or UDP. headerBytesSent + bytesSent equals the number of bytes sent as payload over the transport. retransmittedPacketsSent of type unsigned long long The total number of packets that were retransmitted for this SSRC . This is a subset of packetsSent . If RTX is not negotiated, retransmitted packets are sent over this ssrc . If RTX was negotiated, retransmitted packets are sent over a separate SSRC but is still accounted for here. retransmittedBytesSent of type unsigned long long The total number of bytes that were retransmitted for this SSRC , only including payload bytes. This is a subset of bytesSent . If RTX is not negotiated, retransmitted bytes are sent over this ssrc . If RTX was negotiated, retransmitted bytes are sent over a separate SSRC but is still accounted for here. rtxSsrc of type unsigned long If RTX is negotiated for retransmissions on a separate RTP stream , this is the SSRC of the RTX stream that is associated with this stream's ssrc . If RTX is not negotiated, this value MUST NOT be present . targetBitrate of type double Reflects the current encoder target in bits per second. The target is an instantaneous value reflecting the encoder's settings, but the resulting payload bytes sent per second, excluding retransmissions, SHOULD closely correlate to the target. See also bytesSent and retransmittedBytesSent . The targetBitrate is defined in the same way as the Transport Independent Application Specific (TIAS) bitrate [ RFC3890 ]. totalEncodedBytesTarget of type unsigned long long MUST NOT exist for audio. This value is increased by the target frame size in bytes every time a frame has been encoded. The actual frame size may be bigger or smaller than this number. This value goes up every time framesEncoded goes up. frameWidth of type unsigned long MUST NOT exist for audio. Represents the width of the last encoded frame. The resolution of the encoded frame may be lower than the media source (see RTCVideoSourceStats . width ). Before the first frame is encoded this member MUST NOT exist . frameHeight of type unsigned long MUST NOT exist for audio. Represents the height of the last encoded frame. The resolution of the encoded frame may be lower than the media source (see RTCVideoSourceStats . height ). Before the first frame is encoded this member MUST NOT exist . framesPerSecond of type double MUST NOT exist for audio. The number of encoded frames during the last second. This may be lower than the media source frame rate (see RTCVideoSourceStats . framesPerSecond ). framesSent of type unsigned long MUST NOT exist for audio. Represents the total number of frames sent on this RTP stream . hugeFramesSent of type unsigned long MUST NOT exist for audio. Represents the total number of huge frames sent by this RTP stream. Huge frames, by definition, are frames that have an encoded size at least 2.5 times the average size of the frames. The average size of the frames is defined as the target bitrate per second divided by the target FPS at the time the frame was encoded. These are usually complex to encode frames with a lot of changes in the picture. This can be used to estimate, e.g slide changes in the streamed presentation. The multiplier of 2.5 is choosen from analyzing encoded frame sizes for a sample presentation using WebRTC standalone implementation. 2.5 is a reasonably large multiplier which still caused all slide change events to be identified as a huge frames. It, however, produced 1.4% of false positive slide change detections which is deemed reasonable. framesEncoded of type unsigned long MUST NOT exist for audio. It represents the total number of frames successfully encoded for this RTP media stream. keyFramesEncoded of type unsigned long MUST NOT exist for audio. It represents the total number of key frames, such as key frames in VP8 [ RFC6386 ] or IDR-frames in H.264 [ RFC6184 ], successfully encoded for this RTP media stream. This is a subset of framesEncoded . framesEncoded - keyFramesEncoded gives you the number of delta frames encoded. qpSum of type unsigned long long MUST NOT exist for audio. The sum of the QP values of frames encoded by this sender. The count of frames is in framesEncoded . The definition of QP value depends on the codec; for VP8, the QP value is the value carried in the frame header as the syntax element y_ac_qi , and defined in [ RFC6386 ] section 19.2. Its range is 0..127. Note that the QP value is only an indication of quantizer values used; many formats have ways to vary the quantizer value within the frame. psnrSum of type record<DOMString, double> MUST NOT exist unless exposing hardware is allowed . MUST NOT exist for audio. The cumulative sum of the PSNR values of frames encoded by this sender. The record includes values for the "y", "u" and "v" components. The count of measurements is in psnrMeasurements . PSNR is defined in [ ISO-29170-1:2017 ]. Note PSNR metrics are intended for statistical analysis rather than representing absolute truth on a per-frame basis. psnrMeasurements of type unsigned long long MUST NOT exist unless exposing hardware is allowed . MUST NOT exist for audio. The number of times PSNR was measured. The components of psnrSum are aggregated with this measurement. The PSNR is defined in [ ISO-29170-1:2017 ]. The frequency of PSNR measurements is implementation-defined . Note User agents are encouraged to measure PSNR at a fixed frequency for each encoder implementation, and as frequently as possible as long as it does not introduce a noticeable performance penalty. totalEncodeTime of type double MUST NOT exist for audio. Total number of seconds that has been spent encoding the framesEncoded frames of this stream. The average encode time can be calculated by dividing this value with framesEncoded . The time it takes to encode one frame is the time passed between feeding the encoder a frame and the encoder returning encoded data for that frame. This does not include any additional time it may take to packetize the resulting data. totalPacketSendDelay of type double The total number of seconds that packets have spent buffered locally before being transmitted onto the network. The time is measured from when a packet is emitted from the RTP packetizer until it is handed over to the OS network socket. This measurement is added to totalPacketSendDelay when packetsSent is incremented. qualityLimitationReason of type RTCQualityLimitationReason MUST NOT exist for audio. The current reason for limiting the resolution and/or framerate, or " none " if not limited. The implementation reports the most limiting factor. If the implementation is not able to determine the most limiting factor because multiple may exist, the reasons MUST be reported in the following order of priority: "bandwidth", "cpu", "other". Note The consumption of CPU and bandwidth resources is interdependent and difficult to estimate, making it hard to determine what the "most limiting factor" is. The priority order promoted here is based on the heuristic that "bandwidth" is generally more varying and thus a more likely and more useful signal than "cpu". qualityLimitationDurations of type record<DOMString, double> MUST NOT exist for audio. A record of the total time, in seconds, that this stream has spent in each quality limitation state. The record includes a mapping for all RTCQualityLimitationReason types, including " none ". The sum of all entries minus qualityLimitationDurations [" none "] gives the total time that the stream has been limited. qualityLimitationResolutionChanges of type unsigned long MUST NOT exist for audio. The number of times that the resolution has changed because we are quality limited ( qualityLimitationReason has a value other than " none "). The counter is initially zero and increases when the resolution goes up or down. For example, if a 720p track is sent as 480p for some time and then recovers to 720p, qualityLimitationResolutionChanges will have the value 2. nackCount of type unsigned long Count the total number of Negative ACKnowledgement (NACK) packets, as defined in [ RFC4585 ] section 6.2.1, received by this sender. firCount of type unsigned long MUST NOT exist for audio. Count the total number of Full Intra Request (FIR) packets, as defined in [ RFC5104 ] section 4.3.1, received by this sender. Does not count the RTCP FIR indicated in [ RFC2032 ] which was deprecated by [ RFC4587 ]. pliCount of type unsigned long MUST NOT exist for audio. Count the total number of Picture Loss Indication (PLI) packets, as defined in [ RFC4585 ] section 6.3.1, received by this sender encoderImplementation of type DOMString MUST NOT exist unless exposing hardware is allowed . MUST NOT exist for audio. Identifies the encoder implementation used. This is useful for diagnosing interoperability issues. powerEfficientEncoder of type boolean MUST NOT exist unless exposing hardware is allowed . MUST NOT exist for audio. Whether the encoder currently used is considered power efficient by the user agent. This SHOULD reflect if the configuration results in hardware acceleration, but the user agent MAY take other information into account when deciding if the configuration is considered power efficient. active of type boolean Indicates whether this RTP stream is configured to be sent or disabled. Note that an active stream can still not be sending, e.g. when being limited by network conditions. scalabilityMode of type DOMString MUST NOT exist for audio. Only exist s when a scalability mode is currently configured for this RTP stream . packetsSentWithEct1 of type unsigned long long Total number of RTP packets sent for this SSRC with the ECT(1) marking defined in [ RFC3168 ] section 5 and used by the L4S protocol described in [ RFC9331 ]. 