First working version of two monos at the same time.

src/auracast/multicast.py

@@ -145,6 +145,7 @@ class PyAlsaAudioInput(audio_io.ThreadedAudioInput):
 
     def __init__(self, device, pcm_format: audio_io.PcmFormat):
         super().__init__()
+        logging.info("PyALSA: device = %s", device)
         self._device = str(device) if not isinstance(device, str) else device
         if self._device.isdigit():
             self._device = 'default' if self._device == '0' else f'hw:{self._device}'
@@ -221,7 +222,7 @@ class PyAlsaAudioInput(audio_io.ThreadedAudioInput):
                     expected_mono = self._periodsize * 2
                     expected_stereo = self._periodsize * 2 * 2
                     # self._hw_channels = 2 if len(data) == expected_stereo else 1
-                    self._hw_channels = 2  # TODO fix stereo detection, on first read might detect 0 data
+                    self._hw_channels = self._actual_channels
                     logging.info("PyALSA first read: bytes=%d detected_hw_channels=%d requested_channels=%d", 
                                 len(data), self._hw_channels, self._actual_channels)
                     self._first_read = False

src/auracast/server/multicast_server.py

@@ -398,11 +398,8 @@ async def init_radio(transport: str, conf: auracast_config.AuracastConfigGroup,
                         # Skip ch2 in stereo mode as it's already captured as part of stereo pair
                         continue
                     else:
-                        # Mono mode: individual channel capture
-                        device_index = resolve_input_device_index(sel)
-                        if device_index is None:
-                            raise HTTPException(status_code=400, detail=f"Audio device '{sel}' not found.")
-                        big.audio_source = f'device:{device_index}'
+                        # Mono mode: use dsnoop virtual device directly (ch1=left, ch2=right)
+                        big.audio_source = f'device:{sel}'
                         big.input_format = f"int16le,{hardware_capture_rate},1"
                     continue
 
@@ -944,7 +941,7 @@ async def _startup_autostart_event():
     log.info("[STARTUP] Auracast multicast server startup: initializing settings cache, I2C, and PipeWire cache")
     
     # Run install_asoundconf.sh script
-    script_path = os.path.join(os.path.dirname(__file__), '..', 'misc', 'install_asoundconf.sh')
+    script_path = os.path.join(os.path.dirname(__file__), '..', '..', 'misc', 'install_asoundconf.sh')
     try:
         log.info("[STARTUP] Running install_asoundconf.sh script")
         result = subprocess.run(['bash', script_path], capture_output=True, text=True, check=True)

src/misc/asound.conf

@@ -6,8 +6,8 @@ pcm.ch1 {
         channels 2
         rate 48000
         format S16_LE
-        period_size 120    
-        buffer_size 240    
+        period_size 240    
+        buffer_size 960    
     }
     bindings.0  0
 }
@@ -21,8 +21,8 @@ pcm.ch2 {
         channels 2
         rate 48000
         format S16_LE
-        period_size 120
-        buffer_size 240
+        period_size 240
+        buffer_size 960
     }    
     bindings.0  1
 }

src/misc/install_asoundconf.sh

@@ -1 +1,2 @@
-sudo cp src/misc/asound.conf /etc/asound.conf
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+sudo cp "$SCRIPT_DIR/asound.conf" /etc/asound.conf