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ee235a6b07
Avoid playing with the refcount to decide when a buffer has been recycled by the dispose function. The problem is that we then temporarily can have a buffer with a refcount > 1 being acquired from the pool, which is not writable. Instead use a simple boolean return value from the dispose function to inform the called that the object was recycled or not.
224 lines
6.9 KiB
C
224 lines
6.9 KiB
C
/* GStreamer
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* Copyright (C) 2005 David Schleef <ds@schleef.org>
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*
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* gstminiobject.h: Header for GstMiniObject
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_MINI_OBJECT_H__
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#define __GST_MINI_OBJECT_H__
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#include <gst/gstconfig.h>
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#include <glib-object.h>
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G_BEGIN_DECLS
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#define GST_IS_MINI_OBJECT_TYPE(obj,type) ((obj) && GST_MINI_OBJECT_TYPE(obj) == (type))
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#define GST_MINI_OBJECT_CAST(obj) ((GstMiniObject*)(obj))
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#define GST_MINI_OBJECT_CONST_CAST(obj) ((const GstMiniObject*)(obj))
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#define GST_MINI_OBJECT(obj) (GST_MINI_OBJECT_CAST(obj))
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typedef struct _GstMiniObject GstMiniObject;
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/**
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* GstMiniObjectCopyFunction:
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* @obj: MiniObject to copy
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*
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* Function prototype for methods to create copies of instances.
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*
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* Returns: reference to cloned instance.
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*/
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typedef GstMiniObject * (*GstMiniObjectCopyFunction) (const GstMiniObject *obj);
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/**
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* GstMiniObjectDisposeFunction:
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* @obj: MiniObject to dispose
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*
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* Function prototype for when a miniobject has lost its last refcount.
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* Implementation of the mini object are allowed to revive the
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* passed object by doing a gst_mini_object_ref(). If the object is not
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* revived after the dispose function, the function should return %TRUE
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* and the memory associated with the object is freed.
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*
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* Returns: %TRUE if the object should be cleaned up.
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*/
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typedef gboolean (*GstMiniObjectDisposeFunction) (GstMiniObject *obj);
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/**
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* GstMiniObjectFreeFunction:
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* @obj: MiniObject to free
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*
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* Virtual function prototype for methods to free ressources used by
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* mini-objects.
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*/
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typedef void (*GstMiniObjectFreeFunction) (GstMiniObject *obj);
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/**
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* GstMiniObjectWeakNotify:
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* @data: data that was provided when the weak reference was established
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* @where_the_mini_object_was: the mini object being finalized
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*
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* A #GstMiniObjectWeakNotify function can be added to a mini object as a
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* callback that gets triggered when the mini object is finalized. Since the
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* mini object is already being finalized when the #GstMiniObjectWeakNotify is
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* called, there's not much you could do with the object, apart from e.g. using
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* its adress as hash-index or the like.
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*
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* Since: 0.10.35
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*/
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typedef void (*GstMiniObjectWeakNotify) (gpointer data,
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GstMiniObject * where_the_mini_object_was);
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/**
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* GST_MINI_OBJECT_FLAGS:
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* @obj: MiniObject to return flags for.
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*
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* This macro returns the entire set of flags for the mini-object.
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*/
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#define GST_MINI_OBJECT_TYPE(obj) (GST_MINI_OBJECT_CAST(obj)->type)
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/**
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* GST_MINI_OBJECT_FLAGS:
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* @obj: MiniObject to return flags for.
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*
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* This macro returns the entire set of flags for the mini-object.
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*/
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#define GST_MINI_OBJECT_FLAGS(obj) (GST_MINI_OBJECT_CAST(obj)->flags)
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/**
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* GST_MINI_OBJECT_FLAG_IS_SET:
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* @obj: MiniObject to check for flags.
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* @flag: Flag to check for
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*
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* This macro checks to see if the given flag is set.
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*/
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#define GST_MINI_OBJECT_FLAG_IS_SET(obj,flag) !!(GST_MINI_OBJECT_FLAGS (obj) & (flag))
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/**
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* GST_MINI_OBJECT_FLAG_SET:
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* @obj: MiniObject to set flag in.
