WebRTC Metrics

Abstract	WebRTC Metrics
Category	Learning note
Authors	Walter Fan
Status	WIP
Updated	2024-08-21

Overview 

WebRTC 提供了 webrtc_stats, 包含了诸多层面的指标, 浏览器提供了 getStats() API， Native SDK 需要调用类似的接口。

我们如果要计算在一段区间内的 metrics , 还需要做些计算。因为大多数的指标都是线性增长的，所以要把上一次取得的数据缓存下来，将这一次取得的指标减去上一次的指标

例如:

packetsSent = currentPacketsSent - previousPacketsSent

frameRateReceived = (currentFramesReceived - previousFramesReceived)/(currentTimeMs - previousTimeMs)/1000

Considerations for Selecting RTCP Extended Report (XR) Metrics for the WebRTC Statistics API 

network impact metrics,
application impact metrics, and
recovery metrics
RFC3611 RTP Control Protocol Extended Reports (RTCP XR)
rfc6958 burst/gap loss metric reporting
rfc7003 burst/gap discard metric reporting
rfc6776 Measurement Identity and Information Reporting Using a SDES Item and an RTCP Extended Report (XR) Block