8.9 RTCQualityLimitationReason enum WebIDL enum RTCQualityLimitationReason { " none " , " cpu " , " bandwidth " , " other " , }; RTCQualityLimitationReason Enumeration description Enum value Description none The resolution and/or framerate is not limited. cpu The resolution and/or framerate is primarily limited due to CPU load. bandwidth The resolution and/or framerate is primarily limited due to congestion cues during bandwidth estimation. Typical, congestion control algorithms use inter-arrival time, round-trip time, packet or other congestion cues to perform bandwidth estimation. other The resolution and/or framerate is primarily limited for a reason other than the above. 8.10 RTCRemoteOutboundRtpStreamStats dictionary The RTCRemoteOutboundRtpStreamStats dictionary represents the remote endpoint's measurement metrics for its outgoing RTP stream (corresponding to an outgoing RTP stream at the sending endpoint). The timestamp reported in the statistics object is the time at which the corresponding RTCP SR was received. WebIDL dictionary RTCRemoteOutboundRtpStreamStats : RTCSentRtpStreamStats { DOMString localId ; DOMHighResTimeStamp remoteTimestamp ; unsigned long long reportsSent ; double roundTripTime ; double totalRoundTripTime ; unsigned long long roundTripTimeMeasurements ; }; Dictionary RTCRemoteOutboundRtpStreamStats Members localId of type DOMString The localId is used for looking up the local RTCInboundRtpStreamStats object for the same SSRC . remoteTimestamp of type DOMHighResTimeStamp remoteTimestamp , of type DOMHighResTimeStamp [ HIGHRES-TIME ], represents the remote timestamp at which these statistics were sent by the remote endpoint. This differs from timestamp , which represents the time at which the statistics were generated or received by the local endpoint. The remoteTimestamp , if present, is derived from the NTP timestamp in an RTCP Sender Report (SR) block, which reflects the remote endpoint's clock. That clock may not be synchronized with the local clock. reportsSent of type unsigned long long Represents the total number of RTCP Sender Report (SR) blocks sent for this SSRC . roundTripTime of type double Estimated round trip time for this SSRC based on the latest RTCP Sender Report (SR) that contains a DLRR report block as defined in [ RFC3611 ]. The Calculation of the round trip time is defined in section 4.5. of [ RFC3611 ]. MUST NOT exist if the latest SR does not contain the DLRR report block, or if the last RR timestamp in the DLRR report block is zero, or if the delay since last RR value in the DLRR report block is zero. totalRoundTripTime of type double Represents the cumulative sum of all round trip time measurements in seconds since the beginning of the session. The individual round trip time is calculated based on the DLRR report block in the RTCP Sender Report (SR) [ RFC3611 ]. This counter will not increment if the roundTripTime can not be calculated. The average round trip time can be computed from totalRoundTripTime by dividing it by roundTripTimeMeasurements . roundTripTimeMeasurements of type unsigned long long Represents the total number of RTCP Sender Report (SR) blocks received for this SSRC that contain a DLRR report block that can derive a valid round trip time according to [ RFC3611 ]. This counter will not increment if the roundTripTime can not be calculated. 8.11 RTCMediaSourceStats dictionary The RTCMediaSourceStats dictionary represents a track that is currently attached to one or more senders. It contains information about media sources such as frame rate and resolution prior to encoding. This is the media passed from the MediaStreamTrack to the RTCRtpSender s. This is in contrast to RTCOutboundRtpStreamStats whose members describe metrics as measured after the encoding step. For example, a track may be captured from a high-resolution camera, its frames downscaled due to track constraints and then further downscaled by the encoders due to CPU and network conditions. This dictionary reflects the video frames or audio sample s passed out from the track - after track constraints have been applied but before any encoding or further downsampling occurs. Media source objects are of either subdictionary RTCAudioSourceStats or RTCVideoSourceStats . The type is the same (" media-source ") but kind is different ( "audio" or "video" ) depending on the kind of track. The media source stats objects are created when a track is attached to any RTCRtpSender and may subsequently be attached to multiple senders during its life. The life of this object ends when the track is no longer attached to any sender of the same RTCPeerConnection . If a track whose media source object ended is attached again this results in a new media source stats object whose counters (such as number of frames) are reset. WebIDL dictionary RTCMediaSourceStats : RTCStats { required DOMString trackIdentifier ; required DOMString kind ; }; Dictionary RTCMediaSourceStats Members trackIdentifier of type DOMString The value of the MediaStreamTrack 's id attribute. kind of type DOMString The value of the MediaStreamTrack 's kind attribute. This is either "audio" or "video" . If it is "audio" then this stats object is of type RTCAudioSourceStats . If it is "video" then this stats object is of type RTCVideoSourceStats . 8.12 RTCAudioSourceStats dictionary The RTCAudioSourceStats dictionary represents an audio track that is attached to one or more senders. It is an RTCMediaSourceStats whose kind is "audio" . WebIDL dictionary RTCAudioSourceStats : RTCMediaSourceStats { double audioLevel ; double totalAudioEnergy ; double totalSamplesDuration ; double echoReturnLoss ; double echoReturnLossEnhancement ; }; Dictionary RTCAudioSourceStats Members audioLevel of type double Represents the audio level of the media source. For audio levels of remotely sourced tracks, see RTCInboundRtpStreamStats instead. The value is between 0..1 (linear), where 1.0 represents 0 dBov, 0 represents silence, and 0.5 represents approximately 6 dBSPL change in the sound pressure level from 0 dBov. The audioLevel is averaged over some small interval, using the algorithm described under totalAudioEnergy . The interval used is implementation-defined . totalAudioEnergy of type double Represents the audio energy of the media source. For audio energy of remotely sourced tracks, see RTCInboundRtpStreamStats instead. This value MUST be computed as follows: for each audio sample produced by the media source during the lifetime of this stats object, add the sample's value divided by the highest-intensity encodable value, squared and then multiplied by the duration of the sample in seconds. In other words, duration * Math.pow(energy/maxEnergy, 2) . This can be used to obtain a root mean square (RMS) value that uses the same units as audioLevel , as defined in [ RFC6464 ]. It can be converted to these units using the formula Math.sqrt(totalAudioEnergy/totalSamplesDuration) . This calculation can also be performed using the differences between the values of two different getStats () calls, in order to compute the average audio level over any desired time interval. In other words, do Math.sqrt((energy2 - energy1)/(duration2 - duration1)) . For example, if a 10ms packet of audio is produced with an RMS of 0.5 (out of 1.0), this should add 0.5 * 0.5 * 0.01 = 0.0025 to totalAudioEnergy . If another 10ms packet with an RMS of 0.1 is received, this should similarly add 0.0001 to totalAudioEnergy . Then, Math.sqrt(totalAudioEnergy/totalSamplesDuration) becomes Math.sqrt(0.0026/0.02) = 0.36 , which is the same value that would be obtained by doing an RMS calculation over the contiguous 20ms segment of audio. If multiple audio channels are used, the audio energy of a sample refers to the highest energy of any channel. totalSamplesDuration of type double Represents the audio duration of the media source. For audio durations of remotely sourced tracks, see RTCInboundRtpStreamStats instead. Represents the total duration in seconds of all samples that have been produced by this source for the lifetime of this stats object. Can be used with totalAudioEnergy to compute an average audio level over different intervals. echoReturnLoss of type double Only exist s when the MediaStreamTrack is sourced from a microphone where echo cancellation is applied. Calculated in decibels, as defined in [ ECHO ] (2012) section 3.14. If multiple audio channels are used, the channel of the least audio energy is considered for any sample. echoReturnLossEnhancement of type double Only exist s when the MediaStreamTrack is sourced from a microphone where echo cancellation is applied. Calculated in decibels, as defined in [ ECHO ] (2012) section 3.15. If multiple audio channels are used, the channel of the least audio energy is considered for any sample. 8.13 RTCVideoSourceStats dictionary The RTCVideoSourceStats dictionary represents a video track that is attached to one or more senders. It is an RTCMediaSourceStats whose kind is "video" . WebIDL dictionary RTCVideoSourceStats : RTCMediaSourceStats { unsigned long width ; unsigned long height ; unsigned long frames ; double framesPerSecond ; }; Dictionary RTCVideoSourceStats Members width of type unsigned long The width, in pixels, of the last frame originating from this source. Before a frame has been produced this member MUST NOT exist . height of type unsigned long The height, in pixels, of the last frame originating from this source. Before a frame has been produced this member MUST NOT exist . frames of type unsigned long The total number of frames originating from this source. framesPerSecond of type double The number of frames originating from this source, measured during the last second. For the first second of this object's lifetime this member MUST NOT exist . 