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gstreamer/gst/gstminiobject.h

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/* 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))
#define GST_MINI_OBJECT_CONST_CAST(obj) ((const 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_RESERVED1: a flag reserved for internal use e.g. as
* GST_BUFFER_FLAG_MEDIA4. Since: 0.10.33.
* @GST_MINI_OBJECT_FLAG_LAST: first flag that can be used by subclasses.
*
* Flags for the mini object
*/
typedef enum
{
GST_MINI_OBJECT_FLAG_READONLY = (1<<0),
GST_MINI_OBJECT_FLAG_RESERVED1 = (1<<1),
/* 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))
/**
* 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);
typedef struct _GstMiniObjectPrivate GstMiniObjectPrivate;
/**
* GstMiniObject:
* @instance: type instance
* @refcount: atomic refcount
* @flags: extra flags.
*
* Base class for refcounted lightweight objects.
* Ref Func: gst_mini_object_ref
* Unref Func: gst_mini_object_unref
* Set Value Func: gst_value_set_mini_object
* Get Value Func: gst_value_get_mini_object
*/
struct _GstMiniObject {
GTypeInstance instance;
/*< public >*/ /* with COW */
gint refcount;
guint flags;
/*< private >*/
GstMiniObjectPrivate *priv;
};
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_weak_ref (GstMiniObject *object,
GstMiniObjectWeakNotify notify,
gpointer data);
void gst_mini_object_weak_unref (GstMiniObject *object,
GstMiniObjectWeakNotify notify,
gpointer data);
void gst_mini_object_replace (GstMiniObject **olddata, GstMiniObject *newdata);
/* GParamSpec */
#define GST_TYPE_PARAM_MINI_OBJECT (gst_param_spec_mini_object_get_type())
#define GST_IS_PARAM_SPEC_MINI_OBJECT(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), \
GST_TYPE_PARAM_MINI_OBJECT))
#define GST_PARAM_SPEC_MINI_OBJECT(pspec) (G_TYPE_CHECK_INSTANCE_CAST ((pspec), \
GST_TYPE_PARAM_MINI_OBJECT, \
GstParamSpecMiniObject))
typedef struct _GstParamSpecMiniObject GstParamSpecMiniObject;
/**
* GstParamSpecMiniObject:
* @parent_instance: private %GParamSpec portion
*
* A %GParamSpec derived structure that contains the meta data
* for %GstMiniObject properties.
*/
struct _GstParamSpecMiniObject
{
GParamSpec parent_instance;
};
GType gst_param_spec_mini_object_get_type (void);
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);
GstMiniObject* gst_value_dup_mini_object (const GValue *value);
G_END_DECLS
#endif
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