plugin: enable direct upload if raw video

Enable the direct upload with linear surfaces if the negotiated sink caps are
video/x-raw without features.

gst/vaapi/gstvaapipluginbase.c

@@ -529,9 +529,19 @@ ensure_sinkpad_allocator (GstVaapiPluginBase * plugin, GstVideoInfo * vinfo)
         gst_vaapi_dmabuf_allocator_new (plugin->display, vinfo,
         GST_VAAPI_SURFACE_ALLOC_FLAG_LINEAR_STORAGE);
   } else {
+    GstVaapiImageUsageFlags usage_flag =
+        GST_VAAPI_IMAGE_USAGE_FLAG_NATIVE_FORMATS;
+    guint alloc_flag = 0;
+
+    if (gst_caps_is_video_raw (plugin->sinkpad_caps)) {
+      usage_flag = GST_VAAPI_IMAGE_USAGE_FLAG_DIRECT_UPLOAD;
+      alloc_flag = GST_VAAPI_SURFACE_ALLOC_FLAG_LINEAR_STORAGE;
+      GST_INFO_OBJECT (plugin, "enabling direct upload in sink allocator");
+    }
+
     plugin->sinkpad_allocator =
-        gst_vaapi_video_allocator_new (plugin->display, vinfo, 0,
-        GST_VAAPI_IMAGE_USAGE_FLAG_NATIVE_FORMATS);
+        gst_vaapi_video_allocator_new (plugin->display, vinfo, alloc_flag,
+        usage_flag);
   }
   return plugin->sinkpad_allocator != NULL;
 }