feat(tools): 2.0 phase 5 wave 3b - audio depth (14 tools) (#222)

apps/api/src/routes/tools/noise-reduction.ts

@@ -0,0 +1,40 @@
+import { extname } from "node:path";
+import type { FastifyInstance } from "fastify";
+import { z } from "zod";
+import { audioOutputFor, runMediaTool } from "../../lib/media-tool.js";
+import { createToolRoute } from "../tool-factory.js";
+
+const NR_MAP: Record<string, number> = {
+  light: 6,
+  medium: 12,
+  strong: 24,
+};
+
+const settingsSchema = z.object({
+  strength: z.enum(["light", "medium", "strong"]).default("medium"),
+});
+
+export function registerNoiseReduction(app: FastifyInstance) {
+  createToolRoute(app, {
+    toolId: "noise-reduction",
+    settingsSchema,
+    process: async () => {
+      throw new Error("noise-reduction is v2-only");
+    },
+    processV2: async (ctx) => {
+      const settings = settingsSchema.parse(ctx.settings);
+      const origExt = extname(ctx.inputs[0].filename) || ".mp3";
+      const out = audioOutputFor(origExt);
+      const base = ctx.inputs[0].filename.replace(/\.[^.]+$/, "");
+      const outName = `${base}_denoised${out.ext}`;
+
+      const nr = NR_MAP[settings.strength];
+      const chain = `afftdn=nr=${nr}:nf=-50`;
+
+      const { outPath } = await runMediaTool(ctx, outName, (inPath, outPath) => {
+        return ["-i", inPath, "-af", chain, ...out.encodeArgs, outPath];
+      });
+      return { scratchPath: outPath, filename: outName, contentType: out.contentType };
+    },
+  });
+}