element/deviceprovider: Add instance getter functions for class properties

That is, the metadata and pad templates. Using instance getters is
easier to deal with for bindings, especially autogenerated ones.

docs/gst/gstreamer-sections.txt

@@ -896,6 +896,7 @@ gst_element_link_filtered
 
 <SUBSECTION element-properties>
 gst_element_class_get_metadata
+gst_element_get_metadata
 gst_element_set_base_time
 gst_element_get_base_time
 gst_element_set_start_time
@@ -911,6 +912,8 @@ gst_element_set_name
 gst_element_get_name
 gst_element_set_parent
 gst_element_get_parent
+gst_element_get_pad_template
+gst_element_get_pad_template_list
 
 <SUBSECTION element-clocks>
 gst_element_set_clock
@@ -3824,6 +3827,7 @@ gst_device_provider_device_remove
 gst_device_provider_get_bus
 gst_device_provider_get_devices
 gst_device_provider_get_factory
+gst_device_provider_get_metadata
 gst_device_provider_register
 gst_device_provider_start
 gst_device_provider_stop

gst/gstdeviceprovider.c

@@ -351,6 +351,29 @@ gst_device_provider_class_get_metadata (GstDeviceProviderClass * klass,
   return gst_structure_get_string ((GstStructure *) klass->metadata, key);
 }
 
+/**
+ * gst_device_provider_get_metadata:
+ * @provider: provider to get metadata for
+ * @key: the key to get
+ *
+ * Get metadata with @key in @provider.
+ *
+ * Returns: the metadata for @key.
+ *
+ * Since: 1.14
+ */
+const gchar *
+gst_device_provider_get_metadata (GstDeviceProvider * provider,
+    const gchar * key)
+{
+  g_return_val_if_fail (GST_IS_DEVICE_PROVIDER (provider), NULL);
+  g_return_val_if_fail (key != NULL, NULL);
+
+  return
+      gst_device_provider_class_get_metadata (GST_DEVICE_PROVIDER_GET_CLASS
+      (provider), key);
+}
+
 /**
  * gst_device_provider_get_devices:
  * @provider: A #GstDeviceProvider

gst/gstdeviceprovider.h

@@ -134,6 +134,9 @@ GST_EXPORT
 void        gst_device_provider_unhide_provider      (GstDeviceProvider * provider,
                                                       const gchar       * name);
 
+GST_EXPORT
+const gchar * gst_device_provider_get_metadata       (GstDeviceProvider * provider,
+                                                      const gchar * key);
 
 /* device provider class meta data */
 

gst/gstelement.c

@@ -1461,6 +1461,26 @@ gst_element_class_get_metadata (GstElementClass * klass, const gchar * key)
   return gst_structure_get_string ((GstStructure *) klass->metadata, key);
 }
 
+/**
+ * gst_element_get_metadata:
+ * @element: class to get metadata for
+ * @key: the key to get
+ *
+ * Get metadata with @key in @klass.
+ *
+ * Returns: the metadata for @key.
+ *
+ * Since: 1.14
+ */
+const gchar *
+gst_element_get_metadata (GstElement * element, const gchar * key)
+{
+  g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
+  g_return_val_if_fail (key != NULL, NULL);
+
+  return gst_element_class_get_metadata (GST_ELEMENT_GET_CLASS (element), key);
+}
+
 /**
  * gst_element_class_get_pad_template_list:
  * @element_class: a #GstElementClass to get pad templates of.
@@ -1482,6 +1502,27 @@ gst_element_class_get_pad_template_list (GstElementClass * element_class)
   return element_class->padtemplates;
 }
 
+/**
+ * gst_element_get_pad_template_list:
+ * @element: a #GstElement to get pad templates of.
+ *
+ * Retrieves a list of the pad templates associated with @element. The
+ * list must not be modified by the calling code.
+ *
+ * Returns: (transfer none) (element-type Gst.PadTemplate): the #GList of
+ *     pad templates.
+ *
+ * Since: 1.14
+ */
+GList *
+gst_element_get_pad_template_list (GstElement * element)
+{
+  g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
+
+  return
+      gst_element_class_get_pad_template_list (GST_ELEMENT_GET_CLASS (element));
+}
+
 /**
  * gst_element_class_get_pad_template:
  * @element_class: a #GstElementClass to get the pad template of.
@@ -1519,6 +1560,29 @@ gst_element_class_get_pad_template (GstElementClass *
   return NULL;
 }
 
+/**
+ * gst_element_get_pad_template:
+ * @element: a #GstElement to get the pad template of.
+ * @name: the name of the #GstPadTemplate to get.
+ *
+ * Retrieves a padtemplate from @element with the given name.
+ *
+ * Returns: (transfer none) (nullable): the #GstPadTemplate with the
+ *     given name, or %NULL if none was found. No unreferencing is
+ *     necessary.
+ *
+ * Since: 1.14
+ */
+GstPadTemplate *
+gst_element_get_pad_template (GstElement * element, const gchar * name)
+{
+  g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
+  g_return_val_if_fail (name != NULL, NULL);
+
+  return gst_element_class_get_pad_template (GST_ELEMENT_GET_CLASS (element),
+      name);
+}
+
 static GstPadTemplate *
 gst_element_class_get_request_pad_template (GstElementClass *
     element_class, const gchar * name)

gst/gstelement.h

@@ -1008,6 +1008,14 @@ GST_EXPORT
 void                    gst_element_remove_property_notify_watch (GstElement * element,
                                                                   gulong       watch_id);
 
+GST_EXPORT
+GstPadTemplate*         gst_element_get_pad_template           (GstElement *element, const gchar *name);
+
+GST_EXPORT
+GList*                  gst_element_get_pad_template_list      (GstElement *element);
+GST_EXPORT
+const gchar *           gst_element_get_metadata               (GstElement * element, const gchar * key);
+
 #ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstElement, gst_object_unref)
 #endif

win32/common/libgstreamer.def

@@ -479,6 +479,7 @@ EXPORTS
 	gst_device_provider_get_devices
 	gst_device_provider_get_factory
 	gst_device_provider_get_hidden_providers
+	gst_device_provider_get_metadata
 	gst_device_provider_get_type
 	gst_device_provider_hide_provider
 	gst_device_provider_register
@@ -536,6 +537,9 @@ EXPORTS
 	gst_element_get_context_unlocked
 	gst_element_get_contexts
 	gst_element_get_factory
+	gst_element_get_metadata
+	gst_element_get_pad_template
+	gst_element_get_pad_template_list
 	gst_element_get_request_pad
 	gst_element_get_start_time
 	gst_element_get_state