gstreamer/gst/gstobject.h

/* GStreamer
 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
 *                    2000 Wim Taymans <wtay@chello.be>
 *                    2004 Wim Taymans <wim@fluendo.com>
 *
 * gstobject.h: Header for base GstObject
 *
 * 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_OBJECT_H__
#define __GST_OBJECT_H__

#include <gst/gstconfig.h>

#include <glib-object.h>	/* note that this gets wrapped in __GST_OBJECT_H__ */

#include <gst/gstatomic.h>
#include <gst/gsttypes.h>

G_BEGIN_DECLS

GST_EXPORT GType _gst_object_type;

#define GST_TYPE_OBJECT			(_gst_object_type)
#define GST_IS_OBJECT(obj)		(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_OBJECT))
#define GST_IS_OBJECT_CLASS(klass)	(G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_OBJECT))
#define GST_OBJECT_GET_CLASS(obj)	(G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_OBJECT, GstObjectClass))
#define GST_OBJECT(obj)			(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_OBJECT, GstObject))
#define GST_OBJECT_CLASS(klass)		(G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_OBJECT, GstObjectClass))
#define GST_OBJECT_CAST(obj)		((GstObject*)(obj))
#define GST_OBJECT_CLASS_CAST(klass)	((GstObjectClass*)(klass))

/* make sure we don't change the object size but stil make it compile
 * without libxml */
#ifdef GST_DISABLE_LOADSAVE_REGISTRY
#define xmlNodePtr	gpointer
#endif

typedef enum
{
  GST_OBJECT_DISPOSING   = 0,
  GST_OBJECT_DESTROYED   = 1,
  GST_OBJECT_FLOATING,

  GST_OBJECT_FLAG_LAST   = 4
} GstObjectFlags;

#define GST_OBJECT_REFCOUNT(caps)               ((GST_OBJECT_CAST(caps))->refcount)
#define GST_OBJECT_REFCOUNT_VALUE(caps)         (gst_atomic_int_read (&(GST_OBJECT_CAST(caps))->refcount))

/* we do a GST_OBJECT_CAST to avoid type checking, better call these
 * function with a valid object! */
#define GST_LOCK(obj)			(g_mutex_lock(GST_OBJECT_CAST(obj)->lock))
#define GST_TRYLOCK(obj)		(g_mutex_trylock(GST_OBJECT_CAST(obj)->lock))
#define GST_UNLOCK(obj)			(g_mutex_unlock(GST_OBJECT_CAST(obj)->lock))
#define GST_GET_LOCK(obj)		(GST_OBJECT_CAST(obj)->lock)

#define GST_OBJECT_NAME(obj)		(GST_OBJECT_CAST(obj)->name)
#define GST_OBJECT_PARENT(obj)		(GST_OBJECT_CAST(obj)->parent)

/* for the flags we double-not to make them comparable to TRUE and FALSE */
#define GST_FLAGS(obj)			(GST_OBJECT_CAST (obj)->flags)
#define GST_FLAG_IS_SET(obj,flag)	(!!(GST_FLAGS (obj) & (1<<(flag))))
#define GST_FLAG_SET(obj,flag)		G_STMT_START{ (GST_FLAGS (obj) |= (1<<(flag))); }G_STMT_END
#define GST_FLAG_UNSET(obj,flag)	G_STMT_START{ (GST_FLAGS (obj) &= ~(1<<(flag))); }G_STMT_END

#define GST_OBJECT_IS_DESTROYED(obj)	(GST_FLAG_IS_SET (obj, GST_OBJECT_DESTROYED))
#define GST_OBJECT_IS_FLOATING(obj)	(GST_FLAG_IS_SET (obj, GST_OBJECT_FLOATING))

struct _GstObject {
  GObject	 object;

  /*< public >*/
  GstAtomicInt	 refcount;

  /*< public >*/ /* with LOCK */
  GMutex    *lock;        /* object LOCK */
  gchar	    *name;        /* object name */
  GstObject *parent;      /* this object's parent, weak ref */
  guint32   flags;

