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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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, 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 resources used by
* mini-objects.
*/
typedef void (*GstMiniObjectFreeFunction) (GstMiniObject *obj);
/**
* GstMiniObjectNotify:
* @user_data: data that was provided when the notify was added
* @obj: the mini object
*
* A #GstMiniObjectNotify function can be added to a mini object as a
* callback that gets triggered when gst_mini_object_unref() drops the
* last ref and @obj is about to be freed.
*/
typedef void (*GstMiniObjectNotify) (gpointer user_data, GstMiniObject * obj);
/**
* 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 unsets the given bits.
*/
#define GST_MINI_OBJECT_FLAG_UNSET(obj,flag) (GST_MINI_OBJECT_FLAGS (obj) &= ~(flag))
/**
* GstMiniObjectFlags:
* @GST_MINI_OBJECT_FLAG_LOCKABLE: the object can be locked and unlocked with
* gst_mini_object_lock() and gst_mini_object_unlock().
* @GST_MINI_OBJECT_FLAG_LOCK_READONLY: the object is permanently locked in
* READONLY mode. Only read locks can be performed on the object.
* @GST_MINI_OBJECT_FLAG_LAST: first flag that can be used by subclasses.
*
* Flags for the mini object
*/
typedef enum
{
GST_MINI_OBJECT_FLAG_LOCKABLE = (1 << 0),
GST_MINI_OBJECT_FLAG_LOCK_READONLY = (1 << 1),
/* padding */
GST_MINI_OBJECT_FLAG_LAST = (1 << 4)
} GstMiniObjectFlags;
/**
* GST_MINI_OBJECT_IS_LOCKABLE:
* @obj: a #GstMiniObject
*
* Check if @obj is lockable. A lockable object can be locked and unlocked with
* gst_mini_object_lock() and gst_mini_object_unlock().
*/
#define GST_MINI_OBJECT_IS_LOCKABLE(obj) GST_MINI_OBJECT_FLAG_IS_SET(obj, GST_MINI_OBJECT_FLAG_LOCKABLE)
/**
* GstLockFlags:
* @GST_LOCK_FLAG_READ: lock for read access
* @GST_LOCK_FLAG_WRITE: lock for write access
* @GST_LOCK_FLAG_EXCLUSIVE: lock for exclusive access
* @GST_LOCK_FLAG_LAST: first flag that can be used for custom purposes
*
* Flags used when locking miniobjects
*/
typedef enum {
GST_LOCK_FLAG_READ = (1 << 0),
GST_LOCK_FLAG_WRITE = (1 << 1),
GST_LOCK_FLAG_EXCLUSIVE = (1 << 2),
GST_LOCK_FLAG_LAST = (1 << 8)
} GstLockFlags;
/**
* GST_LOCK_FLAG_READWRITE:
*
* GstLockFlags value alias for GST_LOCK_FLAG_READ | GST_LOCK_FLAG_WRITE
*/
#define GST_LOCK_FLAG_READWRITE (GST_LOCK_FLAG_READ | GST_LOCK_FLAG_WRITE)
/**
* 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: (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)
* @type: the GType of the object
* @refcount: atomic refcount
* @lockstate: atomic state of the locks
* @flags: extra flags.
* @copy: a copy function
* @dispose: a dispose function
* @free: the free function
*
* Base class for refcounted lightweight objects.
*/
struct _GstMiniObject {
GType type;
/*< public >*/ /* with COW */
gint refcount;
gint lockstate;
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,
guint flags, GType type,
GstMiniObjectCopyFunction copy_func,
GstMiniObjectDisposeFunction dispose_func,
GstMiniObjectFreeFunction free_func);
/* 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,
GstMiniObjectNotify notify,
gpointer data);
void gst_mini_object_weak_unref (GstMiniObject *object,
GstMiniObjectNotify notify,
gpointer data);
/* locking */
gboolean gst_mini_object_lock (GstMiniObject *object, GstLockFlags flags);
void gst_mini_object_unlock (GstMiniObject *object, GstLockFlags flags);
gboolean gst_mini_object_is_writable (const GstMiniObject *mini_object);
GstMiniObject * gst_mini_object_make_writable (GstMiniObject *mini_object);
/* copy */
GstMiniObject * gst_mini_object_copy (const GstMiniObject *mini_object) G_GNUC_MALLOC;
void gst_mini_object_set_qdata (GstMiniObject *object, GQuark quark,
gpointer data, GDestroyNotify destroy);
gpointer gst_mini_object_get_qdata (GstMiniObject *object, GQuark quark);
gpointer gst_mini_object_steal_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
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