fix: video blink when toggling mic mute in calls

src/app/call/stores.ts

@@ -6,11 +6,13 @@ export type VoiceSession = {
   url: string
   h: string
   room: LiveKitRoom
-  muted: boolean
   cameraOn: boolean
   screenShareOn: boolean
 }
 
+/** Mic mute state is separate so toggling it does not re-render video tiles. */
+export const voiceMicMuted = writable(true)
+
 export type Pubkey = string
 
 export type VoiceParticipant = {pubkey?: Pubkey; identity: string}

src/app/call/voice.ts

@@ -22,6 +22,7 @@ import {AbortError, whenAborted, whenTimeout} from "$lib/util"
 import {
   currentVoiceRoom,
   currentVoiceSession,
+  voiceMicMuted,
   participantFromLiveKitIdentity,
   participantKey,
   participantPubkeyMap,
@@ -173,6 +174,7 @@ const setUpMicrophone = async (
 
 const onRoomDisconnected = (reason?: DisconnectReason) => {
   videoPrimaryTileKey.set(undefined)
+  voiceMicMuted.set(true)
   currentVoiceSession.set(undefined)
   resetVideoCallLayout()
   if (reason !== undefined && reason !== DisconnectReason.CLIENT_INITIATED) {
@@ -295,11 +297,11 @@ export const joinVoiceRoom = async (
 
     const muted = await setUpMicrophone(startMuted, preferredMicId, liveKitRoom.localParticipant)
 
+    voiceMicMuted.set(muted)
     currentVoiceSession.set({
       url,
       h,
       room: liveKitRoom,
-      muted,
       cameraOn: false,
       screenShareOn: false,
     })
@@ -339,6 +341,7 @@ export const leaveVoiceRoom = async () => {
 
   voiceState.set(VoiceState.Disconnected)
   videoPrimaryTileKey.set(undefined)
+  voiceMicMuted.set(true)
   currentVoiceSession.set(undefined)
   resetVideoCallLayout()
   session.room.disconnect()
@@ -356,18 +359,18 @@ export const toggleMute = async () => {
   const session = get(currentVoiceSession)
   if (!session) return
 
-  const muted = !session.muted
+  const muted = !get(voiceMicMuted)
+  voiceMicMuted.set(muted)
   if (muted) {
     // Disable and re-enable microphone to trigger permission prompt
     session.room.localParticipant.setMicrophoneEnabled(false)
-    currentVoiceSession.set({...session, muted})
     return
   }
 
   try {
     await session.room.localParticipant.setMicrophoneEnabled(true)
-    currentVoiceSession.set({...session, muted})
   } catch (e) {
+    voiceMicMuted.set(true)
     pushToast({theme: "error", message: "Could not access microphone"})
   }
 }

src/app/components/VoiceWidget.svelte

@@ -41,6 +41,7 @@
     VoiceState,
     currentVoiceSession,
     currentVoiceRoom,
+    voiceMicMuted,
     voiceState,
     isLocalSpeaking,
   } from "@app/call/stores"
@@ -183,18 +184,18 @@
         </Button>
       {:else if $voiceState === VoiceState.Connected && $currentVoiceSession}
         <Button
-          data-tip={$currentVoiceSession.muted ? "Unmute" : "Mute"}
+          data-tip={$voiceMicMuted ? "Unmute" : "Mute"}
           class={cx(
             mediaToggleClass,
             "overflow-visible",
-            !$currentVoiceSession.muted && $isLocalSpeaking && "text-primary",
+            !$voiceMicMuted && $isLocalSpeaking && "text-primary",
-            $currentVoiceSession.muted &&
+            $voiceMicMuted &&
               "text-error ring-1 ring-error/50 ring-offset-0 ring-offset-base-100",
           )}
           onclick={toggleMute}>
           <span class="relative inline-flex items-center justify-center overflow-visible">
             <Icon icon={Microphone} size={4} />
-            {#if $currentVoiceSession.muted}
+            {#if $voiceMicMuted}
               <span
                 class="pointer-events-none absolute inset-0 flex items-center justify-center overflow-visible"
                 aria-hidden="true">