feat: add real-time TTS endpoint POST /api/tts

app/main.py

@@ -219,6 +219,71 @@ async def get_chapter_audio(book_id: str, chapter_id: str):
     return FileResponse(chapter.audio_file, media_type="audio/mpeg", filename=f"{chapter_id}.mp3")
 
 
+# ── 实时 TTS 接口（兼容百度/阿里云风格）──────────────────────────────────
+
+from fastapi.responses import Response
+
+@app.post("/api/tts")
+async def realtime_tts(request: Request):
+    """
+    实时 TTS 生成接口
+    请求体 (JSON):
+      - text: 要合成的文本（必填）
+      - style: 风格（可选，如"开心"、"东北话"）
+      - speed: 语速调整（可选，暂未使用，MiMo 通过 style 控制语速）
+    返回: MP3 音频二进制流 (audio/mpeg)
+    """
+    data = await request.json()
+    text = data.get("text", "").strip()
+    style = data.get("style", "").strip()
+
+    if not text:
+        return Response(
+            content=json.dumps({"status": 40000001, "message": "text 不能为空"}, ensure_ascii=False),
+            media_type="application/json",
+            status_code=400,
+        )
+
+    try:
+        # MiMo TTS 生成 WAV
+        wav_bytes = await call_mimo_tts(text, style)
+
+        # WAV → MP3（内存中完成）
+        tmp_dir = Path(config.AUDIO_DIR) / "_tmp"
+        tmp_dir.mkdir(parents=True, exist_ok=True)
+        tmp_id = uuid.uuid4().hex
+        wav_path = str(tmp_dir / f"{tmp_id}.wav")
+        mp3_path = str(tmp_dir / f"{tmp_id}.mp3")
+
+        with open(wav_path, "wb") as f:
+            f.write(wav_bytes)
+
+        loop = asyncio.get_event_loop()
+        await loop.run_in_executor(None, wav_to_mp3, wav_path, mp3_path)
+
+        with open(mp3_path, "rb") as f:
+            mp3_bytes = f.read()
+
+        # 清理临时文件
+        os.remove(wav_path)
+        os.remove(mp3_path)
+
+        return Response(content=mp3_bytes, media_type="audio/mpeg")
+
+    except HTTPException:
+        return Response(
+            content=json.dumps({"status": 50000001, "message": "TTS 生成失败"}, ensure_ascii=False),
+            media_type="application/json",
+            status_code=502,
+        )
+    except Exception as e:
+        return Response(
+            content=json.dumps({"status": 50000002, "message": str(e)[:300]}, ensure_ascii=False),
+            media_type="application/json",
+            status_code=500,
+        )
+
+
 # ── 管理 API ──────────────────────────────────────────────────────────────
 
 # --- Books ---