chore: rename service folders to lowercase

frontend/server/api/pilot-transcribe.post.ts

@@ -0,0 +1,62 @@
+import { readBody } from "h3";
+import { getAuthContext } from "../utils/auth";
+import { transcribeWithWhisper } from "../utils/whisper";
+
+type TranscribeBody = {
+  audioBase64?: string;
+  sampleRate?: number;
+  language?: string;
+};
+
+function decodeBase64Pcm16(audioBase64: string) {
+  const pcmBuffer = Buffer.from(audioBase64, "base64");
+  if (pcmBuffer.length < 2) return new Float32Array();
+
+  const sampleCount = Math.floor(pcmBuffer.length / 2);
+  const out = new Float32Array(sampleCount);
+
+  for (let i = 0; i < sampleCount; i += 1) {
+    const lo = pcmBuffer[i * 2]!;
+    const hi = pcmBuffer[i * 2 + 1]!;
+    const int16 = (hi << 8) | lo;
+    const signed = int16 >= 0x8000 ? int16 - 0x10000 : int16;
+    out[i] = signed / 32768;
+  }
+
+  return out;
+}
+
+export default defineEventHandler(async (event) => {
+  await getAuthContext(event);
+
+  const body = await readBody<TranscribeBody>(event);
+  const audioBase64 = String(body?.audioBase64 ?? "").trim();
+  const sampleRateRaw = Number(body?.sampleRate ?? 0);
+  const language = String(body?.language ?? "").trim() || undefined;
+
+  if (!audioBase64) {
+    throw createError({ statusCode: 400, statusMessage: "audioBase64 is required" });
+  }
+
+  if (!Number.isFinite(sampleRateRaw) || sampleRateRaw < 8000 || sampleRateRaw > 48000) {
+    throw createError({ statusCode: 400, statusMessage: "sampleRate must be between 8000 and 48000" });
+  }
+
+  const samples = decodeBase64Pcm16(audioBase64);
+  if (!samples.length) {
+    throw createError({ statusCode: 400, statusMessage: "Audio is empty" });
+  }
+
+  const maxSamples = Math.floor(sampleRateRaw * 120);
+  if (samples.length > maxSamples) {
+    throw createError({ statusCode: 413, statusMessage: "Audio is too long (max 120s)" });
+  }
+
+  const text = await transcribeWithWhisper({
+    samples,
+    sampleRate: sampleRateRaw,
+    language,
+  });
+
+  return { text };
+});