Make sure sessions get removed and add more logging

Audio/AudioDevice.cs

@@ -0,0 +1,88 @@
+using NAudio.CoreAudioApi;
+using NAudio.CoreAudioApi.Interfaces;
+using Serilog;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace WorkIndicator.Audio;
+
+internal class AudioDevice
+{
+    private readonly ILogger _logger;
+
+    public delegate void AudioSessionsChangedDelegate();
+
+    public event AudioSessionsChangedDelegate AudioSessionsChanged;
+
+    public bool IsMuted { get; private set; }
+
+    public string FriendlyName { get; }
+
+    public Dictionary<string, AudioSession> Sessions { get; } = new();
+
+    public AudioDevice(MMDevice device)
+    {
+        _logger = Log.ForContext<AudioDevice>();
+
+        FriendlyName = device.DeviceFriendlyName;
+        IsMuted = device.AudioEndpointVolume.Mute;
+
+        _logger.Information("AudioDevice: {name} {muted}", FriendlyName, IsMuted);
+
+        device.AudioEndpointVolume.OnVolumeNotification += AudioEndpointVolume_OnVolumeNotification;
+        device.AudioSessionManager.OnSessionCreated += AudioSessionManager_OnSessionCreated;
+
+        device.AudioSessionManager.RefreshSessions();
+        var sessions = device.AudioSessionManager.Sessions;
+
+        for (var i = 0; i < sessions.Count; i++)
+        {
+            SetupSession(sessions[i]);
+        }
+    }
+
+    private void AudioEndpointVolume_OnVolumeNotification(AudioVolumeNotificationData data)
+    {
+        _logger.Information("AudioEndpointVolume_OnVolumeNotification: {name} {muted}", FriendlyName, data.Muted);
+
+        IsMuted = data.Muted;
+
+        AudioSessionsChanged?.Invoke();
+    }
+
+    private void AudioSessionManager_OnSessionCreated(object sender, IAudioSessionControl newSession)
+    {
+        var session = new AudioSessionControl(newSession);
+
+        _logger.Information("OnSessionCreated: {name}", session.GetSessionIdentifier);
+
+        SetupSession(session);
+    }
+
+    private void SetupSession(AudioSessionControl session)
+    {
+        _logger.Information("SetupSession: {name}", session.GetSessionIdentifier);
+
+        var audioSession = new AudioSession(session, FriendlyName);
+        
+        Sessions[session.GetSessionIdentifier] = audioSession;
+
+        audioSession.AudioSessionChanged += AudioSession_AudioSessionChanged;
+
+        AudioSessionsChanged?.Invoke();
+    }
+
+    private void AudioSession_AudioSessionChanged(string id, AudioSessionState state)
+    {
+        _logger.Information("AudioSessionChanged: {id} {state}", id, state);
+
+        AudioSessionsChanged?.Invoke();
+
+        if (state == AudioSessionState.AudioSessionStateExpired)
+        {
+            Sessions.Remove(id);
+        }
+    }
+
+    public int ActiveSessionCount => Sessions.Values.Count(s => s.State == AudioSessionState.AudioSessionStateActive);
+}