Add a special case to make steam launched games not control steam's sound, because after fixing the process matching to make it pick up the right name and icon consistently, it makes it weirder for steam to have its volume changed unexpectedly

previously it was non-deterministic, so you would sometimes get steam icon with game name, or steam name and icon even though the game was being controlled.
This makes it more consistently the correct icon and name

src/FocusVolumeControl/AudioHelper.cs

@@ -1,67 +1,89 @@
-using CoreAudio;
+using FocusVolumeControl.AudioSessions;
-using FocusVolumeControl.AudioSessions;
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
+using System.Runtime.InteropServices;
 
 namespace FocusVolumeControl;
 
 public class AudioHelper
 {
-	IAudioSession _current;
+	static object _lock = new object();
 	List<Process> _currentProcesses;
 
-	public IAudioSession FindSession(List<Process> processes)
+	public IAudioSession Current { get; private set; }
-	{
-		var deviceEnumerator = new MMDeviceEnumerator(Guid.NewGuid());
-
-		using var device = deviceEnumerator.GetDefaultAudioEndpoint(DataFlow.Render, Role.Multimedia);
-		using var manager = device.AudioSessionManager2;
-
-		var sessions = manager.Sessions;
-
-		var matchingSession = new ActiveAudioSessionWrapper();
-
-		foreach (var session in sessions)
-		{
-			var audioProcess = Process.GetProcessById((int)session.ProcessID);
-
-			if (processes.Any(x => x.Id == session.ProcessID || x.ProcessName == audioProcess?.ProcessName))
-			{
-				try
-				{
-					var displayName = audioProcess.MainModule.FileVersionInfo.FileDescription;
-					if (string.IsNullOrEmpty(displayName))
-					{
-						displayName = audioProcess.ProcessName;
-					}
-					matchingSession.DisplayName = displayName;
-				}
-				catch
-				{
-					matchingSession.DisplayName ??= audioProcess.ProcessName;
-				}
-
-				matchingSession.ExecutablePath ??= audioProcess.MainModule.FileName;
-
-				//some apps like discord have multiple volume processes.
-				matchingSession.AddVolume(session.SimpleAudioVolume);
-			}
-		}
-		return matchingSession.Any() ? matchingSession : null;
-	}
-
-	static object _lock = new object();
 
 	public void ResetCache()
 	{
-		lock(_lock)
+		lock (_lock)
 		{
-			_current = null;
+			Current = null;
 		}
 	}
 
+	public IAudioSession FindSession(List<Process> processes)
+	{
+		var deviceEnumerator = (CoreAudio)new MMDeviceEnumerator();
+
+		deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia, out var device);
+
+		Guid iid = typeof(IAudioSessionManager2).GUID;
+		device.Activate(ref iid, 0, IntPtr.Zero, out var m);
+		var manager = (IAudioSessionManager2)m;
+
+
+		manager.GetSessionEnumerator(out var sessionEnumerator);
+
+		var results = new ActiveAudioSessionWrapper();
+		var currentIndex = int.MaxValue;
+
+		sessionEnumerator.GetCount(out var count);
+		for (int i = 0; i < count; i++)
+		{
+			sessionEnumerator.GetSession(i, out var session);
+
+			session.GetProcessId(out var sessionProcessId);
+			var audioProcess = Process.GetProcessById(sessionProcessId);
+
+			var index = processes.FindIndex(x => x.Id == sessionProcessId || x.ProcessName == audioProcess?.ProcessName);
+
+			if (index > -1)
+			{
+				//processes will be ordered from best to worst (starts with the app, goes to parent)
+				//so we want the display name and executable path to come from the process that is closest to the front of the list
+				//but we want all matching sessions so things like discord work right
+				if (index < currentIndex)
+				{
+					try
+					{
+						var displayName = audioProcess.MainModule.FileVersionInfo.FileDescription;
+						if (string.IsNullOrEmpty(displayName))
+						{
+							displayName = audioProcess.ProcessName;
+						}
+						results.DisplayName = displayName;
+					}
+					catch
+					{
+						results.DisplayName = audioProcess.ProcessName;
+					}
+
+					results.ExecutablePath = audioProcess.MainModule.FileName;
+
+					currentIndex = index;
+				}
+
+				//some apps like discord have multiple volume processes.
+				results.AddSession(session);
+
+			}
+		}
+
+		return results.Any() ? results : null;
+	}
+
+
 	public IAudioSession GetActiveSession(FallbackBehavior fallbackBehavior)
 	{
 		lock (_lock)
@@ -70,23 +92,23 @@ public class AudioHelper
 
 			if (_currentProcesses == null || !_currentProcesses.SequenceEqual(processes))
 			{
-				_current = FindSession(processes);
+				Current = FindSession(processes);
 			}
 
-			if(_current == null)
+			if (Current == null)
 			{
-				if(fallbackBehavior == FallbackBehavior.SystemSounds && _current is not SystemSoundsAudioSession)
+				if (fallbackBehavior == FallbackBehavior.SystemSounds && Current is not SystemSoundsAudioSession)
 				{
-					_current = GetSystemSounds();
+					Current = GetSystemSounds();
 				}
-				else if(fallbackBehavior == FallbackBehavior.SystemVolume && _current is not SystemVolumeAudioSession)
+				else if (fallbackBehavior == FallbackBehavior.SystemVolume && Current is not SystemVolumeAudioSession)
 				{
-					_current = GetSystemVolume();
+					Current = GetSystemVolume();
 				}
 			}
 
