use custom swr fetcher to check for audio support

The go2rtc API doesn't always return stream data for anything not being actively consumed, so audio support was not always being correctly deduced. So we can use a custom swr fetcher to call the endpoint that probes the streams, which returns the correct producers data.

web/src/hooks/use-camera-live-mode.ts

@@ -1,5 +1,5 @@
 import { CameraConfig, FrigateConfig } from "@/types/frigateConfig";
-import { useCallback, useEffect, useState } from "react";
+import { useCallback, useEffect, useState, useMemo } from "react";
 import useSWR from "swr";
 import { LivePlayerMode, LiveStreamMetadata } from "@/types/live";
 
@@ -8,9 +8,54 @@ export default function useCameraLiveMode(
   windowVisible: boolean,
 ) {
   const { data: config } = useSWR<FrigateConfig>("config");
-  const { data: allStreamMetadata } = useSWR<{
+
+  // Get comma-separated list of restreamed stream names for SWR key
+  const restreamedStreamsKey = useMemo(() => {
+    if (!cameras || !config) return null;
+
+    const streamNames = new Set<string>();
+    cameras.forEach((camera) => {
+      const isRestreamed = Object.keys(config.go2rtc.streams || {}).includes(
+        Object.values(camera.live.streams)[0],
+      );
+
+      if (isRestreamed) {
+        Object.values(camera.live.streams).forEach((streamName) => {
+          streamNames.add(streamName);
+        });
+      }
+    });
+
+    return streamNames.size > 0
+      ? Array.from(streamNames).sort().join(",")
+      : null;
+  }, [cameras, config]);
+
+  const streamsFetcher = useCallback(async (key: string) => {
+    const streamNames = key.split(",");
+    const metadata: { [key: string]: LiveStreamMetadata } = {};
+
+    await Promise.all(
+      streamNames.map(async (streamName) => {
+        try {
+          const response = await fetch(`/api/go2rtc/streams/${streamName}`);
+          if (response.ok) {
+            const data = await response.json();
+            metadata[streamName] = data;
+          }
+        } catch (error) {
+          // eslint-disable-next-line no-console
+          console.error(`Failed to fetch metadata for ${streamName}:`, error);
+        }
+      }),
+    );
+
+    return metadata;
+  }, []);
+
+  const { data: allStreamMetadata = {} } = useSWR<{
     [key: string]: LiveStreamMetadata;
-  }>(config ? "go2rtc/streams" : null, { revalidateOnFocus: false });
+  }>(restreamedStreamsKey, streamsFetcher, { revalidateOnFocus: false });
 
   const [preferredLiveModes, setPreferredLiveModes] = useState<{
     [key: string]: LivePlayerMode;