CODEWITHSUNDEEP
javascriptwebrtc
str
str

Reputation: 44969

Detect offline peer in WebRTC connection

We are developing a video stream from a mobile device to a computer using WebRTC. The mobile device might lose its connection completely and the computer should be able to detect that. Right now, the video just freezes. But neither of the EventHandlers of RTCPeerConnection are called in such a situation.

Upvotes: 7

Views: 5470

Answers (2)

jib
jib

Reputation: 42430

As a workaround in Firefox, you could use getStats to detect if packets stop coming in:

var findStat = (m, type) => [...m.values()].find(s => s.type == type && !s.isRemote);

var hasConnected = new Promise(resolve => pc.oniceconnectionstatechange =
  e => pc.iceConnectionState == "connected" && resolve());

var hasDropped = hasConnected.then(() => new Promise(resolve => {
  var lastPackets = countdown = 0, timeout = 3; // seconds

  var iv = setInterval(() => pc.getStats().then(stats => {
    var packets = findStat(stats, "inbound-rtp").packetsReceived;
    countdown = (packets - lastPackets)? timeout : countdown - 1;
    if (!countdown) resolve(clearInterval(iv)); 
    lastPackets = packets;
  }), 1000);
}));

Here's a demo: https://jsfiddle.net/4rzhe7n8/

Upvotes: 10

Philipp Hancke
Philipp Hancke

Reputation: 17265

the iceconnectionstatechange handler should fire after ~5-10 seconds of not receiving data from the peer anymore (in Chrome; Firefox is working on that currently). See https://webrtc.github.io/samples/src/content/peerconnection/states/ for an example.

Upvotes: 9

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