Use laptop MP3 TTS playback

tools/tts-server.mjs

@@ -0,0 +1,96 @@
+import crypto from 'node:crypto';
+import fs from 'node:fs';
+import path from 'node:path';
+import cors from 'cors';
+import express from 'express';
+import { MsEdgeTTS, OUTPUT_FORMAT } from 'msedge-tts';
+
+const app = express();
+const port = Number(process.env.TTS_PORT ?? 3333);
+const host = process.env.TTS_HOST ?? '0.0.0.0';
+const cacheDir = path.resolve(process.cwd(), '.tts-cache');
+
+fs.mkdirSync(cacheDir, { recursive: true });
+
+app.use(cors());
+app.use(express.json({ limit: '64kb' }));
+app.use('/audio', express.static(cacheDir, { maxAge: '1h' }));
+
+app.get('/health', (_request, response) => {
+  response.json({ ok: true, voice: getVoiceFromEnv() });
+});
+
+app.get('/voices', async (_request, response) => {
+  const tts = new MsEdgeTTS({});
+  const voices = await tts.getVoices();
+  response.json(
+    voices
+      .filter((voice) => voice.Locale.startsWith('en-'))
+      .map((voice) => ({
+        name: voice.ShortName,
+        friendlyName: voice.FriendlyName,
+        gender: voice.Gender,
+        locale: voice.Locale,
+      })),
+  );
+});
+
+app.post('/tts', async (request, response) => {
+  const text = sanitizeText(String(request.body?.text ?? ''));
+
+  if (!text) {
+    response.status(400).json({ error: 'Missing text' });
+    return;
+  }
+
+  const voice = String(request.body?.voice ?? getVoiceFromEnv());
+  const rate = String(request.body?.rate ?? process.env.TTS_RATE ?? '-8%');
+  const pitch = String(request.body?.pitch ?? process.env.TTS_PITCH ?? '+0Hz');
+  const hash = crypto.createHash('sha256').update(`${voice}|${rate}|${pitch}|${text}`).digest('hex');
+  const filename = `${hash}.mp3`;
+  const filePath = path.join(cacheDir, filename);
+
+  if (!fs.existsSync(filePath)) {
+    const tts = new MsEdgeTTS({});
+    await tts.setMetadata(voice, OUTPUT_FORMAT.AUDIO_24KHZ_96KBITRATE_MONO_MP3);
+    const { audioFilePath, metadataFilePath } = await tts.toFile(cacheDir, escapeXml(text), { rate, pitch });
+    fs.renameSync(audioFilePath, filePath);
+    if (metadataFilePath && fs.existsSync(metadataFilePath)) {
+      fs.unlinkSync(metadataFilePath);
+    }
+    tts.close();
+  }
+
+  response.json({ audioUrl: `${request.protocol}://${request.get('host')}/audio/${filename}` });
+});
+
+app.listen(port, host, () => {
+  console.log(`TTS server listening on http://${host}:${port}`);
+  console.log(`Voice: ${getVoiceFromEnv()}`);
+});
+
+function getVoiceFromEnv() {
+  return process.env.TTS_VOICE ?? 'en-US-JennyNeural';
+}
+
+function sanitizeText(value) {
+  return value
+    .replace(/<think>[\s\S]*?<\/think>/gi, '')
+    .replace(/```[\s\S]*?```/g, ' ')
+    .replace(/`([^`]+)`/g, '$1')
+    .replace(/\*\*([^*]+)\*\*/g, '$1')
+    .replace(/[*_#>~]/g, '')
+    .replace(/https?:\/\/\S+/g, '')
+    .replace(/\s+/g, ' ')
+    .trim()
+    .slice(0, 1800);
+}
+
+function escapeXml(value) {
+  return value
+    .replace(/&/g, '&amp;')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;')
+    .replace(/"/g, '&quot;')
+    .replace(/'/g, '&apos;');
+}