 			_currentProcesses = processes;
-			return _current;
+			return Current;
 		}
 	}
 
@@ -126,10 +148,21 @@ public class AudioHelper
 
 		try
 		{
-			var blah = ParentProcessUtilities.GetParentProcess(pid);
+			//note. in instances where you launch a game from steam. this ends up mapping the process to both steam and to the game. which is unfortunate
-			if (blah != null && blah.ProcessName != "explorer" && blah.ProcessName != "svchost")
+			//The problem is that if you don't use the parent processes, then the actual steam window won't get recognized. But if you do, then games will map to steam.
+			//
+			//Additionally, I group all audio processes that match instead of just the most specific, or the first, etc. Because Discord uses two processes, one for voice chat, and one for discord sounds.
+			//
+			//Steam and Discord are both very common, and end up butting heads in the algorithm.
+			//I want to avoid special cases, but since steam and discord are both so common, i'm making an exception.
+			var parentProcess = ParentProcessUtilities.GetParentProcess(pid);
+			if (parentProcess != null 
+				&& parentProcess.ProcessName != "explorer" 
+				&& parentProcess.ProcessName != "svchost"
+				&& (parentProcess.ProcessName == "steam" && processes.Any(x => x.ProcessName == "steamwebhelper")) //only include steam if the parent process is the steamwebhelper
+				)
 			{
-				processes.Add(blah);
+				processes.Add(parentProcess);
 			}
 		}
 		catch
@@ -142,47 +175,65 @@ public class AudioHelper
 
 	public void ResetAll()
 	{
-		try
+		var deviceEnumerator = (CoreAudio)new MMDeviceEnumerator();
+
+		deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia, out var device);
+
+		Guid iid = typeof(IAudioSessionManager2).GUID;
+		device.Activate(ref iid, 0, IntPtr.Zero, out var m);
+		var manager = (IAudioSessionManager2)m;
+
+
+		manager.GetSessionEnumerator(out var sessionEnumerator);
+
+		sessionEnumerator.GetCount(out var count);
+		for (int i = 0; i < count; i++)
 		{
-			var deviceEnumerator = new MMDeviceEnumerator(Guid.NewGuid());
+			sessionEnumerator.GetSession(i, out var session);
 
-			using var device = deviceEnumerator.GetDefaultAudioEndpoint(DataFlow.Render, Role.Multimedia);
+			var volume = (ISimpleAudioVolume)session;
-			using var manager = device.AudioSessionManager2;
+			var guid = Guid.Empty;
-
+			volume.SetMasterVolume(1, ref guid);
-			foreach (var session in manager.Sessions)
+			volume.SetMute(false, ref guid);
-			{
-				session.SimpleAudioVolume.MasterVolume = 1;
-				session.SimpleAudioVolume.Mute = false;
-			}
 		}
-		catch { }
 	}
 
 	public IAudioSession GetSystemSounds()
 	{
-		var deviceEnumerator = new MMDeviceEnumerator(Guid.NewGuid());
+		var deviceEnumerator = (CoreAudio)new MMDeviceEnumerator();
 
-		using var device = deviceEnumerator.GetDefaultAudioEndpoint(DataFlow.Render, Role.Multimedia);
+		deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia, out var device);
-		using var manager = device.AudioSessionManager2;
 
-		var sessions = manager.Sessions;
+		Guid iid = typeof(IAudioSessionManager2).GUID;
+		device.Activate(ref iid, 0, IntPtr.Zero, out var m);
+		var manager = (IAudioSessionManager2)m;
 
-		foreach (var session in sessions)
+
+		manager.GetSessionEnumerator(out var sessionEnumerator);
+
+		sessionEnumerator.GetCount(out var count);
+		for (int i = 0; i < count; i++)
 		{
-			if (session.IsSystemSoundsSession)
+			sessionEnumerator.GetSession(i, out var session);
+
+			if (session.IsSystemSoundsSession() == 0)
 			{
-				return new SystemSoundsAudioSession(session.SimpleAudioVolume);
+				return new SystemSoundsAudioSession(session);
 			}
 		}
-
 		return null;
 	}
 	public IAudioSession GetSystemVolume()
 	{
-		var deviceEnumerator = new MMDeviceEnumerator(Guid.NewGuid());
+		var deviceEnumerator = (CoreAudio)new MMDeviceEnumerator();
 
-		using var device = deviceEnumerator.GetDefaultAudioEndpoint(DataFlow.Render, Role.Multimedia);
+		deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia, out var device);
-		return new SystemVolumeAudioSession(device.AudioEndpointVolume);
+
+		Guid iid = typeof(IAudioEndpointVolume).GUID;
+		device.Activate(ref iid, 0, IntPtr.Zero, out var o);
+		var endpointVolume = (IAudioEndpointVolume)o;
+
+		return new SystemVolumeAudioSession(endpointVolume);
 	}
 