8.14 RTCAudioPlayoutStats dictionary Only applicable if the playout path represents an audio device. Represents one playout path - if the same playout stats object is referenced by multiple RTCInboundRtpStreamStats this is an indication that audio mixing is happening in which case sample counters in this stats object refer to the samples after mixing. WebIDL dictionary RTCAudioPlayoutStats : RTCStats { required DOMString kind ; double synthesizedSamplesDuration ; unsigned long synthesizedSamplesEvents ; double totalSamplesDuration ; double totalPlayoutDelay ; unsigned long long totalSamplesCount ; }; Note The RTCAudioPlayoutStats dictionary and all of its metrics are features at risk due to lack of consensus. Dictionary RTCAudioPlayoutStats Members kind of type DOMString For audio playout, this has the value " audio ". This reflects the kind attribute MediaStreamTrack (s) being played out. synthesizedSamplesDuration of type double If the playout path is unable to produce audio samples on time for device playout, samples are synthesized to be playout out instead. synthesizedSamplesDuration is measured in seconds and is incremented each time an audio sample is synthesized by this playout path. This metric can be used together with totalSamplesDuration to calculate the percentage of played out media being synthesized. Synthesization typically only happens if the pipeline is underperforming. Samples synthesized by the RTCInboundRtpStreamStats are not counted for here, but in RTCInboundRtpStreamStats . concealedSamples . synthesizedSamplesEvents of type unsigned long The number of synthesized samples events. This counter increases every time a sample is synthesized after a non-synthesized sample. That is, multiple consecutive synthesized samples will increase synthesizedSamplesDuration multiple times but is a single synthesization samples event. totalSamplesDuration of type double The total duration, in seconds, of all audio samples that have been playout. Includes both synthesized and non-synthesized samples. totalPlayoutDelay of type double When audio samples are pulled by the playout device, this counter is incremented with the estimated delay of the playout path for that audio sample. The playout delay includes the delay from being emitted to the actual time of playout on the device. This metric can be used together with totalSamplesCount to calculate the average playout delay per sample. totalSamplesCount of type unsigned long long When audio samples are pulled by the playout device, this counter is incremented with the number of samples emitted for playout. 8.15 RTCPeerConnectionStats dictionary WebIDL dictionary RTCPeerConnectionStats : RTCStats { unsigned long dataChannelsOpened ; unsigned long dataChannelsClosed ; }; Dictionary RTCPeerConnectionStats Members dataChannelsOpened of type unsigned long Represents the number of unique RTCDataChannel s that have entered the " open " state during their lifetime. dataChannelsClosed of type unsigned long Represents the number of unique RTCDataChannel s that have left the " open " state during their lifetime (due to being closed by either end or the underlying transport being closed). RTCDataChannel s that transition from " connecting " to " closing " or " closed " without ever being " open " are not counted in this number. The total number of open data channels at any time can be calculated as dataChannelsOpened - dataChannelsClosed . This number is always positive. 8.16 RTCDataChannelStats dictionary WebIDL dictionary RTCDataChannelStats : RTCStats { DOMString label ; DOMString protocol ; unsigned short dataChannelIdentifier ; required RTCDataChannelState state ; unsigned long messagesSent ; unsigned long long bytesSent ; unsigned long messagesReceived ; unsigned long long bytesReceived ; }; Dictionary RTCDataChannelStats Members label of type DOMString The label value of the RTCDataChannel object. protocol of type DOMString The protocol value of the RTCDataChannel object. dataChannelIdentifier of type unsigned short The id attribute of the RTCDataChannel object. state of type RTCDataChannelState The readyState value of the RTCDataChannel object. messagesSent of type unsigned long Represents the total number of API "message" events sent. bytesSent of type unsigned long long Represents the total number of payload bytes sent on this RTCDataChannel . messagesReceived of type unsigned long Represents the total number of API "message" events received. bytesReceived of type unsigned long long Represents the total number of payload bytes received on this RTCDataChannel . 8.17 RTCTransportStats dictionary An RTCTransportStats object represents the stats corresponding to an RTCDtlsTransport and its underlying RTCIceTransport . When bundling is used, a single transport will be used for all MediaStreamTrack s in the bundle group. If bundling is not used, different MediaStreamTrack will use different transports. Bundling is described in [ WEBRTC ]. WebIDL dictionary RTCTransportStats : RTCStats { unsigned long long packetsSent ; unsigned long long packetsReceived ; unsigned long long bytesSent ; unsigned long long bytesReceived ; RTCIceRole iceRole ; DOMString iceLocalUsernameFragment ; required RTCDtlsTransportState dtlsState ; RTCIceTransportState iceState ; DOMString selectedCandidatePairId ; DOMString localCertificateId ; DOMString remoteCertificateId ; DOMString tlsVersion ; DOMString dtlsCipher ; RTCDtlsRole dtlsRole ; DOMString srtpCipher ; unsigned long selectedCandidatePairChanges ; unsigned long ccfbMessagesSent ; unsigned long ccfbMessagesReceived ; }; Dictionary RTCTransportStats Members packetsSent of type unsigned long long Represents the total number of packets sent over this transport. packetsReceived of type unsigned long long Represents the total number of packets received on this transport. bytesSent of type unsigned long long Represents the total number of payload bytes sent on this RTCIceTransport , i.e., not including headers, padding or ICE connectivity checks. bytesReceived of type unsigned long long Represents the total number of payload bytes received on this RTCIceTransport , i.e., not including headers, padding or ICE connectivity checks. iceRole of type RTCIceRole Set to the current value of the role attribute of the underlying RTCDtlsTransport . iceTransport . iceLocalUsernameFragment of type DOMString Set to the current value of the local username fragment used in message validation procedures [ RFC5245 ] for this RTCIceTransport . It may be updated on setLocalDescription() and on ICE restart. dtlsState of type RTCDtlsTransportState Set to the current value of the state attribute of the underlying RTCDtlsTransport . iceState of type RTCIceTransportState Set to the current value of the state attribute of the underlying RTCIceTransport . selectedCandidatePairId of type DOMString It is a unique identifier that is associated to the object that was inspected to produce the RTCIceCandidatePairStats associated with this transport. localCertificateId of type DOMString For components where DTLS is negotiated, give local certificate. remoteCertificateId of type DOMString For components where DTLS is negotiated, give remote certificate. tlsVersion of type DOMString For components where DTLS is negotiated, the TLS version agreed. Only exist s after DTLS negotiation is complete. The value comes from ServerHello.supported_versions if present, otherwise from ServerHello.version . It is represented as four upper case hexadecimal digits, representing the two bytes of the version. dtlsCipher of type DOMString Descriptive name of the cipher suite used for the DTLS transport, as defined in the "Description" column of the IANA cipher suite registry [ IANA-TLS-CIPHERS ]. dtlsRole of type RTCDtlsRole " client " or " server " depending on the DTLS role. " unknown " before the DTLS negotiation starts. srtpCipher of type DOMString Descriptive name of the protection profile used for the SRTP transport, as defined in the "Profile" column of the IANA DTLS-SRTP protection profile registry [ IANA-DTLS-SRTP ] and described further in [ RFC5764 ]. selectedCandidatePairChanges of type unsigned long The number of times that the selected candidate pair of this transport has changed. Going from not having a selected candidate pair to having a selected candidate pair, or the other way around, also increases this counter. It is initially zero and becomes one when an initial candidate pair is selected. ccfbMessagesSent of type unsigned long The number of Transport-Layer Feedback Messages of type CongestionControl Feedback Packet, as described in [ RFC8888 ] section 3.1, sent on this transport. ccfbMessagesReceived of type unsigned long The number of Transport-Layer Feedback Messages of type CongestionControl Feedback Packet, as described in [ RFC8888 ] section 3.1, received on this transport. RTCDtlsRole enum WebIDL enum RTCDtlsRole { " client " , " server " , " unknown " , }; RTCDtlsRole Enumeration description Enum value Description client The RTCPeerConnection is acting as a DTLS client as defined in [ RFC6347 ]. server The RTCPeerConnection is acting as a DTLS server as defined in [ RFC6347 ]. unknown The DTLS role of the RTCPeerConnection has not been determined yet. 8.18 RTCIceCandidateStats dictionary RTCIceCandidateStats reflects the properties of a candidate in Section 15.1 of [ RFC5245 ]. It corresponds to a RTCIceCandidate object. WebIDL dictionary RTCIceCandidateStats : RTCStats { required DOMString transportId ; DOMString ? address ; long port ; DOMString protocol ; required RTCIceCandidateType candidateType ; long priority ; DOMString url ; RTCIceServerTransportProtocol relayProtocol ; DOMString foundation ; DOMString relatedAddress ; long relatedPort ; DOMString usernameFragment ; RTCIceTcpCandidateType