Split MediaViewModel into multiple files

src/state/media/UserMediaViewModel.ts

@@ -0,0 +1,143 @@
+/*
+Copyright 2023, 2024 New Vector Ltd.
+Copyright 2026 Element Creations Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE in the repository root for full details.
+*/
+
+import {
+  combineLatest,
+  map,
+  type Observable,
+  of,
+  Subject,
+  switchMap,
+} from "rxjs";
+import {
+  observeParticipantEvents,
+  observeParticipantMedia,
+} from "@livekit/components-core";
+import { ParticipantEvent, Track } from "livekit-client";
+
+import { type ReactionOption } from "../../reactions";
+import { type Behavior } from "../Behavior";
+import { type LocalUserMediaViewModel } from "./LocalUserMediaViewModel";
+import {
+  createMemberMedia,
+  type MemberMediaInputs,
+  type MemberMediaViewModel,
+} from "./MemberMediaViewModel";
+import { type RemoteUserMediaViewModel } from "./RemoteUserMediaViewModel";
+import { type ObservableScope } from "../ObservableScope";
+import { createToggle$ } from "../../utils/observable";
+import { showConnectionStats } from "../../settings/settings";
+import { observeRtpStreamStats$ } from "./observeRtpStreamStats";
+
+/**
+ * A participant's user media (i.e. their microphone and camera feed).
+ */
+export type UserMediaViewModel =
+  | LocalUserMediaViewModel
+  | RemoteUserMediaViewModel;
+
+export interface BaseUserMediaViewModel extends MemberMediaViewModel {
+  type: "user";
+  speaking$: Behavior<boolean>;
+  audioEnabled$: Behavior<boolean>;
+  videoEnabled$: Behavior<boolean>;
+  cropVideo$: Behavior<boolean>;
+  toggleCropVideo: () => void;
+  /**
+   * The expected identity of the LiveKit participant. Exposed for debugging.
+   */
+  rtcBackendIdentity: string;
+  handRaised$: Behavior<Date | null>;
+  reaction$: Behavior<ReactionOption | null>;
+  audioStreamStats$: Observable<
+    RTCInboundRtpStreamStats | RTCOutboundRtpStreamStats | undefined
+  >;
+  videoStreamStats$: Observable<
+    RTCInboundRtpStreamStats | RTCOutboundRtpStreamStats | undefined
+  >;
+}
+
+export interface BaseUserMediaInputs extends Omit<
+  MemberMediaInputs,
+  "audioSource" | "videoSource"
+> {
+  rtcBackendIdentity: string;
+  handRaised$: Behavior<Date | null>;
+  reaction$: Behavior<ReactionOption | null>;
+  statsType: "inbound-rtp" | "outbound-rtp";
+}
+
+export function createBaseUserMedia(
+  scope: ObservableScope,
+  {
+    rtcBackendIdentity,
+    handRaised$,
+    reaction$,
+    statsType,
+    ...inputs
+  }: BaseUserMediaInputs,
+): BaseUserMediaViewModel {
+  const { participant$ } = inputs;
+  const media$ = scope.behavior(
+    participant$.pipe(
+      switchMap((p) => (p && observeParticipantMedia(p)) ?? of(undefined)),
+    ),
+  );
+  const toggleCropVideo$ = new Subject<void>();
+
+  return {
+    ...createMemberMedia(scope, {
+      ...inputs,
+      audioSource: Track.Source.Microphone,
+      videoSource: Track.Source.Camera,
+    }),
+    type: "user",
+    speaking$: scope.behavior(
+      participant$.pipe(
+        switchMap((p) =>
+          p
+            ? observeParticipantEvents(
+                p,
+                ParticipantEvent.IsSpeakingChanged,
+              ).pipe(map((p) => p.isSpeaking))
+            : of(false),
+        ),
+      ),
+    ),
+    audioEnabled$: scope.behavior(
+      media$.pipe(map((m) => m?.microphoneTrack?.isMuted === false)),
+    ),
+    videoEnabled$: scope.behavior(
+      media$.pipe(map((m) => m?.cameraTrack?.isMuted === false)),
+    ),
+    cropVideo$: createToggle$(scope, true, toggleCropVideo$),
+    toggleCropVideo: () => toggleCropVideo$.next(),
+    rtcBackendIdentity,
+    handRaised$,
+    reaction$,
+    audioStreamStats$: combineLatest([
+      participant$,
+      showConnectionStats.value$,
+    ]).pipe(
+      switchMap(([p, showConnectionStats]) => {
+        //
+        if (!p || !showConnectionStats) return of(undefined);
+        return observeRtpStreamStats$(p, Track.Source.Microphone, statsType);
+      }),
+    ),
+    videoStreamStats$: combineLatest([
+      participant$,
+      showConnectionStats.value$,
+    ]).pipe(
+      switchMap(([p, showConnectionStats]) => {
+        if (!p || !showConnectionStats) return of(undefined);
+        return observeRtpStreamStats$(p, Track.Source.Camera, statsType);
+      }),
+    ),
+  };
+}