 }

src/FocusVolumeControl/AudioSessions/ActiveAudioSessionWrapper.cs

@@ -1,17 +1,18 @@
-using CoreAudio;
+using System;
-using System;
 using System.Collections.Generic;
 using System.Linq;
 using BarRaider.SdTools;
 using System.Drawing;
+using System.Runtime.InteropServices;
 
 namespace FocusVolumeControl.AudioSessions;
 
-public class ActiveAudioSessionWrapper : IAudioSession
+public sealed class ActiveAudioSessionWrapper : IAudioSession
 {
 	public string DisplayName { get; set; }
 	public string ExecutablePath { get; set; }
-	private List<SimpleAudioVolume> Volume { get; } = new List<SimpleAudioVolume>();
+	private List<IAudioSessionControl2> Sessions { get; } = new List<IAudioSessionControl2>();
+	private IEnumerable<ISimpleAudioVolume> Volume => Sessions.Cast<ISimpleAudioVolume>();
 
 	string _icon;
 
@@ -36,11 +37,11 @@ public class ActiveAudioSessionWrapper : IAudioSession
 	{
 		return Volume.Any();
 	}
-	public int Count => Volume.Count;
+	public int Count => Sessions.Count;
 
-	public void AddVolume(SimpleAudioVolume volume)
+	public void AddSession(IAudioSessionControl2 session)
 	{
-		Volume.Add(volume);
+		Sessions.Add(session);
 	}
 
 	public void ToggleMute()
@@ -51,28 +52,52 @@ public class ActiveAudioSessionWrapper : IAudioSession
 		//when any volumes are unmuted, Volume.All will return false
 		//so we set muted to true (opposite of Volume.All)
 
-		var muted = Volume.All(x => x.Mute);
+		var muted = IsMuted();
 
-		Volume.ForEach(x => x.Mute = !muted);
+		foreach(var v in Volume)
+		{
+			var guid = Guid.Empty;
+			v.SetMute(!muted, ref guid);
+		}
 	}
 
 	public bool IsMuted()
 	{
-		return Volume.All(x => x.Mute);
+		return Volume.All(x =>
+		{
+			x.GetMute(out var mute); 
+			return mute;
+		});
 	}
 
 	public void IncrementVolumeLevel(int step, int ticks)
 	{
 		//if you have more than one volume. they will all get set based on the first volume control
-		var level = Volume.FirstOrDefault()?.MasterVolume ?? 0;
+		var volume = Volume.FirstOrDefault();
+		var level = 0f;
+		if (volume != null)
+		{
+			volume.GetMasterVolume(out level);
+		}
+	
 		level = VolumeHelpers.GetAdjustedVolume(level, step, ticks);
-		Volume.ForEach(x => x.MasterVolume = level);
+
+		foreach(var v in Volume)
+		{
+			var guid = Guid.Empty;
+			v.SetMasterVolume(level, ref guid);
+		}
 	}
 
 	public int GetVolumeLevel()
 	{
-		var level = Volume.FirstOrDefault()?.MasterVolume ?? 0;
+		var volume = Volume.FirstOrDefault();
+		var level = 0f;
+		if(volume != null)
+		{
+			volume.GetMasterVolume(out level);
+		}
+
 		return VolumeHelpers.GetVolumePercentage(level);
 	}
-
 }

