introspection: add some missing allow-none annotations to in params

https://bugzilla.gnome.org/show_bug.cgi?id=730957

gst/gstbufferpool.c

@@ -823,8 +823,8 @@ gst_buffer_pool_config_set_params (GstStructure * config, GstCaps * caps,
 /**
  * gst_buffer_pool_config_set_allocator:
  * @config: a #GstBufferPool configuration
- * @allocator: a #GstAllocator
- * @params: #GstAllocationParams
+ * @allocator: (allow-none): a #GstAllocator
+ * @params: (allow-none): #GstAllocationParams
  *
  * Set the @allocator and @params on @config.
  *

gst/gstelement.c

@@ -1731,7 +1731,7 @@ gst_element_post_message (GstElement * element, GstMessage * message)
 
 /**
  * _gst_element_error_printf:
- * @format: the printf-like format to use, or %NULL
+ * @format: (allow-none): the printf-like format to use, or %NULL
  *
  * This function is only used internally by the gst_element_error() macro.
  *

gst/gstinfo.h

@@ -197,7 +197,7 @@ struct _GstDebugCategory {
 
 /**
  * GST_STR_NULL:
- * @str: The string to check.
+ * @str: (allow-none): The string to check.
  *
  * Macro to use when a string must not be %NULL, but may be %NULL. If the string
  * is %NULL, "(NULL)" is printed instead.

gst/gstmessage.c

@@ -256,8 +256,8 @@ gst_message_init (GstMessageImpl * message, GstMessageType type,
  * gst_message_new_custom:
  * @type: The #GstMessageType to distinguish messages
  * @src: The object originating the message.
- * @structure: (transfer full): the structure for the message. The message
- *     will take ownership of the structure.
+ * @structure: (transfer full) (allow-none): the structure for the
+ *     message. The message will take ownership of the structure.
  *
  * Create a new custom-typed message. This can be used for anything not
  * handled by other message-specific functions to pass a message to the
@@ -785,8 +785,8 @@ gst_message_new_application (GstObject * src, GstStructure * structure)
 /**
  * gst_message_new_element:
  * @src: (transfer none): The object originating the message.
- * @structure: (transfer full): The structure for the message. The message
- *     will take ownership of the structure.
+ * @structure: (transfer full): The structure for the
+ *     message. The message will take ownership of the structure.
  *
  * Create a new element-specific message. This is meant as a generic way of
  * allowing one-way communication from an element to an application, for example

gst/gstobject.c

@@ -312,7 +312,7 @@ gst_object_ref_sink (gpointer object)
  * gst_object_replace:
  * @oldobj: (inout) (transfer full) (nullable): pointer to a place of
  *     a #GstObject to replace
- * @newobj: (transfer none): a new #GstObject
+ * @newobj: (transfer none) (allow-none): a new #GstObject
  *
  * Atomically modifies a pointer to point to a new object.
  * The reference count of @oldobj is decreased and the reference count of
@@ -588,7 +588,7 @@ had_parent:
 /**
  * gst_object_set_name:
  * @object: a #GstObject
- * @name:   new name of object
+ * @name: (allow-none): new name of object
  *
  * Sets the name of @object, or gives @object a guaranteed unique
  * name (if @name is %NULL).

gst/gstpad.c

@@ -766,7 +766,7 @@ gst_pad_get_property (GObject * object, guint prop_id,
 
 /**
  * gst_pad_new:
- * @name: the name of the new pad.
+ * @name: (allow-none): the name of the new pad.
  * @direction: the #GstPadDirection of the pad.
  *
  * Creates a new pad with the given name in the given direction.
@@ -789,7 +789,7 @@ gst_pad_new (const gchar * name, GstPadDirection direction)
 /**
  * gst_pad_new_from_template:
  * @templ: the pad template to use
- * @name: the name of the element
+ * @name: (allow-none): the name of the element
  *
  * Creates a new pad with the given name from the given template.
  * If name is %NULL, a guaranteed unique name (across all pads)

