add config option for room camera interval

server/src/services/roomCameraService/configuration.js

@@ -1,7 +1,7 @@
 // Room-Camera Configuration
 // Purpose: Defines the optional named snapshot and stream camera catalog.
 // Scope: Contains configuration metadata only and never contacts a camera.
-const { strictObject, string, boolean } = require('../../configuration/schemaHelpers');
+const { strictObject, string, boolean, integer } = require('../../configuration/schemaHelpers');
 
 module.exports = {
   key: 'roomCameras',
@@ -10,6 +10,7 @@ module.exports = {
   // initial configuration while the feature switch prevents network requests.
   defaultValue: {
     enabled: false,
+    streamIntervalMs: 2000,
     cameras: [
       {
         id: 'lobby',
@@ -29,6 +30,7 @@ module.exports = {
   },
   schema: strictObject({
     enabled: boolean({ description: 'Immediately publishes the configured room-camera catalog and enables camera snapshots and streams.' }),
+    streamIntervalMs: integer({ title: 'Stream interval (ms)', description: 'Interval for sending room camera images to clients. Lowering this increases bandwidth usage FAST because it sends a full image each time.', minimum: 1 }),
     cameras: {
       type: 'array',
       description: 'Room cameras available to the web UI and replay system.',

server/src/services/roomCameraService/index.js

@@ -8,10 +8,12 @@ const replay = require('../replayEngineV2/roomCameraReplayBuilder');
 const { loadConfig, registerConfigurationHandler } = require('../../configuration');
 
 let enabled = false;
+let streamIntervalMs = 2000;
 
 const snapshotEngine = createSnapshotEngine({ getRoomCameras, roomCameraEvents });
 function applyRoomCameraConfig(roomCameraConfig = {}) {
   enabled = Boolean(roomCameraConfig.enabled);
+  streamIntervalMs = roomCameraConfig.streamIntervalMs ?? 2000;
   // Loading an empty catalog on disable causes the snapshot engine's existing
   // update listener to close every stream and timer without unregistering the
   // stable browser gateway.
@@ -19,6 +21,7 @@ function applyRoomCameraConfig(roomCameraConfig = {}) {
 }
 
 registerRoomCameraSocketGateway({
+  getStreamIntervalMs: () => streamIntervalMs,
   getRoomCamera,
   getRoomCameras,
   getRoomCameraState: snapshotEngine.getRoomCameraState,

server/src/services/roomCameraService/socketGateway.js

@@ -8,7 +8,6 @@ const { isAdmin, isLockdownAdmin, getRole } = require('../roleService');
 
 const SUBSCRIBE_LIMIT = 50;
 const SUBSCRIBE_WINDOW_MS = 10000;
-const STREAM_INTERVAL_MS = 2000;
 
 function passesMode(socket) {
   const mode = getMode();
@@ -20,7 +19,7 @@ function passesMode(socket) {
   return true;
 }
 
-function registerRoomCameraSocketGateway({ getRoomCamera, getRoomCameras, getRoomCameraState, roomCameraStreamEvents }) {
+function registerRoomCameraSocketGateway({ getRoomCamera, getRoomCameras, getRoomCameraState, roomCameraStreamEvents, getStreamIntervalMs }) {
   const cameraSubscribers = new Map();
   const socketSubscriptions = new Map();
   const subscribeBuckets = new Map();
@@ -82,7 +81,7 @@ function registerRoomCameraSocketGateway({ getRoomCamera, getRoomCameras, getRoo
       }
       const lastSent = lastMap.get(id) || 0;
       const now = ts || Date.now();
-      if (now - lastSent < STREAM_INTERVAL_MS) return;
+      if (now - lastSent < getStreamIntervalMs()) return;
       lastMap.set(id, now);
       sendFrame(socket, id, { ts }, buffer);
     });