tcpType ; }; Dictionary RTCIceCandidateStats Members transportId of type DOMString It is a unique identifier that is associated to the object that was inspected to produce the RTCTransportStats associated with this candidate. address of type DOMString It is the address of the candidate, allowing for IPv4 addresses, IPv6 addresses, and fully qualified domain names (FQDNs). See [ RFC5245 ] section 15.1 for details. The user agent should make sure that only remote candidate addresses that the web application has configured on the corresponding RTCPeerConnection are exposed; This is especially important for peer reflexive remote candidates. By default, the user agent MUST leave the address member as null in the RTCIceCandidateStats dictionary of any remote candidate. Once a RTCPeerConnection instance learns on an address by the web application using addIceCandidate () , the user agent can expose the 'address' member value in any remote RTCIceCandidateStats dictionary of the corresponding RTCPeerConnection that matches the newly learnt address. port of type long It is the port number of the candidate. protocol of type DOMString Valid values for transport is one of "udp" and "tcp" . Based on the "transport" defined in [ RFC5245 ] section 15.1. candidateType of type RTCIceCandidateType This enumeration is defined in [ WEBRTC ]. priority of type long Calculated as defined in [ RFC5245 ] section 15.1. url of type DOMString For local candidates of type " srflx " or type " relay " this is the URL of the ICE server from which the candidate was obtained and defined in [ WEBRTC ]. For remote candidates, this property MUST NOT be present . relayProtocol of type RTCIceServerTransportProtocol It is the protocol used by the endpoint to communicate with the TURN server. This is only present for local relay candidates and defined in [ WEBRTC ]. For remote candidates, this property MUST NOT be present . foundation of type DOMString The ICE foundation as defined in [ RFC5245 ] section 15.1. relatedAddress of type DOMString The ICE rel-addr defined in [ RFC5245 ] section 15.1. Only set for serverreflexive, peerreflexive and relay candidates. relatedPort of type long The ICE rel-addr defined in [ RFC5245 ] section 15.1. Only set for serverreflexive, peerreflexive and relay candidates. usernameFragment of type DOMString The ICE username fragment as defined in [ RFC5245 ] section 7.1.2.3. For peerreflexive remote candidates this is not set unless the ICE username fragment has been previously signaled. tcpType of type RTCIceTcpCandidateType The ICE candidate TCP type, as defined іn RTCIceTcpCandidateType and used in RTCIceCandidate . 8.19 RTCIceCandidatePairStats dictionary WebIDL dictionary RTCIceCandidatePairStats : RTCStats { required DOMString transportId ; required DOMString localCandidateId ; required DOMString remoteCandidateId ; required RTCStatsIceCandidatePairState state ; boolean nominated ; unsigned long long packetsSent ; unsigned long long packetsReceived ; unsigned long long bytesSent ; unsigned long long bytesReceived ; DOMHighResTimeStamp lastPacketSentTimestamp ; DOMHighResTimeStamp lastPacketReceivedTimestamp ; double totalRoundTripTime ; double currentRoundTripTime ; double availableOutgoingBitrate ; double availableIncomingBitrate ; unsigned long long requestsReceived ; unsigned long long requestsSent ; unsigned long long responsesReceived ; unsigned long long responsesSent ; unsigned long long consentRequestsSent ; unsigned long packetsDiscardedOnSend ; unsigned long long bytesDiscardedOnSend ; }; Dictionary RTCIceCandidatePairStats Members transportId of type DOMString It is a unique identifier that is associated to the object that was inspected to produce the RTCTransportStats associated with this candidate pair. localCandidateId of type DOMString It is a unique identifier that is associated to the object that was inspected to produce the RTCIceCandidateStats for the local candidate associated with this candidate pair. remoteCandidateId of type DOMString It is a unique identifier that is associated to the object that was inspected to produce the RTCIceCandidateStats for the remote candidate associated with this candidate pair. state of type RTCStatsIceCandidatePairState Represents the state of the checklist for the local and remote candidates in a pair. nominated of type boolean Related to updating the nominated flag described in Section 7.1.3.2.4 of [ RFC5245 ]. packetsSent of type unsigned long long Represents the total number of packets sent on this candidate pair. packetsReceived of type unsigned long long Represents the total number of packets received on this candidate pair. bytesSent of type unsigned long long Represents the total number of payload bytes sent on this candidate pair, i.e., not including headers, padding or ICE connectivity checks. bytesReceived of type unsigned long long Represents the total number of payload bytes received on this candidate pair, i.e., not including headers, padding or ICE connectivity checks. lastPacketSentTimestamp of type DOMHighResTimeStamp Represents the timestamp at which the last packet was sent on this particular candidate pair, excluding STUN packets. lastPacketReceivedTimestamp of type DOMHighResTimeStamp Represents the timestamp at which the last packet was received on this particular candidate pair, excluding STUN packets. totalRoundTripTime of type double Represents the sum of all round trip time measurements in seconds since the beginning of the session, based on STUN connectivity check [ STUN-PATH-CHAR ] responses (responsesReceived), including those that reply to requests that are sent in order to verify consent [ RFC7675 ]. The average round trip time can be computed from totalRoundTripTime by dividing it by responsesReceived . currentRoundTripTime of type double Represents the latest round trip time measured in seconds, computed from both STUN connectivity checks [ STUN-PATH-CHAR ], including those that are sent for consent verification [ RFC7675 ]. availableOutgoingBitrate of type double It is calculated by the underlying congestion control by combining the available bitrate for all the outgoing RTP stream s using this candidate pair. The bitrate measurement does not count the size of the IP or other transport layers like TCP or UDP. It is similar to the TIAS defined in [ RFC3890 ], i.e., it is measured in bits per second and the bitrate is calculated over a 1 second window.

For candidate pairs in use, the estimate is normally no lower than the bitrate for the packets sent at lastPacketSentTimestamp , but might be higher. Only exist s when the underlying congestion control calculated either a send-side bandwidth estimation, for example using mechanisms such as TWCC , or received a receive-side estimation via RTCP, for example the one described in REMB . MUST NOT exist for candidate pairs that were never used for sending packets that were taken into account for bandwidth estimation or candidate pairs that have have been used previously but are not currently in use. availableIncomingBitrate of type double It is calculated by the underlying congestion control by combining the available bitrate for all the incoming RTP stream s using this candidate pair. The bitrate measurement does not count the size of the IP or other transport layers like TCP or UDP. It is similar to the TIAS defined in [ RFC3890 ], i.e., it is measured in bits per second and the bitrate is calculated over a 1 second window.

For pairs in use, the estimate is normally no lower than the bitrate for the packets received at lastPacketReceivedTimestamp , but might be higher. Only exist s when a receive-side bandwidth estimation, for example REMB was calculated. MUST NOT exist for candidate pairs that were never used for receiving packets that were taken into account for bandwidth estimation or candidate pairs that have have been used previously but are not currently in use. requestsReceived of type unsigned long long Represents the total number of connectivity check requests received (including retransmissions). It is impossible for the receiver to tell whether the request was sent in order to check connectivity or check consent, so all connectivity checks requests are counted here. requestsSent of type unsigned long long Represents the total number of connectivity check requests sent (not including retransmissions). responsesReceived of type unsigned long long Represents the total number of connectivity check responses received. responsesSent of type unsigned long long Represents the total number of connectivity check responses sent. Since we cannot distinguish connectivity check requests and consent requests, all responses are counted. consentRequestsSent of type unsigned long long Represents the total number of consent requests sent. packetsDiscardedOnSend of type unsigned long Total number of packets for this candidate pair that have been discarded due to socket errors, i.e. a socket error occurred when handing the packets to the socket. This might happen due to various reasons, including full buffer or no available memory. bytesDiscardedOnSend of type unsigned long long Total number of bytes for this candidate pair that have been discarded due to socket errors, i.e. a socket error occurred when handing the packets containing the bytes to the socket. This might happen due to various reasons, including full buffer or no available memory. Calculated as defined in [ RFC3550 ] section 6.4.1. 8.19.1 RTCStatsIceCandidatePairState enum WebIDL enum RTCStatsIceCandidatePairState { " frozen " , " waiting " , " in-progress " , " failed " , " succeeded " }; RTCStatsIceCandidatePairState Enumeration description Enum value Description frozen Defined in Section 5.7.4 of [ RFC5245 ]. waiting Defined in Section 5.7.4 of [ RFC5245 ]. in-progress Defined in Section 5.7.4 of [ RFC5245 ]. failed Defined in Section 5.7.4 of [ RFC5245 ]. succeeded Defined in Section 5.7.4 of [ RFC5245 ]. 8.20 RTCCertificateStats dictionary WebIDL dictionary RTCCertificateStats : RTCStats { required DOMString fingerprint ; required DOMString fingerprintAlgorithm ; required DOMString base64Certificate ; DOMString issuerCertificateId ; }; Dictionary RTCCertificateStats Members fingerprint of type DOMString The fingerprint of the certificate. Only use the fingerprint value as defined in Section 5 of [ RFC4572 ]. fingerprintAlgorithm of type DOMString The hash function used to compute the certificate fingerprint. For instance, "sha-256" . base64Certificate of type DOMString The DER-encoded base-64 representation of the certificate. issuerCertificateId of type DOMString The issuerCertificateId refers to the stats object that contains the next certificate in the certificate chain. If the current certificate is at the end of the chain (i.e. a self-signed certificate), this will not be set. 9. Examples 9.1 Example of a stats application Consider the case where the user is experiencing bad sound and the application wants to determine if the cause of it is packet loss. The following example code might be used: Example 2 var baselineReport, currentReport; var sender = pc. getSenders ()[ 0 ];

