javascript - What is the current bandwidth or quality of an audio MediaStream in a browser? (WebRTC) -


i'm building webrtc application , want gather statistics in order rate solution. 1 metric i'm interested in current bandwidth of received audio (and video) stream. able find used codec @ chrome://webrtc-internals/ (opus), wasn't able find numbers current quality/bandwidth of stream (e.g. 128kbit/s).

i searched rtcpeerconnection object such numbers, haven't found some. xxx.rtcconnection.getremotestreams()[0].getaudiotracks()[0].getconstraints() returns 

{    deviceid: {},    echocancellation: {},    facingmode: {},    framerate: {},    height: {},    mediasource: "camera",    mozautogaincontrol: {},    moznoisesuppression: {},    viewportheight: {},    viewportoffsetx: {},    ... }

that contains information video stream (funnily requested audio stream) , no bandwidth details. there no other streams arrays in example above. know need current quality/bandwidth of mediastream?

you need use rtcpeerconnection.getstats() api, search bytesreceived , calculate bitrate difference of bytesreceived between 2 calls. this shows complete example.


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