generate audio minor refactor

app.py

@@ -172,17 +172,20 @@ def generate_audio(prompt: str, duration: int) -> gr.Component:
     Returns:
         gr.Component: The generated audio as a Gradio Audio component.
     """
+    
+    DURATION_LIMIT = 30
+    
     client = Tool.from_space(
         space_id="luke9705/MusicGen_custom",
         token=os.environ.get('HF_TOKEN'),
         name="Sound_Generator",
         description="Generate music or sound effects from a text prompt using MusicGen."
     )
-    if duration > 30:
-        sound = client(prompt, 30)
-    else:
-        sound = client(prompt, duration)
     
+    duration = duration if duration < DURATION_LIMIT else DURATION_LIMIT
+
+    sound = client(prompt, duration)
+
     return gr.Audio(value=sound)
 
 @tool