src/FocusVolumeControl/AudioSessions/CoreAudio.cs

@@ -0,0 +1,306 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace FocusVolumeControl.AudioSessions;
+
+
+[ComImport]
+[Guid("BCDE0395-E52F-467C-8E3D-C4579291692E")]
+internal class MMDeviceEnumerator
+{
+}
+
+internal enum EDataFlow
+{
+	eRender,
+	eCapture,
+	eAll,
+	EDataFlow_enum_count
+}
+
+internal enum ERole
+{
+	eConsole,
+	eMultimedia,
+	eCommunications,
+	ERole_enum_count
+}
+
+[Guid("A95664D2-9614-4F35-A746-DE8DB63617E6"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+internal interface CoreAudio
+{
+	int NotImpl1();
+
+	[PreserveSig]
+	int GetDefaultAudioEndpoint(EDataFlow dataFlow, ERole role, out IMMDevice ppDevice);
+}
+
+[Guid("D666063F-1587-4E43-81F1-B948E807363F"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+internal interface IMMDevice
+{
+	[PreserveSig]
+	int Activate(ref Guid iid, int dwClsCtx, IntPtr pActivationParams, [MarshalAs(UnmanagedType.IUnknown)] out object ppInterface);
+}
+
+[Guid("77AA99A0-1BD6-484F-8BC7-2C654C9A9B6F"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+internal interface IAudioSessionManager2
+{
+	int NotImpl1();
+	int NotImpl2();
+
+	[PreserveSig]
+	int GetSessionEnumerator(out IAudioSessionEnumerator SessionEnum);
+}
+
+[Guid("E2F5BB11-0570-40CA-ACDD-3AA01277DEE8"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+internal interface IAudioSessionEnumerator
+{
+	[PreserveSig]
+	int GetCount(out int SessionCount);
+
+	[PreserveSig]
+	int GetSession(int SessionCount, out IAudioSessionControl2 Session);
+}
+
+[Guid("87CE5498-68D6-44E5-9215-6DA47EF883D8"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+internal interface ISimpleAudioVolume
+{
+	[PreserveSig]
+	int SetMasterVolume(float fLevel, ref Guid EventContext);
+
+	[PreserveSig]
+	int GetMasterVolume(out float pfLevel);
+
+	[PreserveSig]
+	int SetMute(bool bMute, ref Guid EventContext);
+
+	[PreserveSig]
+	int GetMute(out bool pbMute);
+}
+
+[Guid("bfb7ff88-7239-4fc9-8fa2-07c950be9c6d"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+public interface IAudioSessionControl2
+{
+	// IAudioSessionControl
+	[PreserveSig]
+	int NotImpl0();
+
+	[PreserveSig]
+	int GetDisplayName([MarshalAs(UnmanagedType.LPWStr)] out string pRetVal);
+
+	[PreserveSig]
+	int SetDisplayName([MarshalAs(UnmanagedType.LPWStr)] string Value, [MarshalAs(UnmanagedType.LPStruct)] Guid EventContext);
+
+	[PreserveSig]
+	int GetIconPath([MarshalAs(UnmanagedType.LPWStr)] out string pRetVal);
+
+	[PreserveSig]
+	int SetIconPath([MarshalAs(UnmanagedType.LPWStr)] string Value, [MarshalAs(UnmanagedType.LPStruct)] Guid EventContext);
+
+	[PreserveSig]
+	int GetGroupingParam(out Guid pRetVal);
+
+	[PreserveSig]
+	int SetGroupingParam([MarshalAs(UnmanagedType.LPStruct)] Guid Override, [MarshalAs(UnmanagedType.LPStruct)] Guid EventContext);
+
+	[PreserveSig]
+	int NotImpl1();
+
+	[PreserveSig]
+	int NotImpl2();
+
+	// IAudioSessionControl2
+	[PreserveSig]
+	int GetSessionIdentifier([MarshalAs(UnmanagedType.LPWStr)] out string pRetVal);
+
+	[PreserveSig]
+	int GetSessionInstanceIdentifier([MarshalAs(UnmanagedType.LPWStr)] out string pRetVal);
+
+	[PreserveSig]
+	int GetProcessId(out int pRetVal);
+
+	[PreserveSig]
+	int IsSystemSoundsSession();
+
+	[PreserveSig]
+	int SetDuckingPreference(bool optOut);
+}
+
+// http://netcoreaudio.codeplex.com/SourceControl/latest#trunk/Code/CoreAudio/Interfaces/IAudioEndpointVolume.cs
+[Guid("5CDF2C82-841E-4546-9722-0CF74078229A"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+public interface IAudioEndpointVolume
+{
+	[PreserveSig]
+	int NotImpl1();
+
+	[PreserveSig]
+	int NotImpl2();
+
+	/// <summary>
+	/// Gets a count of the channels in the audio stream.
+	/// </summary>
+	/// <param name="channelCount">The number of channels.</param>
+	/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
+	[PreserveSig]
+	int GetChannelCount(
+		[Out][MarshalAs(UnmanagedType.U4)] out UInt32 channelCount);
+
+	/// <summary>
+	/// Sets the master volume level of the audio stream, in decibels.
+	/// </summary>
+	/// <param name="level">The new master volume level in decibels.</param>
+	/// <param name="eventContext">A user context value that is passed to the notification callback.</param>
+	/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
+	[PreserveSig]
+	int SetMasterVolumeLevel(
+		[In][MarshalAs(UnmanagedType.R4)] float level,
+		[In][MarshalAs(UnmanagedType.LPStruct)] Guid eventContext);
+
+	/// <summary>
+	/// Sets the master volume level, expressed as a normalized, audio-tapered value.
+	/// </summary>
+	/// <param name="level">The new master volume level expressed as a normalized value between 0.0 and 1.0.</param>
+	/// <param name="eventContext">A user context value that is passed to the notification callback.</param>
+	/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
+	[PreserveSig]
+	int SetMasterVolumeLevelScalar(
+		[In][MarshalAs(UnmanagedType.R4)] float level,
+		[In][MarshalAs(UnmanagedType.LPStruct)] Guid eventContext);
+
+	/// <summary>
+	/// Gets the master volume level of the audio stream, in decibels.
+	/// </summary>
+	/// <param name="level">The volume level in decibels.</param>
+	/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
+	[PreserveSig]
+	int GetMasterVolumeLevel(
+		[Out][MarshalAs(UnmanagedType.R4)] out float level);
+
+	/// <summary>
+	/// Gets the master volume level, expressed as a normalized, audio-tapered value.
+	/// </summary>
+	/// <param name="level">The volume level expressed as a normalized value between 0.0 and 1.0.</param>
