remove gr.JSON

app.py

@@ -71,13 +71,24 @@ def generate_dummy_metadata(stem_choice: str, username: str) -> Dict:
         "labels": [vars(label) for label in label_list.labels]
     }
 
-def process_fn_stem(audio_file_path, demucs_model, stem_choice) -> dict:
-    return {
-        "hello": "world",
-        "number": 123,
-        "text" : "yes"
+import json
+
+def process_fn_stem(audio_file_path, demucs_model, stem_choice, profile=None):
+    username = profile.username if profile else "anonymous"
+
+    stem_signal = separate_stem(audio_file_path, model_name=demucs_model, stem_choice=stem_choice)
+    stem_filename = f"{stem_choice.lower().replace(' ', '_')}.wav"
+    stem_path = save_audio(stem_signal, stem_filename)
+
+    metadata = {
+        "user": username,
+        "stem": stem_choice,
+        "amplitude": 0.7,
+        "description": f"Start of {stem_choice}"
     }
 
+    return stem_path, json.dumps(metadata, indent=2)
+