Add project files.

Media/Capture/MediaFrameSource.cs

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+using AForge.Video.DirectShow;
+
+namespace TheXamlGuy.Media.Capture;
+
+public class MediaFrameSource : IMediaFrameSource
+{
+    public List<MediaFrameFormat> supportedFormats = new();
+    private MediaFrameFormat? currentFormat = null;
+
+    internal MediaFrameSource(string id, string displayName)
+    {
+        Info = new MediaFrameSourceInfo(id);
+        DisplayName = displayName;
+
+        InitializeSupportedFormats(id);
+    }
+
+    public MediaFrameFormat CurrentFormat => currentFormat ?? supportedFormats.FirstOrDefault()!;
+
+    public string DisplayName { get; }
+
+    public MediaFrameSourceInfo Info { get; }
+
+    public IReadOnlyList<MediaFrameFormat> SupportedFormats => supportedFormats;
+
+    public static async Task<IReadOnlyList<IMediaFrameSource>> FindAllAsync()
+    {
+        List<IMediaFrameSource> result = new();
+        foreach (FilterInfo videoInputDevice in new FilterInfoCollection(FilterCategory.VideoInputDevice))
+        {
+            result.Add(new MediaFrameSource(videoInputDevice.MonikerString, videoInputDevice.Name));
+        }
+
+        return await Task.FromResult(result);
+    }
+
+    public void SetFormat(MediaFrameFormat format)
+    {
+        currentFormat = format;
+    }
+
+    private void InitializeSupportedFormats(string id)
+    {
+        VideoCaptureDevice videoCaptureDevice = new(id);
+        foreach (VideoCapabilities videoCapabilities in videoCaptureDevice.VideoCapabilities)
+        {
+            supportedFormats.Add(new MediaFrameFormat 
+            { 
+                Size = videoCapabilities.FrameSize, 
+                FrameRate = videoCapabilities.AverageFrameRate 
+            });
+        }
+    }
+}