+	/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
+	[PreserveSig]
+	int GetMasterVolumeLevelScalar(
+		[Out][MarshalAs(UnmanagedType.R4)] out float level);
+
+	/// <summary>
+	/// Sets the volume level, in decibels, of the specified channel of the audio stream.
+	/// </summary>
+	/// <param name="channelNumber">The channel number.</param>
+	/// <param name="level">The new volume level in decibels.</param>
+	/// <param name="eventContext">A user context value that is passed to the notification callback.</param>
+	/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
+	[PreserveSig]
+	int SetChannelVolumeLevel(
+		[In][MarshalAs(UnmanagedType.U4)] UInt32 channelNumber,
+		[In][MarshalAs(UnmanagedType.R4)] float level,
+		[In][MarshalAs(UnmanagedType.LPStruct)] Guid eventContext);
+
+	/// <summary>
+	/// Sets the normalized, audio-tapered volume level of the specified channel in the audio stream.
+	/// </summary>
+	/// <param name="channelNumber">The channel number.</param>
+	/// <param name="level">The new master volume level expressed as a normalized value between 0.0 and 1.0.</param>
+	/// <param name="eventContext">A user context value that is passed to the notification callback.</param>
+	/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
+	[PreserveSig]
+	int SetChannelVolumeLevelScalar(
+		[In][MarshalAs(UnmanagedType.U4)] UInt32 channelNumber,
+		[In][MarshalAs(UnmanagedType.R4)] float level,
+		[In][MarshalAs(UnmanagedType.LPStruct)] Guid eventContext);
+
+	/// <summary>
+	/// Gets the volume level, in decibels, of the specified channel in the audio stream.
+	/// </summary>
+	/// <param name="channelNumber">The zero-based channel number.</param>
+	/// <param name="level">The volume level in decibels.</param>
+	/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
+	[PreserveSig]
+	int GetChannelVolumeLevel(
+		[In][MarshalAs(UnmanagedType.U4)] UInt32 channelNumber,
+		[Out][MarshalAs(UnmanagedType.R4)] out float level);
+
+	/// <summary>
+	/// Gets the normalized, audio-tapered volume level of the specified channel of the audio stream.
+	/// </summary>
+	/// <param name="channelNumber">The zero-based channel number.</param>
+	/// <param name="level">The volume level expressed as a normalized value between 0.0 and 1.0.</param>
+	/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
+	[PreserveSig]
+	int GetChannelVolumeLevelScalar(
+		[In][MarshalAs(UnmanagedType.U4)] UInt32 channelNumber,
+		[Out][MarshalAs(UnmanagedType.R4)] out float level);
+
+	/// <summary>
+	/// Sets the muting state of the audio stream.
+	/// </summary>
+	/// <param name="isMuted">True to mute the stream, or false to unmute the stream.</param>
+	/// <param name="eventContext">A user context value that is passed to the notification callback.</param>
+	/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
+	[PreserveSig]
+	int SetMute(
+		[In][MarshalAs(UnmanagedType.Bool)] Boolean isMuted,
+		[In][MarshalAs(UnmanagedType.LPStruct)] Guid eventContext);
+
+	/// <summary>
+	/// Gets the muting state of the audio stream.
+	/// </summary>
+	/// <param name="isMuted">The muting state. True if the stream is muted, false otherwise.</param>
+	/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
+	[PreserveSig]
+	int GetMute(
+		[Out][MarshalAs(UnmanagedType.Bool)] out Boolean isMuted);
+
+	/// <summary>
+	/// Gets information about the current step in the volume range.
+	/// </summary>
+	/// <param name="step">The current zero-based step index.</param>
+	/// <param name="stepCount">The total number of steps in the volume range.</param>
+	/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
+	[PreserveSig]
+	int GetVolumeStepInfo(
+		[Out][MarshalAs(UnmanagedType.U4)] out UInt32 step,
+		[Out][MarshalAs(UnmanagedType.U4)] out UInt32 stepCount);
+
+	/// <summary>
+	/// Increases the volume level by one step.
+	/// </summary>
+	/// <param name="eventContext">A user context value that is passed to the notification callback.</param>
+	/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
+	[PreserveSig]
+	int VolumeStepUp(
+		[In][MarshalAs(UnmanagedType.LPStruct)] Guid eventContext);
+
+	/// <summary>
+	/// Decreases the volume level by one step.
+	/// </summary>
+	/// <param name="eventContext">A user context value that is passed to the notification callback.</param>
+	/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
+	[PreserveSig]
+	int VolumeStepDown(
+		[In][MarshalAs(UnmanagedType.LPStruct)] Guid eventContext);
+
+	/// <summary>
+	/// Queries the audio endpoint device for its hardware-supported functions.
+	/// </summary>
+	/// <param name="hardwareSupportMask">A hardware support mask that indicates the capabilities of the endpoint.</param>
+	/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
+	[PreserveSig]
+	int QueryHardwareSupport(
+		[Out][MarshalAs(UnmanagedType.U4)] out UInt32 hardwareSupportMask);
+
+	/// <summary>
+	/// Gets the volume range of the audio stream, in decibels.
+	/// </summary>
+	/// <param name="volumeMin">The minimum volume level in decibels.</param>
+	/// <param name="volumeMax">The maximum volume level in decibels.</param>
+	/// <param name="volumeStep">The volume increment level in decibels.</param>
+	/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
+	[PreserveSig]
+	int GetVolumeRange(
+		[Out][MarshalAs(UnmanagedType.R4)] out float volumeMin,
+		[Out][MarshalAs(UnmanagedType.R4)] out float volumeMax,
+		[Out][MarshalAs(UnmanagedType.R4)] out float volumeStep);
+}

