src/FocusVolumeControl/AudioHelper.cs

@@ -1,51 +1,33 @@
-using FocusVolumeControl.AudioSessions;
+using CoreAudio;
+using FocusVolumeControl.AudioSessions;
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
-using System.Runtime.InteropServices;
 
 namespace FocusVolumeControl;
 
 public class AudioHelper
 {
-	static object _lock = new object();
+	IAudioSession _current;
 	List<Process> _currentProcesses;
 
-	public IAudioSession Current { get; private set; }
-
-	public void ResetCache()
-	{
-		lock (_lock)
-		{
-			Current = null;
-		}
-	}
-
 	public IAudioSession FindSession(List<Process> processes)
 	{
-		var deviceEnumerator = (CoreAudio)new MMDeviceEnumerator();
+		var deviceEnumerator = new MMDeviceEnumerator(Guid.NewGuid());
 
-		deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia, out var device);
+		using var device = deviceEnumerator.GetDefaultAudioEndpoint(DataFlow.Render, Role.Multimedia);
+		using var manager = device.AudioSessionManager2;
 
-		Guid iid = typeof(IAudioSessionManager2).GUID;
+		var sessions = manager.Sessions;
-		device.Activate(ref iid, 0, IntPtr.Zero, out var m);
-		var manager = (IAudioSessionManager2)m;
 
+		var matchingSession = new ActiveAudioSessionWrapper();
 
-		manager.GetSessionEnumerator(out var sessionEnumerator);
+		foreach (var session in sessions)
-
-		var results = new ActiveAudioSessionWrapper();
-
-		sessionEnumerator.GetCount(out var count);
-		for (int i = 0; i < count; i++)
 		{
-			sessionEnumerator.GetSession(i, out var session);
+			var audioProcess = Process.GetProcessById((int)session.ProcessID);
 
-			session.GetProcessId(out var sessionProcessId);
+			if (processes.Any(x => x.Id == session.ProcessID || x.ProcessName == audioProcess?.ProcessName))
-			var audioProcess = Process.GetProcessById(sessionProcessId);
-
-			if (processes.Any(x => x.Id == sessionProcessId || x.ProcessName == audioProcess?.ProcessName))
 			{
 				try
 				{
@@ -54,24 +36,31 @@ public class AudioHelper
 					{
 						displayName = audioProcess.ProcessName;
 					}
-					results.DisplayName = displayName;
+					matchingSession.DisplayName = displayName;
 				}
 				catch
 				{
-					results.DisplayName ??= audioProcess.ProcessName;
+					matchingSession.DisplayName ??= audioProcess.ProcessName;
 				}
 
-				results.ExecutablePath ??= audioProcess.MainModule.FileName;
+				matchingSession.ExecutablePath ??= audioProcess.MainModule.FileName;
 
 				//some apps like discord have multiple volume processes.
-				results.AddSession(session);
+				matchingSession.AddVolume(session.SimpleAudioVolume);
-
 			}
 		}
-
+		return matchingSession.Any() ? matchingSession : null;
-		return results.Any() ? results : null;
 	}
 
+	static object _lock = new object();
+
+	public void ResetCache()
+	{
+		lock(_lock)
+		{
+			_current = null;
+		}
+	}
 
 	public IAudioSession GetActiveSession(FallbackBehavior fallbackBehavior)
 	{
@@ -81,23 +70,23 @@ 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;
 		}
 	}
 
@@ -137,16 +126,6 @@ public class AudioHelper
 
 		try
 		{
-			//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
-			//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.
-			//And I'm not overly fond of programming in special cases
-			//so for the time being, the only down side i've found for including the parent process is that when you launch a game from steam and change the volume, you also change steam's volume. but that really only impacts videos on steam store pages
-			//The icon is also often steam's icon instead of the games'.
-			//But i'm striving for functional before perfection.
 			var blah = ParentProcessUtilities.GetParentProcess(pid);
 			if (blah != null && blah.ProcessName != "explorer" && blah.ProcessName != "svchost")
 			{
@@ -163,65 +142,47 @@ public class AudioHelper
 
 	public void ResetAll()
 	{
-		var deviceEnumerator = (CoreAudio)new MMDeviceEnumerator();
+		try
-
-		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++)
 		{
-			sessionEnumerator.GetSession(i, out var session);
+			var deviceEnumerator = new MMDeviceEnumerator(Guid.NewGuid());
 
