WIP on audio route experiment

src/UrlParams.ts

@@ -196,6 +196,7 @@ export interface UrlConfiguration {
    * Element Call.
    */
   controlledAudioDevices: boolean;
+  audioInputOutputSelection: boolean;
   /**
    * Setting this flag skips the lobby and brings you in the call directly.
    * In the widget this can be combined with preload to pass the device settings
@@ -372,6 +373,7 @@ export const computeUrlParams = (search = "", hash = ""): UrlParams => {
     allowIceFallback: true,
     perParticipantE2EE: true,
     controlledAudioDevices: platform === "desktop" ? false : true,
+    audioInputOutputSelection: platform !== "ios",
     skipLobby: true,
     returnToLobby: false,
     sendNotificationType: "notification",
@@ -427,6 +429,7 @@ export const computeUrlParams = (search = "", hash = ""): UrlParams => {
         allowIceFallback: false,
         perParticipantE2EE: false,
         controlledAudioDevices: false,
+        audioInputOutputSelection: true,
         skipLobby: false,
         returnToLobby: false,
         sendNotificationType: undefined,

src/button/AudioRouteButton.tsx

@@ -0,0 +1,60 @@
+/*
+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 { useTranslation } from "react-i18next";
+import { Button, Tooltip } from "@vector-im/compound-web";
+import {
+  EarpieceIcon,
+  HeadphonesSolidIcon,
+  VolumeOnSolidIcon,
+} from "@vector-im/compound-design-tokens/assets/web/icons";
+
+import type { ComponentPropsWithoutRef, FC } from "react";
+import { RouteType } from "../controls.ts";
+
+interface AudioRouteButtonProps extends ComponentPropsWithoutRef<"button"> {
+  size?: "md" | "lg";
+  routeType: RouteType;
+}
+
+export const AudioRouteButton: FC<AudioRouteButtonProps> = ({
+  routeType,
+  ...props
+}) => {
+  const { t } = useTranslation();
+  let label: string
+  let icon;
+  switch(routeType) {
+    case RouteType.speaker:
+      label = t("settings.devices.loudspeaker")
+      icon = VolumeOnSolidIcon;
+      break;
+    case RouteType.phone:
+      label = t("settings.devices.handset");
+      icon = EarpieceIcon
+      break;
+    case RouteType.bluetooth:
+      label = "bluetooth headset";
+      icon = HeadphonesSolidIcon;
+      break;
+    case RouteType.wired:
+      label = "headset";
+      icon = HeadphonesSolidIcon;
+      break;
+  }
+
+  return (
+    <Tooltip label={label}>
+      <Button
+        iconOnly
+        Icon={icon}
+        {...props}
+        kind={"primary"}
+      />
+    </Tooltip>
+  );
+};

src/components/CallFooter.tsx

@@ -34,6 +34,7 @@ import {
   MediaMuteAndSwitchButton,
   type MenuOptions,
 } from "./MediaMuteAndSwitchButton";
+import { type AudioRoute, RouteType } from "../controls.ts";
 
 export interface AudioOutputSwitcher {
   targetOutput: string;
@@ -90,6 +91,8 @@ export interface FooterProps {
   selectedVideo?: string;
   selectAudioDevice?: (deviceId: string) => void;
   selectVideoDevice?: (deviceId: string) => void;
+
+  nativeAudioRoute?: { targetOutput: AudioRoute , switch: () => void };
 }
 
 export const CallFooter: FC<FooterProps> = ({
@@ -112,6 +115,7 @@ export const CallFooter: FC<FooterProps> = ({
   reactionIdentifier,
   reactionData,
   audioOutputSwitcher,
+  nativeAudioRoute,
   hangup,
   debugTileLayout,
   tileStoreGeneration,
@@ -228,15 +232,30 @@ export const CallFooter: FC<FooterProps> = ({
 
