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: Base class for iterating datastructures. |
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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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|
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/** |
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* SECTION:gstiterator |
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* @short_description: Object to retrieve multiple elements in a threadsafe |
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* way. |
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* @see_also: #GstElement, #GstBin |
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* |
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* A GstIterator is used to retrieve multiple objects from another object in |
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* a threadsafe way. |
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* |
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* Various GStreamer objects provide access to their internal structures using |
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* an iterator. |
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* |
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* The basic use pattern of an iterator is as follows: |
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* |
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* <example> |
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* <title>Using an iterator</title> |
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* <programlisting> |
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* it = _get_iterator(object); |
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* done = FALSE; |
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* while (!done) { |
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* switch (gst_iterator_next (it, &item)) { |
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* case GST_ITERATOR_OK: |
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* ... use/change item here... |
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* gst_object_unref (item); |
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* break; |
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* case GST_ITERATOR_RESYNC: |
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* ...rollback changes to items... |
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* gst_iterator_resync (it); |
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* break; |
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* case GST_ITERATOR_ERROR: |
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* ...wrong parameter were given... |
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* done = TRUE; |
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* break; |
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* case GST_ITERATOR_DONE: |
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* done = TRUE; |
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* break; |
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* } |
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* } |
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* gst_iterator_free (it); |
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* </programlisting> |
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* </example> |
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* |
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* Last reviewed on 2005-11-09 (0.9.4) |
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*/ |
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#include "gst_private.h" |
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#include <gst/gstiterator.h> |
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|
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#ifdef __SYMBIAN32__ |
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#include <glib_global.h> |
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#endif |
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|
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static void |
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gst_iterator_init (GstIterator * it, |
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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, GstIteratorFreeFunction free) |
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{ |
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it->type = type; |
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it->lock = lock; |
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it->master_cookie = master_cookie; |
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it->cookie = *master_cookie; |
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it->next = next; |
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it->item = item; |
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it->resync = resync; |
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it->free = free; |
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it->pushed = NULL; |
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} |
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|
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/** |
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* gst_iterator_new: |
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* @size: the size of the iterator structure |
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* @type: #GType of children |
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* @lock: pointer to a #GMutex. |
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* @master_cookie: pointer to a guint32 to protect the iterated object. |
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* @next: function to get next item |
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* @item: function to call on each item retrieved |
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* @resync: function to resync the iterator |
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* @free: function to free the iterator |
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* |
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* Create a new iterator. This function is mainly used for objects |
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* implementing the next/resync/free function to iterate a data structure. |
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* |
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* For each item retrieved, the @item function is called with the lock |
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* held. The @free function is called when the iterator is freed. |
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* |
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* Returns: the new #GstIterator. |
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* |
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* MT safe. |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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118 |
|
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GstIterator * |
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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, GstIteratorFreeFunction free) |
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127 |
{ |
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GstIterator *result; |
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129 |
|
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g_return_val_if_fail (size >= sizeof (GstIterator), NULL); |
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g_return_val_if_fail (g_type_qname (type) != 0, NULL); |
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g_return_val_if_fail (master_cookie != NULL, NULL); |
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g_return_val_if_fail (next != NULL, NULL); |
