gtksink: Avoid errors fetching widget property

Avoid errors when fetching the "widget" property and GTK initialisation
fails, such as when running in a non-graphical environment.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1088>

diff --git a/subprojects/gst-plugins-good/ext/gtk/gstgtkbasesink.c b/subprojects/gst-plugins-good/ext/gtk/gstgtkbasesink.c
index 2f4321e..73a9439 100644 (file)
--- a/subprojects/gst-plugins-good/ext/gtk/gstgtkbasesink.c
+++ b/subprojects/gst-plugins-good/ext/gtk/gstgtkbasesink.c
@@ -183,7 +183,7 @@ gst_gtk_base_sink_get_widget (GstGtkBaseSink * gtk_sink)
   /* Ensure GTK is initialized, this has no side effect if it was already
    * initialized. Also, we do that lazily, so the application can be first */
   if (!gtk_init_check (NULL, NULL)) {
-    GST_ERROR_OBJECT (gtk_sink, "Could not ensure GTK initialization.");
+    GST_INFO_OBJECT (gtk_sink, "Could not ensure GTK initialization.");
     return NULL;
   }
 
@@ -296,6 +296,11 @@ gst_gtk_base_sink_navigation_send_event (GstNavigation * navigation,
     GtkGstBaseWidget *widget = gst_gtk_base_sink_get_widget (sink);
     gdouble stream_x, stream_y;
 
+    if (widget == NULL) {
+      GST_ERROR_OBJECT (sink, "Could not ensure GTK initialization.");
+      return;
+    }
+
     gtk_gst_base_widget_display_size_to_stream_size (widget,
         x, y, &stream_x, &stream_y);
     gst_structure_set (structure,
@@ -333,8 +338,10 @@ gst_gtk_base_sink_start_on_main (GstBaseSink * bsink)
   GstGtkBaseSinkClass *klass = GST_GTK_BASE_SINK_GET_CLASS (bsink);
   GtkWidget *toplevel;
 
-  if (gst_gtk_base_sink_get_widget (gst_sink) == NULL)
+  if (gst_gtk_base_sink_get_widget (gst_sink) == NULL) {
+    GST_ERROR_OBJECT (bsink, "Could not ensure GTK initialization.");
     return FALSE;
+  }
 
   /* After this point, gtk_sink->widget will always be set */
 

diff --git a/subprojects/gst-plugins-good/ext/gtk/gstgtkglsink.c b/subprojects/gst-plugins-good/ext/gtk/gstgtkglsink.c
index 12ea706..8c66053 100644 (file)
--- a/subprojects/gst-plugins-good/ext/gtk/gstgtkglsink.c
+++ b/subprojects/gst-plugins-good/ext/gtk/gstgtkglsink.c
@@ -139,9 +139,11 @@ gst_gtk_gl_sink_set_property (GObject * object, guint prop_id,
     {
       GtkWidget *widget =
           gst_gtk_base_sink_acquire_widget (GST_GTK_BASE_SINK (object));
-      gtk_gst_gl_widget_set_rotate_method (GTK_GST_GL_WIDGET (widget),
-          g_value_get_enum (value), FALSE);
-      g_object_unref (widget);
+      if (widget != NULL) {
+        gtk_gst_gl_widget_set_rotate_method (GTK_GST_GL_WIDGET (widget),
+            g_value_get_enum (value), FALSE);
+        g_object_unref (widget);
+      }
       break;
     }
     default:
@@ -161,9 +163,13 @@ gst_gtk_gl_sink_get_property (GObject * object, guint prop_id,
       GtkWidget *widget =
           gst_gtk_base_sink_acquire_widget (GST_GTK_BASE_SINK (object));
 
-      g_value_set_enum (value,
-          gtk_gst_gl_widget_get_rotate_method (GTK_GST_GL_WIDGET (widget)));
-      g_object_unref (widget);
+      if (widget != NULL) {
+        g_value_set_enum (value,
+            gtk_gst_gl_widget_get_rotate_method (GTK_GST_GL_WIDGET (widget)));
+        g_object_unref (widget);
+      } else {
+        g_value_set_enum (value, GST_VIDEO_ORIENTATION_IDENTITY);
+      }
 
       break;
     }
@@ -460,6 +466,10 @@ gst_gtk_gl_sink_event (GstBaseSink * sink, GstEvent * event)
 
         widget = GTK_GST_GL_WIDGET
             (gst_gtk_base_sink_acquire_widget (GST_GTK_BASE_SINK (sink)));
+        if (widget == NULL) {
+          GST_ERROR_OBJECT (sink, "Could not ensure GTK initialization.");
+          break;
+        }
 
         gtk_gst_gl_widget_set_rotate_method (widget, orientation, TRUE);