feat: Add media foundation backend

FlashCap.Core/CaptureDeviceDescriptor.cs

@@ -23,6 +23,7 @@ public enum DeviceTypes
     DirectShow,
     V4L2,
     AVFoundation,
+    MediaFoundation,
 }
 
 public enum TranscodeFormats

FlashCap.Core/CaptureDevices.cs

@@ -14,10 +14,19 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Runtime.CompilerServices;
 
 namespace FlashCap;
 
+/// <summary>
+/// By default, the following backends are considered for <see cref="OnEnumerateDescriptors"/>:
+/// <list type= "bullet">
+/// <item><description><see cref="DirectShowDevices"/> (windows)- Only if <c>RuntimeFeature.IsDynamicCodeSupported</c> is true</description></item>
+/// <item><description><see cref="VideoForWindowsDevices"/> (windows)</description></item>
+/// <item><description><c>MediaFoundationDevices</c> (windows6.0 or greater) - Supported on net48, netstandard2.0 or greater, .NET 5.0 or greater</description></item>
+/// <item><description><see cref="V4L2Devices"/> (linux)</description></item>
+/// <item><description><see cref="AVFoundationDevices"/> (macOs)</description></item>
+/// </list>
+/// </summary>
 public class CaptureDevices
 {
     protected readonly BufferPool DefaultBufferPool;
@@ -26,23 +35,37 @@ public CaptureDevices() :
         this(new DefaultBufferPool())
     {
     }
-
-    public CaptureDevices(BufferPool defaultBufferPool) =>
-        this.DefaultBufferPool = defaultBufferPool;
 
-    protected virtual IEnumerable<CaptureDeviceDescriptor> OnEnumerateDescriptors() =>
-        NativeMethods.CurrentPlatform switch
+    public CaptureDevices(BufferPool defaultBufferPool)
+    {
+        DefaultBufferPool = defaultBufferPool;
+    }
+
+    protected virtual IEnumerable<CaptureDeviceDescriptor> OnEnumerateDescriptors()
+    {
+        switch (NativeMethods.CurrentPlatform)
         {
-            NativeMethods.Platforms.Windows =>
-                new DirectShowDevices(this.DefaultBufferPool).OnEnumerateDescriptors().
-                Concat(new VideoForWindowsDevices(this.DefaultBufferPool).OnEnumerateDescriptors()),
-            NativeMethods.Platforms.Linux =>
-                new V4L2Devices().OnEnumerateDescriptors(),
-            NativeMethods.Platforms.MacOS =>
-                new AVFoundationDevices().OnEnumerateDescriptors(),
-            _ =>
-                ArrayEx.Empty<CaptureDeviceDescriptor>(),
-        };
+            case NativeMethods.Platforms.Windows:
+            {
+                IEnumerable<CaptureDeviceDescriptor> descriptors = [];
+#if NETSTANDARD2_1 || NETCOREAPP3_0_OR_GREATER
+                if (RuntimeFeature.IsDynamicCodeSupported)
+#endif
+                    descriptors = new DirectShowDevices(this.DefaultBufferPool).OnEnumerateDescriptors();
+                descriptors = descriptors.Concat(new VideoForWindowsDevices(this.DefaultBufferPool).OnEnumerateDescriptors());
+#if FLASHCAP_MEDIAFOUNDATION
+                descriptors = descriptors.Concat(new MediaFoundationDevices(this.DefaultBufferPool).OnEnumerateDescriptors());
+#endif
+                return descriptors;
+            }
+            case NativeMethods.Platforms.Linux:
+                return new V4L2Devices().OnEnumerateDescriptors();
+            case NativeMethods.Platforms.MacOS:
+                return new AVFoundationDevices().OnEnumerateDescriptors();
+            default:
+                return ArrayEx.Empty<CaptureDeviceDescriptor>();
+        }
+    }
 
     internal IEnumerable<CaptureDeviceDescriptor> InternalEnumerateDescriptors() =>
         this.OnEnumerateDescriptors();

FlashCap.Core/Devices/DirectShowDevice.cs

@@ -10,6 +10,7 @@
 using FlashCap.Internal;
 using System;
 using System.Diagnostics;
+using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
@@ -18,6 +19,7 @@
 
 namespace FlashCap.Devices;
 
+[RequiresDynamicCode("Direct show depends on COM runtime generation and requires dynamic code")]
 public sealed class DirectShowDevice :
     CaptureDevice
 {

FlashCap.Core/Devices/DirectShowDeviceDescriptor.cs

@@ -7,11 +7,13 @@
 //
 ////////////////////////////////////////////////////////////////////////////
 
+using System.Diagnostics.CodeAnalysis;
 using System.Threading;
 using System.Threading.Tasks;
 
 namespace FlashCap.Devices;
 
+[RequiresDynamicCode("Direct show depends on COM runtime generation and requires dynamic code")]
 public sealed class DirectShowDeviceDescriptor : CaptureDeviceDescriptor
 {
     private readonly string devicePath;

FlashCap.Core/Devices/DirectShowDevices.cs

@@ -10,10 +10,12 @@
 using FlashCap.Internal;
 using System;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 
 namespace FlashCap.Devices;
 
+[RequiresDynamicCode("Direct show depends on COM runtime generation and requires dynamic code")]
 public sealed class DirectShowDevices : CaptureDevices
 {
     public DirectShowDevices() :