   // In this PR we just move the button to the bottom bar. We do not yet update its appearance
   const audioOutputButton = useMemo(() => {
-    if (audioOutputSwitcher === undefined) return null;
+
-    return (
+    if (nativeAudioRoute) {
-      <LoudspeakerButton
+      return (
-        size={buttonSize}
+        // TODO make a 4 state button to also include the headset option when supported by the OS
-        onClick={() => audioOutputSwitcher.switch()}
+        <LoudspeakerButton
-        loudspeakerModeEnabled={audioOutputSwitcher.targetOutput === "earpiece"}
+          size={buttonSize}
-      />
+          onClick={() => nativeAudioRoute.switch()}
-    );
+          loudspeakerModeEnabled={nativeAudioRoute.targetOutput.type === RouteType.speaker}
-  }, [audioOutputSwitcher, buttonSize]);
+        />
+      );
+    } else {
+      if (audioOutputSwitcher === undefined) return null;
+      return (
+        <LoudspeakerButton
+          size={buttonSize}
+          onClick={() => audioOutputSwitcher.switch()}
+          loudspeakerModeEnabled={
+            audioOutputSwitcher.targetOutput === "earpiece"
+          }
+        />
+      );
+    }
+  }, [audioOutputSwitcher, buttonSize, nativeAudioRoute]);
+
 
   if (audioOutputButton) buttons.push(audioOutputButton);
 

src/controls.ts

@@ -8,6 +8,18 @@ Please see LICENSE in the repository root for full details.
 import { Subject } from "rxjs";
 import { logger } from "matrix-js-sdk/lib/logger";
 
+export enum RouteType {
+  speaker = "speaker",
+  phone = "phone",
+  bluetooth = "bluetooth",
+  wired = "wired",
+}
+
+export interface AudioRoute {
+  type: RouteType;
+  label: string;
+}
+
 export interface Controls {
   canEnterPip(): boolean;
   enablePip(): void;
@@ -31,6 +43,9 @@ export interface Controls {
   setOutputEnabled(enabled: boolean): void;
   /** @deprecated use  showNativeAudioDevicePicker instead*/
   showNativeOutputDevicePicker?: () => void;
+
+  /** iOS native controlled device selection */
+  onNativeRouteChanged(route: AudioRoute): void;
 }
 
 /**
@@ -93,6 +108,8 @@ export const outputDevice$ = new Subject<string>();
  */
 export const setAudioEnabled$ = new Subject<boolean>();
 
+export const currentRoute$ = new Subject<AudioRoute | null>();
+
 let playbackStartedEmitted = false;
 export const setPlaybackStarted = (): void => {
   if (!playbackStartedEmitted) {
@@ -101,6 +118,10 @@ export const setPlaybackStarted = (): void => {
   }
 };
 
+export const showNativeAudioDevicePicker = (): void => {
+  window.controls.showNativeAudioDevicePicker?.();
+};
+
 window.controls = {
   canEnterPip(): boolean {
     return setPipEnabled$.observed;
@@ -156,6 +177,14 @@ window.controls = {
     setAudioEnabled$.next(enabled);
   },
 
+  onNativeRouteChanged(route: AudioRoute): void {
+    logger.info(
+      "[MediaDevices controls] onNativeRouteChanged called from native",
+      route,
+    );
+    currentRoute$.next(route);
+  },
+
   // wrappers for the deprecated controls fields
   setOutputEnabled(enabled: boolean): void {
     this.setAudioEnabled(enabled);

src/main.tsx

@@ -31,7 +31,7 @@ window.setLKLogLevel = setLKLogLevel;
 initRageshake().catch((e) => {
   logger.error("Failed to initialize rageshake", e);
 });
-setLKLogLevel("info");
+setLKLogLevel("trace");
 setLKLogExtension((level, msg, context) => {
   // we pass a synthetic logger name of "livekit" to the rageshake to make it easier to read
   global.mx_rage_logger.log(level, "livekit", msg, context);

src/room/InCallView.tsx

@@ -248,6 +248,7 @@ export const InCallView: FC<InCallViewProps> = ({
   const showFooter = useBehavior(vm.showFooter$);
   const earpieceMode = useBehavior(vm.earpieceMode$);
   const audioOutputSwitcher = useBehavior(vm.audioOutputSwitcher$);
+  const nativeAudioRoute = useBehavior(vm.nativeAudioRouteSwitcher$);
   const sharingScreen = useBehavior(vm.sharingScreen$);
 
   const fatalCallError = useBehavior(vm.fatalError$);
@@ -590,6 +591,7 @@ export const InCallView: FC<InCallViewProps> = ({
       reactionIdentifier={`${client.getUserId()}:${client.getDeviceId()}`}
       reactionData={supportsReactions ? vm : undefined}
       audioOutputSwitcher={audioOutputSwitcher ?? undefined}
+      nativeAudioRoute = { nativeAudioRoute ?? undefined}
       // Only pass the openSettings function if the settings button is not in the app bar.
       // If there is no fn the button will be hidden in the footer.
       openSettings={settingsButtonInAppBar ? undefined : openSettings}