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g_return_val_if_fail (resync != NULL, NULL); |
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g_return_val_if_fail (free != NULL, NULL); |
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136 |
|
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result = g_malloc (size); |
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gst_iterator_init (result, type, lock, master_cookie, next, item, resync, |
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free); |
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140 |
|
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return result; |
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} |
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143 |
|
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/* |
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* list iterator |
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*/ |
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typedef struct _GstListIterator |
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{ |
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GstIterator iterator; |
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gpointer owner; |
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GList **orig; |
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GList *list; /* pointer in list */ |
8 | 153 |
GType *type; |
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GstIteratorDisposeFunction freefunc; |
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} GstListIterator; |
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156 |
|
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static GstIteratorResult |
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gst_list_iterator_next (GstListIterator * it, gpointer * elem) |
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159 |
{ |
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if (it->list == NULL) |
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return GST_ITERATOR_DONE; |
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162 |
|
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*elem = it->list->data; |
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it->list = g_list_next (it->list); |
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165 |
|
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return GST_ITERATOR_OK; |
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} |
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168 |
|
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static void |
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gst_list_iterator_resync (GstListIterator * it) |
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171 |
{ |
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it->list = *it->orig; |
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} |
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174 |
|
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static void |
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gst_list_iterator_free (GstListIterator * it) |
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177 |
{ |
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if (it->freefunc) { |
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it->freefunc (it->owner); |
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} |
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g_free (it); |
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} |
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183 |
|
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/** |
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* gst_iterator_new_list: |
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* @type: #GType of elements |
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* @lock: pointer to a #GMutex protecting the list. |
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* @master_cookie: pointer to a guint32 to protect the list. |
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* @list: pointer to the list |
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* @owner: object owning the list |
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* @item: function to call for each item |
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* @free: function to call when the iterator is freed |
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* |
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* Create a new iterator designed for iterating @list. |
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195 |
* |
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* Returns: the new #GstIterator for @list. |
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* |
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* MT safe. |
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*/ |
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#ifdef __SYMBIAN32__ |
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201 |
EXPORT_C |
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#endif |
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203 |
|
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GstIterator * |
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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, GstIteratorDisposeFunction free) |
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211 |
{ |
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GstListIterator *result; |
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213 |
|
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/* no need to lock, nothing can change here */ |
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215 |
result = (GstListIterator *) gst_iterator_new (sizeof (GstListIterator), |
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216 |
type, |
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217 |
lock, |
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218 |
master_cookie, |
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219 |
(GstIteratorNextFunction) gst_list_iterator_next, |
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220 |
(GstIteratorItemFunction) item, |
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221 |
(GstIteratorResyncFunction) gst_list_iterator_resync, |
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222 |
(GstIteratorFreeFunction) gst_list_iterator_free); |
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223 |
|
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224 |
result->owner = owner; |
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|
225 |
result->orig = list; |
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|
226 |
result->list = *list; |
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227 |
result->freefunc = free; |
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228 |
|
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229 |
return GST_ITERATOR (result); |
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230 |
} |
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231 |
|
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232 |
static void |
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233 |
gst_iterator_pop (GstIterator * it) |
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234 |
{ |
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235 |
if (it->pushed) { |
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236 |
gst_iterator_free (it->pushed); |
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237 |
it->pushed = NULL; |
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238 |
} |
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239 |
} |
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240 |
|
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241 |
/** |
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242 |
* gst_iterator_next: |
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243 |
* @it: The #GstIterator to iterate |
