force to allow calls without video and audio in embedded mode (#11131)

* force to allow calls without video and audio in embedded mode

* Check device access permission and introduce a only screen share call mode

* Fix strict typ check issue

* Fix i18n check issue

* Add unit tests for device selection

* Fix mocked media device query

src/components/views/voip/CallView.tsx

@@ -32,7 +32,7 @@ import MatrixClientContext from "../../../contexts/MatrixClientContext";
 import AppTile from "../elements/AppTile";
 import { _t } from "../../../languageHandler";
 import { useAsyncMemo } from "../../../hooks/useAsyncMemo";
-import MediaDeviceHandler from "../../../MediaDeviceHandler";
+import MediaDeviceHandler, { IMediaDevices } from "../../../MediaDeviceHandler";
 import { CallStore } from "../../../stores/CallStore";
 import IconizedContextMenu, {
     IconizedContextMenuOption,
@@ -149,14 +149,32 @@ export const Lobby: FC<LobbyProps> = ({ room, joinCallButtonDisabledTooltip, con
         setVideoMuted(!videoMuted);
     }, [videoMuted, setVideoMuted]);
 
+    // In case we can not fetch media devices we should mute the devices
+    const handleMediaDeviceFailing = (message: string): void => {
+        MediaDeviceHandler.startWithAudioMuted = true;
+        MediaDeviceHandler.startWithVideoMuted = true;
+        logger.warn(message);
+    };
+
     const [videoStream, audioInputs, videoInputs] = useAsyncMemo(
         async (): Promise<[MediaStream | null, MediaDeviceInfo[], MediaDeviceInfo[]]> => {
-            let devices = await MediaDeviceHandler.getDevices();
+            let devices: IMediaDevices | undefined;
+            try {
+                devices = await MediaDeviceHandler.getDevices();
+                if (devices === undefined) {
+                    handleMediaDeviceFailing("Could not access devices!");
+                    return [null, [], []];
+                }
+            } catch (error) {
+                handleMediaDeviceFailing(`Unable to get Media Devices: ${error}`);
+                return [null, [], []];
+            }
 
             // We get the preview stream before requesting devices: this is because
             // we need (in some browsers) an active media stream in order to get
             // non-blank labels for the devices.
             let stream: MediaStream | null = null;
+
             try {
                 if (devices!.audioinput.length > 0) {
                     // Holding just an audio stream will be enough to get us all device labels, so
@@ -170,7 +188,8 @@ export const Lobby: FC<LobbyProps> = ({ room, joinCallButtonDisabledTooltip, con
                     stream = await navigator.mediaDevices.getUserMedia({ video: { deviceId: videoInputId } });
                 }
             } catch (e) {
-                logger.error(`Failed to get stream for device ${videoInputId}`, e);
+                logger.warn(`Failed to get stream for device ${videoInputId}`, e);
+                handleMediaDeviceFailing(`Have access to Device list but unable to read from Media Devices`);
             }
 
             // Refresh the devices now that we hold a stream

src/i18n/strings/en_EN.json

@@ -986,6 +986,8 @@
     "Under active development, cannot be disabled.": "Under active development, cannot be disabled.",
     "Element Call video rooms": "Element Call video rooms",
     "New group call experience": "New group call experience",
+    "Under active development.": "Under active development.",
+    "Allow screen share only mode": "Allow screen share only mode",
     "Live Location Sharing": "Live Location Sharing",
     "Temporary implementation. Locations persist in room history.": "Temporary implementation. Locations persist in room history.",
     "Dynamic room predecessors": "Dynamic room predecessors",
@@ -993,7 +995,6 @@
     "Force 15s voice broadcast chunk length": "Force 15s voice broadcast chunk length",
     "Enable new native OIDC flows (Under active development)": "Enable new native OIDC flows (Under active development)",
     "Rust cryptography implementation": "Rust cryptography implementation",
-    "Under active development.": "Under active development.",
     "Font size": "Font size",
     "Use custom size": "Use custom size",
     "Enable Emoji suggestions while typing": "Enable Emoji suggestions while typing",

src/models/Call.ts

@@ -660,6 +660,7 @@ export class ElementCall extends Call {
         });
 
         if (SettingsStore.getValue("fallbackICEServerAllowed")) params.append("allowIceFallback", "");
+        if (SettingsStore.getValue("feature_allow_screen_share_only_mode")) params.append("allowVoipWithNoMedia", "");
 
         // Set custom fonts
         if (SettingsStore.getValue("useSystemFont")) {

src/settings/Settings.tsx

@@ -433,6 +433,15 @@ export const SETTINGS: { [setting: string]: ISetting } = {
         controller: new ReloadOnChangeController(),
         default: false,
     },
+    "feature_allow_screen_share_only_mode": {
+        isFeature: true,
+        supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS_WITH_CONFIG,
+        description: _td("Under active development."),
+        labsGroup: LabGroup.VoiceAndVideo,
+        displayName: _td("Allow screen share only mode"),
+        controller: new ReloadOnChangeController(),
+        default: false,
+    },
     "feature_location_share_live": {
         isFeature: true,
         labsGroup: LabGroup.Messaging,