feat(win/video): support native YUV 4:4:4 encoding (#2533)

src/nvenc/nvenc_d3d11_native.h

@@ -0,0 +1,38 @@
+/**
+ * @file src/nvenc/nvenc_d3d11_native.h
+ * @brief Declarations for native Direct3D11 NVENC encoder.
+ */
+#pragma once
+#ifdef _WIN32
+
+  #include <comdef.h>
+  #include <d3d11.h>
+
+  #include "nvenc_d3d11.h"
+
+namespace nvenc {
+
+  /**
+   * @brief Native Direct3D11 NVENC encoder.
+   */
+  class nvenc_d3d11_native final: public nvenc_d3d11 {
+  public:
+    /**
+     * @param d3d_device Direct3D11 device used for encoding.
+     */
+    explicit nvenc_d3d11_native(ID3D11Device *d3d_device);
+    ~nvenc_d3d11_native();
+
+    ID3D11Texture2D *
+    get_input_texture() override;
+
+  private:
+    bool
+    create_and_register_input_buffer() override;
+
+    const ID3D11DevicePtr d3d_device;
+    ID3D11Texture2DPtr d3d_input_texture;
+  };
+
+}  // namespace nvenc
+#endif