fix(video): show avatar tiles for audio-only and camera-off callers (#325)

Co-authored-by: Aditya Chaudhary <30+useradityaa@noreply.coracle.social>
Co-committed-by: Aditya Chaudhary <30+useradityaa@noreply.coracle.social>

src/app/call.ts

@@ -131,7 +131,7 @@ export const videoCallLayout = writable<VideoCallLayout>(VideoCallLayout.Split)
 export const videoPrimaryTileKey = writable<string | undefined>(undefined)
 
 export const videoTileCount = derived(
-  [currentCallSession, callState, videoTrackRevision],
+  [currentCallSession, callState, videoTrackRevision, participantMediaState],
   ([$session, $state]) => {
     if ($state !== CallState.Connected || !$session) return 0
     return countLiveVisualFeeds($session)
@@ -478,7 +478,7 @@ const countLiveVisualFeeds = (session: CallSession): number => {
   for (const rp of livekit.remoteParticipants.values()) {
     for (const source of VISUAL_SOURCES) {
       const pub = rp.getTrackPublication(source)
-      if (pub?.isSubscribed && pub.track) n += 1
+      if (pub?.isSubscribed && pub.track && !pub.isMuted) n += 1
     }
   }
   return n

src/app/components/VideoCallContent.svelte

@@ -21,7 +21,9 @@
     currentCallSession,
     callTargetRoom,
     mediaStateByIdentity,
+    participantMediaState,
     pubkeyFromLiveKitIdentity,
+    videoTrackRevision,
   } from "@app/call"
 
   type Props = {
@@ -74,6 +76,10 @@
 
   const videoTiles = $derived.by(() => {
     const session = $currentCallSession
+    // LiveKit mutates remoteParticipants/tracks in place; these stores are what
+    // actually change on join/leave and track subscribe/unsubscribe.
+    void $participantMediaState
+    void $videoTrackRevision
     if (!session || $callTargetRoom?.url !== url || $callTargetRoom?.h !== h) {
       return []
     }
@@ -106,7 +112,8 @@
 
     for (const rp of livekit.remoteParticipants.values()) {
       const camPub = rp.getTrackPublication(Track.Source.Camera)
-      if (camPub?.isSubscribed && camPub.track) {
+      // Camera off mutes the publication rather than unsubscribing; still render avatar.
+      if (camPub?.isSubscribed && camPub.track && !camPub.isMuted) {
         videoTiles.push({
           liveKitIdentity: rp.identity,
           isLocal: false,
@@ -116,7 +123,7 @@
         })
       }
       const screenPub = rp.getTrackPublication(Track.Source.ScreenShare)
-      if (screenPub?.isSubscribed && screenPub.track) {
+      if (screenPub?.isSubscribed && screenPub.track && !screenPub.isMuted) {
         videoTiles.push({
           liveKitIdentity: rp.identity,
           isLocal: false,
@@ -290,10 +297,7 @@
   {:else}
     <div
       class="flex min-h-[12rem] flex-1 flex-col items-center justify-center gap-2 rounded-2xl bg-surface p-4 text-center text-sm opacity-80">
-      <p>No one is sharing video yet.</p>
-      <p class="text-xs">
-        Participants appear here when they turn on their camera or share their screen.
-      </p>
+      <p>Waiting for participants…</p>
     </div>
   {/if}
 {/snippet}