implement noise reduction based on DeepFilterNet3

src/livekit/useNoiseSuppressionTransformer.ts

@@ -0,0 +1,57 @@
+/*
+Copyright 2024 New Vector Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE in the repository root for full details.
+*/
+
+import { useEffect, useRef } from "react";
+
+import { noiseSuppressionEnabled, noiseSuppressionLevel } from "../settings/settings";
+import { useBehavior } from "../useBehavior";
+import { NoiseSuppressionTransformer } from "../livekit/NoiseSuppressionTransformer";
+
+/**
+ * Hook to manage the NoiseSuppressionTransformer instance.
+ * Synchronizes the transformer with the noise suppression settings.
+ * Returns the transformer instance for use in Publishers.
+ */
+export const useNoiseSuppressionTransformer = (): NoiseSuppressionTransformer => {
+  const transformerRef = useRef<NoiseSuppressionTransformer | null>(null);
+  const enabledValue = useBehavior(noiseSuppressionEnabled.value$);
+  const levelValue = useBehavior(noiseSuppressionLevel.value$);
+
+  // Initialize transformer on first mount
+  useEffect(() => {
+    if (!transformerRef.current) {
+      transformerRef.current = new NoiseSuppressionTransformer();
+      // Initialize with current settings
+      void transformerRef.current.initialize(levelValue, enabledValue);
+    }
+  }, []);
+
+  // Sync enabled state when setting changes
+  useEffect(() => {
+    if (transformerRef.current) {
+      transformerRef.current.setEnabled(enabledValue);
+    }
+  }, [enabledValue]);
+
+  // Sync level when setting changes
+  useEffect(() => {
+    if (transformerRef.current) {
+      transformerRef.current.setSuppressionLevel(levelValue);
+    }
+  }, [levelValue]);
+
+  // Cleanup on unmount
+  useEffect(() => {
+    return () => {
+      if (transformerRef.current) {
+        transformerRef.current.destroy();
+      }
+    };
+  }, []);
+
+  return transformerRef.current!;
+};