gst/gstpad.h

@@ -251,9 +251,9 @@ typedef gboolean		(*GstPadActivateModeFunction)	(GstPad *pad, GstObject *parent,
 /**
  * GstPadChainFunction:
  * @pad: the sink #GstPad that performed the chain.
- * @parent: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
- *          @parent is guaranteed to be not-%NULL and remain valid during the
- *          execution of this function.
+ * @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
+ *          flag is set, @parent is guaranteed to be not-%NULL and remain valid
+ *          during the execution of this function.
  * @buffer: the #GstBuffer that is chained, not %NULL.
  *
  * A function that will be called on sinkpads when chaining buffers.
@@ -274,9 +274,9 @@ typedef GstFlowReturn		(*GstPadChainFunction)		(GstPad *pad, GstObject *parent,
 /**
  * GstPadChainListFunction:
  * @pad: the sink #GstPad that performed the chain.
- * @parent: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
- *          @parent is guaranteed to be not-%NULL and remain valid during the
- *          execution of this function.
+ * @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
+ *          flag is set, @parent is guaranteed to be not-%NULL and remain valid
+ *          during the execution of this function.
  * @list: the #GstBufferList that is chained, not %NULL.
  *
  * A function that will be called on sinkpads when chaining buffer lists.
@@ -297,9 +297,9 @@ typedef GstFlowReturn		(*GstPadChainListFunction)	(GstPad *pad, GstObject *paren
 /**
  * GstPadGetRangeFunction:
  * @pad: the src #GstPad to perform the getrange on.
- * @parent: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
- *          @parent is guaranteed to be not-%NULL and remain valid during the
- *          execution of this function.
+ * @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
+ *          flag is set, @parent is guaranteed to be not-%NULL and remain valid
+ *          during the execution of this function.
  * @offset: the offset of the range
  * @length: the length of the range
  * @buffer: a memory location to hold the result buffer, cannot be %NULL.
@@ -348,9 +348,9 @@ typedef GstFlowReturn		(*GstPadGetRangeFunction)	(GstPad *pad, GstObject *parent
 /**
  * GstPadEventFunction:
  * @pad: the #GstPad to handle the event.
- * @parent: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
- *          @parent is guaranteed to be not-%NULL and remain valid during the
- *          execution of this function.
+ * @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
+ *          flag is set, @parent is guaranteed to be not-%NULL and remain valid
+ *          during the execution of this function.
  * @event: the #GstEvent to handle.
  *
  * Function signature to handle an event for the pad.
@@ -365,9 +365,9 @@ typedef gboolean		(*GstPadEventFunction)		(GstPad *pad, GstObject *parent,
 /**
  * GstPadIterIntLinkFunction:
  * @pad: The #GstPad to query.
- * @parent: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
- *          @parent is guaranteed to be not-%NULL and remain valid during the
- *          execution of this function.
+ * @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
+ *          flag is set, @parent is guaranteed to be not-%NULL and remain valid
+ *          during the execution of this function.
  *
  * The signature of the internal pad link iterator function.
  *
@@ -382,9 +382,9 @@ typedef GstIterator*           (*GstPadIterIntLinkFunction)    (GstPad *pad, Gst
 /**
  * GstPadQueryFunction:
  * @pad: the #GstPad to query.
- * @parent: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
- *          @parent is guaranteed to be not-%NULL and remain valid during the
- *          execution of this function.
+ * @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
+ *          flag is set, @parent is guaranteed to be not-%NULL and remain valid
+ *          during the execution of this function.
  * @query: the #GstQuery object to execute
  *
  * The signature of the query function.
@@ -399,9 +399,9 @@ typedef gboolean		(*GstPadQueryFunction)		(GstPad *pad, GstObject *parent,
 /**
  * GstPadLinkFunction:
  * @pad: the #GstPad that is linked.
- * @parent: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
- *          @parent is guaranteed to be not-%NULL and remain valid during the
- *          execution of this function.
+ * @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
+ *          flag is set, @parent is guaranteed to be not-%NULL and remain valid
+ *          during the execution of this function.
  * @peer: the peer #GstPad of the link
  *
  * Function signature to handle a new link on the pad.
@@ -412,9 +412,9 @@ typedef GstPadLinkReturn	(*GstPadLinkFunction)		(GstPad *pad, GstObject *parent,
 /**
  * GstPadUnlinkFunction:
  * @pad: the #GstPad that is linked.
- * @parent: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
- *          @parent is guaranteed to be not-%NULL and remain valid during the
- *          execution of this function.
+ * @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
+ *          flag is set, @parent is guaranteed to be not-%NULL and remain valid
+ *          during the execution of this function.
  *
  * Function signature to handle a unlinking the pad prom its peer.
  */
@@ -524,8 +524,8 @@ typedef enum
  * GstPadProbeInfo:
  * @type: the current probe type
  * @id: the id of the probe
- * @data: type specific data, check the @type field to know the datatype.
- *    This field can be %NULL.
+ * @data: (allow-none): type specific data, check the @type field to know the
+ *    datatype.  This field can be %NULL.
  * @offset: offset of pull probe, this field is valid when @type contains
  *    #GST_PAD_PROBE_TYPE_PULL
  * @size: size of pull probe, this field is valid when @type contains
@@ -581,7 +581,7 @@ typedef GstPadProbeReturn   (*GstPadProbeCallback)   (GstPad *pad, GstPadProbeIn
 /**
  * GstPadStickyEventsForeachFunction:
  * @pad: the #GstPad.
- * @event: a sticky #GstEvent.
+ * @event: (allow-none): a sticky #GstEvent.
  * @user_data: the #gpointer to optional user data.
  *
  * Callback used by gst_pad_sticky_events_foreach().

