From a728100eb2ec11961d55c4bb8b335cbff0e7d6f7 Mon Sep 17 00:00:00 2001
From: Lorenzo Miniero <lminiero@gmail.com>
Date: Thu, 21 Feb 2019 10:50:01 +0100
Subject: [PATCH] Force plan-b semantics if Chrome is < 72

---
 html/janus.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/html/janus.js b/html/janus.js
index aa86deeb66..c53758bd1d 100644
--- a/html/janus.js
+++ b/html/janus.js
@@ -1604,7 +1604,10 @@ function Janus(gatewayCallbacks) {
 		// If we still need to create a PeerConnection, let's do that
 		if(!config.pc) {
 			var pc_config = {"iceServers": iceServers, "iceTransportPolicy": iceTransportPolicy, "bundlePolicy": bundlePolicy};
-			//~ var pc_constraints = {'mandatory': {'MozDontOfferDataChannel':true}};
+			if(Janus.webRTCAdapter.browserDetails.browser === "chrome" && Janus.webRTCAdapter.browserDetails.version < 72) {
+				// For Chrome versions before 72, we force a plan-b semantic
+				pc_config["sdpSemantics"] = "plan-b";
+			}
 			var pc_constraints = {
 				"optional": [{"DtlsSrtpKeyAgreement": true}]
 			};