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

apps/api/src/routes/tools/silence-removal.ts

@@ -0,0 +1,38 @@
+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 settingsSchema = z.object({
+  thresholdDb: z.number().min(-80).max(-20).default(-50),
+  minSilenceS: z.number().min(0.1).max(5).default(0.5),
+});
+
+export function registerSilenceRemoval(app: FastifyInstance) {
+  createToolRoute(app, {
+    toolId: "silence-removal",
+    settingsSchema,
+    process: async () => {
+      throw new Error("silence-removal 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}_nosilence${out.ext}`;
+
+      const t = settings.thresholdDb;
+      const d = settings.minSilenceS;
+      const chain =
+        `silenceremove=start_periods=1:start_threshold=${t}dB:start_silence=0.1` +
+        `:stop_periods=-1:stop_threshold=${t}dB:stop_duration=${d}`;
+
+      const { outPath } = await runMediaTool(ctx, outName, (inPath, outPath) => {
+        return ["-i", inPath, "-af", chain, ...out.encodeArgs, outPath];
+      });
+      return { scratchPath: outPath, filename: outName, contentType: out.contentType };
+    },
+  });
+}