fix: ToneSandhi IndexError and proper error handling for missing output files

app.py

@@ -189,13 +189,19 @@ async def dynamic_tts(
         out_path = f"/tmp/out_dyn_{int(time.time())}.wav"
         genie_tts.tts(character_name, text, save_path=out_path, play=False, text_language=text_lang, speed=speed)
         
-        # 🟢 同样增加文件等待
+        # 🟢 等待文件生成（最多等5秒）
         wait_time = 0
         while not os.path.exists(out_path) and wait_time < 50:
             time.sleep(0.1)
             wait_time += 1
 
+        # 🔴 修复：检查文件是否实际生成，避免返回不存在的文件
+        if not os.path.exists(out_path):
+            raise HTTPException(status_code=500, detail="TTS processing failed. Output file was not generated.")
+
         return StreamingResponse(open(out_path, "rb"), media_type="audio/wav")
+    except HTTPException:
+        raise
     except Exception as e:
         print(f"❌ Error: {e}")
         raise HTTPException(status_code=500, detail=str(e))

genie_tts/G2P/Chinese/ToneSandhi.py

@@ -301,10 +301,17 @@ class ToneSandhi:
         assert len(sub_finals_list) == len(seg)
         merge_last = [False] * len(seg)
         for i, (word, pos) in enumerate(seg):
+            # 🔴 修复：添加边界检查，防止空字符串导致 IndexError
+            prev_finals = sub_finals_list[i - 1] if i - 1 >= 0 else []
+            curr_finals = sub_finals_list[i]
+            
+            prev_last = prev_finals[-1] if prev_finals and len(prev_finals[-1]) > 0 else ""
+            curr_first = curr_finals[0] if curr_finals and len(curr_finals[0]) > 0 else ""
+            
             if (
                     i - 1 >= 0
-                    and sub_finals_list[i - 1][-1][-1] == "3"
-                    and sub_finals_list[i][0][-1] == "3"
+                    and len(prev_last) > 0 and prev_last[-1] == "3"
+                    and len(curr_first) > 0 and curr_first[-1] == "3"
                     and not merge_last[i - 1]
             ):
                 # if the last word is reduplication, not merge, because reduplication need to be _neural_sandhi