author | Pat Downey <patd@symbian.org> |
Wed, 01 Sep 2010 12:16:41 +0100 | |
branch | RCL_3 |
changeset 8 | 7e817e7e631c |
parent 7 | 567bb019e3e3 |
permissions | -rw-r--r-- |
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/* GStreamer |
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* Copyright (C) 2004 Wim Taymans <wim@fluendo.com> |
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* |
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* gstiterator.h: Header for GstIterator |
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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_ITERATOR_H__ |
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#define __GST_ITERATOR_H__ |
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#include <glib-object.h> /* for GValue in the fold */ |
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#include <gst/gstconfig.h> |
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G_BEGIN_DECLS |
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/** |
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* GstIteratorResult: |
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* @GST_ITERATOR_DONE: No more items in the iterator |
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* @GST_ITERATOR_OK: An item was retrieved |
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* @GST_ITERATOR_RESYNC: Datastructure changed while iterating |
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* @GST_ITERATOR_ERROR: An error happened |
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* |
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* The result of gst_iterator_next(). |
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*/ |
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typedef enum { |
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GST_ITERATOR_DONE = 0, |
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GST_ITERATOR_OK = 1, |
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GST_ITERATOR_RESYNC = 2, |
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GST_ITERATOR_ERROR = 3 |
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} GstIteratorResult; |
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typedef struct _GstIterator GstIterator; |
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/** |
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* GstIteratorItem: |
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* @GST_ITERATOR_ITEM_SKIP: Skip this item |
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* @GST_ITERATOR_ITEM_PASS: Return item |
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* @GST_ITERATOR_ITEM_END: Stop after this item. |
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* |
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* The result of a GstIteratorItemFunction. |
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*/ |
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typedef enum { |
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GST_ITERATOR_ITEM_SKIP = 0, |
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GST_ITERATOR_ITEM_PASS = 1, |
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GST_ITERATOR_ITEM_END = 2 |
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} GstIteratorItem; |
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/** |
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* GstIteratorDisposeFunction: |
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* @owner: the owner of the iterator |
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* |
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* The function that will be called when a GList iterator is freed. The |
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* owner of the GList iterator can then clean up its resources. |
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*/ |
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typedef void (*GstIteratorDisposeFunction) (gpointer owner); |
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/** |
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* GstIteratorNextFunction: |
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* @it: the iterator |
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* @result: a pointer to hold the next item |
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* |
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* The function that will be called when the next element of the iterator |
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* should be retrieved. |
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* |
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* Implementors of a #GstIterator should implement this |
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* function and pass it to the constructor of the custom iterator. |
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* The function will be called with the iterator lock held. |
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* |
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* Returns: the result of the operation. |
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*/ |
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typedef GstIteratorResult (*GstIteratorNextFunction) (GstIterator *it, gpointer *result); |
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/** |
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* GstIteratorItemFunction: |
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* @it: the iterator |
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* @item: the item being retrieved. |
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* |
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* The function that will be called after the next item of the iterator |
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* has been retrieved. This function will typically increase the refcount |
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* of the item or make a copy. |
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* |
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* Implementors of a #GstIterator should implement this |
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* function and pass it to the constructor of the custom iterator. |
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* The function will be called with the iterator lock held. |
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* |
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* Returns: the result of the operation. |
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*/ |
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typedef GstIteratorItem (*GstIteratorItemFunction) (GstIterator *it, gpointer item); |
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/** |
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* GstIteratorResyncFunction: |
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* @it: the iterator |
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* |
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* This function will be called whenever a concurrent update happened |
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* to the iterated datastructure. The implementor of the iterator should |
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* restart the iterator from the beginning and clean up any state it might |
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* have. |
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* |
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* Implementors of a #GstIterator should implement this |
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* function and pass it to the constructor of the custom iterator. |
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* The function will be called with the iterator lock held. |
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*/ |
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typedef void (*GstIteratorResyncFunction) (GstIterator *it); |
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/** |
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* GstIteratorFreeFunction: |
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* @it: the iterator |
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* |
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* This function will be called when the iterator is freed. |
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* |
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* Implementors of a #GstIterator should implement this |
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* function and pass it to the constructor of the custom iterator. |
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* The function will be called with the iterator lock held. |
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*/ |
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typedef void (*GstIteratorFreeFunction) (GstIterator *it); |
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|
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/** |
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* GstIteratorFoldFunction: |
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* @item: the item to fold |
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* @ret: a GValue collecting the result |
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* @user_data: data passed to gst_iterator_fold() |
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* |
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* A function to be passed to gst_iterator_fold(). |
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* |
