/* GStreamer * Copyright (C) 2005 David Schleef <ds@schleef.org> * * gstminiobject.h: Header for GstMiniObject * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #ifndef __GST_MINI_OBJECT_H__ #define __GST_MINI_OBJECT_H__ #include <gst/gstconfig.h> #include <glib-object.h> G_BEGIN_DECLS #define GST_TYPE_MINI_OBJECT (gst_mini_object_get_type()) #define GST_IS_MINI_OBJECT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_MINI_OBJECT)) #define GST_IS_MINI_OBJECT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_MINI_OBJECT)) #define GST_MINI_OBJECT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_MINI_OBJECT, GstMiniObjectClass)) #define GST_MINI_OBJECT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_MINI_OBJECT, GstMiniObject)) #define GST_MINI_OBJECT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_MINI_OBJECT, GstMiniObjectClass)) #define GST_MINI_OBJECT_CAST(obj) ((GstMiniObject*)(obj)) typedef struct _GstMiniObject GstMiniObject; typedef struct _GstMiniObjectClass GstMiniObjectClass; /** * GstMiniObjectCopyFunction: * @obj: MiniObject to copy * * Virtual function prototype for methods to create copies of instances. * * Returns: reference to cloned instance. */ typedef GstMiniObject * (*GstMiniObjectCopyFunction) (const GstMiniObject *obj); /** * GstMiniObjectFinalizeFunction: * @obj: MiniObject to finalize * * Virtual function prototype for methods to free ressources used by * mini-objects. Subclasses of the mini object are allowed to revive the * passed object by doing a gst_mini_object_ref(). If the object is not * revived after the finalize function, the memory associated with the * object is freed. */ typedef void (*GstMiniObjectFinalizeFunction) (GstMiniObject *obj); /** * GST_MINI_OBJECT_FLAGS: * @obj: MiniObject to return flags for. * * This macro returns the entire set of flags for the mini-object. */ #define GST_MINI_OBJECT_FLAGS(obj) (GST_MINI_OBJECT_CAST(obj)->flags) /** * GST_MINI_OBJECT_FLAG_IS_SET: * @obj: MiniObject to check for flags. * @flag: Flag to check for * * This macro checks to see if the given flag is set. */ #define GST_MINI_OBJECT_FLAG_IS_SET(obj,flag) !!(GST_MINI_OBJECT_FLAGS (obj) & (flag)) /** * GST_MINI_OBJECT_FLAG_SET: * @obj: MiniObject to set flag in. * @flag: Flag to set, can by any number of bits in guint32. * * This macro sets the given bits. */ #define GST_MINI_OBJECT_FLAG_SET(obj,flag) (GST_MINI_OBJECT_FLAGS (obj) |= (flag)) /** * GST_MINI_OBJECT_FLAG_UNSET: * @obj: MiniObject to unset flag in. * @flag: Flag to set, must be a single bit in guint32. * * This macro usets the given bits. */ #define GST_MINI_OBJECT_FLAG_UNSET(obj,flag) (GST_MINI_OBJECT_FLAGS (obj) &= ~(flag)) /** * GST_VALUE_HOLDS_MINI_OBJECT: * @value: the #GValue to check * * Checks if the given #GValue contains a #GST_TYPE_MINI_OBJECT value. */ #define GST_VALUE_HOLDS_MINI_OBJECT(value) (G_VALUE_HOLDS(value, GST_TYPE_MINI_OBJECT)) /** * GstMiniObjectFlags: * @GST_MINI_OBJECT_FLAG_READONLY: is the miniobject readonly or writable * @GST_MINI_OBJECT_FLAG_LAST: first flag that can be used by subclasses. * * Flags for the padtemplate */ typedef enum { GST_MINI_OBJECT_FLAG_READONLY = (1<<0), /* padding */ GST_MINI_OBJECT_FLAG_LAST = (1<<4) } GstMiniObjectFlags; /** * GST_MINI_OBJECT_REFCOUNT: * @obj: a #GstMiniObject * * Get access to the reference count field of the mini-object. */ #define GST_MINI_OBJECT_REFCOUNT(obj) ((GST_MINI_OBJECT_CAST(obj))->refcount) /** * GST_MINI_OBJECT_REFCOUNT_VALUE: * @obj: a #GstMiniObject * * Get the reference count value of the mini-object. */ #define GST_MINI_OBJECT_REFCOUNT_VALUE(obj) (g_atomic_int_get (&(GST_MINI_OBJECT_CAST(obj))->refcount)) /** * GstMiniObject: * @instance: type instance * @refcount: atomic refcount * @flags: extra flags. * * Base class for refcounted lightweight objects. */ struct _GstMiniObject { GTypeInstance instance; /*< public >*/ /* with COW */ gint refcount; guint flags; /*< private >*/ gpointer _gst_reserved; }; struct _GstMiniObjectClass { GTypeClass type_class; GstMiniObjectCopyFunction copy; GstMiniObjectFinalizeFunction finalize; /*< private >*/ gpointer _gst_reserved; }; GType gst_mini_object_get_type (void); GstMiniObject* gst_mini_object_new (GType type); GstMiniObject* gst_mini_object_copy (const GstMiniObject *mini_object); gboolean gst_mini_object_is_writable (const GstMiniObject *mini_object); GstMiniObject* gst_mini_object_make_writable (GstMiniObject *mini_object); /* refcounting */ GstMiniObject* gst_mini_object_ref (GstMiniObject *mini_object); void gst_mini_object_unref (GstMiniObject *mini_object); void gst_mini_object_replace (GstMiniObject **olddata, GstMiniObject *newdata); /* GParamSpec */ GParamSpec* gst_param_spec_mini_object (const char *name, const char *nick, const char *blurb, GType object_type, GParamFlags flags); /* GValue stuff */ void gst_value_set_mini_object (GValue *value, GstMiniObject *mini_object); void gst_value_take_mini_object (GValue *value, GstMiniObject *mini_object); GstMiniObject* gst_value_get_mini_object (const GValue *value); G_END_DECLS #endif