src/FocusVolumeControl/AudioSessions/IAudioSession.cs

@@ -1,4 +1,6 @@
-namespace FocusVolumeControl.AudioSessions;
+using System;
+
+namespace FocusVolumeControl.AudioSessions;
 
 public interface IAudioSession
 {

src/FocusVolumeControl/AudioSessions/SystemSoundsAudioSession.cs

@@ -1,33 +1,46 @@
-using CoreAudio;
+using System;
-using System;
+using System.Runtime.InteropServices;
 
 namespace FocusVolumeControl.AudioSessions;
 
-internal class SystemSoundsAudioSession : IAudioSession
+internal sealed class SystemSoundsAudioSession : IAudioSession
 {
-	public SystemSoundsAudioSession(SimpleAudioVolume volumeControl)
+	public SystemSoundsAudioSession(IAudioSessionControl2 sessionControl)
 	{
-		_volumeControl = volumeControl;
+		_sessionControl = sessionControl;
+		_volumeControl = (ISimpleAudioVolume)sessionControl;
 	}
 
-	SimpleAudioVolume _volumeControl;
+	IAudioSessionControl2 _sessionControl;
+	ISimpleAudioVolume _volumeControl;
 
 	public string DisplayName => "System sounds";
 	public string GetIcon() => "Images/systemSounds";
 
 	public void ToggleMute()
 	{
-		_volumeControl.Mute = !_volumeControl.Mute;
+		var guid = Guid.Empty;
+		_volumeControl.SetMute(!IsMuted(), ref guid);
 	}
 
-	public bool IsMuted() => _volumeControl.Mute;
+	public bool IsMuted()
+	{
+		_volumeControl.GetMute(out var mute);
+		return mute;
+	}
 
 	public void IncrementVolumeLevel(int step, int ticks)
 	{
-		var level = VolumeHelpers.GetAdjustedVolume(_volumeControl.MasterVolume, step, ticks);
+		_volumeControl.GetMasterVolume(out var level);
-		_volumeControl.MasterVolume = level;
+		level = VolumeHelpers.GetAdjustedVolume(level, step, ticks);
+
+		var guid = Guid.Empty;
+		_volumeControl.SetMasterVolume(level, ref guid);
 	}
 
-	public int GetVolumeLevel() => VolumeHelpers.GetVolumePercentage(_volumeControl.MasterVolume);
+	public int GetVolumeLevel()
-
+	{
+		_volumeControl.GetMasterVolume(out var level);
+		return VolumeHelpers.GetVolumePercentage(level);
+	}
 }

src/FocusVolumeControl/AudioSessions/SystemVolumeAudioSession.cs

@@ -1,33 +1,41 @@
-using CoreAudio;
+using System;
-using System;
+using System.Runtime.InteropServices;
 
 namespace FocusVolumeControl.AudioSessions;
 
-internal class SystemVolumeAudioSession : IAudioSession
+internal sealed class SystemVolumeAudioSession : IAudioSession
 {
-	public SystemVolumeAudioSession(AudioEndpointVolume volumeControl)
+	public SystemVolumeAudioSession(IAudioEndpointVolume volumeControl)
 	{
 		_volumeControl = volumeControl;
 	}
 
-	AudioEndpointVolume _volumeControl;
+	IAudioEndpointVolume _volumeControl;
 
 	public string DisplayName => "System Volume";
 	public string GetIcon() => "Images/encoderIcon";
 
 	public void ToggleMute()
 	{
-		_volumeControl.Mute = !_volumeControl.Mute;
+		_volumeControl.SetMute(!IsMuted(), Guid.Empty);
 	}
 
-	public bool IsMuted() => _volumeControl.Mute;
+	public bool IsMuted()
+	{
+		_volumeControl.GetMute(out var mute);
+		return mute;
+	}
 
 	public void IncrementVolumeLevel(int step, int ticks)
 	{
-		var level = VolumeHelpers.GetAdjustedVolume(_volumeControl.MasterVolumeLevelScalar, step, ticks);
+		_volumeControl.GetMasterVolumeLevelScalar(out var level);
-		_volumeControl.MasterVolumeLevelScalar = level;
+		level = VolumeHelpers.GetAdjustedVolume(level, step, ticks);
+		_volumeControl.SetMasterVolumeLevelScalar(level, Guid.Empty);
 	}
 
