impelement a gain slider

src/auracast/auracast_config.py

@@ -111,3 +111,4 @@ class AuracastConfigGroup(AuracastGlobalConfig):
     bigs: List[AuracastBigConfig] = [
         AuracastBigConfigDeu(),
     ]
+    analog_gain: int = 50  # ADC gain level for analog mode (10-60%)

src/auracast/server/multicast_frontend.py

@@ -196,6 +196,20 @@ if audio_mode == "Demo":
 else:
     start_stream, stop_stream = render_stream_controls(is_streaming, "Start Auracast", "Stop Auracast", running_mode, secondary_is_streaming)
 
+# Analog gain control (only for Analog mode, placed below start button)
+analog_gain_value = 50  # default
+if audio_mode == "Analog":
+    saved_analog_gain = saved_settings.get('analog_gain', 50)
+    analog_gain_value = st.slider(
+        "Analog Input Gain",
+        min_value=10,
+        max_value=60,
+        value=min(saved_analog_gain, 60),
+        step=5,
+        disabled=is_streaming,
+        help="ADC gain level for both analog inputs (10-60%). Default is 50%."
+    )
+
 # Placeholder for validation errors (will be filled in later)
 validation_error_placeholder = st.empty()
 
@@ -602,6 +616,7 @@ else:
                     'immediate_rendering': immediate_rendering2,
                     'presentation_delay_ms': presentation_delay_ms2,
                     'qos_preset': qos_preset2,
+                    'analog_gain': analog_gain_value,
                 }
 
         radio1_cfg = {
@@ -616,7 +631,8 @@ else:
             'immediate_rendering': immediate_rendering1,
             'presentation_delay_ms': presentation_delay_ms1,
             'qos_preset': qos_preset1,
-            'stereo_mode': stereo_enabled,  # Add stereo mode setting
+            'stereo_mode': stereo_enabled,
+            'analog_gain': analog_gain_value,
         }
 
     if audio_mode == "Network - Dante":
@@ -1499,6 +1515,7 @@ if start_stream:
                 immediate_rendering=bool(cfg['immediate_rendering']),
                 presentation_delay_us=int(cfg['presentation_delay_ms'] * 1000),
                 qos_config=QOS_PRESET_MAP[cfg['qos_preset']],
+                analog_gain=cfg.get('analog_gain', 50),
                 bigs=[
                     auracast_config.AuracastBigConfig(
                         id=cfg.get('id', 123456),

src/auracast/server/multicast_server.py

@@ -238,12 +238,16 @@ async def _init_i2c_on_startup() -> None:
             log.warning("Exception running i2cget (%s): %s", " ".join(read_cmd), e, exc_info=True)
 
 
-async def _set_adc_level_on_startup() -> None:
-    """Ensure ADC mixer level is set at startup.
+async def _set_adc_level(gain_percent: int = 50) -> None:
+    """Set ADC mixer level.
 
-    Runs: amixer -c 2 set 'ADC' x%
+    Runs: amixer -c 1 set 'ADC' x%
+    
+    Args:
+        gain_percent: Gain level 10-60, default 50 (above 60% causes clipping/silence)
     """
-    cmd = ["amixer", "-c", "2", "set", "ADC", "80%"]
+    gain_percent = max(10, min(60, gain_percent))
+    cmd = ["amixer", "-c", "1", "set", "ADC", f"{gain_percent}%"]
     try:
         proc = await asyncio.create_subprocess_exec(
             *cmd,
@@ -338,6 +342,9 @@ async def init_radio(transport: str, conf: auracast_config.AuracastConfigGroup,
 
             if input_device_name in ('ch1', 'ch2'):
                 audio_mode_persist = 'Analog'
+                # Set ADC gain level for analog mode
+                analog_gain = getattr(conf, 'analog_gain', 50)
+                await _set_adc_level(analog_gain)
             elif input_device_name in dante_channels:
                 audio_mode_persist = 'Network - Dante'
             else:
@@ -485,6 +492,7 @@ async def init_radio(transport: str, conf: auracast_config.AuracastConfigGroup,
             'immediate_rendering': getattr(conf, 'immediate_rendering', False),
             'assisted_listening_stream': getattr(conf, 'assisted_listening_stream', False),
             'analog_stereo_mode': getattr(conf.bigs[0], 'analog_stereo_mode', False) if conf.bigs else False,
+            'analog_gain': getattr(conf, 'analog_gain', 50),
             'stream_password': (conf.bigs[0].code if conf.bigs and getattr(conf.bigs[0], 'code', None) else None),
             'big_ids': [getattr(big, 'id', DEFAULT_BIG_ID) for big in conf.bigs],
             'big_random_addresses': [getattr(big, 'random_address', DEFAULT_RANDOM_ADDRESS) for big in conf.bigs],
@@ -737,6 +745,7 @@ async def _autostart_from_settings():
                     immediate_rendering=immediate_rendering,
                     assisted_listening_stream=assisted_listening_stream,
                     presentation_delay_us=pres_delay if pres_delay is not None else 40000,
+                    analog_gain=settings.get('analog_gain', 50),
                     bigs=bigs,
                 )
                 # Set num_bis for stereo mode if needed
@@ -890,6 +899,7 @@ async def _autostart_from_settings():
                     immediate_rendering=immediate_rendering,
                     assisted_listening_stream=assisted_listening_stream,
                     presentation_delay_us=pres_delay if pres_delay is not None else 40000,
+                    analog_gain=settings.get('analog_gain', 50),
                     bigs=bigs,
                 )
                 conf.qos_config = QOS_PRESET_MAP.get(saved_qos_preset, QOS_PRESET_MAP["Fast"])
@@ -926,8 +936,8 @@ async def _startup_autostart_event():
     # Hydrate settings cache once to avoid disk I/O during /status
     _init_settings_cache_from_disk()
     await _init_i2c_on_startup()
-    # Ensure ADC mixer level is set at startup
-    await _set_adc_level_on_startup()
+    # Ensure ADC mixer level is set at startup (default 50%)
+    await _set_adc_level(50)
     refresh_pw_cache()
     log.info("[STARTUP] Scheduling autostart task")
     asyncio.create_task(_autostart_from_settings())