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* @flag: Flag to set, can by any number of bits in guint32.
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*
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* This macro sets the given bits.
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*/
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#define GST_MINI_OBJECT_FLAG_SET(obj,flag) (GST_MINI_OBJECT_FLAGS (obj) |= (flag))
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/**
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* GST_MINI_OBJECT_FLAG_UNSET:
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* @obj: MiniObject to unset flag in.
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* @flag: Flag to set, must be a single bit in guint32.
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*
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* This macro usets the given bits.
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*/
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#define GST_MINI_OBJECT_FLAG_UNSET(obj,flag) (GST_MINI_OBJECT_FLAGS (obj) &= ~(flag))
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/**
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* GstMiniObjectFlags:
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* @GST_MINI_OBJECT_FLAG_LAST: first flag that can be used by subclasses.
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*
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* Flags for the mini object
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*/
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typedef enum
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{
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/* padding */
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GST_MINI_OBJECT_FLAG_LAST = (1<<4)
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} GstMiniObjectFlags;
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/**
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* GST_MINI_OBJECT_REFCOUNT:
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* @obj: a #GstMiniObject
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*
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* Get access to the reference count field of the mini-object.
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*/
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#define GST_MINI_OBJECT_REFCOUNT(obj) ((GST_MINI_OBJECT_CAST(obj))->refcount)
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/**
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* GST_MINI_OBJECT_REFCOUNT_VALUE:
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* @obj: a #GstMiniObject
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*
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* Get the reference count value of the mini-object.
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*/
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#define GST_MINI_OBJECT_REFCOUNT_VALUE(obj) (g_atomic_int_get (&(GST_MINI_OBJECT_CAST(obj))->refcount))
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/**
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* GST_MINI_OBJECT_SIZE:
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* @obj: a #GstMiniObject
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*
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* Get the allocated size of @obj.
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*/
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#define GST_MINI_OBJECT_SIZE(obj) ((GST_MINI_OBJECT_CAST(obj))->size)
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/**
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* GstMiniObject:
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* @refcount: atomic refcount
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* @flags: extra flags.
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* @copy: a copy function
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* @dispose: a dispose function
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* @free: the free function
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*
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* Base class for refcounted lightweight objects.
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* Ref Func: gst_mini_object_ref
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* Unref Func: gst_mini_object_unref
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* Set Value Func: g_value_set_boxed
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* Get Value Func: g_value_get_boxed
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*/
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struct _GstMiniObject {
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GType type;
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/*< public >*/ /* with COW */
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gint refcount;
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guint flags;
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gsize size;
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GstMiniObjectCopyFunction copy;
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GstMiniObjectDisposeFunction dispose;
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GstMiniObjectFreeFunction free;
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/* < private > */
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/* Used to keep track of weak ref notifies */
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guint n_weak_refs;
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struct
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{
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GstMiniObjectWeakNotify notify;
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gpointer data;
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} *weak_refs;
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};
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GType gst_mini_object_register (const gchar *name);
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void gst_mini_object_init (GstMiniObject *mini_object,
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GType type, gsize size);
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GstMiniObject * gst_mini_object_copy (const GstMiniObject *mini_object);
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gboolean gst_mini_object_is_writable (const GstMiniObject *mini_object);
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GstMiniObject * gst_mini_object_make_writable (GstMiniObject *mini_object);
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/* refcounting */
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GstMiniObject * gst_mini_object_ref (GstMiniObject *mini_object);
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void gst_mini_object_unref (GstMiniObject *mini_object);
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void gst_mini_object_weak_ref (GstMiniObject *object,
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GstMiniObjectWeakNotify notify,
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gpointer data);
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void gst_mini_object_weak_unref (GstMiniObject *object,
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GstMiniObjectWeakNotify notify,
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gpointer data);
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gboolean gst_mini_object_replace (GstMiniObject **olddata, GstMiniObject *newdata);
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gboolean gst_mini_object_take (GstMiniObject **olddata, GstMiniObject *newdata);
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GstMiniObject * gst_mini_object_steal (GstMiniObject **olddata);
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G_END_DECLS
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#endif
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