stereo seems to work, NEEDS RADIO FIRMWARE WITH 2 TX BUFFERS.

src/auracast/multicast.py

@@ -253,6 +253,12 @@ class PyAlsaAudioInput(audio_io.ThreadedAudioInput):
                 self._resampler_buffer,
                 np.zeros(frame_size * self._actual_channels, dtype=np.float32),
             ])
+        except Exception as e:
+            logging.error("PyALSA: Unexpected error in _read: %s", e, exc_info=True)
+            self._resampler_buffer = np.concatenate([
+                self._resampler_buffer,
+                np.zeros(frame_size * self._actual_channels, dtype=np.float32),
+            ])
 
         needed = frame_size * self._actual_channels
         if len(self._resampler_buffer) < needed:

src/auracast/server/multicast_server.py

@@ -391,7 +391,7 @@ async def init_radio(transport: str, conf: auracast_config.AuracastConfigGroup,
                     if is_stereo and sel == 'ch1':
                         # Stereo mode: use ALSA directly to capture both channels from hardware
                         # ch1=left (channel 0), ch2=right (channel 1)
-                        big.audio_source = 'alsa:hw:CARD=i2s,DEV=0'
+                        big.audio_source = 'device:hw:2'
                         big.input_format = f"int16le,{hardware_capture_rate},2"
                         log.info("Configured analog stereo input: using ALSA hw:CARD=i2s,DEV=0 with ch1=left, ch2=right")
                     elif is_stereo and sel == 'ch2':