Add master volume sensor.

documentation/Sensors.md

@@ -20,6 +20,10 @@ The current clock speed sensor returns the base system clock as configured in th
 
 This sensor returns the current volume of playing audio. **It does not return the master volume.** If you have no sound playing the value will be 0.
 
+### MasterVolumeSensor
+
+This sensor returns the master volume for the currently selected default audio device.
+
 ###  DummySensor
 
 This sensor produces a random output every second, and is intended to test latency and connectivity.

hass-workstation-service/Communication/InterProcesCommunication/InterProcessApi.cs

@@ -185,6 +185,7 @@ namespace hass_workstation_service.Communication.InterProcesCommunication
                 AvailableSensors.CurrentVolumeSensor => new CurrentVolumeSensor(_publisher, (int)model.UpdateInterval, model.Name),
                 AvailableSensors.GPUTemperatureSensor => new GpuTemperatureSensor(_publisher, (int)model.UpdateInterval, model.Name),
                 AvailableSensors.GPULoadSensor => new GpuLoadSensor(_publisher, (int)model.UpdateInterval, model.Name),
+                AvailableSensors.MasterVolumeSensor => new MasterVolumeSensor(_publisher, (int)model.UpdateInterval, model.Name),
                 _ => null
             };
         }

hass-workstation-service/Communication/InterProcesCommunication/ServiceContractModels.cs

@@ -100,6 +100,7 @@ namespace hass_workstation_service.Communication.InterProcesCommunication.Models
         LastBootSensor,
         SessionStateSensor,
         CurrentVolumeSensor,
+        MasterVolumeSensor,
         GPUTemperatureSensor,
         GPULoadSensor
     }

hass-workstation-service/Data/ConfigurationService.cs

@@ -138,6 +138,9 @@ namespace hass_workstation_service.Data
                     case "CurrentVolumeSensor":
                         sensor = new CurrentVolumeSensor(publisher, configuredSensor.UpdateInterval, configuredSensor.Name, configuredSensor.Id);
                         break;
+                    case "MasterVolumeSensor":
+                        sensor = new MasterVolumeSensor(publisher, configuredSensor.UpdateInterval, configuredSensor.Name, configuredSensor.Id);
+                        break;
                     case "GpuTemperatureSensor":
                         sensor = new GpuTemperatureSensor(publisher, configuredSensor.UpdateInterval, configuredSensor.Name, configuredSensor.Id);
                         break;

hass-workstation-service/Domain/Sensors/MasterVolumeSensor.cs

@@ -0,0 +1,41 @@
+using CoreAudio;
+using hass_workstation_service.Communication;
+using System;
+using System.Globalization;
+
+namespace hass_workstation_service.Domain.Sensors
+{
+    public class MasterVolumeSensor : AbstractSensor
+    {
+        private MMDeviceEnumerator deviceEnumerator;
+
+        public MasterVolumeSensor(MqttPublisher publisher, int? updateInterval = null, string name = "MasterVolume", Guid id = default(Guid)) : base(publisher, name ?? "CurrentVolume", updateInterval ?? 10, id)
+        {
+            this.deviceEnumerator = new MMDeviceEnumerator();
+        }
+        public override SensorDiscoveryConfigModel GetAutoDiscoveryConfig()
+        {
+            return this._autoDiscoveryConfigModel ?? SetAutoDiscoveryConfigModel(new SensorDiscoveryConfigModel()
+            {
+                Name = this.Name,
+                Unique_id = this.Id.ToString(),
+                Device = this.Publisher.DeviceConfigModel,
+                State_topic = $"homeassistant/{this.Domain}/{Publisher.DeviceConfigModel.Name}/{this.ObjectId}/state",
+                Icon = "mdi:volume-medium",
+                Unit_of_measurement = "%",
+                Availability_topic = $"homeassistant/{this.Domain}/{Publisher.DeviceConfigModel.Name}/availability"
+            });
+        }
+
+        public override string GetState()
+        {
+            var defaultAudioDevice = deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia);
+
+            // check if the volume is muted
+            if (defaultAudioDevice.AudioEndpointVolume.Mute) return "0";
+
+            return Math.Round(defaultAudioDevice.AudioEndpointVolume.MasterVolumeLevelScalar * 100, 0) // round volume and convert to percent
+                .ToString(CultureInfo.InvariantCulture); // convert to string
+        }
+    }
+}