From 346f93dd16aeb00a12658023037c56394834a0af Mon Sep 17 00:00:00 2001
From: Juliusz Chroboczek <jch@irif.fr>
Date: Thu, 10 Sep 2020 01:13:15 +0200
Subject: [PATCH] Maintain information about whether renegotiation is
 permitted.

Renegotiation is not correct when the stream is fresh, for example
after the user has switched the camera.
---
 static/protocol.js | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/static/protocol.js b/static/protocol.js
index b64a89d..787d9a6 100644
--- a/static/protocol.js
+++ b/static/protocol.js
@@ -701,6 +701,13 @@ function Stream(sc, id, pc) {
      * @type {Array.<RTCIceCandidate>}
      */
     this.iceCandidates = [];
+    /**
+     * Indicates whether it is legal to renegotiate at this point.  If
+     * this is false, a new connection must be negotiated.
+     *
+     * @type {boolean}
+     */
+    this.renegotiate = false;
     /**
      * The statistics last computed by the stats handler.  This is
      * a dictionary indexed by track id, with each value a disctionary of
@@ -854,11 +861,12 @@ Stream.prototype.negotiate = async function (restartIce) {
 
     c.sc.send({
         type: 'offer',
-        kind: 'renegotiate',
+        kind: this.renegotiate ? 'renegotiate' : '',
         id: c.id,
         labels: c.labelsByMid,
         offer: offer,
     });
+    this.renegotiate = true;
 }
 
 /**