RTCStatsReport

RTCStatsReport 接口提供了通过调用 RTCPeerConnection.getStats(), RTCRtpReceiver.getStats()，和 RTCRtpSender.getStats() 这三个方法之一所获得的统计报告。该统计报告包含统计类别字符串名称到包含相应统计数据的对象的映射。

在 RTCPeerConnection 上调用 getStats() 可以指定是希望获取连接上的出站，入站还是所有流的统计信息。 getStats() 的 RTCRtpReceiver 和 RTCRtpSender 版本仅返回可用于调用它们的传入或传出流的统计信息。

对于每种统计信息类别，都有一个字典，字典的属性提供相关信息。

所有 WebRTC 统计对象都基于 RTCStats 字典，该字典提供了最基本的信息：时间戳，统计类型字符串和唯一标识数据源的ID：

id

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

timestamp

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

type

A DOMString indicating the type of statistics the object contains, taken from the enum type RTCStatsType.

type 给出了对象所代表的统计类别的名称，以及如何查找所需的特定数据类型。统计类别名称是枚举类 RTCStatsType 的成员，如下所示：

candidate-pair

An RTCIceCandidatePairStats object providing statistics related to an RTCIceTransport. Candidate pairs other than the currently active pair for the transport are deleted when the RTCPeerConnection changes its RTCPeerConnection.iceGatheringState to new during an ICE restart. The active candidate pair is deleted after the transport switches to another candidate pair; this change cannot be detected otherwise.

certificate

An RTCCertificateStats object providing statistics related to a certificate being used by an RTCIceTransport.

codec

An RTCCodecStats object containing statistics about a codec currently being used by RTP streams to send or receive data for the RTCPeerConnection.

csrc

An RTCContributingSourceStats object which contains statistics related to a contributing source (CSRC) that contributed to an inbound RTP stream.

data-channel

An RTCDataChannelStats object which contains statistics about each RTCDataChannel on the connection.

inbound-rtp

An RTCInboundRtpStreamStats object providing statistics about inbound data being received from remote peers. Since this only provides statistics related to inbound data, without considering the local peer's state, any values that require knowledge of both, such as round-trip time, is not included. This report isn't available if there are no connected peers.

local-candidate

An RTCIceCandidateStats object giving statistics about an ICE local candidate; these candidates are found in the output from RTCIceTransport.getLocalCandidates().

outbound-rtp

The report is an RTCOutboundRtpStreamStats object providing statistics based on the local peer's outgoing data being sent to its peers. This information considers only the outbound RTP stream, so any data which requires information about the state of the remote peers (such as round-trip time) is unavailable, since those values can't be computed without knowing about the other peers' states.

peer-connection

A RTCPeerConnectionStats object provides statistics related to the overall peer connection's RTCPeerConnection.

receiver

Provides statistics about a specific RTCRtpReceiver. The statistics object is an RTCAudioReceiverStats object if kind is audio; if kind is video, the object is an RTCVideoReceiverStats object.

remote-candidate

The report is an RTCIceCandidateStats object containing statistics about the remote candidate's RTCIceTransport. This may include information such as the type of network, the protocol, the URL, the type of relay being used, and so forth.

remote-inbound-rtp

The report is an RTCRemoteInboundRtpStreamStats object providing statistics about your outbound RTP data stream, but from the perspective of the remote peer. That is, this information is about your outbound-rtp stream, but as seen by the remote device that's handling the stream. You can use this information to do things like determine how well the remote peer is receiving data.

remote-outbound-rtp

The report is an RTCRemoteOutboundRtpStreamStats object that contains statistics about your inbound RTP (inbound-rtp) stream, but from the perspective of the remote peer.

sender

An object containing statistics about the RTCRtpSender for a stream on the RTCPeerConnection. If kind is "audio", this object is of type RTCAudioSenderStats; if kind is "video", this is an RTCVideoSenderStats object.

stream

An object of type RTCMediaStreamStats, providing statistics and information about a MediaStream which is part of the RTCPeerConnection.

track

The object is one of the types based on RTCMediaHandlerStats: for audio tracks, the type is RTCSenderAudioTrackAttachmentStats and for video tracks, the type is RTCSenderVideoTrackAttachmentStats. The data within provides statistics related to a particular MediaStreamTrack's attachment to an RTCRtpSender; also included are the media level metrics that go along with the track.

transport

An object that contains statistics related to a transport for an RTCPeerConnection. The object is of type RTCTransportStats.

... 即将到来 ...

• WebRTC API
• RTCPeerConnection
• RTCPeerConnection.getStats(), RTCRtpReceiver.getStats(), and RTCRtpSender.getStats()