sender. getStats (). then ( function ( report ) { baselineReport = report; }) . then ( function ( ) { return new Promise ( function ( resolve ) { setTimeout (resolve, aBit); // ... wait a bit }); }) . then ( function ( ) { return sender. getStats (); }) . then ( function ( report ) { currentReport = report; processStats (); }) . catch ( function ( error ) { console . log (error. toString ()); }); function processStats ( ) { // compare the elements from the current report with the baseline for ( let now of currentReport. values ()) { if (now. type != "outbound-rtp" ) continue ; // get the corresponding stats from the baseline report let base = baselineReport. get (now. id ); if (base) { remoteNow = currentReport. get (now. remoteId ); remoteBase = baselineReport. get (base. remoteId ); var packetsSent = now. packetsSent - base. packetsSent ; var packetsReceived = remoteNow. packetsReceived - remoteBase. packetsReceived ; // if intervalFractionLoss is > 0.3, we've probably found the culprit var intervalFractionLoss = (packetsSent - packetsReceived) / packetsSent; } }); } 10. Security and Privacy Considerations The data exposed by WebRTC Statistics include most of the media and network data also exposed by [ GETUSERMEDIA ] and [ WEBRTC ] - as such, all the privacy and security considerations of these specifications related to data exposure apply as well to this specification. In addition, the properties exposed by RTCReceivedRtpStreamStats , RTCRemoteInboundRtpStreamStats , RTCSentRtpStreamStats , RTCOutboundRtpStreamStats , RTCRemoteOutboundRtpStreamStats , RTCIceCandidatePairStats , RTCTransportStats expose network-layer data not currently available to the JavaScript layer. Beyond the risks associated with revealing IP addresses as discussed in the WebRTC 1.0 specification , some combination of the network properties uniquely exposed by this specification can be correlated with location. For instance, the round-trip time exposed in RTCRemoteInboundRtpStreamStats can give some coarse indication on how far aparts the peers are located, and thus, if one of the peer's location is known, this may reveal information about the other peer. When applied to isolated streams, media metrics may allow an application to infer some characteristics of the isolated stream, such as if anyone is speaking (by watching the audioLevel statistic). The following stats are deemed to be sensitive, and MUST NOT be reported for an isolated media stream : RTCAudioSourceStats . audioLevel RTCAudioSourceStats . totalAudioEnergy RTCAudioSourceStats . audioLevel RTCInboundRtpStreamStats . audioLevel RTCInboundRtpStreamStats . totalAudioEnergy A. Summary of WebRTC stats fields per type RTCStatsType Dictionary Fields " codec " RTCStats timestamp type id RTCCodecStats payloadType transportId mimeType clockRate channels sdpFmtpLine " inbound-rtp " RTCStats timestamp type id RTCRtpStreamStats ssrc kind transportId codecId RTCReceivedRtpStreamStats packetsReceived packetsReceivedWithEct1 packetsReceivedWithCe packetsReportedAsLost packetsReportedAsLostButRecovered packetsLost jitter RTCInboundRtpStreamStats trackIdentifier mid remoteId framesDecoded keyFramesDecoded framesRendered framesDropped frameWidth frameHeight framesPerSecond qpSum totalDecodeTime totalInterFrameDelay totalSquaredInterFrameDelay pauseCount totalPausesDuration freezeCount totalFreezesDuration lastPacketReceivedTimestamp headerBytesReceived packetsDiscarded fecBytesReceived fecPacketsReceived fecPacketsDiscarded bytesReceived nackCount firCount pliCount totalProcessingDelay estimatedPlayoutTimestamp jitterBufferDelay jitterBufferTargetDelay jitterBufferEmittedCount jitterBufferMinimumDelay totalSamplesReceived concealedSamples silentConcealedSamples concealmentEvents insertedSamplesForDeceleration removedSamplesForAcceleration audioLevel totalAudioEnergy totalSamplesDuration framesReceived decoderImplementation playoutId powerEfficientDecoder framesAssembledFromMultiplePackets totalAssemblyTime retransmittedPacketsReceived retransmittedBytesReceived rtxSsrc fecSsrc totalCorruptionProbability totalSquaredCorruptionProbability corruptionMeasurements " outbound-rtp " RTCStats timestamp type id RTCRtpStreamStats ssrc kind transportId codecId RTCSentRtpStreamStats packetsSent bytesSent RTCOutboundRtpStreamStats mid mediaSourceId remoteId rid encodingIndex headerBytesSent retransmittedPacketsSent retransmittedBytesSent rtxSsrc targetBitrate totalEncodedBytesTarget frameWidth frameHeight framesPerSecond framesSent hugeFramesSent framesEncoded keyFramesEncoded qpSum psnrSum psnrMeasurements totalEncodeTime totalPacketSendDelay qualityLimitationReason qualityLimitationDurations qualityLimitationResolutionChanges nackCount firCount pliCount encoderImplementation powerEfficientEncoder active scalabilityMode packetsSentWithEct1 " remote-inbound-rtp " RTCStats timestamp type id RTCRtpStreamStats ssrc kind transportId codecId RTCReceivedRtpStreamStats packetsReceived packetsReceivedWithEct1 packetsReceivedWithCe packetsReportedAsLost packetsReportedAsLostButRecovered packetsLost jitter RTCRemoteInboundRtpStreamStats localId roundTripTime totalRoundTripTime fractionLost roundTripTimeMeasurements packetsWithBleachedEct1Marking " remote-outbound-rtp " RTCStats timestamp type id RTCRtpStreamStats ssrc kind transportId codecId RTCSentRtpStreamStats packetsSent bytesSent RTCRemoteOutboundRtpStreamStats localId remoteTimestamp reportsSent roundTripTime totalRoundTripTime roundTripTimeMeasurements " media-source " RTCStats timestamp type id RTCMediaSourceStats trackIdentifier kind RTCAudioSourceStats audioLevel totalAudioEnergy totalSamplesDuration echoReturnLoss echoReturnLossEnhancement RTCVideoSourceStats width height frames framesPerSecond " media-playout " RTCStats timestamp type id RTCAudioPlayoutStats kind synthesizedSamplesDuration synthesizedSamplesEvents totalSamplesDuration totalPlayoutDelay totalSamplesCount " peer-connection " RTCStats timestamp type id RTCPeerConnectionStats dataChannelsOpened dataChannelsClosed " data-channel " RTCStats timestamp type id RTCDataChannelStats label protocol dataChannelIdentifier state messagesSent bytesSent messagesReceived bytesReceived " transport " RTCStats timestamp type id RTCTransportStats packetsSent packetsReceived bytesSent bytesReceived iceRole iceLocalUsernameFragment dtlsState iceState selectedCandidatePairId localCertificateId remoteCertificateId tlsVersion dtlsCipher dtlsRole srtpCipher selectedCandidatePairChanges ccfbMessagesSent ccfbMessagesReceived " candidate-pair " RTCStats timestamp type id RTCIceCandidatePairStats transportId localCandidateId remoteCandidateId state nominated packetsSent packetsReceived bytesSent bytesReceived lastPacketSentTimestamp lastPacketReceivedTimestamp totalRoundTripTime currentRoundTripTime availableOutgoingBitrate availableIncomingBitrate requestsReceived requestsSent responsesReceived responsesSent consentRequestsSent packetsDiscardedOnSend bytesDiscardedOnSend " local-candidate " RTCStats timestamp type id RTCIceCandidateStats transportId address port protocol candidateType priority url relayProtocol foundation relatedAddress relatedPort usernameFragment tcpType " remote-candidate " RTCStats timestamp type id RTCIceCandidateStats transportId address port protocol candidateType priority url relayProtocol foundation relatedAddress relatedPort usernameFragment tcpType " certificate " RTCStats timestamp type id RTCCertificateStats fingerprint fingerprintAlgorithm base64Certificate issuerCertificateId B. Acknowledgements The editors wish to thank the Working Group chairs, Stefan Håkansson, and the Team Contact, Dominique Hazaël-Massieux, for their support. The editors would like to thank Bernard Aboba, Taylor Brandstetter, Henrik Boström, Jan-Ivar Bruaroey, Karthik Budigere, Cullen Jennings, and Lennart Schulte for their contributions to this specification. C. References C.1 Normative references [API-DESIGN-PRINCIPLES] Web Platform Design Principles . Martin Thomson; Jeffrey Yasskin. W3C. 18 September 2025. W3C Working Group Note. URL: https://www.w3.org/TR/design-principles/ [ECHO] Digital network echo cancellers . ITU-T G.168. ITU-T. Standard. URL: https://www.itu.int/rec/T-REC-G.168/en [GETUSERMEDIA] Media Capture and Streams . Cullen Jennings; Jan-Ivar Bruaroey; Henrik Boström; youenn fablet. W3C. 11 September 2025. CRD. URL: https://www.w3.org/TR/mediacapture-streams/ [HIGHRES-TIME] High Resolution Time . Yoav Weiss. W3C. 7 November 2024. W3C Working Draft. URL: https://www.w3.org/TR/hr-time-3/ [IANA-DTLS-SRTP] DTLS-SRTP Protection Profiles . IANA. URL: https://www.iana.org/assignments/srtp-protection/srtp-protection.xhtml [IANA-MEDIA-TYPES] Media Types . IANA. URL: https://www.iana.org/assignments/media-types/ [IANA-TLS-CIPHERS] TLS Cipher Suite Registry . IANA. URL: https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-parameters-4 [infra] Infra Standard . Anne van Kesteren; Domenic Denicola. WHATWG. Living Standard. URL: https://infra.spec.whatwg.org/ [ISO-29170-1:2017] Information technology — Advanced image coding and evaluation . ISO. URL: https://www.iso.org/standard/63637.html [RFC2119] Key words for use in RFCs to Indicate Requirement Levels . S. Bradner. IETF. March 1997. Best Current Practice. URL: https://www.rfc-editor.org/rfc/rfc2119 [RFC3168] The Addition of Explicit Congestion Notification (ECN) to IP . K. Ramakrishnan; S. Floyd; D. Black. IETF. September 2001. Proposed Standard. URL: https://www.rfc-editor.org/rfc/rfc3168 [RFC3550] RTP: A Transport Protocol for Real-Time Applications . H. Schulzrinne; S. Casner; R. Frederick; V. Jacobson. IETF. July 2003. Internet Standard. URL: https://www.rfc-editor.org/rfc/rfc3550 [RFC3611] RTP Control Protocol Extended Reports (RTCP XR) . T. Friedman, Ed.; R. Caceres, Ed.; A. Clark, Ed. IETF. November 2003. Proposed Standard. URL: https://www.rfc-editor.org/rfc/rfc3611 [RFC3890] A Transport Independent Bandwidth Modifier for the Session Description Protocol (SDP) . M. Westerlund. IETF. September 2004. Proposed Standard. URL: https://www.rfc-editor.org/rfc/rfc3890 [RFC4572] Connection-Oriented Media Transport over the Transport Layer Security (TLS) Protocol in the Session Description Protocol (SDP) . J. Lennox. IETF. July 2006. Proposed Standard. URL: https://www.rfc-editor.org/rfc/rfc4572 [RFC4585] Extended RTP Profile for Real-time Transport Control Protocol (RTCP)-Based Feedback (RTP/AVPF) . J. Ott; S. Wenger; N. Sato; C. Burmeister; J. Rey. IETF. July 2006. Proposed Standard. URL: https://www.rfc-editor.org/rfc/rfc4585 [RFC5104] Codec Control Messages in the RTP Audio-Visual Profile with Feedback (AVPF) . S. Wenger; U. Chandra; M. Westerlund; B. Burman. IETF. February 2008. Proposed Standard. URL: https://www.rfc-editor.org/rfc/rfc5104 [RFC5226] Guidelines for Writing an IANA Considerations Section in RFCs . T. Narten; H. Alvestrand. IETF. May 2008. Best Current Practice. URL: https://www.rfc-editor.org/rfc/rfc5226 [RFC5245] Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal for Offer/Answer Protocols . J. Rosenberg. IETF. April 2010. Proposed Standard. URL: https://www.rfc-editor.org/rfc/rfc5245 [RFC5764] Datagram Transport Layer Security (DTLS) Extension to Establish Keys for the Secure Real-time Transport Protocol (SRTP) . D. McGrew; E. Rescorla. IETF. May 2010. Proposed Standard. URL: https://www.rfc-editor.org/rfc/rfc5764 [RFC6184] RTP Payload Format for H.264 Video . Y.-K. Wang; R. Even; T. Kristensen; R. Jesup. IETF. May 2011. Proposed Standard. URL: https://www.rfc-editor.org/rfc/rfc6184 [RFC6347] Datagram Transport Layer Security Version 1.2 . E. Rescorla; N. Modadugu. IETF. January 2012. Proposed Standard. URL: https://www.rfc-editor.org/rfc/rfc6347 [RFC6386] VP8 Data Format and Decoding Guide . J. Bankoski; J. Koleszar; L. Quillio; J. Salonen; P. Wilkins; Y. Xu. IETF. November 2011. Informational. URL: https://www.rfc-editor.org/rfc/rfc6386 [RFC6464] A Real-time Transport Protocol (RTP) Header Extension for Client-to-Mixer Audio Level Indication . J. Lennox, Ed.; E. Ivov; E. Marocco. IETF. December 2011. Proposed Standard. URL: https://www.rfc-editor.org/rfc/rfc6464 [RFC7002] RTP Control Protocol (RTCP) Extended Report (XR) Block for Discard Count Metric Reporting . A. Clark; G. Zorn; Q. Wu. IETF. September 2013. Proposed Standard. URL: https://www.rfc-editor.org/rfc/rfc7002 [RFC7004] RTP Control Protocol (RTCP) Extended Report (XR) Blocks for Summary Statistics Metrics Reporting . G. Zorn; R. Schott; Q. Wu, Ed.; R. Huang. IETF. September 2013. Proposed Standard. URL: https://www.rfc-editor.org/rfc/rfc7004 [RFC7656] A Taxonomy of Semantics and Mechanisms for Real-Time Transport Protocol (RTP) Sources . J. Lennox; K. Gross; S. Nandakumar; G. Salgueiro; B. Burman, Ed. IETF. November 2015. Informational. URL: https://www.rfc-editor.org/rfc/rfc7656 [RFC7675] Session Traversal Utilities for NAT (STUN) Usage for Consent Freshness . M. Perumal; D. Wing; R. Ravindranath; T. Reddy; M. Thomson. IETF. October 2015. Proposed Standard. URL: https://www.rfc-editor.org/rfc/rfc7675 [RFC8174] Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words . B. Leiba. IETF. May 2017. Best Current Practice. URL: https://www.rfc-editor.org/rfc/rfc8174 [RFC8829] JavaScript Session Establishment Protocol (JSEP) . J. Uberti; C. Jennings; E. Rescorla, Ed. IETF. January 2021. Proposed Standard. URL: https://www.rfc-editor.org/rfc/rfc8829 [RFC8888] RTP Control Protocol (RTCP) Feedback for Congestion Control . Z. Sarker; C. Perkins; V. Singh; M. Ramalho. IETF. January 2021. Proposed Standard. URL: https://www.rfc-editor.org/rfc/rfc8888 [RFC9331] The Explicit Congestion Notification (ECN) Protocol for Low Latency, Low Loss, and Scalable Throughput (L4S) . K. De Schepper; B. Briscoe, Ed. IETF. January 2023. Experimental. URL: https://www.rfc-editor.org/rfc/rfc9331 [STUN-PATH-CHAR] Discovery of path characteristics using STUN . T. Reddy; D. Wing; P. Martinsen; V. Singh. IETF. Internet Draft. URL: https://datatracker.ietf.org/doc/html/draft-reddy-tram-stun-path-data [WEBIDL] Web IDL Standard . Edgar Chen; Timothy Gu. WHATWG. Living Standard. URL: https://webidl.spec.whatwg.org/ [WEBRTC] WebRTC: Real-Time Communication in Browsers . Cullen Jennings; Jan-Ivar Bruaroey; Henrik Boström; Florent Castelli. W3C. 13 March 2025. W3C Recommendation. URL: https://www.w3.org/TR/webrtc/ [WEBRTC-IDENTITY] Identity for WebRTC 1.0 . Cullen Jennings; Martin Thomson. W3C. 27 September 2018. W3C Candidate Recommendation. URL: https://www.w3.org/TR/webrtc-identity/ [WEBRTC-PRIORITY] WebRTC Priority Control API . Harald Alvestrand. W3C. 18 March 2021. W3C Candidate Recommendation. URL: https://www.w3.org/TR/webrtc-priority/ [XRBLOCK-STATS] RTCP XR Metrics for WebRTC . Varun Singh; Rachel Huang; Roni Even; Dan Romascanu; Lingli Deng. IETF. Internet Draft. URL: https://datatracker.ietf.org/doc/html/draft-ietf-xrblock-rtcweb-rtcp-xr-metrics C.2 Informative references [RFC2032] RTP Payload Format for H.261 Video Streams . T. Turletti; C. Huitema. IETF. October 1996. Proposed Standard. URL: https://www.rfc-editor.org/rfc/rfc2032 [RFC4587] RTP Payload Format for H.261 Video Streams . R. Even. IETF. August 2006. Proposed Standard. URL: https://www.rfc-editor.org/rfc/rfc4587 ↑ Permalink Referenced in: Not referenced in this document. Permalink Referenced in: § 7.1 RTCStatsType enum (2) (3) (4) (5) (6) (7) § 8.1 The RTP statistics hierarchy (2) (3) (4) (5) § Dictionary RTCRtpStreamStats Members (2) § Dictionary RTCInboundRtpStreamStats Members (2) (3) (4) (5) § 8.6 RTCRemoteInboundRtpStreamStats dictionary (2) § 8.8 RTCOutboundRtpStreamStats dictionary § Dictionary RTCOutboundRtpStreamStats Members (2) (3) (4) (5) (6) § 8.10 RTCRemoteOutboundRtpStreamStats dictionary (2) § Dictionary RTCIceCandidatePairStats Members (2) Permalink Referenced in: § 8.1 The RTP statistics hierarchy § Dictionary RTCReceivedRtpStreamStats Members (2) (3) (4) (5) § Dictionary RTCInboundRtpStreamStats Members (2) (3) (4) (5) (6) (7) (8) (9) § Dictionary RTCRemoteInboundRtpStreamStats Members (2) (3) (4) § Dictionary RTCSentRtpStreamStats Members (2) § Dictionary RTCOutboundRtpStreamStats Members (2) (3) (4) (5) § Dictionary RTCRemoteOutboundRtpStreamStats Members (2) (3) (4) Permalink Referenced in: § 7.1 RTCStatsType enum § 8.1 The RTP statistics hierarchy (2) (3) § Dictionary RTCReceivedRtpStreamStats Members § Dictionary RTCInboundRtpStreamStats Members § 8.10 RTCRemoteOutboundRtpStreamStats dictionary § Dictionary RTCRemoteOutboundRtpStreamStats Members (2) (3) (4) (5) Permalink Referenced in: § 7.1 RTCStatsType enum § 8.1 The RTP statistics hierarchy (2) (3) § Dictionary RTCReceivedRtpStreamStats Members (2) § 8.6 RTCRemoteInboundRtpStreamStats dictionary § Dictionary RTCRemoteInboundRtpStreamStats Members (2) (3) (4) Permalink Referenced in: § 7.1 RTCStatsType enum § 8.1 The RTP statistics hierarchy (2) Permalink Referenced in: § Dictionary RTCInboundRtpStreamStats Members (2) (3) (4) (5) § 8.11 RTCMediaSourceStats dictionary § Dictionary RTCAudioSourceStats Members Permalink exported Referenced in: § 4.3 Lifetime considerations for monitored objects (2) § 4.4 Guidelines for getStats() results caching/throttling § 8.1 The RTP statistics hierarchy Permalink exported Referenced in: § 4. Basic concepts (2) (3) § 4.1 Guidelines for design of stats objects § 4.3 Lifetime considerations for monitored objects Permalink exported Referenced in: § 4.1 Guidelines for design of stats objects (2) § 4.3 Lifetime considerations for monitored objects Permalink exported Referenced in: Not referenced in this document. Permalink IDL Referenced in: § 3. Terminology § 4. Basic concepts § 4.1 Guidelines for design of stats objects (2) (3) § 7. RTCStatsType § 8.2 RTCRtpStreamStats dictionary § 8.3 RTCCodecStats dictionary § 8.11 RTCMediaSourceStats dictionary § 8.14 RTCAudioPlayoutStats dictionary § 8.15 RTCPeerConnectionStats dictionary § 8.16 RTCDataChannelStats dictionary § 8.17 RTCTransportStats dictionary § 8.18 RTCIceCandidateStats dictionary § 8.19 RTCIceCandidatePairStats dictionary § 8.20 RTCCertificateStats dictionary Permalink exported Referenced in: § Dictionary RTCInboundRtpStreamStats Members § Dictionary RTCRemoteOutboundRtpStreamStats Members Permalink exported Referenced in: § 7. RTCStatsType (2) (3) § 8.11 RTCMediaSourceStats dictionary Permalink exported Referenced in: § 8.3 RTCCodecStats dictionary Permalink Referenced in: § 4.3 Lifetime considerations for monitored objects (2) § 4.4 Guidelines for getStats() results caching/throttling § 7.1 RTCStatsType enum (2) (3) (4) Permalink Referenced in: § Dictionary RTCInboundRtpStreamStats Members (2) § Dictionary RTCOutboundRtpStreamStats Members (2) (3) (4) Permalink exported IDL Referenced in: § 4. Basic concepts § 4.1 Guidelines for design of stats objects § 7. RTCStatsType (2) (3) § 7.1 RTCStatsType enum (2) § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 2. Conformance § 7.1 RTCStatsType enum § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 2. Conformance § 7.1 RTCStatsType enum § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 2. Conformance § 7.1 RTCStatsType enum § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 2. Conformance § 7.1 RTCStatsType enum § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § 8.11 RTCMediaSourceStats dictionary § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 7. RTCStatsType § 7.1 RTCStatsType enum § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 7. RTCStatsType § 7.1 RTCStatsType enum § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 2. Conformance § 8.1 The RTP statistics hierarchy § 8.2 RTCRtpStreamStats dictionary § Dictionary RTCRtpStreamStats Members § 8.4 RTCReceivedRtpStreamStats dictionary § 8.7 RTCSentRtpStreamStats dictionary Permalink exported IDL Referenced in: § 2. Conformance § 7.1 RTCStatsType enum § 8.1 The RTP statistics hierarchy § 8.2 RTCRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members (2) (3) (4) § Dictionary RTCOutboundRtpStreamStats Members (2) (3) Permalink exported IDL Referenced in: § 2. Conformance § 8.2 RTCRtpStreamStats dictionary Permalink exported IDL Referenced in: § 4.1 Guidelines for design of stats objects § 8.2 RTCRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.2 RTCRtpStreamStats dictionary § 8.3 RTCCodecStats dictionary Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § Dictionary RTCRtpStreamStats Members § 8.3 RTCCodecStats dictionary (2) (3) (4) (5) § Dictionary RTCCodecStats Members § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 8.3 RTCCodecStats dictionary Permalink exported IDL Referenced in: § 8.3 RTCCodecStats dictionary Permalink exported IDL Referenced in: § 8.3 RTCCodecStats dictionary Permalink exported IDL Referenced in: § 8.3 RTCCodecStats dictionary Permalink exported IDL Referenced in: § 8.3 RTCCodecStats dictionary Permalink exported IDL Referenced in: § 8.3 RTCCodecStats dictionary (2) Permalink exported IDL Referenced in: § 8.1 The RTP statistics hierarchy § 8.4 RTCReceivedRtpStreamStats dictionary § Dictionary RTCReceivedRtpStreamStats Members § 8.5 RTCInboundRtpStreamStats dictionary § 8.6 RTCRemoteInboundRtpStreamStats dictionary § 10. Security and Privacy Considerations Permalink exported IDL Referenced in: § 2. Conformance § 7.1 RTCStatsType enum (2) § 8.4 RTCReceivedRtpStreamStats dictionary § Dictionary RTCReceivedRtpStreamStats Members § Dictionary RTCInboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.4 RTCReceivedRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.4 RTCReceivedRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.4 RTCReceivedRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.4 RTCReceivedRtpStreamStats dictionary Permalink exported IDL Referenced in: § 2. Conformance § 8.4 RTCReceivedRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members Permalink exported IDL Referenced in: § 2. Conformance § 8.4 RTCReceivedRtpStreamStats dictionary Permalink exported IDL Referenced in: § 2. Conformance § 7.1 RTCStatsType enum (2) (3) (4) (5) § 8.1 The RTP statistics hierarchy (2) § 8.5 RTCInboundRtpStreamStats dictionary (2) § Dictionary RTCInboundRtpStreamStats Members § Dictionary RTCRemoteOutboundRtpStreamStats Members § Dictionary RTCAudioSourceStats Members (2) (3) § 8.14 RTCAudioPlayoutStats dictionary § Dictionary RTCAudioPlayoutStats Members (2) § 10. Security and Privacy Considerations (2) § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members (2) (3) (4) (5) Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members (2) (3) Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members (2) Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members (2) (3) Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members (2) Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members (2) Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 2. Conformance § 7.1 RTCStatsType enum (2) § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members (2) Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members (2) Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members (2) Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members (2) (3) (4) Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members (2) Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members (2) (3) § Dictionary RTCAudioPlayoutStats Members Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 4.2 Guidelines for implementing stats objects § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members (2) § 10. Security and Privacy Considerations Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members (2) (3) (4) § 10. Security and Privacy Considerations Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members (2) Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members (2) Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.5 RTCInboundRtpStreamStats dictionary § Dictionary RTCInboundRtpStreamStats Members (2) Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § 8.1 The RTP statistics hierarchy (2) § 8.6 RTCRemoteInboundRtpStreamStats dictionary (2) § Dictionary RTCRemoteInboundRtpStreamStats Members § Dictionary RTCOutboundRtpStreamStats Members § 10. Security and Privacy Considerations (2) § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 8.6 RTCRemoteInboundRtpStreamStats dictionary § Dictionary RTCRemoteInboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.6 RTCRemoteInboundRtpStreamStats dictionary § Dictionary RTCRemoteInboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.6 RTCRemoteInboundRtpStreamStats dictionary § Dictionary RTCRemoteInboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.6 RTCRemoteInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.6 RTCRemoteInboundRtpStreamStats dictionary § Dictionary RTCRemoteInboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.6 RTCRemoteInboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.1 The RTP statistics hierarchy § 8.7 RTCSentRtpStreamStats dictionary § Dictionary RTCSentRtpStreamStats Members § 8.8 RTCOutboundRtpStreamStats dictionary § 8.10 RTCRemoteOutboundRtpStreamStats dictionary § 10. Security and Privacy Considerations Permalink exported IDL Referenced in: § 2. Conformance § 7.1 RTCStatsType enum § 8.7 RTCSentRtpStreamStats dictionary § Dictionary RTCOutboundRtpStreamStats Members (2) Permalink exported IDL Referenced in: § 2. Conformance § 7.1 RTCStatsType enum § 8.7 RTCSentRtpStreamStats dictionary § Dictionary RTCOutboundRtpStreamStats Members (2) Permalink exported IDL Referenced in: § 2. Conformance § 7.1 RTCStatsType enum (2) (3) (4) § 8.1 The RTP statistics hierarchy (2) § Dictionary RTCRemoteInboundRtpStreamStats Members § 8.8 RTCOutboundRtpStreamStats dictionary (2) § Dictionary RTCOutboundRtpStreamStats Members § 8.11 RTCMediaSourceStats dictionary § 10. Security and Privacy Considerations § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 2. Conformance § 8.8 RTCOutboundRtpStreamStats dictionary § Dictionary RTCOutboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § 8.8 RTCOutboundRtpStreamStats dictionary § Dictionary RTCOutboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary § Dictionary RTCOutboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary § Dictionary RTCOutboundRtpStreamStats Members (2) (3) (4) (5) Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary § Dictionary RTCOutboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary § Dictionary RTCOutboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary § Dictionary RTCOutboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary § Dictionary RTCOutboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary § Dictionary RTCOutboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary § Dictionary RTCOutboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.8 RTCOutboundRtpStreamStats dictionary § Dictionary RTCOutboundRtpStreamStats Members (2) § 8.9 RTCQualityLimitationReason enum (2) Permalink exported IDL Referenced in: § Dictionary RTCOutboundRtpStreamStats Members (2) (3) (4) § 8.9 RTCQualityLimitationReason enum Permalink exported IDL Referenced in: § 8.9 RTCQualityLimitationReason enum Permalink exported IDL Referenced in: § 8.9 RTCQualityLimitationReason enum Permalink exported IDL Referenced in: § 8.9 RTCQualityLimitationReason enum Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § 8.1 The RTP statistics hierarchy (2) § Dictionary RTCInboundRtpStreamStats Members § 8.10 RTCRemoteOutboundRtpStreamStats dictionary (2) § Dictionary RTCRemoteOutboundRtpStreamStats Members § 10. Security and Privacy Considerations § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 2. Conformance § 8.10 RTCRemoteOutboundRtpStreamStats dictionary § Dictionary RTCRemoteOutboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.10 RTCRemoteOutboundRtpStreamStats dictionary § Dictionary RTCRemoteOutboundRtpStreamStats Members (2) Permalink exported IDL Referenced in: § 8.10 RTCRemoteOutboundRtpStreamStats