-			var volume = (ISimpleAudioVolume)session;
+			using var device = deviceEnumerator.GetDefaultAudioEndpoint(DataFlow.Render, Role.Multimedia);
-			var guid = Guid.Empty;
+			using var manager = device.AudioSessionManager2;
-			volume.SetMasterVolume(1, ref guid);
+
-			volume.SetMute(false, ref guid);
+			foreach (var session in manager.Sessions)
+			{
+				session.SimpleAudioVolume.MasterVolume = 1;
+				session.SimpleAudioVolume.Mute = false;
 			}
 		}
+		catch { }
+	}
 
 	public IAudioSession GetSystemSounds()
 	{
-		var deviceEnumerator = (CoreAudio)new MMDeviceEnumerator();
+		var deviceEnumerator = new MMDeviceEnumerator(Guid.NewGuid());
 
-		deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia, out var device);
+		using var device = deviceEnumerator.GetDefaultAudioEndpoint(DataFlow.Render, Role.Multimedia);
+		using var manager = device.AudioSessionManager2;
 
-		Guid iid = typeof(IAudioSessionManager2).GUID;
+		var sessions = manager.Sessions;
-		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++)
 		{
-			sessionEnumerator.GetSession(i, out var session);
+			if (session.IsSystemSoundsSession)
-
-			if (session.IsSystemSoundsSession() == 0)
 			{
-				return new SystemSoundsAudioSession(session);
+				return new SystemSoundsAudioSession(session.SimpleAudioVolume);
 			}
 		}
+
 		return null;
 	}
 	public IAudioSession GetSystemVolume()
 	{
-		var deviceEnumerator = (CoreAudio)new MMDeviceEnumerator();
+		var deviceEnumerator = new MMDeviceEnumerator(Guid.NewGuid());
 
-		deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia, out var device);
+		using var device = deviceEnumerator.GetDefaultAudioEndpoint(DataFlow.Render, Role.Multimedia);
-
+		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

@@ -1,18 +1,17 @@
-using System;
+using CoreAudio;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using BarRaider.SdTools;
 using System.Drawing;
-using System.Runtime.InteropServices;
 
 namespace FocusVolumeControl.AudioSessions;
 
-public sealed class ActiveAudioSessionWrapper : IAudioSession
+public class ActiveAudioSessionWrapper : IAudioSession
 {
 	public string DisplayName { get; set; }
 	public string ExecutablePath { get; set; }
-	private List<IAudioSessionControl2> Sessions { get; } = new List<IAudioSessionControl2>();
+	private List<SimpleAudioVolume> Volume { get; } = new List<SimpleAudioVolume>();
-	private IEnumerable<ISimpleAudioVolume> Volume => Sessions.Cast<ISimpleAudioVolume>();
 
 	string _icon;
 
@@ -37,11 +36,11 @@ public sealed class ActiveAudioSessionWrapper : IAudioSession
 	{
 		return Volume.Any();
 	}
-	public int Count => Sessions.Count;
+	public int Count => Volume.Count;
 
-	public void AddSession(IAudioSessionControl2 session)
+	public void AddVolume(SimpleAudioVolume volume)
 	{
-		Sessions.Add(session);
+		Volume.Add(volume);
 	}
 
 	public void ToggleMute()
@@ -52,52 +51,28 @@ public sealed 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 = IsMuted();
+		var muted = Volume.All(x => x.Mute);
 
-		foreach(var v in Volume)
+		Volume.ForEach(x => x.Mute = !muted);
-		{
-			var guid = Guid.Empty;
-			v.SetMute(!muted, ref guid);
-		}
 	}
 
 	public bool IsMuted()
 	{
-		return Volume.All(x =>
+		return Volume.All(x => x.Mute);
-		{
-			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 volume = Volume.FirstOrDefault();
+		var level = Volume.FirstOrDefault()?.MasterVolume ?? 0;
-		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 volume = Volume.FirstOrDefault();
+		var level = Volume.FirstOrDefault()?.MasterVolume ?? 0;
-		var level = 0f;
-		if(volume != null)
-		{
-			volume.GetMasterVolume(out level);
-		}
-
 		return VolumeHelpers.GetVolumePercentage(level);
 	}
+
 }

src/FocusVolumeControl/AudioSessions/CoreAudio.cs

@@ -1,306 +0,0 @@
-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

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

src/FocusVolumeControl/AudioSessions/SystemSoundsAudioSession.cs

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

src/FocusVolumeControl/AudioSessions/SystemVolumeAudioSession.cs

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

src/FocusVolumeControl/DialAction.cs

@@ -35,6 +35,7 @@ public class DialAction : EncoderBase
 	IntPtr _foregroundWindowChangedEvent;
 	Native.WinEventDelegate _delegate;
 
