mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-10 11:29:55 +00:00
225 lines
7.2 KiB
C
225 lines
7.2 KiB
C
/* 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_IS_MINI_OBJECT_TYPE(obj,type) ((obj) && GST_MINI_OBJECT_TYPE(obj) == (type))
|
|
#define GST_MINI_OBJECT_CAST(obj) ((GstMiniObject*)(obj))
|
|
#define GST_MINI_OBJECT_CONST_CAST(obj) ((const GstMiniObject*)(obj))
|
|
#define GST_MINI_OBJECT(obj) (GST_MINI_OBJECT_CAST(obj))
|
|
|
|
typedef struct _GstMiniObject GstMiniObject;
|
|
|
|
/**
|
|
* GstMiniObjectCopyFunction:
|
|
* @obj: MiniObject to copy
|
|
*
|
|
* Function prototype for methods to create copies of instances.
|
|
*
|
|
* Returns: reference to cloned instance.
|
|
*/
|
|
typedef GstMiniObject * (*GstMiniObjectCopyFunction) (const GstMiniObject *obj);
|
|
/**
|
|
* GstMiniObjectDisposeFunction:
|
|
* @obj: MiniObject to dispose
|
|
*
|
|
* Function prototype for when a miniobject has lost its last refcount.
|
|
* Implementation 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 dispose function, the function should return %TRUE
|
|
* and the memory associated with the object is freed.
|
|
*
|
|
* Returns: %TRUE if the object should be cleaned up.
|
|
*/
|
|
typedef gboolean (*GstMiniObjectDisposeFunction) (GstMiniObject *obj);
|
|
/**
|
|
* GstMiniObjectFreeFunction:
|
|
* @obj: MiniObject to free
|
|
*
|
|
* Virtual function prototype for methods to free ressources used by
|
|
* mini-objects.
|
|
*/
|
|
typedef void (*GstMiniObjectFreeFunction) (GstMiniObject *obj);
|
|
|
|
/**
|
|
* GstMiniObjectWeakNotify:
|
|
* @data: data that was provided when the weak reference was established
|
|
* @where_the_mini_object_was: the mini object being finalized
|
|
*
|
|
* A #GstMiniObjectWeakNotify function can be added to a mini object as a
|
|
* callback that gets triggered when the mini object is finalized. Since the
|
|
* mini object is already being finalized when the #GstMiniObjectWeakNotify is
|
|
* called, there's not much you could do with the object, apart from e.g. using
|
|
* its adress as hash-index or the like.
|
|
*
|
|
* Since: 0.10.35
|
|
*/
|
|
typedef void (*GstMiniObjectWeakNotify) (gpointer data,
|
|
GstMiniObject * where_the_mini_object_was);
|
|
|
|
/**
|
|
* GST_MINI_OBJECT_TYPE:
|
|
* @obj: MiniObject to return type for.
|
|
*
|
|
* This macro returns the type of the mini-object.
|
|
*/
|
|
#define GST_MINI_OBJECT_TYPE(obj) (GST_MINI_OBJECT_CAST(obj)->type)
|
|
/**
|
|
* 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))
|
|
|
|
/**
|
|
* GstMiniObjectFlags:
|
|
* @GST_MINI_OBJECT_FLAG_LAST: first flag that can be used by subclasses.
|
|
*
|
|
* Flags for the mini object
|
|
*/
|
|
typedef enum
|
|
{
|
|
/* 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:
|
|
* @type: the GType of the object
|
|
* @refcount: atomic refcount
|
|
* @flags: extra flags.
|
|
* @copy: a copy function
|
|
* @dispose: a dispose function
|
|
* @free: the free function
|
|
*
|
|
* Base class for refcounted lightweight objects.
|
|
* Ref Func: gst_mini_object_ref
|
|
* Unref Func: gst_mini_object_unref
|
|
* Set Value Func: g_value_set_boxed
|
|
* Get Value Func: g_value_get_boxed
|
|
*/
|
|
struct _GstMiniObject {
|
|
GType type;
|
|
|
|
/*< public >*/ /* with COW */
|
|
gint refcount;
|
|
guint flags;
|
|
|
|
GstMiniObjectCopyFunction copy;
|
|
GstMiniObjectDisposeFunction dispose;
|
|
GstMiniObjectFreeFunction free;
|
|
|
|
/* < private > */
|
|
/* Used to keep track of weak ref notifies and qdata */
|
|
guint n_qdata;
|
|
gpointer qdata;
|
|
};
|
|
|
|
void gst_mini_object_init (GstMiniObject *mini_object, GType type);
|
|
|
|
GstMiniObject * gst_mini_object_copy (const GstMiniObject *mini_object) G_GNUC_MALLOC;
|
|
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_weak_ref (GstMiniObject *object,
|
|
GstMiniObjectWeakNotify notify,
|
|
gpointer data);
|
|
void gst_mini_object_weak_unref (GstMiniObject *object,
|
|
GstMiniObjectWeakNotify notify,
|
|
gpointer data);
|
|
|
|
void gst_mini_object_set_qdata (GstMiniObject *object, GQuark quark,
|
|
gpointer data, GDestroyNotify destroy);
|
|
gpointer gst_mini_object_get_qdata (GstMiniObject *object, GQuark quark);
|
|
|
|
|
|
gboolean gst_mini_object_replace (GstMiniObject **olddata, GstMiniObject *newdata);
|
|
gboolean gst_mini_object_take (GstMiniObject **olddata, GstMiniObject *newdata);
|
|
GstMiniObject * gst_mini_object_steal (GstMiniObject **olddata);
|
|
|
|
/**
|
|
* GST_DEFINE_MINI_OBJECT_TYPE:
|
|
* @TypeName: name of the new type in CamelCase
|
|
* @type_name: name of the new type
|
|
*
|
|
* Define a new mini-object type with the given name
|
|
*/
|
|
#define GST_DEFINE_MINI_OBJECT_TYPE(TypeName,type_name) \
|
|
G_DEFINE_BOXED_TYPE(TypeName,type_name, \
|
|
(GBoxedCopyFunc) gst_mini_object_ref, \
|
|
(GBoxedFreeFunc) gst_mini_object_unref)
|
|
|
|
G_END_DECLS
|
|
|
|
#endif
|
|
|