use gradio tmp as mp3 cache dir

app.py

@@ -1,6 +1,7 @@
 import os
 import re
 import json
+import uuid
 import torch
 import shutil
 import requests
@@ -99,10 +100,8 @@ def music163_song_info(id: str):
 def url_infer(song: str, cache_dir="./__pycache__/mode2"):
     song_name = ""
     clean_cache(cache_dir)
-    audio_path = "./__pycache__/output.mp3"
-    if os.path.exists(audio_path):
-        os.remove(audio_path)
-
+    audio_path = f"/tmp/gradio/{uuid.uuid4().hex}/"
+    os.makedirs(audio_path, exist_ok=True)
     try:
         if (is_url(song) and "163" in song and "?id=" in song) or song.isdigit():
             song_id = get_1st_int(song.split("?id=")[-1])
@@ -111,6 +110,7 @@ def url_infer(song: str, cache_dir="./__pycache__/mode2"):
             if not free:
                 raise AttributeError("Unable to parse VIP songs")
 
+            audio_path += f"{song_id}.mp3"
             download_audio(song_url, audio_path)
 
         midi, title = audio2midi(audio_path, cache_dir)