src/room/LobbyView.tsx

@@ -26,6 +26,7 @@ import {
 } from "livekit-client";
 import { useObservableEagerState } from "observable-hooks";
 import { useNavigate } from "react-router-dom";
+import { map, startWith } from "rxjs";
 
 import inCallStyles from "./InCallView.module.css";
 import styles from "./LobbyView.module.css";
@@ -48,6 +49,14 @@ import { getValue } from "../utils/observable";
 import { useBehavior } from "../useBehavior";
 import { CallFooter } from "../components/CallFooter";
 import { useCallViewKeyboardShortcuts } from "../useCallViewKeyboardShortcuts";
+import {
+  type AudioRoute,
+  currentRoute$,
+  RouteType,
+  showNativeAudioDevicePicker,
+} from "../controls.ts";
+import { ObservableScope } from "../state/ObservableScope.ts";
+import { startsWith } from "lodash-es";
 
 interface Props {
   client: MatrixClient;
@@ -184,6 +193,39 @@ export const LobbyView: FC<Props> = ({
 
   useTrackProcessorSync(videoTrack);
 
+  const [nativeAudioRoute, setNativeAudioRoute] = useState<{
+    targetOutput: AudioRoute
+    switch: () => void
+  } | null>();
+  useEffect(() => {
+    const scope = new ObservableScope();
+    const nativeAudioRouteSwitcher$ = scope.behavior<{
+      targetOutput: AudioRoute;
+      switch: () => void;
+    } | null>(
+      currentRoute$.pipe(
+        map((route) => {
+          return {
+            targetOutput: route || { type: RouteType.speaker, label: "" },
+            switch: (): void => {
+              showNativeAudioDevicePicker?.();
+            },
+          };
+        }),
+        startWith(null),
+      ),
+    );
+
+    nativeAudioRouteSwitcher$.subscribe((route) => {
+      setNativeAudioRoute(route);
+    });
+    return (): void => {
+      scope.end();
+    };
+  }, [setNativeAudioRoute]);
+
+
+
   // TODO: Unify this component with InCallView, so we can get slick joining
   // animations and don't have to feel bad about reusing its CSS
   return (
@@ -234,6 +276,7 @@ export const LobbyView: FC<Props> = ({
           toggleVideo={toggleVideo ?? undefined}
           openSettings={openSettings}
           hangup={!confineToRoom ? onLeaveClick : undefined}
+          nativeAudioRoute={nativeAudioRoute ?? undefined}
           // Logo and header are connected. We will only show the logo in SPA with header.
           hideLogo={hideHeader}
         >

src/state/CallViewModel/CallViewModel.ts

@@ -41,9 +41,9 @@ import {
 } from "rxjs";
 import { logger as rootLogger } from "matrix-js-sdk/lib/logger";
 import {
-  MembershipManagerEvent,
   type LivekitTransportConfig,
   type MatrixRTCSession,
+  MembershipManagerEvent,
 } from "matrix-js-sdk/lib/matrixrtc";
 import { type IWidgetApiRequest } from "matrix-widget-api";
 import { type CallMembershipIdentityParts } from "matrix-js-sdk/lib/matrixrtc/EncryptionManager";
@@ -64,7 +64,14 @@ import {
   showReactions,
 } from "../../settings/settings";
 import { isFirefox, platform } from "../../Platform";
-import { setPipEnabled$ } from "../../controls";
+import {
+  type AudioRoute,
+  currentRoute$,
+  RouteType,
+  setPipEnabled$,
+  showNativeAudioDevicePicker,
+  showNativeAudioDevicePicker$,
+} from "../../controls";
 import { TileStore } from "../TileStore";
 import { gridLikeLayout } from "../GridLikeLayout";
 import { spotlightExpandedLayout } from "../SpotlightExpandedLayout";
@@ -78,7 +85,7 @@ import {
 } from "../../reactions";
 import { shallowEquals } from "../../utils/array";
 import { type MediaDevices } from "../MediaDevices";
-import { constant, type Behavior } from "../Behavior";
+import { type Behavior, constant } from "../Behavior";
 import { E2eeType } from "../../e2ee/e2eeType";
 import { MatrixKeyProvider } from "../../e2ee/matrixKeyProvider";
 import { type MuteStates } from "../MuteStates";
@@ -122,8 +129,8 @@ import {
 import {
   createMatrixLivekitMembers$,
   type LocalMatrixLivekitMember,
-  type RemoteMatrixLivekitMember,
   type MatrixLivekitMember,
+  type RemoteMatrixLivekitMember,
 } from "./remoteMembers/MatrixLivekitMembers.ts";
 import {
   type AutoLeaveReason,
@@ -368,6 +375,14 @@ export interface CallViewModel {
     switch: () => void;
   } | null>;
 
