restrict to .wav format, working on mp3 support next

app.py

@@ -3,7 +3,10 @@ import langcodes
 from allosaurus.app import read_recognizer
 
   
-
+def get_bytes_in_wav_format(uploaded_file):
+  if ".wav" in uploaded_file:
+    return uploaded_file.getvalue()
+  # TODO: .mp3 conversion      
 
 
 def get_langcode_for_allosaurus(input_code):
@@ -28,9 +31,16 @@ if __name__ == "__main__":
   
   model = read_recognizer()
   
-  uploaded_file = st.file_uploader("Choose a file")
+  uploaded_file = st.file_uploader("Choose a file", type=[
+                                                          ".wav", 
+#                                                          ".mp3",
+                                                          ])
+  
+  
   if uploaded_file is not None:
-    audio_bytes = uploaded_file.getvalue()
+    audio_bytes = get_bytes_in_wav_format()
+    
+    
 #    audio_bytes = audio_file.read()
     st.audio(audio_bytes, format='audio/wav')