gst/gstplugin.h

@@ -145,11 +145,12 @@ typedef gboolean (*GstPluginInitFullFunc) (GstPlugin *plugin, gpointer user_data
  * @source: source module plugin belongs to
  * @package: shipped package plugin belongs to
  * @origin: URL to provider of plugin
- * @release_datetime: date time string in ISO 8601 format (or rather, a
- *     subset thereof), or %NULL. Allowed are the following formats:
- *     "YYYY-MM-DD" and "YYY-MM-DDTHH:MMZ" (with 'T' a separator and 'Z'
- *     indicating UTC/Zulu time). This field should be set via the
- *     GST_PACKAGE_RELEASE_DATETIME preprocessor macro.
+ * @release_datetime: (allow-none): date time string in ISO 8601
+ *     format (or rather, a subset thereof), or %NULL. Allowed are the
+ *     following formats: "YYYY-MM-DD" and "YYY-MM-DDTHH:MMZ" (with
+ *     'T' a separator and 'Z' indicating UTC/Zulu time). This field
+ *     should be set via the %GST_PACKAGE_RELEASE_DATETIME
+ *     preprocessor macro.
  *
  * A plugin should export a variable of this type called plugin_desc. The plugin
  * loader will use the data provided there to initialize the plugin.

gst/gstpreset.c

@@ -1069,7 +1069,7 @@ gst_preset_delete_preset (GstPreset * preset, const gchar * name)
  * @preset: a #GObject that implements #GstPreset
  * @name: preset name
  * @tag: meta data item name
- * @value: new value
+ * @value: (allow-none): new value
  *
  * Sets a new @value for an existing meta data item or adds a new item. Meta
  * data @tag names can be something like e.g. "comment". Supplying %NULL for the

gst/gsttaglist.c

@@ -1133,8 +1133,8 @@ gst_tag_list_insert (GstTagList * into, const GstTagList * from,
 
 /**
  * gst_tag_list_merge:
- * @list1: first list to merge
- * @list2: second list to merge
+ * @list1: (allow-none): first list to merge
+ * @list2: (allow-none): second list to merge
  * @mode: the mode to use
  *
  * Merges the two given lists into a new list. If one of the lists is %NULL, a