From 204c82dfd14dbc0b5ee898967497e93931043f10 Mon Sep 17 00:00:00 2001
From: Philipp Hancke <phancke@microsoft.com>
Date: Thu, 22 Feb 2024 08:05:05 +0100
Subject: [PATCH] e2ee: fix setCodecPreferences capabilities check

---
 .../insertable-streams/endtoend-encryption/js/main.js        | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/content/insertable-streams/endtoend-encryption/js/main.js b/src/content/insertable-streams/endtoend-encryption/js/main.js
index b4b20c9f2..a0ef59c5d 100644
--- a/src/content/insertable-streams/endtoend-encryption/js/main.js
+++ b/src/content/insertable-streams/endtoend-encryption/js/main.js
@@ -47,6 +47,9 @@ let preferredAudioCodecMimeType = 'audio/opus';
 // eslint-disable-next-line prefer-const
 let preferredVideoCodecMimeType = 'video/VP8';
 
+const supportsSetCodecPreferences = window.RTCRtpTransceiver &&
+  'setCodecPreferences' in window.RTCRtpTransceiver.prototype;
+
 let hasEnoughAPIs = !!window.RTCRtpScriptTransform;
 
 if (!hasEnoughAPIs) {
@@ -150,7 +153,7 @@ function setupReceiverTransform(receiver) {
 }
 
 function maybeSetCodecPreferences(trackEvent) {
-  if (!'setCodecPreferences' in window.RTCRtpTransceiver.prototype) return;
+  if (!supportsSetCodecPreferences) return;
   if (trackEvent.track.kind === 'audio' && preferredAudioCodecMimeType ) {
     const {codecs} = RTCRtpReceiver.getCapabilities('audio');
     const selectedCodecIndex = codecs.findIndex(c => c.mimeType === preferredAudioCodecMimeType);