From b814efc21f354121035bc8a9528657b96a745b4c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Mon, 10 Jul 2023 16:51:33 +0200
Subject: [PATCH] Add a comment
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Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 src/room/VideoPreview.tsx | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/room/VideoPreview.tsx b/src/room/VideoPreview.tsx
index 3cc773b3..beeea010 100644
--- a/src/room/VideoPreview.tsx
+++ b/src/room/VideoPreview.tsx
@@ -152,6 +152,11 @@ export function VideoPreview({ matrixInfo, onUserChoicesChanged }: Props) {
         setInitializingAudio(false);
       }
       audioTrack?.getDeviceId().then((audioId) => {
+        // getDeviceId() can return undefined for audio devices. This happens if
+        // the devices list uses "default" as the device id for the current
+        // device and the device set on the track also uses the deviceId
+        // "default". Check `normalizeDeviceId` in  `getDeviceId` for more
+        // details.
         audioIn.setSelected(audioId ?? "default");
       });
     }