dictionary Permalink exported IDL Referenced in: § 8.10 RTCRemoteOutboundRtpStreamStats dictionary § Dictionary RTCRemoteOutboundRtpStreamStats Members (2) Permalink exported IDL Referenced in: § 8.10 RTCRemoteOutboundRtpStreamStats dictionary § Dictionary RTCRemoteOutboundRtpStreamStats Members Permalink exported IDL Referenced in: § 8.10 RTCRemoteOutboundRtpStreamStats dictionary § Dictionary RTCRemoteOutboundRtpStreamStats Members Permalink exported IDL Referenced in: § Dictionary RTCOutboundRtpStreamStats Members § 8.11 RTCMediaSourceStats dictionary (2) § Dictionary RTCMediaSourceStats Members § 8.12 RTCAudioSourceStats dictionary (2) § 8.13 RTCVideoSourceStats dictionary (2) Permalink exported IDL Referenced in: § 8.11 RTCMediaSourceStats dictionary Permalink exported IDL Referenced in: § 8.11 RTCMediaSourceStats dictionary (2) § 8.12 RTCAudioSourceStats dictionary § 8.13 RTCVideoSourceStats dictionary Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § Dictionary RTCInboundRtpStreamStats Members (2) (3) § 8.11 RTCMediaSourceStats dictionary § Dictionary RTCMediaSourceStats Members § 8.12 RTCAudioSourceStats dictionary (2) § Dictionary RTCAudioSourceStats Members § 10. Security and Privacy Considerations (2) (3) § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 8.12 RTCAudioSourceStats dictionary § Dictionary RTCAudioSourceStats Members (2) § 10. Security and Privacy Considerations (2) (3) Permalink exported IDL Referenced in: § 8.12 RTCAudioSourceStats dictionary § Dictionary RTCAudioSourceStats Members (2) (3) (4) § 10. Security and Privacy Considerations Permalink exported IDL Referenced in: § 8.12 RTCAudioSourceStats dictionary Permalink exported IDL Referenced in: § 8.12 RTCAudioSourceStats dictionary Permalink exported IDL Referenced in: § 8.12 RTCAudioSourceStats dictionary Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § Dictionary RTCOutboundRtpStreamStats Members (2) (3) § 8.11 RTCMediaSourceStats dictionary § Dictionary RTCMediaSourceStats Members § 8.13 RTCVideoSourceStats dictionary (2) § Dictionary RTCVideoSourceStats Members § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § Dictionary RTCOutboundRtpStreamStats Members § 8.13 RTCVideoSourceStats dictionary Permalink exported IDL Referenced in: § Dictionary RTCOutboundRtpStreamStats Members § 8.13 RTCVideoSourceStats dictionary Permalink exported IDL Referenced in: § 8.13 RTCVideoSourceStats dictionary Permalink exported IDL Referenced in: § Dictionary RTCOutboundRtpStreamStats Members § 8.13 RTCVideoSourceStats dictionary Permalink exported Referenced in: § 7.1 RTCStatsType enum § Dictionary RTCInboundRtpStreamStats Members § 8.14 RTCAudioPlayoutStats dictionary (2) § Dictionary RTCAudioPlayoutStats Members § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 8.14 RTCAudioPlayoutStats dictionary Permalink exported IDL Referenced in: § 8.14 RTCAudioPlayoutStats dictionary § Dictionary RTCAudioPlayoutStats Members (2) Permalink exported IDL Referenced in: § 8.14 RTCAudioPlayoutStats dictionary Permalink exported IDL Referenced in: § 8.14 RTCAudioPlayoutStats dictionary § Dictionary RTCAudioPlayoutStats Members Permalink exported IDL Referenced in: § 8.14 RTCAudioPlayoutStats dictionary Permalink exported IDL Referenced in: § 8.14 RTCAudioPlayoutStats dictionary § Dictionary RTCAudioPlayoutStats Members Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § 8.15 RTCPeerConnectionStats dictionary § Dictionary RTCPeerConnectionStats Members § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 8.15 RTCPeerConnectionStats dictionary § Dictionary RTCPeerConnectionStats Members Permalink exported IDL Referenced in: § 8.15 RTCPeerConnectionStats dictionary § Dictionary RTCPeerConnectionStats Members Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § 8.16 RTCDataChannelStats dictionary § Dictionary RTCDataChannelStats Members § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 8.16 RTCDataChannelStats dictionary Permalink exported IDL Referenced in: § 8.16 RTCDataChannelStats dictionary Permalink exported IDL Referenced in: § 4.1 Guidelines for design of stats objects § 8.16 RTCDataChannelStats dictionary Permalink exported IDL Referenced in: § 8.16 RTCDataChannelStats dictionary Permalink exported IDL Referenced in: § 8.16 RTCDataChannelStats dictionary Permalink exported IDL Referenced in: § 8.16 RTCDataChannelStats dictionary Permalink exported IDL Referenced in: § 8.16 RTCDataChannelStats dictionary Permalink exported IDL Referenced in: § 8.16 RTCDataChannelStats dictionary Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § Dictionary RTCRtpStreamStats Members § Dictionary RTCCodecStats Members § 8.17 RTCTransportStats dictionary (2) § Dictionary RTCTransportStats Members § Dictionary RTCIceCandidateStats Members § Dictionary RTCIceCandidatePairStats Members § 10. Security and Privacy Considerations § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 8.17 RTCTransportStats dictionary Permalink exported IDL Referenced in: § 8.17 RTCTransportStats dictionary Permalink exported IDL Referenced in: § 8.17 RTCTransportStats dictionary Permalink exported IDL Referenced in: § 8.17 RTCTransportStats dictionary Permalink exported IDL Referenced in: § 8.17 RTCTransportStats dictionary Permalink exported IDL Referenced in: § 8.17 RTCTransportStats dictionary Permalink exported IDL Referenced in: § 8.17 RTCTransportStats dictionary Permalink exported IDL Referenced in: § 8.17 RTCTransportStats dictionary Permalink exported IDL Referenced in: § 8.17 RTCTransportStats dictionary Permalink exported IDL Referenced in: § 8.17 RTCTransportStats dictionary Permalink exported IDL Referenced in: § 8.17 RTCTransportStats dictionary Permalink exported IDL Referenced in: § 8.17 RTCTransportStats dictionary Permalink exported IDL Referenced in: § 8.17 RTCTransportStats dictionary Permalink exported IDL Referenced in: § 8.17 RTCTransportStats dictionary Permalink exported IDL Referenced in: § 8.17 RTCTransportStats dictionary Permalink exported IDL Referenced in: § 8.17 RTCTransportStats dictionary Permalink exported IDL Referenced in: § 8.17 RTCTransportStats dictionary Permalink exported IDL Referenced in: § 8.17 RTCTransportStats dictionary Permalink exported IDL Referenced in: § 8.17 RTCTransportStats dictionary § RTCDtlsRole enum (2) Permalink exported IDL Referenced in: § Dictionary RTCTransportStats Members § RTCDtlsRole enum Permalink exported IDL Referenced in: § Dictionary RTCTransportStats Members § RTCDtlsRole enum Permalink exported IDL Referenced in: § Dictionary RTCTransportStats Members § RTCDtlsRole enum Permalink exported IDL Referenced in: § 7. RTCStatsType § 7.1 RTCStatsType enum (2) § 8.18 RTCIceCandidateStats dictionary (2) § Dictionary RTCIceCandidateStats Members (2) (3) § Dictionary RTCIceCandidatePairStats Members (2) § A. Summary of WebRTC stats fields per type (2) Permalink exported IDL Referenced in: § 8.18 RTCIceCandidateStats dictionary Permalink exported IDL Referenced in: § 8.18 RTCIceCandidateStats dictionary § Dictionary RTCIceCandidateStats Members Permalink exported IDL Referenced in: § 8.18 RTCIceCandidateStats dictionary Permalink exported IDL Referenced in: § 8.18 RTCIceCandidateStats dictionary Permalink exported IDL Referenced in: § 8.18 RTCIceCandidateStats dictionary Permalink exported IDL Referenced in: § 8.18 RTCIceCandidateStats dictionary Permalink exported IDL Referenced in: § 8.18 RTCIceCandidateStats dictionary Permalink exported IDL Referenced in: § 8.18 RTCIceCandidateStats dictionary Permalink exported IDL Referenced in: § 8.18 RTCIceCandidateStats dictionary Permalink exported IDL Referenced in: § 8.18 RTCIceCandidateStats dictionary Permalink exported IDL Referenced in: § 8.18 RTCIceCandidateStats dictionary Permalink exported IDL Referenced in: § 8.18 RTCIceCandidateStats dictionary Permalink exported IDL Referenced in: § 8.18 RTCIceCandidateStats dictionary Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § Dictionary RTCTransportStats Members § 8.19 RTCIceCandidatePairStats dictionary § Dictionary RTCIceCandidatePairStats Members § 10. Security and Privacy Considerations § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary § Dictionary RTCIceCandidatePairStats Members Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary § Dictionary RTCIceCandidatePairStats Members Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary § Dictionary RTCIceCandidatePairStats Members Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary § Dictionary RTCIceCandidatePairStats Members Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary Permalink exported IDL Referenced in: § 8.19 RTCIceCandidatePairStats dictionary § Dictionary RTCIceCandidatePairStats Members § 8.19.1 RTCStatsIceCandidatePairState enum (2) Permalink exported IDL Referenced in: § 8.19.1 RTCStatsIceCandidatePairState enum Permalink exported IDL Referenced in: § 8.19.1 RTCStatsIceCandidatePairState enum Permalink exported IDL Referenced in: § 8.19.1 RTCStatsIceCandidatePairState enum Permalink exported IDL Referenced in: § 8.19.1 RTCStatsIceCandidatePairState enum Permalink exported IDL Referenced in: § 8.19.1 RTCStatsIceCandidatePairState enum Permalink exported IDL Referenced in: § 7.1 RTCStatsType enum § 8.20 RTCCertificateStats dictionary § Dictionary RTCCertificateStats Members § A. Summary of WebRTC stats fields per type Permalink exported IDL Referenced in: § 8.20 RTCCertificateStats dictionary Permalink exported IDL Referenced in: § 8.20 RTCCertificateStats dictionary Permalink exported IDL Referenced in: § 8.20 RTCCertificateStats dictionary Permalink exported IDL Referenced in: § 8.20 RTCCertificateStats dictionary § Dictionary RTCCertificateStats Members

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