added a comment to remind myself about why steam games do funny things

src/FocusVolumeControl/AudioHelper.cs

@@ -1,33 +1,51 @@
-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 Current { get; private set; }
+
+	public void ResetCache()
+	{
+		lock (_lock)
+		{
+			Current = null;
+		}
+	}
+
 	public IAudioSession FindSession(List<Process> processes)
 	{
-		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;
 
-		var matchingSession = new ActiveAudioSessionWrapper();
 
-		foreach (var session in sessions)
+		manager.GetSessionEnumerator(out var sessionEnumerator);
+
+		var results = new ActiveAudioSessionWrapper();
+
+		sessionEnumerator.GetCount(out var count);
+		for (int i = 0; i < count; i++)
 		{
-			var audioProcess = Process.GetProcessById((int)session.ProcessID);
+			sessionEnumerator.GetSession(i, out var session);
 
-			if (processes.Any(x => x.Id == session.ProcessID || x.ProcessName == audioProcess?.ProcessName))
+			session.GetProcessId(out var sessionProcessId);
+			var audioProcess = Process.GetProcessById(sessionProcessId);
+
+			if (processes.Any(x => x.Id == sessionProcessId || x.ProcessName == audioProcess?.ProcessName))
 			{
 				try
 				{
@@ -36,31 +54,24 @@ public class AudioHelper
 					{
 						displayName = audioProcess.ProcessName;
 					}
-					matchingSession.DisplayName = displayName;
+					results.DisplayName = displayName;
 				}
 				catch
 				{
-					matchingSession.DisplayName ??= audioProcess.ProcessName;
+					results.DisplayName ??= audioProcess.ProcessName;
 				}
 
-				matchingSession.ExecutablePath ??= audioProcess.MainModule.FileName;
+				results.ExecutablePath ??= audioProcess.MainModule.FileName;
 
 				//some apps like discord have multiple volume processes.
-				matchingSession.AddVolume(session.SimpleAudioVolume);
+				results.AddSession(session);
+
 			}
 		}
-		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)
 	{
@@ -70,23 +81,23 @@ 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;
 		}
 	}
 
@@ -126,6 +137,16 @@ 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")
 			{
@@ -142,47 +163,65 @@ 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/DialAction.cs

@@ -35,7 +35,6 @@ public class DialAction : EncoderBase
 	IntPtr _foregroundWindowChangedEvent;
 	Native.WinEventDelegate _delegate;
 
-	IAudioSession _currentAudioSession;
 	AudioHelper _audioHelper = new AudioHelper();
 
 	Thread _thread;
@@ -48,7 +47,7 @@ public class DialAction : EncoderBase
 		if (payload.Settings == null || payload.Settings.Count == 0)
 		{
 			settings = PluginSettings.CreateDefaultSettings();
-			SaveSettings();
+			_ = SaveSettings();
 		}
 		else
 		{
@@ -69,8 +68,8 @@ public class DialAction : EncoderBase
 		_thread.SetApartmentState(ApartmentState.STA);
 		_thread.Start();
 
-		_currentAudioSession = settings.FallbackBehavior == FallbackBehavior.SystemSounds ? _audioHelper.GetSystemSounds() : _audioHelper.GetSystemVolume();
+		var session = _audioHelper.GetActiveSession(settings.FallbackBehavior);
-		_ = UpdateStateIfNeeded();
+		_ = UpdateStateIfNeeded(session);
 	}
 
 	public override void Dispose()
@@ -123,10 +122,11 @@ public class DialAction : EncoderBase
 		{
 			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 +159,11 @@ 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 +185,7 @@ 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 +194,14 @@ 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 +237,7 @@ public class DialAction : EncoderBase
 		try
 		{
 			Tools.AutoPopulateSettings(settings, payload.Settings);
-			SaveSettings();
+			_ = SaveSettings();
 		}
 		catch (Exception 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" />
@@ -92,9 +93,6 @@
     </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/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": "1.1.1",
   "CodePath": "FocusVolumeControl",
   "Category": "Volume Control [dlprows]",
   "Icon": "Images/pluginIcon",