fix start restart bugs

src/auracast/multicast.py

@@ -336,10 +336,7 @@ class Streamer():
         self.is_streaming = False
         if self.task is not None:
             self.task.cancel()
-            try:
-                await self.task
-            except asyncio.CancelledError:
-                pass
+
             self.task = None
 
         # Close audio inputs (await to ensure ALSA devices are released)

src/auracast/server/multicast_frontend.py

@@ -51,7 +51,7 @@ if audio_mode in ["Webapp", "USB"]:
     # Input device selection for USB mode
     if audio_mode == "USB":
         try:
-            resp = requests.get(f"{BACKEND_URL}/audio_inputs", timeout=1)
+            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:
@@ -71,6 +71,10 @@ if audio_mode in ["Webapp", "USB"]:
             selected_option = st.selectbox("Input Device", input_options, index=input_options.index(default_input))
         with col2:
             if st.button("Refresh"):
+                try:
+                    requests.post(f"{BACKEND_URL}/refresh_audio_inputs", timeout=3)
+                except Exception as e:
+                    st.error(f"Failed to refresh devices: {e}")
                 st.rerun()
         # We send only the numeric/card identifier (before :) or 'default'
         input_device = selected_option.split(":", 1)[0] if ":" in selected_option else selected_option

src/auracast/server/multicast_server.py

@@ -15,12 +15,13 @@ from aiortc import RTCPeerConnection, RTCSessionDescription, MediaStreamTrack
 import av
 import av.audio.layout
 import sounddevice as sd  # type: ignore
-from typing import Set
+from typing import Set, List, Dict, Any
 import traceback
 
 
 PTIME = 40 # TODO: seems to have no effect at all
 pcs: Set[RTCPeerConnection] = set()      # keep refs so they don’t GC early
+AUDIO_INPUT_DEVICES_CACHE: List[Dict[str, Any]] = []
 
 class Offer(BaseModel):
     sdp: str
@@ -169,6 +170,7 @@ async def stop_audio():
 
         return {"status": "stopped", "was_running": running}
     except Exception as e:
+        log.error("Exception in /stop_audio: %s", traceback.format_exc())
         raise HTTPException(status_code=500, detail=str(e))
 
 
@@ -182,11 +184,12 @@ async def get_status():
     status.update(load_stream_settings())
     return status
 
-@app.get("/audio_inputs")
-async def list_audio_inputs():
-    """Return available hardware audio input devices for USB mode."""
+
+async def scan_audio_devices():
+    """Scans for available audio devices and updates the cache."""
+    global AUDIO_INPUT_DEVICES_CACHE
+    log.info("Scanning for audio input devices...")
     try:
-        # Re-scan devices on Linux, see https://github.com/spatialaudio/python-sounddevice/issues/16
         if sys.platform == 'linux':
             log.info("Re-initializing sounddevice to scan for new devices")
             sd._terminate()
@@ -197,12 +200,30 @@ async def list_audio_inputs():
             for idx, d in enumerate(devs)
             if d.get("max_input_channels", 0) > 0 and ("(hw:" in d["name"].lower() or "usb" in d["name"].lower())
         ]
-        log.info('Found %d audio input devices:', len(inputs))
-        for i in inputs:
-            log.info('  %s', i)
-        return {"inputs": inputs}
-    except Exception as e:
-        raise HTTPException(status_code=500, detail=str(e))
+        log.info('Found %d audio input devices: %s', len(inputs), inputs)
+        AUDIO_INPUT_DEVICES_CACHE = inputs
+    except Exception:
+        log.error("Exception while scanning audio devices:", exc_info=True)
+        # Do not clear cache on error, keep the last known good list
+
+
+@app.on_event("startup")
+async def startup_event():
+    """Pre-scans audio devices on startup."""
+    await scan_audio_devices()
+
+
+@app.get("/audio_inputs")
+async def list_audio_inputs():
+    """Return available hardware audio input devices from cache."""
+    return {"inputs": AUDIO_INPUT_DEVICES_CACHE}
+
+
+@app.post("/refresh_audio_inputs")
+async def refresh_audio_inputs():
+    """Triggers a re-scan of audio devices."""
+    await scan_audio_devices()
+    return {"status": "ok", "inputs": AUDIO_INPUT_DEVICES_CACHE}
 
 
 @app.post("/offer")