-	public int GetVolumeLevel() => VolumeHelpers.GetVolumePercentage(_volumeControl.MasterVolumeLevelScalar);
+	public int GetVolumeLevel()
-
+	{
+		_volumeControl.GetMasterVolumeLevelScalar(out var level);
+		return VolumeHelpers.GetVolumePercentage(level);
+	}
 }

src/FocusVolumeControl/AudioSessions/VolumeHelpers.cs

@@ -10,6 +10,11 @@ namespace FocusVolumeControl.AudioSessions
 	{
 		public static float GetAdjustedVolume(float startingVolume, int step, int ticks)
 		{
+			if(step <= 0)
+			{
+				step = 1;
+			}
+
 			var level = startingVolume;
 
 			level += 0.01f * step * ticks;

src/FocusVolumeControl/DialAction.cs

@@ -26,21 +26,13 @@ public class DialAction : EncoderBase
 		{
 			PluginSettings instance = new PluginSettings();
 			instance.FallbackBehavior = FallbackBehavior.SystemSounds;
+			instance.StepSize = 1;
 			return instance;
 		}
 	}
 
-	private PluginSettings settings;
+	PluginSettings settings;
-
-	IntPtr _foregroundWindowChangedEvent;
-	Native.WinEventDelegate _delegate;
-
-	IAudioSession _currentAudioSession;
 	AudioHelper _audioHelper = new AudioHelper();
-
-	Thread _thread;
-	Dispatcher _dispatcher;
-
 	UIState _previousState;
 
 	public DialAction(ISDConnection connection, InitialPayload payload) : base(connection, payload)
@@ -48,46 +40,30 @@ public class DialAction : EncoderBase
 		if (payload.Settings == null || payload.Settings.Count == 0)
 		{
 			settings = PluginSettings.CreateDefaultSettings();
-			SaveSettings();
+			_ = SaveSettings();
 		}
 		else
 		{
 			settings = payload.Settings.ToObject<PluginSettings>();
 		}
 
-		_thread = new Thread(() =>
+		WindowChangedEventLoop.Instance.WindowChanged += WindowChanged;
-		{
-			Logger.Instance.LogMessage(TracingLevel.DEBUG, "Registering for events");
-			_delegate = new Native.WinEventDelegate(WinEventProc);
-			_foregroundWindowChangedEvent = Native.RegisterForForegroundWindowChangedEvent(_delegate);
 
-			Logger.Instance.LogMessage(TracingLevel.DEBUG, "Starting Dispatcher");
+		var session = _audioHelper.GetActiveSession(settings.FallbackBehavior);
-			_dispatcher = Dispatcher.CurrentDispatcher;
+		_ = UpdateStateIfNeeded(session);
-			Dispatcher.Run();
-			Logger.Instance.LogMessage(TracingLevel.DEBUG, "Dispatcher Stopped");
-		});
-		_thread.SetApartmentState(ApartmentState.STA);
-		_thread.Start();
-
-		_currentAudioSession = settings.FallbackBehavior == FallbackBehavior.SystemSounds ? _audioHelper.GetSystemSounds() : _audioHelper.GetSystemVolume();
-		_ = UpdateStateIfNeeded();
 	}
 
 	public override void Dispose()
 	{
-		Logger.Instance.LogMessage(TracingLevel.DEBUG, "Disposing");
+		//Logger.Instance.LogMessage(TracingLevel.DEBUG, "Disposing");
-		if (_foregroundWindowChangedEvent != IntPtr.Zero)
+		WindowChangedEventLoop.Instance.WindowChanged -= WindowChanged;
-		{
-			Native.UnhookWinEvent(_foregroundWindowChangedEvent);
-		}
-		_dispatcher.InvokeShutdown();
 	}
 
 	public override async void DialDown(DialPayload payload)
 	{
 		try
 		{
-			Logger.Instance.LogMessage(TracingLevel.INFO, "Dial Down");
+			//Logger.Instance.LogMessage(TracingLevel.INFO, "Dial Down");
 			await ToggleMuteAsync();
 		}
 		catch (Exception ex)
@@ -101,7 +77,7 @@ public class DialAction : EncoderBase
 	{
 		try
 		{
-			Logger.Instance.LogMessage(TracingLevel.INFO, "Touch Press");
+			//Logger.Instance.LogMessage(TracingLevel.INFO, "Touch Press");
 			if (payload.IsLongPress)
 			{
 				await ResetAllAsync();
@@ -121,12 +97,13 @@ public class DialAction : EncoderBase
 	{
 		try
 		{
-			Logger.Instance.LogMessage(TracingLevel.INFO, "Dial Rotate");
+			//Logger.Instance.LogMessage(TracingLevel.INFO, "Dial Rotate");
 			//dial rotated. ticks positive for right, negative for left
-			if (_currentAudioSession != null)
+			var activeSession = _audioHelper.Current;
+			if (activeSession != null)
 			{
-				_currentAudioSession.IncrementVolumeLevel(settings.StepSize, payload.Ticks);
+				activeSession.IncrementVolumeLevel(settings.StepSize, payload.Ticks);
-				await UpdateStateIfNeeded();
+				await UpdateStateIfNeeded(activeSession);
 			}
 			else
 			{
@@ -159,10 +136,11 @@ public class DialAction : EncoderBase
 	{
 		try
 		{
-			if (_currentAudioSession != null)
+			var activeSession = _audioHelper.Current;
+			if (activeSession != null)
 			{
-				_currentAudioSession.ToggleMute();
+				activeSession.ToggleMute();
-				await UpdateStateIfNeeded();
+				await UpdateStateIfNeeded(activeSession);
 			}
 			else
 			{
@@ -184,12 +162,7 @@ public class DialAction : EncoderBase
 			//called once every 1000ms and can be used for updating the title/image of the key
 			var activeSession = _audioHelper.GetActiveSession(settings.FallbackBehavior);
 