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244 |
* @elem: pointer to hold next element |
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245 |
* |
8 | 246 |
* Get the next item from the iterator. For iterators that return |
247 |
* refcounted objects, the returned object will have its refcount |
|
248 |
* increased and should therefore be unreffed after usage. |
|
0
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249 |
* |
8 | 250 |
* Returns: The result of the iteration. Unref after usage if this is |
251 |
* a refcounted object. |
|
0
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252 |
* |
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253 |
* MT safe. |
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|
254 |
*/ |
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|
255 |
#ifdef __SYMBIAN32__ |
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256 |
EXPORT_C |
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|
257 |
#endif |
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|
258 |
|
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|
259 |
GstIteratorResult |
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260 |
gst_iterator_next (GstIterator * it, gpointer * elem) |
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|
261 |
{ |
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262 |
GstIteratorResult result; |
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|
263 |
|
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|
264 |
g_return_val_if_fail (it != NULL, GST_ITERATOR_ERROR); |
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|
265 |
g_return_val_if_fail (elem != NULL, GST_ITERATOR_ERROR); |
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|
266 |
|
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|
267 |
restart: |
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|
268 |
if (it->pushed) { |
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|
269 |
result = gst_iterator_next (it->pushed, elem); |
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|
270 |
if (result == GST_ITERATOR_DONE) { |
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|
271 |
/* we are done with this iterator, pop it and |
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|
272 |
* fallthrough iterating the main iterator again. */ |
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|
273 |
gst_iterator_pop (it); |
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|
274 |
} else { |
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275 |
return result; |
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|
276 |
} |
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|
277 |
} |
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|
278 |
|
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279 |
if (G_LIKELY (it->lock)) |
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|
280 |
g_mutex_lock (it->lock); |
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|
281 |
|
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|
282 |
if (G_UNLIKELY (*it->master_cookie != it->cookie)) { |
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|
283 |
result = GST_ITERATOR_RESYNC; |
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|
284 |
goto done; |
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|
285 |
} |
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|
286 |
|
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|
287 |
result = it->next (it, elem); |
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|
288 |
if (result == GST_ITERATOR_OK && it->item) { |
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|
289 |
GstIteratorItem itemres; |
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|
290 |
|
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|
291 |
itemres = it->item (it, *elem); |
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|
292 |
switch (itemres) { |
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|
293 |
case GST_ITERATOR_ITEM_SKIP: |
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|
294 |
if (G_LIKELY (it->lock)) |
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|
295 |
g_mutex_unlock (it->lock); |
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Revision: 200949
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|
296 |
goto restart; |
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|
297 |
case GST_ITERATOR_ITEM_END: |
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|
298 |
result = GST_ITERATOR_DONE; |
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|
299 |
break; |
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|
300 |
case GST_ITERATOR_ITEM_PASS: |
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|
301 |
break; |
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|
302 |
} |
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|
303 |
} |
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|
304 |
|
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|
305 |
done: |
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|
306 |
if (G_LIKELY (it->lock)) |
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|
307 |
g_mutex_unlock (it->lock); |
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|
308 |
|
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|
309 |
return result; |
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|
310 |
} |
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|
311 |
|
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|
312 |
/** |
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|
313 |
* gst_iterator_resync: |
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Revision: 200949
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|
314 |
* @it: The #GstIterator to resync |
0e761a78d257
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|
315 |
* |
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diff
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|
316 |
* Resync the iterator. this function is mostly called |
0e761a78d257
Revision: 200949
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|
317 |
* after gst_iterator_next() returned %GST_ITERATOR_RESYNC. |
0e761a78d257
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|
318 |
* |
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|
319 |
* MT safe. |
0e761a78d257
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|
320 |
*/ |
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diff
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|
321 |
#ifdef __SYMBIAN32__ |
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|
322 |
EXPORT_C |
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|
323 |
#endif |
0e761a78d257
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|
324 |
|
0e761a78d257
Revision: 200949
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|
325 |
void |
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diff
changeset
|
326 |
gst_iterator_resync (GstIterator * it) |
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|
327 |
{ |
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|
328 |
g_return_if_fail (it != NULL); |
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|
329 |
|
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|
330 |
gst_iterator_pop (it); |
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|
331 |
|
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|
332 |
if (G_LIKELY (it->lock)) |
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|
333 |
g_mutex_lock (it->lock); |
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|
334 |
it->resync (it); |
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|
335 |
it->cookie = *it->master_cookie; |
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|
336 |
if (G_LIKELY (it->lock)) |
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|
337 |
g_mutex_unlock (it->lock); |
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|
338 |
} |
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|
339 |
|
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|
