Merge pull request #168 from XScorpion2/set_default_device_api

Implemented IPolicyConfig interface for set default device

Desktop/Application/MaxMix/MaxMix.csproj

@@ -146,6 +146,7 @@
     <Compile Include="Services\Communication\Message\MessageRemoveSession.cs" />
     <Compile Include="Services\Communication\Message\MessageSettings.cs" />
     <Compile Include="Services\Communication\Message\MessageUpdateVolumeSession.cs" />
+    <Compile Include="Services\Audio\PolicyConfig.cs" />
     <Compile Include="ViewModels\BaseViewModel.cs" />
     <Compile Include="ViewModels\MainViewModel.cs" />
     <Compile Include="ViewModels\SettingsViewModel.cs" />

Desktop/Application/MaxMix/Services/Audio/AudioExtensions.cs

@@ -1,4 +1,5 @@
-using System;
+using CSCore.CoreAudioAPI;
+using System;
 using System.Diagnostics;
 using System.Runtime.InteropServices;
 using System.Text;
@@ -33,5 +34,11 @@ public static string GetProductName(this Process process)
             var versionInfo = FileVersionInfo.GetVersionInfo(fileName);
             return versionInfo.ProductName;
         }
+
+        public static void SetDefaultEndpoint(string deviceID, Role role)
+        {
+            var policyConfig = new PolicyConfig();
+            policyConfig.SetDefaultEndpoint(deviceID, role);
+        }
     }
 }

Desktop/Application/MaxMix/Services/Audio/PolicyConfig.cs

@@ -0,0 +1,55 @@
+using CSCore.CoreAudioAPI;
+using CSCore.Win32;
+using System;
+using System.Runtime.InteropServices;
+
+namespace MaxMix.Services.Audio
+{
+    [Guid("8F9FB2AA-1C0B-4D54-B6BB-B2F2A10CE03C")]
+    class PolicyConfig : ComObject
+    {
+        public PolicyConfig() : base(CreatePolicyConfig()) { }
+
+        private static IntPtr CreatePolicyConfig()
+        {
+            var obj = new PolicyConfigObject();
+            if (obj is IPolicyConfig c)
+                return Marshal.GetComInterfaceForObject(c, typeof(IPolicyConfig));
+            throw new NotSupportedException("Unable to create PolicyConfig on this OS.");
+        }
+
+        public void SetDefaultEndpoint(string id, Role role)
+        {
+            var obj = Marshal.GetObjectForIUnknown(BasePtr);
+            int result = unchecked((int)0x80090011); // Object not found error
+            if (obj is IPolicyConfig c)
+                result = c.SetDefaultEndpoint(id, role);
+            Marshal.ThrowExceptionForHR(result);
+        }
+
+        [ComImport]
+        [Guid("870AF99C-171D-4F9E-AF0D-E63DF40C2BC9")]
+        private class PolicyConfigObject
+        {
+        }
+    }
+
+    [ComImport]
+    [Guid("F8679F50-850A-41CF-9C72-430F290290C8")]
+    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+    interface IPolicyConfig : IUnknown
+    {
+        void Unused1();
+        void Unused2();
+        void Unused3();
+        void Unused4();
+        void Unused5();
+        void Unused6();
+        void Unused7();
+        void Unused8();
+        void Unused9();
+        void Unused10();
+        int SetDefaultEndpoint([In, MarshalAs(UnmanagedType.LPWStr)] string id, Role role);
+        void Unused12();
+    }
+}