-			if (activeSession != null)
+			await UpdateStateIfNeeded(activeSession);
-			{
-				_currentAudioSession = activeSession;
-			}
-
-			await UpdateStateIfNeeded();
 		}
 		catch (Exception ex)
 		{
@@ -198,14 +171,14 @@ public class DialAction : EncoderBase
 		}
 	}
 
-	private async Task UpdateStateIfNeeded()
+	private async Task UpdateStateIfNeeded(IAudioSession audioSession)
 	{
 		try
 		{
-			if (_currentAudioSession != null)
+			if (audioSession != null)
 			{
 
-				var uiState = new UIState(_currentAudioSession);
+				var uiState = new UIState(audioSession);
 
 				if (_previousState != null && uiState != null &&
 					uiState.Title == _previousState.Title &&
@@ -241,7 +214,7 @@ public class DialAction : EncoderBase
 		try
 		{
 			Tools.AutoPopulateSettings(settings, payload.Settings);
-			SaveSettings();
+			_ = SaveSettings();
 		}
 		catch (Exception ex)
 		{
@@ -262,7 +235,7 @@ public class DialAction : EncoderBase
 	}
 
 
-	public void WinEventProc(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime)
+	public void WindowChanged()
 	{
 		try
 		{
@@ -270,7 +243,7 @@ public class DialAction : EncoderBase
 		}
 		catch (Exception ex)
 		{
-			Logger.Instance.LogMessage(TracingLevel.ERROR, $"Unexpected Error in DialDown:\n {ex}");
+			Logger.Instance.LogMessage(TracingLevel.ERROR, $"Unexpected Error in Window Down:\n {ex}");
 		}
 	}
 }

src/FocusVolumeControl/FocusVolumeControl.csproj

@@ -56,6 +56,7 @@
   <ItemGroup>
     <Compile Include="AudioSessions\ActiveAudioSessionWrapper.cs" />
     <Compile Include="AudioHelper.cs" />
+    <Compile Include="AudioSessions\CoreAudio.cs" />
     <Compile Include="AudioSessions\VolumeHelpers.cs" />
     <Compile Include="AudioSessions\SystemSoundsAudioSession.cs" />
     <Compile Include="AudioSessions\SystemVolumeAudioSession.cs" />
@@ -69,6 +70,7 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="UI\UIState.cs" />
     <Compile Include="UI\ValueWithOpacity.cs" />
+    <Compile Include="WindowChangedEventLoop.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="App.config" />
@@ -92,9 +94,6 @@
     </Content>
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="CoreAudio">
-      <Version>1.27.0</Version>
-    </PackageReference>
     <PackageReference Include="IsExternalInit">
       <Version>1.0.3</Version>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>

src/FocusVolumeControl/WindowChangedEventLoop.cs

@@ -0,0 +1,54 @@
+using BarRaider.SdTools;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Windows.Threading;
+
+namespace FocusVolumeControl
+{
+	internal class WindowChangedEventLoop
+	{
+		private static readonly Lazy<WindowChangedEventLoop> _lazy = new Lazy<WindowChangedEventLoop>(() => new WindowChangedEventLoop());
+		public static WindowChangedEventLoop Instance => _lazy.Value;
+
+		readonly Thread _thread;
+		Dispatcher _dispatcher;
+
+		IntPtr _foregroundWindowChangedEvent;
+		Native.WinEventDelegate _delegate;
+
+		private WindowChangedEventLoop()
+		{
+			_thread = new Thread(() =>
+			{
+				Logger.Instance.LogMessage(TracingLevel.DEBUG, "Starting Window Changed Event Loop");
+				_delegate = new Native.WinEventDelegate(WinEventProc);
+				_foregroundWindowChangedEvent = Native.RegisterForForegroundWindowChangedEvent(_delegate);
+
+				_dispatcher = Dispatcher.CurrentDispatcher;
+				Dispatcher.Run();
+				Logger.Instance.LogMessage(TracingLevel.DEBUG, "Window Changed Event Loop Stopped");
+			});
+			_thread.SetApartmentState(ApartmentState.STA);
+			_thread.Start();
+		}
+
+		public event Action WindowChanged;
+
+		private void WinEventProc(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime)
+		{
+			try
+			{
+				WindowChanged?.Invoke();
+			}
+			catch (Exception ex)
+			{
+				Logger.Instance.LogMessage(TracingLevel.ERROR, $"Unexpected Error in EventHandler:\n {ex}");
+			}
+		}
+	}
+}

src/FocusVolumeControl/manifest.json

@@ -33,7 +33,7 @@
   "Name": "Focused Application Volume",
   "Description": "Control the volume of the focused application",
   "URL": "https://github.com/dlprows/FocusVolumeControl",
-  "Version": "1.1.0",
+  "Version": "1.1.2",
   "CodePath": "FocusVolumeControl",
   "Category": "Volume Control [dlprows]",
   "Icon": "Images/pluginIcon",