340 |
/** |
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|
341 |
* gst_iterator_free: |
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|
342 |
* @it: The #GstIterator to free |
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|
343 |
* |
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|
344 |
* Free the iterator. |
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|
345 |
* |
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|
346 |
* MT safe. |
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|
347 |
*/ |
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|
348 |
#ifdef __SYMBIAN32__ |
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|
349 |
EXPORT_C |
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|
350 |
#endif |
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|
351 |
|
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|
352 |
void |
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|
353 |
gst_iterator_free (GstIterator * it) |
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|
354 |
{ |
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|
355 |
g_return_if_fail (it != NULL); |
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|
356 |
|
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|
357 |
gst_iterator_pop (it); |
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|
358 |
|
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|
359 |
it->free (it); |
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|
360 |
} |
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|
361 |
|
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|
362 |
/** |
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|
363 |
* gst_iterator_push: |
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|
364 |
* @it: The #GstIterator to use |
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|
365 |
* @other: The #GstIterator to push |
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diff
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|
366 |
* |
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|
367 |
* Pushes @other iterator onto @it. All calls performed on @it are |
8 | 368 |
* forwarded tot @other. If @other returns #GST_ITERATOR_DONE, it is |
0
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diff
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|
369 |
* popped again and calls are handled by @it again. |
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|
370 |
* |
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diff
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|
371 |
* This function is mainly used by objects implementing the iterator |
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parents:
diff
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|
372 |
* next function to recurse into substructures. |
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diff
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|
373 |
* |
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|
374 |
* MT safe. |
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diff
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|
375 |
*/ |
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changeset
|
376 |
#ifdef __SYMBIAN32__ |
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|
377 |
EXPORT_C |
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|
378 |
#endif |
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changeset
|
379 |
|
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|
380 |
void |
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|
381 |
gst_iterator_push (GstIterator * it, GstIterator * other) |
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diff
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|
382 |
{ |
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diff
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|
383 |
g_return_if_fail (it != NULL); |
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diff
changeset
|
384 |
g_return_if_fail (other != NULL); |
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parents:
diff
changeset
|
385 |
|
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Revision: 200949
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diff
changeset
|
386 |
it->pushed = other; |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
387 |
} |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
388 |
|
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Revision: 200949
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parents:
diff
changeset
|
389 |
typedef struct _GstIteratorFilter |
0e761a78d257
Revision: 200949
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diff
changeset
|
390 |
{ |
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Revision: 200949
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diff
changeset
|
391 |
GstIterator iterator; |
0e761a78d257
Revision: 200949
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diff
changeset
|
392 |
GstIterator *slave; |
0e761a78d257
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diff
changeset
|
393 |
|
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
394 |
GCompareFunc func; |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
395 |
gpointer user_data; |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
396 |
} GstIteratorFilter; |
0e761a78d257
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parents:
diff
changeset
|
397 |
|
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Revision: 200949
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|
398 |
static GstIteratorResult |
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diff
changeset
|
399 |
filter_next (GstIteratorFilter * it, gpointer * elem) |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
400 |
{ |
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Revision: 200949
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diff
changeset
|
401 |
GstIteratorResult result = GST_ITERATOR_ERROR; |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
402 |
gboolean done = FALSE; |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
403 |
|
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
404 |
*elem = NULL; |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
405 |
|
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
406 |
while (G_LIKELY (!done)) { |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
407 |
gpointer item; |
0e761a78d257
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parents:
diff
changeset
|
408 |
|
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
409 |
result = gst_iterator_next (it->slave, &item); |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
410 |
switch (result) { |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
411 |
case GST_ITERATOR_OK: |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
412 |
if (G_LIKELY (GST_ITERATOR (it)->lock)) |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
413 |
g_mutex_unlock (GST_ITERATOR (it)->lock); |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
414 |
if (it->func (item, it->user_data) == 0) { |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
415 |
*elem = item; |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
416 |
done = TRUE; |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
417 |
} |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
418 |
if (G_LIKELY (GST_ITERATOR (it)->lock)) |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
419 |
g_mutex_lock (GST_ITERATOR (it)->lock); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
420 |
break; |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
421 |
case GST_ITERATOR_RESYNC: |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
422 |
case GST_ITERATOR_DONE: |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
423 |
done = TRUE; |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
424 |
break; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
425 |
default: |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
426 |
