Automatically update camera image when detecting objects and show activity indicators

web/src/api/ws.tsx

@@ -194,3 +194,24 @@ export function useRestart() {
   } = useWs("restart", "restart");
   return { payload, send };
 }
+
+export function useFrigateEvents() {
+  const {
+    value: { payload },
+  } = useWs(`events`, "");
+  return { payload };
+}
+
+export function useMotionActivity(camera: string) {
+  const {
+    value: { payload },
+  } = useWs(`${camera}/motion`, "");
+  return { payload };
+}
+
+export function useAudioActivity(camera: string) {
+  const {
+    value: { payload },
+  } = useWs(`${camera}/audio/rms`, "");
+  return { payload };
+}

web/src/components/camera/DynamicCameraImage.tsx

@@ -0,0 +1,109 @@
+import { useCallback, useEffect, useState } from "react";
+import { AspectRatio } from "../ui/aspect-ratio";
+import CameraImage from "./CameraImage";
+import { LuEar } from "react-icons/lu";
+import { CameraConfig } from "@/types/frigateConfig";
+import { TbUserScan } from "react-icons/tb";
+import { MdLeakAdd } from "react-icons/md";
+import { useFrigateEvents, useMotionActivity } from "@/api/ws";
+import { FrigateEvent } from "@/types/ws";
+
+type DynamicCameraImageProps = {
+  camera: CameraConfig;
+  aspect: number;
+};
+
+const INTERVAL_INACTIVE_MS = 60000; // refresh once a minute
+const INTERVAL_ACTIVE_MS = 1000; // refresh once a second
+
+export default function DynamicCameraImage({
+  camera,
+  aspect,
+}: DynamicCameraImageProps) {
+  const [key, setKey] = useState(Date.now());
+  const [activeObjects, setActiveObjects] = useState<string[]>([]);
+
+  const { payload: detectingMotion } = useMotionActivity(camera.name);
+  const { payload: event } = useFrigateEvents();
+  const { payload: audioRms } = useMotionActivity(camera.name);
+
+  useEffect(() => {
+    if (!event) {
+      return;
+    }
+
+    const frigateEvent = event as unknown as FrigateEvent;
+
+    if (frigateEvent.after.camera != camera.name) {
+      return;
+    }
+
+    if (frigateEvent.type == "end") {
+      const eventIndex = activeObjects.indexOf(frigateEvent.after.id);
+
+      if (eventIndex != -1) {
+        const newActiveObjects = [...activeObjects];
+        newActiveObjects.splice(eventIndex, 1);
+        setActiveObjects(newActiveObjects);
+      }
+    } else {
+      if (!frigateEvent.after.stationary) {
+        const eventIndex = activeObjects.indexOf(frigateEvent.after.id);
+
+        if (eventIndex == -1) {
+          const newActiveObjects = [...activeObjects, frigateEvent.after.id];
+          setActiveObjects(newActiveObjects);
+          setKey(Date.now());
+        }
+      }
+    }
+  }, [event, activeObjects]);
+
+  const handleLoad = useCallback(() => {
+    const loadTime = Date.now() - key;
+    const loadInterval =
+      activeObjects.length > 0 ? INTERVAL_ACTIVE_MS : INTERVAL_INACTIVE_MS;
+
+    setTimeout(
+      () => {
+        setKey(Date.now());
+      },
+      loadTime > loadInterval ? 1 : loadInterval
+    );
+  }, [activeObjects, key]);
+
+  return (
+    <AspectRatio
+      ratio={aspect}
+      className="bg-black flex justify-center items-center relative"
+    >
+      <CameraImage
+        camera={camera.name}
+        fitAspect={aspect}
+        searchParams={`cache=${key}`}
+        onload={handleLoad}
+      />
+      <div className="flex absolute right-0 bottom-0 bg-black bg-opacity-20 rounded p-1">
+        <MdLeakAdd
+          className={`${
+            detectingMotion == "ON" ? "text-red-500" : "text-gray-600"
+          }`}
+        />
+        <TbUserScan
+          className={`${
+            activeObjects.length > 0 ? "text-cyan-500" : "text-gray-600"
+          }`}
+        />
+        {camera.audio.enabled && (
+          <LuEar
+            className={`${
+              parseInt(audioRms) >= camera.audio.min_volume
+                ? "text-orange-500"
+                : "text-gray-600"
+            }`}
+          />
+        )}
+      </div>
+    </AspectRatio>
+  );
+}

web/src/pages/Dashboard.tsx

@@ -20,6 +20,7 @@ import { TbMovie } from "react-icons/tb";
 import MiniEventCard from "@/components/card/MiniEventCard";
 import { Event as FrigateEvent } from "@/types/event";
 import { ScrollArea, ScrollBar } from "@/components/ui/scroll-area";
+import DynamicCameraImage from "@/components/camera/DynamicCameraImage";
 
 export function Dashboard() {
   const { data: config } = useSWR<FrigateConfig>("config");
@@ -96,12 +97,7 @@ function Camera({ camera }: { camera: CameraConfig }) {
     <>
       <Card>
         <a href={`/live/${camera.name}`}>
-          <AspectRatio
-            ratio={16 / 9}
-            className="bg-black flex justify-center items-center"
-          >
-            <CameraImage camera={camera.name} fitAspect={16 / 9} />
-          </AspectRatio>
+          <DynamicCameraImage aspect={16 / 9} camera={camera} />
           <div className="flex justify-between items-center">
             <div className="text-lg capitalize p-2">
               {camera.name.replaceAll("_", " ")}

web/src/types/ws.ts

@@ -0,0 +1,34 @@
+type FrigateObjectState = {
+  id: string;
+  camera: string;
+  frame_time: number;
+  snapshot_time: number;
+  label: string;
+  sub_label: string | null;
+  top_score: number;
+  false_positive: boolean;
+  start_time: number;
+  end_time: number | null;
+  score: number;
+  box: [number, number, number, number];
+  area: number;
+  ratio: number;
+  region: [number, number, number, number];
+  current_zones: string[];
+  entered_zones: string[];
+  thumbnail: string | null;
+  has_snapshot: boolean;
+  has_clip: boolean;
+  stationary: boolean;
+  motionless_count: number;
+  position_changes: number;
+  attributes: {
+    [key: string]: number;
+  };
+};
+
+export interface FrigateEvent {
+  type: "new" | "update" | "end";
+  before: FrigateObjectState;
+  after: FrigateObjectState;
+}