clapper-gtk: video: Fix checks when inhibiting session

Sometimes property might return a subclass type when object is subclassed.
This especially happens with custom GdkPaintable implementations.
For this reason instead of comparing object type, check if it inherits what we want.

src/lib/clapper-gtk/clapper-gtk-video.c

@@ -909,7 +909,7 @@ _set_inhibit_session (ClapperGtkVideo *self, gboolean inhibit)
 
   root = gtk_widget_get_root (GTK_WIDGET (self));
 
-  if (!root && !GTK_IS_WINDOW (root)) {
+  if (!root || !GTK_IS_WINDOW (root)) {
     GST_WARNING_OBJECT (self, "Cannot %sinhibit session "
         "without root window", (inhibit) ? "" : "un");
     return;
@@ -919,7 +919,7 @@ _set_inhibit_session (ClapperGtkVideo *self, gboolean inhibit)
    * as it goes away early when unrooting */
   app = g_application_get_default ();
 
-  if (!app && !GTK_IS_APPLICATION (app)) {
+  if (!app || !GTK_IS_APPLICATION (app)) {
     GST_WARNING_OBJECT (self, "Cannot %sinhibit session "
         "without window application set", (inhibit) ? "" : "un");
     return;
@@ -977,20 +977,24 @@ _get_widget_from_video_sink (GstElement *vsink)
   GParamSpec *pspec;
 
   if ((pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (vsink), "widget"))
-      && pspec->value_type == GTK_TYPE_WIDGET) {
+      && g_type_is_a (pspec->value_type, GTK_TYPE_WIDGET)) {
     GST_DEBUG ("Video sink provides a widget");
     g_object_get (vsink, "widget", &widget, NULL);
   } else if ((pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (vsink), "paintable"))
-      && pspec->value_type == GDK_TYPE_PAINTABLE) {
-    GdkPaintable *paintable = NULL;
+      && g_type_is_a (pspec->value_type, G_TYPE_OBJECT)) {
+    GObject *paintable = NULL;
 
     GST_DEBUG ("Video sink provides a paintable");
     g_object_get (vsink, "paintable", &paintable, NULL);
 
-    widget = g_object_ref_sink (gtk_picture_new ());
-    gtk_picture_set_paintable (GTK_PICTURE (widget), paintable);
+    if (G_LIKELY (paintable != NULL)) {
+      if (GDK_IS_PAINTABLE (paintable)) {
+        widget = g_object_ref_sink (gtk_picture_new ());
+        gtk_picture_set_paintable (GTK_PICTURE (widget), GDK_PAINTABLE (paintable));
+      }
 
-    g_object_unref (paintable);
+      g_object_unref (paintable);
+    }
   }
 
   return widget;

src/lib/clapper/features/server/clapper-server-mdns.c

@@ -18,6 +18,7 @@
  */
 
 #include <gst/gst.h>
+#include <sys/socket.h>
 
 #include "clapper-server-mdns-private.h"