+  /**
+   * Use when in native controlled route mode
+   */
+  nativeAudioRouteSwitcher$: Behavior<{
+    targetOutput: AudioRoute;
+    switch: () => void;
+  } | null>;
+
   /**
    * Whether the app is currently reconnecting to the LiveKit server and/or setting the matrix rtc room state.
    */
@@ -1435,6 +1450,23 @@ export function createCallViewModel$(
     ),
   );
 
+  const nativeAudioRouteSwitcher$ = scope.behavior<{
+    targetOutput: AudioRoute;
+    switch: () => void;
+  } | null>(
+    currentRoute$.pipe(
+      map((route) => {
+        return {
+          targetOutput: route || { type: RouteType.speaker, label: "" },
+          switch: (): void => {
+            showNativeAudioDevicePicker?.();
+          },
+        };
+      }),
+      startWith(null),
+    ),
+  );
+
   /**
    * Emits an array of reactions that should be visible on the screen.
    */
@@ -1624,6 +1656,7 @@ export function createCallViewModel$(
     showFooter$: showFooter$,
     earpieceMode$: earpieceMode$,
     audioOutputSwitcher$: audioOutputSwitcher$,
+    nativeAudioRouteSwitcher$: nativeAudioRouteSwitcher$,
     reconnecting$: localMembership.reconnecting$,
     livekitRoomItems$,
     connected$: localMembership.connected$,

src/state/CallViewModel/localMember/Publisher.ts

@@ -64,7 +64,8 @@ export class Publisher {
     trackerProcessorState$: Behavior<ProcessorState>,
     private logger: Logger,
   ) {
-    const { controlledAudioDevices } = getUrlParams();
+    const { controlledAudioDevices, audioInputOutputSelection } =
+      getUrlParams();
     const room = connection.livekitRoom;
 
     room.setE2EEEnabled(room.options.e2ee !== undefined)?.catch((e: Error) => {
@@ -74,7 +75,12 @@ export class Publisher {
     // Setup track processor syncing (blur)
     this.observeTrackProcessors(this.scope, room, trackerProcessorState$);
     // Observe media device changes and update LiveKit active devices accordingly
-    this.observeMediaDevices(this.scope, devices, controlledAudioDevices);
+    this.observeMediaDevices(
+      this.scope,
+      devices,
+      controlledAudioDevices,
+      audioInputOutputSelection,
+    );
 
     this.workaroundRestartAudioInputTrackChrome(devices, this.scope);
 
@@ -304,7 +310,7 @@ export class Publisher {
           // the process of being restarted.
           activeMicTrack.mediaStreamTrack.readyState !== "ended"
         ) {
-          this.logger?.info(
+          this.logger.info(
             "Restarting audio device track due to active media device changed (workaroundRestartAudioInputTrackChrome)",
           );
           // Restart the track, which will cause Livekit to do another
@@ -326,14 +332,18 @@ export class Publisher {
     scope: ObservableScope,
     devices: MediaDevices,
     controlledAudioDevices: boolean,
+    audioInputOutputSelection: boolean,
   ): void {
     const lkRoom = this.connection.livekitRoom;
     const syncDevice = (
       kind: MediaDeviceKind,
       selected$: Observable<SelectedDevice | undefined>,
-    ): Subscription =>
+    ): Subscription => {
-      selected$.pipe(scope.bind()).subscribe((device) => {
+      return selected$.pipe(scope.bind()).subscribe((device) => {
         if (lkRoom.state != LivekitConnectionState.Connected) return;
+        this.logger.info(
+          `Selection change for kind: ${kind} selected is ${device?.id}`,
+        );
         // if (this.connectionState$.value !== ConnectionState.Connected) return;
         this.logger.info(
           "[LivekitRoom] syncDevice room.getActiveDevice(kind) !== d.id :",
@@ -355,10 +365,15 @@ export class Publisher {
             );
         }
       });
+    };
 