  /* FIXME: in padding, move on up */
  gchar     *name_prefix; /* used for debugging */

  /*< private >*/
  gpointer  _gst_reserved[GST_PADDING - 1];
};


#define GST_CLASS_LOCK(obj)		(g_mutex_lock(GST_OBJECT_CLASS_CAST(obj)->lock))
#define GST_CLASS_TRYLOCK(obj)		(g_mutex_trylock(GST_OBJECT_CLASS_CAST(obj)->lock))
#define GST_CLASS_UNLOCK(obj)		(g_mutex_unlock(GST_OBJECT_CLASS_CAST(obj)->lock))
#define GST_CLASS_GET_LOCK(obj)		(GST_OBJECT_CLASS_CAST(obj)->lock)

/* signal_object is used to signal to the whole class */
struct _GstObjectClass {
  GObjectClass	parent_class;

  gchar		*path_string_separator;
  GObject	*signal_object;

  GMutex	*lock;

  /* signals */
  void		(*parent_set)		(GstObject *object, GstObject *parent);
  void		(*parent_unset)		(GstObject *object, GstObject *parent);
  void		(*object_saved)		(GstObject *object, xmlNodePtr parent);
  void 		(*deep_notify)   	(GstObject *object, GstObject *orig, GParamSpec *pspec);

  /* vtable */
  void		(*destroy)		(GstObject *object);

  xmlNodePtr	(*save_thyself)		(GstObject *object, xmlNodePtr parent);
  void		(*restore_thyself)	(GstObject *object, xmlNodePtr self);

  /*< private >*/
  gpointer _gst_reserved[GST_PADDING];
};

/* normal GObject stuff */
GType		gst_object_get_type		(void);

/* name routines */
gboolean	gst_object_set_name		(GstObject *object, const gchar *name_prefix);
gchar*		gst_object_get_name		(GstObject *object);
void		gst_object_set_name_prefix	(GstObject *object, const gchar *name_prefix);
gchar*		gst_object_get_name_prefix	(GstObject *object);

/* parentage routines */
gboolean	gst_object_set_parent		(GstObject *object, GstObject *parent);
GstObject*	gst_object_get_parent		(GstObject *object);
void		gst_object_unparent		(GstObject *object);

void            gst_object_default_deep_notify 	(GObject *object, GstObject *orig, 
                                                 GParamSpec *pspec, gchar **excluded_props);

/* refcounting + life cycle */
GstObject *	gst_object_ref			(GstObject *object);
GstObject *	gst_object_unref		(GstObject *object);
void 		gst_object_sink			(GstObject *object);

/* replace object pointer */
void 		gst_object_replace		(GstObject **oldobj, GstObject *newobj);

/* printing out the 'path' of the object */
gchar *		gst_object_get_path_string	(GstObject *object);

/* misc utils */
gboolean	gst_object_check_uniqueness	(GList *list, const gchar *name);

/* load/save */
#ifndef GST_DISABLE_LOADSAVE_REGISTRY
xmlNodePtr	gst_object_save_thyself		(GstObject *object, xmlNodePtr parent);
void		gst_object_restore_thyself	(GstObject *object, xmlNodePtr self);
#else
#if defined _GNUC_ && _GNUC_ >= 3
#pragma GCC poison gst_object_save_thyself
#pragma GCC poison gst_object_restore_thyself
#endif
#endif

/* class signal stuff */
guint		gst_class_signal_connect	(GstObjectClass	*klass,
						 const gchar	*name,
						 gpointer	 func,
						 gpointer	 func_data);

#ifndef GST_DISABLE_LOADSAVE_REGISTRY
void		gst_class_signal_emit_by_name	(GstObject	*object,
		                                 const gchar	*name,
						 xmlNodePtr 	 self);
#else
#if defined _GNUC_ && _GNUC_ >= 3
#pragma GCC poison gst_class_signal_emit_by_name
#endif
#endif


G_END_DECLS

#endif /* __GST_OBJECT_H__ */