refactor: 重构 IMediaVideo 接口

Author: ArgoZhang

src/BootstrapBlazor/Services/MediaDevices/DefaultMediaVideo.cs

@@ -27,13 +27,28 @@ public Task Open(MediaTrackConstraints constraints)
         return deviceService.Open(constraints);
     }
 
-    public Task Close(string selector)
+    public Task Close()
     {
         return deviceService.Close(selector);
     }
 
-    public Task Capture(string selector)
+    public Task Capture()
     {
         return deviceService.Capture(selector);
     }
+
+    public Task Preview()
+    {
+        throw new NotImplementedException();
+    }
+
+    public Task<Stream?> GetPreviewImage()
+    {
+        throw new NotImplementedException();
+    }
+
+    public Task<string?> GetPreviewUrl()
+    {
+        throw new NotImplementedException();
+    }
 }

src/BootstrapBlazor/Services/MediaDevices/IMediaVideo.cs

@@ -6,34 +6,50 @@
 namespace BootstrapBlazor.Components;
 
 /// <summary>
-/// 
+/// Video Media Device Interface
 /// </summary>
 public interface IMediaVideo
 {
     /// <summary>
-    /// 
+    /// Gets the list of video devices.
     /// </summary>
     /// <returns></returns>
     Task<List<IMediaDeviceInfo>?> GetDevices();
 
     /// <summary>
-    /// 
+    /// Opens the video device with the specified constraints.
     /// </summary>
     /// <param name="constraints"></param>
     /// <returns></returns>
     Task Open(MediaTrackConstraints constraints);
 
     /// <summary>
-    /// 
+    /// Close the video device with the specified selector.
     /// </summary>
-    /// <param name="selector"></param>
     /// <returns></returns>
-    Task Close(string selector);
+    Task Close();
 
     /// <summary>
-    /// 
+    /// Capture a still image from the video stream.
     /// </summary>
-    /// <param name="selector"></param>
     /// <returns></returns>
-    Task Capture(string selector);
+    Task Capture();
+
+    /// <summary>
+    /// Preview a still image from the video stream.
+    /// </summary>
+    /// <returns></returns>
+    Task Preview();
+
+    /// <summary>
+    /// Gets the stream of the captured image.
+    /// </summary>
+    /// <returns></returns>
+    Task<Stream?> GetPreviewImage();
+
+    /// <summary>
+    /// Gets the preview URL of the captured image.
+    /// </summary>
+    /// <returns></returns>
+    Task<string?> GetPreviewUrl();
 }