-    syncDevice("audioinput", devices.audioInput.selected$);
+    this.logger.debug(`Syncing initial devices with LiveKit, controlledAudioDevices: ${controlledAudioDevices}, audioInputOutputSelection: ${audioInputOutputSelection}`);
-    if (!controlledAudioDevices)
+    if (audioInputOutputSelection) {
-      syncDevice("audiooutput", devices.audioOutput.selected$);
+      syncDevice("audioinput", devices.audioInput.selected$);
+      if (!controlledAudioDevices) {
+        syncDevice("audiooutput", devices.audioOutput.selected$);
+      }
+    }
     syncDevice("videoinput", devices.videoInput.selected$);
   }
 

src/state/IOSControlledAudioOutput.ts

@@ -50,6 +50,7 @@ export class IOSControlledAudioOutput implements MediaDevice<
     combineLatest(
       [controlledAvailableOutputDevices$.pipe(startWith([])), iosDeviceMenu$],
       (availableRaw, iosDeviceMenu) => {
+        this.logger.debug("Available device update ", availableRaw);
         const available = new Map<string, AudioOutputDeviceLabel>(
           availableRaw.map(
             ({ id, name, isEarpiece, isSpeaker /*,isExternalHeadset*/ }) => {

src/state/IOSNativeControlledAudioOutput.ts

@@ -0,0 +1,57 @@
+/*
+Copyright 2026 Element Corp.
+
+SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE in the repository root for full details.
+*/
+
+import { logger as rootLogger } from "matrix-js-sdk/lib/logger";
+import { map, startWith } from "rxjs";
+
+import { currentRoute$, type Controls } from "../controls.ts";
+import { type Behavior, constant } from "./Behavior.ts";
+import type { ObservableScope } from "./ObservableScope.ts";
+import {
+  type AudioOutputDeviceLabel,
+  type MediaDevice,
+  type SelectedAudioOutputDevice,
+} from "./MediaDevices.ts";
+
+/**
+ * A special implementation of audio output that allows the hosting application
+ * to have more control over the device selection process. This is used when the
+ * `controlledAudioDevices` URL parameter is set, which is currently only true on mobile.
+ */
+export class IOSNativeControlledAudioOutput implements MediaDevice<
+  AudioOutputDeviceLabel,
+  SelectedAudioOutputDevice
+> {
+  private logger = rootLogger.getChild(
+    "[MediaDevices IOSNativeControlledAudioOutput]",
+  );
+
+  public readonly available$: Behavior<Map<string, AudioOutputDeviceLabel>> =
+    constant(new Map());
+
+  public select(id: string): void {
+    this.controls.showNativeAudioDevicePicker?.();
+  }
+
+  public readonly selected$ = this.scope.behavior(
+    currentRoute$.pipe(
+      startWith(null),
+      map((route) => {
+        if (!route) return undefined;
+        this.logger.debug(`Selected ${route?.type}`);
+        return {
+          id: route.type,
+        } as SelectedAudioOutputDevice;
+      }),
+    ),
+  );
+
+  public constructor(
+    private readonly controls: Controls,
+    private readonly scope: ObservableScope,
+  ) {}
+}

src/state/MediaDevices.ts

@@ -30,7 +30,7 @@ import { platform } from "../Platform";
 import { switchWhen } from "../utils/observable";
 import { type Behavior, constant } from "./Behavior";
 import { AndroidControlledAudioOutput } from "./AndroidControlledAudioOutput.ts";
-import { IOSControlledAudioOutput } from "./IOSControlledAudioOutput.ts";
+import { IOSNativeControlledAudioOutput } from "./IOSNativeControlledAudioOutput.ts";
 
 export type DeviceLabel =
   | { type: "name"; name: string }
@@ -376,8 +376,9 @@ export class MediaDevices {
           getUrlParams().callIntent,
           window.controls,
         )
-      : new IOSControlledAudioOutput(this.usingNames$, this.scope)
+      : new IOSNativeControlledAudioOutput(window.controls, this.scope)
-    : new AudioOutput(this.usingNames$, this.scope);
+    : // : new IOSControlledAudioOutput(this.usingNames$, this.scope)
+      new AudioOutput(this.usingNames$, this.scope);
 
   public readonly videoInput: MediaDevice<DeviceLabel, SelectedDevice> =
     new VideoInput(this.usingNames$, this.scope);