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* Returns: TRUE if the fold should continue, FALSE if it should stop. |
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*/ |
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typedef gboolean (*GstIteratorFoldFunction) (gpointer item, GValue *ret, gpointer user_data); |
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|
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/** |
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* GST_ITERATOR: |
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* @it: the #GstIterator value |
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* |
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* Macro to cast to a #GstIterator |
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*/ |
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#define GST_ITERATOR(it) ((GstIterator*)(it)) |
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/** |
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* GST_ITERATOR_LOCK: |
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* @it: the #GstIterator to get the lock of |
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* |
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* Macro to get the lock protecting the datastructure being iterated. |
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*/ |
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#define GST_ITERATOR_LOCK(it) (GST_ITERATOR(it)->lock) |
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/** |
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* GST_ITERATOR_COOKIE: |
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* @it: the #GstIterator to get the cookie of |
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* |
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* Macro to get the cookie of a #GstIterator. The cookie of the |
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* iterator is the value of the master cookie when the iterator |
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* was created. |
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* Whenever the iterator is iterated, the value is compared to the |
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* value of the master cookie. If they are different, a concurrent |
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* modification happened to the iterator and a resync is needed. |
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*/ |
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#define GST_ITERATOR_COOKIE(it) (GST_ITERATOR(it)->cookie) |
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/** |
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* GST_ITERATOR_ORIG_COOKIE: |
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* @it: the #GstIterator to get the master cookie of |
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* |
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* Macro to get a pointer to where the master cookie is stored. The |
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* master cookie protects the structure being iterated and gets updated |
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* whenever the datastructure changes. |
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*/ |
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#define GST_ITERATOR_ORIG_COOKIE(it) (GST_ITERATOR(it)->master_cookie) |
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|
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/** |
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* GstIterator: |
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* @next: The function to get the next item in the iterator |
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* @item: The function to be called for each item retrieved |
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* @resync: The function to call when a resync is needed. |
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* @free: The function to call when the iterator is freed |
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* @pushed: The iterator that is currently pushed with gst_iterator_push() |
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* @type: The type of the object that this iterator will return |
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* @lock: The lock protecting the data structure and the cookie. |
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* @cookie: The cookie; the value of the master_cookie when this iterator was |
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* created. |
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* @master_cookie: A pointer to the master cookie. |
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* |
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* GstIterator base structure. The values of this structure are |
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* protected for subclasses, use the methods to use the #GstIterator. |
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*/ |
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struct _GstIterator { |
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/*< protected >*/ |
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GstIteratorNextFunction next; |
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GstIteratorItemFunction item; |
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GstIteratorResyncFunction resync; |
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GstIteratorFreeFunction free; |
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|
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GstIterator *pushed; /* pushed iterator */ |
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|
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GType type; |
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GMutex *lock; |
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guint32 cookie; /* cookie of the iterator */ |
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guint32 *master_cookie; /* pointer to guint32 holding the cookie when this |
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iterator was created */ |
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|
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/*< private >*/ |
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gpointer _gst_reserved[GST_PADDING]; |
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}; |
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|
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/* creating iterators */ |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GstIterator* gst_iterator_new (guint size, |
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GType type, |
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GMutex *lock, |
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guint32 *master_cookie, |
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GstIteratorNextFunction next, |
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GstIteratorItemFunction item, |
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GstIteratorResyncFunction resync, |
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GstIteratorFreeFunction free); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GstIterator* gst_iterator_new_list (GType type, |
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GMutex *lock, |
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guint32 *master_cookie, |
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GList **list, |
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gpointer owner, |
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GstIteratorItemFunction item, |
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GstIteratorDisposeFunction free); |
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/* using iterators */ |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GstIteratorResult gst_iterator_next (GstIterator *it, gpointer *elem); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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void gst_iterator_resync (GstIterator *it); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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void gst_iterator_free (GstIterator *it); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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void gst_iterator_push (GstIterator *it, GstIterator *other); |
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/* higher-order functions that operate on iterators */ |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GstIterator* gst_iterator_filter (GstIterator *it, GCompareFunc func, |
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gpointer user_data); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GstIteratorResult gst_iterator_fold (GstIterator *it, |
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GstIteratorFoldFunction func, |
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GValue *ret, gpointer user_data); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GstIteratorResult gst_iterator_foreach (GstIterator *it, |
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GFunc func, gpointer user_data); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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gpointer gst_iterator_find_custom (GstIterator *it, GCompareFunc func, |
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gpointer user_data); |
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G_END_DECLS |
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#endif /* __GST_ITERATOR_H__ */ |