From 134aac16fdb757b35449792260f0214bff05d3ed Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sa=C3=BAl=20Ibarra=20Corretg=C3=A9?= <s@saghul.net>
Date: Thu, 15 Aug 2024 12:01:55 +0200
Subject: [PATCH] fix(ReceiveVideoController) fix setting lastN to 0

When lastN is first set to some truty value and then 0, it wouldn't be
set because we relied on a "truthyness" check.

Check if the value is undefined so it can be set to 0.
---
 modules/qualitycontrol/ReceiveVideoController.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/modules/qualitycontrol/ReceiveVideoController.js b/modules/qualitycontrol/ReceiveVideoController.js
index cc21d2e5a4..9a78fa8826 100644
--- a/modules/qualitycontrol/ReceiveVideoController.js
+++ b/modules/qualitycontrol/ReceiveVideoController.js
@@ -213,7 +213,8 @@ export default class ReceiveVideoController {
             this._receiverVideoConstraints = constraints;
 
             this._assumedBandwidthBps = constraints.assumedBandwidthBps ?? this._assumedBandwidthBps;
-            this._lastN = constraints.lastN && !this._lastNLimitedByCpu ? constraints.lastN : this._lastN;
+            this._lastN = typeof constraints.lastN !== 'undefined' && !this._lastNLimitedByCpu
+                ? constraints.lastN : this._lastN;
             this._receiverVideoConstraints.lastN = this._lastN;
             this._receiveResolutionLimitedByCpu && this._updateIndividualConstraints();