g_assert_not_reached (); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
427 |
break; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
428 |
} |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
429 |
} |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
430 |
return result; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
431 |
} |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
432 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
433 |
static void |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
434 |
filter_resync (GstIteratorFilter * it) |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
435 |
{ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
436 |
gst_iterator_resync (it->slave); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
437 |
} |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
438 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
439 |
static void |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
440 |
filter_uninit (GstIteratorFilter * it) |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
441 |
{ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
442 |
it->slave->lock = GST_ITERATOR (it)->lock; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
443 |
} |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
444 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
445 |
static void |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
446 |
filter_free (GstIteratorFilter * it) |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
447 |
{ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
448 |
filter_uninit (it); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
449 |
gst_iterator_free (it->slave); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
450 |
g_free (it); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
451 |
} |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
452 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
453 |
/** |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
454 |
* gst_iterator_filter: |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
455 |
* @it: The #GstIterator to filter |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
456 |
* @func: the compare function to select elements |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
457 |
* @user_data: user data passed to the compare function |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
458 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
459 |
* Create a new iterator from an existing iterator. The new iterator |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
460 |
* will only return those elements that match the given compare function @func. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
461 |
* @func should return 0 for elements that should be included |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
462 |
* in the iterator. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
463 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
464 |
* When this iterator is freed, @it will also be freed. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
465 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
466 |
* Returns: a new #GstIterator. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
467 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
468 |
* MT safe. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
469 |
*/ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
470 |
#ifdef __SYMBIAN32__ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
471 |
EXPORT_C |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
472 |
#endif |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
473 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
474 |
GstIterator * |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
475 |
gst_iterator_filter (GstIterator * it, GCompareFunc func, gpointer user_data) |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
476 |
{ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
477 |
GstIteratorFilter *result; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
478 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
479 |
g_return_val_if_fail (it != NULL, NULL); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
480 |
g_return_val_if_fail (func != NULL, NULL); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
481 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
482 |
result = (GstIteratorFilter *) gst_iterator_new (sizeof (GstIteratorFilter), |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
483 |
it->type, it->lock, it->master_cookie, |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
484 |
(GstIteratorNextFunction) filter_next, |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
485 |
(GstIteratorItemFunction) NULL, |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
486 |
(GstIteratorResyncFunction) filter_resync, |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
487 |
(GstIteratorFreeFunction) filter_free); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
488 |
it->lock = NULL; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
489 |
result->func = func; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
490 |
result->user_data = user_data; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
491 |
result->slave = it; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
492 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
493 |
return GST_ITERATOR (result); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
494 |
} |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
495 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
496 |
/** |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
497 |
* gst_iterator_fold: |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
498 |
* @it: The #GstIterator to fold over |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
499 |
* @func: the fold function |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
500 |
* @ret: the seed value passed to the fold function |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
501 |
* @user_data: user data passed to the fold function |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
502 |
* |
8 | 503 |
* Folds @func over the elements of @iter. That is to say, @proc will be called |
504 |
* as @proc (object, @ret, @user_data) for each object in @iter. The normal use |
|
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
505 |
* of this procedure is to accumulate the results of operating on the objects in |
8 | 506 |
* @ret. |
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
507 |
* |
8 | 508 |
* This procedure can be used (and is used internally) to implement the foreach |
509 |
* and find_custom operations. |
|
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
510 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
511 |
* The fold will proceed as long as @func returns TRUE. When the iterator has no |
8 | 512 |
* more arguments, #GST_ITERATOR_DONE will be returned. If @func returns FALSE, |
513 |
* the fold will stop, and #GST_ITERATOR_OK will be returned. Errors or resyncs |
|
514 |
* will cause fold to return #GST_ITERATOR_ERROR or #GST_ITERATOR_RESYNC as |
|
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
515 |
* appropriate. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
516 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
517 |
* The iterator will not be freed. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
518 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
519 |
* Returns: A #GstIteratorResult, as described above. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
520 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
521 |
* MT safe. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
522 |
*/ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
523 |
#ifdef __SYMBIAN32__ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
524 |
EXPORT_C |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
525 |
#endif |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
