Factor video code and stores out of voice.ts

src/app/call/video.ts

@@ -0,0 +1,105 @@
+import {Track} from "livekit-client"
+import {MediaQuery} from "svelte/reactivity"
+import {derived, get, writable} from "svelte/store"
+import {currentVoiceSession, VoiceState, type VoiceSession, voiceState} from "@app/call/stores"
+import {pushToast} from "@app/util/toast"
+
+export enum VideoCallLayout {
+  Chat = "chat",
+  Video = "video",
+  Split = "split",
+}
+
+export const isDesktopLayout = new MediaQuery("min-width: 768px", false)
+
+export enum ViewportSize {
+  Desktop = "desktop",
+  Mobile = "mobile",
+}
+
+export const videoCallViewportSync = {
+  previousLayout: undefined as ViewportSize | undefined,
+}
+
+export const videoCallLayout = writable<VideoCallLayout>(VideoCallLayout.Split)
+
+export const resetVideoCallLayout = () => {
+  videoCallViewportSync.previousLayout = undefined
+  videoCallLayout.set(VideoCallLayout.Chat)
+}
+
+export const videoPrimaryTileKey = writable<string | undefined>(undefined)
+
+export const toggleVideoPrimaryTile = (key: string) => {
+  videoPrimaryTileKey.update(k => (k === key ? undefined : key))
+}
+
+const VISUAL_SOURCES = [Track.Source.Camera, Track.Source.ScreenShare] as const
+
+const countLiveVisualFeeds = (session: VoiceSession): number => {
+  const room = session.room
+  let n = 0
+  const lp = room.localParticipant
+  if (session.cameraOn) {
+    const pub = lp.getTrackPublication(Track.Source.Camera)
+    if (pub?.track) n += 1
+  }
+  if (session.screenShareOn) {
+    const pub = lp.getTrackPublication(Track.Source.ScreenShare)
+    if (pub?.track) n += 1
+  }
+  for (const rp of room.remoteParticipants.values()) {
+    for (const source of VISUAL_SOURCES) {
+      const pub = rp.getTrackPublication(source)
+      if (pub?.isSubscribed && pub.track) n += 1
+    }
+  }
+  return n
+}
+
+export const triggerVideoFeedCount = () => {
+  currentVoiceSession.update(s => (s ? {...s} : s))
+}
+
+export const videoTileCount = derived([currentVoiceSession, voiceState], ([$session, $state]) => {
+  if ($state !== VoiceState.Connected || !$session) return 0
+  return countLiveVisualFeeds($session)
+})
+
+export const toggleCamera = async () => {
+  const session = get(currentVoiceSession)
+  if (!session) return
+
+  const cameraOn = !session.cameraOn
+  if (!cameraOn) {
+    session.room.localParticipant.setCameraEnabled(false)
+    currentVoiceSession.set({...session, cameraOn})
+    return
+  }
+
+  try {
+    await session.room.localParticipant.setCameraEnabled(true)
+    currentVoiceSession.set({...session, cameraOn})
+  } catch (e) {
+    pushToast({theme: "error", message: "Could not access camera"})
+  }
+}
+
+export const toggleScreenShare = async () => {
+  const session = get(currentVoiceSession)
+  if (!session) return
+
+  const screenShareOn = !session.screenShareOn
+  if (!screenShareOn) {
+    session.room.localParticipant.setScreenShareEnabled(false)
+    currentVoiceSession.set({...session, screenShareOn})
+    return
+  }
+
+  try {
+    await session.room.localParticipant.setScreenShareEnabled(true)
+    currentVoiceSession.set({...session, screenShareOn})
+  } catch (e) {
+    pushToast({theme: "error", message: "Could not start screen sharing"})
+  }
+}