+	IAudioSession _currentAudioSession;
 	AudioHelper _audioHelper = new AudioHelper();
 
 	Thread _thread;
@@ -47,7 +48,7 @@ public class DialAction : EncoderBase
 		if (payload.Settings == null || payload.Settings.Count == 0)
 		{
 			settings = PluginSettings.CreateDefaultSettings();
-			_ = SaveSettings();
+			SaveSettings();
 		}
 		else
 		{
@@ -68,8 +69,8 @@ public class DialAction : EncoderBase
 		_thread.SetApartmentState(ApartmentState.STA);
 		_thread.Start();
 
-		var session = _audioHelper.GetActiveSession(settings.FallbackBehavior);
+		_currentAudioSession = settings.FallbackBehavior == FallbackBehavior.SystemSounds ? _audioHelper.GetSystemSounds() : _audioHelper.GetSystemVolume();
-		_ = UpdateStateIfNeeded(session);
+		_ = UpdateStateIfNeeded();
 	}
 
 	public override void Dispose()
@@ -122,11 +123,10 @@ public class DialAction : EncoderBase
 		{
 			Logger.Instance.LogMessage(TracingLevel.INFO, "Dial Rotate");
 			//dial rotated. ticks positive for right, negative for left
-			var activeSession = _audioHelper.Current;
+			if (_currentAudioSession != null)
-			if (activeSession != null)
 			{
-				activeSession.IncrementVolumeLevel(settings.StepSize, payload.Ticks);
+				_currentAudioSession.IncrementVolumeLevel(settings.StepSize, payload.Ticks);
-				await UpdateStateIfNeeded(activeSession);
+				await UpdateStateIfNeeded();
 			}
 			else
 			{
@@ -159,11 +159,10 @@ public class DialAction : EncoderBase
 	{
 		try
 		{
-			var activeSession = _audioHelper.Current;
+			if (_currentAudioSession != null)
-			if (activeSession != null)
 			{
-				activeSession.ToggleMute();
+				_currentAudioSession.ToggleMute();
-				await UpdateStateIfNeeded(activeSession);
+				await UpdateStateIfNeeded();
 			}
 			else
 			{
@@ -185,7 +184,12 @@ 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);
 
-			await UpdateStateIfNeeded(activeSession);
+			if (activeSession != null)
+			{
+				_currentAudioSession = activeSession;
+			}
+
+			await UpdateStateIfNeeded();
 		}
 		catch (Exception ex)
 		{
@@ -194,14 +198,14 @@ public class DialAction : EncoderBase
 		}
 	}
 
-	private async Task UpdateStateIfNeeded(IAudioSession audioSession)
+	private async Task UpdateStateIfNeeded()
 	{
 		try
 		{
-			if (audioSession != null)
+			if (_currentAudioSession != null)
 			{
 
-				var uiState = new UIState(audioSession);
+				var uiState = new UIState(_currentAudioSession);
 
 				if (_previousState != null && uiState != null &&
 					uiState.Title == _previousState.Title &&
@@ -237,7 +241,7 @@ public class DialAction : EncoderBase
 		try
 		{
 			Tools.AutoPopulateSettings(settings, payload.Settings);
-			_ = SaveSettings();
+			SaveSettings();
 		}
 		catch (Exception ex)
 		{

src/FocusVolumeControl/FocusVolumeControl.csproj

@@ -56,7 +56,6 @@
   <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" />
@@ -93,6 +92,9 @@
     </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/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": "1.1.1",
+  "Version": "1.1.0",
   "CodePath": "FocusVolumeControl",
   "Category": "Volume Control [dlprows]",
   "Icon": "Images/pluginIcon",