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6fa351407a
Every container of miniobjects now needs to store itself as parent in the child object, and remove itself again at a later time. A miniobject is only writable if there is at most one parent, and that parent is writable itself, and if the reference count of the miniobject is 1. GstBuffer (for memories), GstBufferList (for buffers) and GstSample (for caps, buffer, bufferlist) was updated accordingly. Without this it was possible to have e.g. a bufferlist with refcount 2 in two places, modifying the same buffer with refcount 1 at the same time. https://bugzilla.gnome.org/show_bug.cgi?id=796692
305 lines
9.6 KiB
C
305 lines
9.6 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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, 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 resources 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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* GstMiniObjectNotify:
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* @user_data: data that was provided when the notify was added
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* @obj: the mini object
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*
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* A #GstMiniObjectNotify function can be added to a mini object as a
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* callback that gets triggered when gst_mini_object_unref() drops the
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* last ref and @obj is about to be freed.
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*/
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typedef void (*GstMiniObjectNotify) (gpointer user_data, GstMiniObject * obj);
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/**
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* GST_MINI_OBJECT_TYPE:
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* @obj: MiniObject to return type for.
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*
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* This macro returns the type of 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 unsets 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_LOCKABLE: the object can be locked and unlocked with
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* gst_mini_object_lock() and gst_mini_object_unlock().
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* @GST_MINI_OBJECT_FLAG_LOCK_READONLY: the object is permanently locked in
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* READONLY mode. Only read locks can be performed on the object.
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* @GST_MINI_OBJECT_FLAG_MAY_BE_LEAKED: the object is expected to stay alive
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* even after gst_deinit() has been called and so should be ignored by leak
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* detection tools. (Since 1.10)
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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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GST_MINI_OBJECT_FLAG_LOCKABLE = (1 << 0),
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GST_MINI_OBJECT_FLAG_LOCK_READONLY = (1 << 1),
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GST_MINI_OBJECT_FLAG_MAY_BE_LEAKED = (1 << 2),
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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_IS_LOCKABLE:
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* @obj: a #GstMiniObject
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*
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* Check if @obj is lockable. A lockable object can be locked and unlocked with
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* gst_mini_object_lock() and gst_mini_object_unlock().
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*/
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#define GST_MINI_OBJECT_IS_LOCKABLE(obj) GST_MINI_OBJECT_FLAG_IS_SET(obj, GST_MINI_OBJECT_FLAG_LOCKABLE)
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/**
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* GstLockFlags:
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* @GST_LOCK_FLAG_READ: lock for read access
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* @GST_LOCK_FLAG_WRITE: lock for write access
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* @GST_LOCK_FLAG_EXCLUSIVE: lock for exclusive access
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* @GST_LOCK_FLAG_LAST: first flag that can be used for custom purposes
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*
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* Flags used when locking miniobjects
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*/
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typedef enum {
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GST_LOCK_FLAG_READ = (1 << 0),
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GST_LOCK_FLAG_WRITE = (1 << 1),
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GST_LOCK_FLAG_EXCLUSIVE = (1 << 2),
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GST_LOCK_FLAG_LAST = (1 << 8)
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} GstLockFlags;
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/**
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* GST_LOCK_FLAG_READWRITE: (value 3) (type GstLockFlags)
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*
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* GstLockFlags value alias for GST_LOCK_FLAG_READ | GST_LOCK_FLAG_WRITE
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*/
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#define GST_LOCK_FLAG_READWRITE ((GstLockFlags) (GST_LOCK_FLAG_READ | GST_LOCK_FLAG_WRITE))
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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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* 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)
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* @type: the GType of the object
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* @refcount: atomic refcount
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* @lockstate: atomic state of the locks
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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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*/
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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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gint lockstate;
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guint flags;
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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 parents, weak ref notifies and qdata */
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guint priv_uint;
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gpointer priv_pointer;
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};
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GST_API
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void gst_mini_object_init (GstMiniObject *mini_object,
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guint flags, GType type,
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GstMiniObjectCopyFunction copy_func,
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GstMiniObjectDisposeFunction dispose_func,
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GstMiniObjectFreeFunction free_func);
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/* refcounting */
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GST_API
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GstMiniObject * gst_mini_object_ref (GstMiniObject *mini_object);
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GST_API
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void gst_mini_object_unref (GstMiniObject *mini_object);
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GST_API
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void gst_mini_object_weak_ref (GstMiniObject *object,
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GstMiniObjectNotify notify,
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gpointer data);
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GST_API
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void gst_mini_object_weak_unref (GstMiniObject *object,
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GstMiniObjectNotify notify,
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gpointer data);
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/* locking */
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GST_API
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gboolean gst_mini_object_lock (GstMiniObject *object, GstLockFlags flags);
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GST_API
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void gst_mini_object_unlock (GstMiniObject *object, GstLockFlags flags);
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GST_API
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gboolean gst_mini_object_is_writable (const GstMiniObject *mini_object);
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GST_API
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GstMiniObject * gst_mini_object_make_writable (GstMiniObject *mini_object) G_GNUC_WARN_UNUSED_RESULT;
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/* copy */
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GST_API
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GstMiniObject * gst_mini_object_copy (const GstMiniObject *mini_object) G_GNUC_MALLOC G_GNUC_WARN_UNUSED_RESULT;
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GST_API
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void gst_mini_object_set_qdata (GstMiniObject *object, GQuark quark,
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gpointer data, GDestroyNotify destroy);
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GST_API
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gpointer gst_mini_object_get_qdata (GstMiniObject *object, GQuark quark);
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GST_API
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gpointer gst_mini_object_steal_qdata (GstMiniObject *object, GQuark quark);
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GST_API
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void gst_mini_object_add_parent (GstMiniObject *object, GstMiniObject *parent);
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GST_API
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void gst_mini_object_remove_parent (GstMiniObject *object, GstMiniObject *parent);
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GST_API
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gboolean gst_mini_object_replace (GstMiniObject **olddata, GstMiniObject *newdata);
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GST_API
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gboolean gst_mini_object_take (GstMiniObject **olddata, GstMiniObject *newdata);
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GST_API
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GstMiniObject * gst_mini_object_steal (GstMiniObject **olddata) G_GNUC_WARN_UNUSED_RESULT;
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/**
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* GST_DEFINE_MINI_OBJECT_TYPE:
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* @TypeName: name of the new type in CamelCase
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* @type_name: name of the new type
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*
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* Define a new mini-object type with the given name
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*/
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#define GST_DEFINE_MINI_OBJECT_TYPE(TypeName,type_name) \
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G_DEFINE_BOXED_TYPE(TypeName,type_name, \
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(GBoxedCopyFunc) gst_mini_object_ref, \
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(GBoxedFreeFunc) gst_mini_object_unref)
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G_END_DECLS
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#endif
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