implement basic support for auracast over the network

src/auracast/server/multicast_frontend.py

@@ -37,7 +37,7 @@ except Exception:
 st.title("🎙️ Auracast Audio Mode Control")
 
 # Audio mode selection with persisted default
-options = ["Webapp", "USB", "Demo"]
+options = ["Webapp", "USB/Network", "Demo"]
 saved_audio_mode = saved_settings.get("audio_mode", "Webapp")
 if saved_audio_mode not in options:
     saved_audio_mode = "Webapp"
@@ -46,7 +46,7 @@ audio_mode = st.selectbox(
     "Audio Mode",
     options,
     index=options.index(saved_audio_mode),
-    help="Select the audio input source. Choose 'Webapp' for browser microphone, 'USB' for a connected hardware device, or 'Demo' for a simulated stream."
+    help="Select the audio input source. Choose 'Webapp' for browser microphone, 'USB/Network' for a connected hardware device, or 'Demo' for a simulated stream."
 )
 
 if audio_mode == "Demo":
@@ -201,15 +201,9 @@ else:
         mic_gain = 1.0
 
     # Input device selection for USB mode
-    if audio_mode == "USB":
-        try:
-            resp = requests.get(f"{BACKEND_URL}/audio_inputs")
-            if resp.status_code == 200:
-                input_options = [f"{d['id']}:{d['name']}" for d in resp.json().get('inputs', [])]
-            else:
-                input_options = []
-        except Exception:
-            input_options = []
+    if audio_mode == "USB/Network":
+        resp = requests.get(f"{BACKEND_URL}/audio_inputs")
+        input_options = [f"{d['id']}:{d['name']}" for d in resp.json().get('inputs', [])]
 
         if not input_options:
             st.warning("No hardware audio input devices found. Plug in a USB input device and click Refresh.")
@@ -295,11 +289,11 @@ else:
                     program_info=program_info,
                     language=language,
                     audio_source=(
-                        f"device:{input_device}" if audio_mode == "USB" else (
+                        f"device:{input_device}" if audio_mode == "USB/Network" else (
                             "webrtc" if audio_mode == "Webapp" else "network"
                         )
                     ),
-                    input_format=(f"int16le,{q['rate']},1" if audio_mode == "USB" else "auto"),
+                    input_format=(f"int16le,{q['rate']},1" if audio_mode == "USB/Network" else "auto"),
                     iso_que_len=1, # TODO: this should be way less to decrease delay
                     sampling_frequency=q['rate'],
                     octets_per_frame=q['octets'],