526 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
527 |
GstIteratorResult |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
528 |
gst_iterator_fold (GstIterator * it, GstIteratorFoldFunction func, |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
529 |
GValue * ret, gpointer user_data) |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
530 |
{ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
531 |
gpointer item; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
532 |
GstIteratorResult result; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
533 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
534 |
while (1) { |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
535 |
result = gst_iterator_next (it, &item); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
536 |
switch (result) { |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
537 |
case GST_ITERATOR_OK: |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
538 |
/* FIXME: is there a way to ref/unref items? */ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
539 |
if (!func (item, ret, user_data)) |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
540 |
goto fold_done; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
541 |
else |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
542 |
break; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
543 |
case GST_ITERATOR_RESYNC: |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
544 |
case GST_ITERATOR_ERROR: |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
545 |
goto fold_done; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
546 |
case GST_ITERATOR_DONE: |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
547 |
goto fold_done; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
548 |
} |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
549 |
} |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
550 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
551 |
fold_done: |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
552 |
return result; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
553 |
} |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
554 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
555 |
typedef struct |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
556 |
{ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
557 |
GFunc func; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
558 |
gpointer user_data; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
559 |
} ForeachFoldData; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
560 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
561 |
static gboolean |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
562 |
foreach_fold_func (gpointer item, GValue * unused, ForeachFoldData * data) |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
563 |
{ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
564 |
data->func (item, data->user_data); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
565 |
return TRUE; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
566 |
} |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
567 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
568 |
/** |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
569 |
* gst_iterator_foreach: |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
570 |
* @it: The #GstIterator to iterate |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
571 |
* @func: the function to call for each element. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
572 |
* @user_data: user data passed to the function |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
573 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
574 |
* Iterate over all element of @it and call the given function @func for |
8 | 575 |
* each element. |
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
576 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
577 |
* Returns: the result call to gst_iterator_fold(). The iterator will not be |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
578 |
* freed. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
579 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
580 |
* MT safe. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
581 |
*/ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
582 |
#ifdef __SYMBIAN32__ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
583 |
EXPORT_C |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
584 |
#endif |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
585 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
586 |
GstIteratorResult |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
587 |
gst_iterator_foreach (GstIterator * it, GFunc func, gpointer user_data) |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
588 |
{ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
589 |
ForeachFoldData data; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
590 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
591 |
data.func = func; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
592 |
data.user_data = user_data; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
593 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
594 |
return gst_iterator_fold (it, (GstIteratorFoldFunction) foreach_fold_func, |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
595 |
NULL, &data); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
596 |
} |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
597 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
598 |
typedef struct |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
599 |
{ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
600 |
GCompareFunc func; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
601 |
gpointer user_data; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
602 |
} FindCustomFoldData; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
603 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
604 |
static gboolean |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
605 |
find_custom_fold_func (gpointer item, GValue * ret, FindCustomFoldData * data) |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
606 |
{ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
607 |
if (data->func (item, data->user_data) == 0) { |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
608 |
g_value_set_pointer (ret, item); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
609 |
return FALSE; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
610 |
} else { |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
611 |
return TRUE; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
612 |
} |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
613 |
} |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
614 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
615 |
/** |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
616 |
* gst_iterator_find_custom: |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
617 |
* @it: The #GstIterator to iterate |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
618 |
* @func: the compare function to use |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
619 |
* @user_data: user data passed to the compare function |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
620 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
621 |
* Find the first element in @it that matches the compare function @func. |
8 | 622 |
* @func should return 0 when the element is found. |
0
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
623 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
624 |
* The iterator will not be freed. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
625 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
626 |
* This function will return NULL if an error or resync happened to |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
627 |
* the iterator. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
628 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
629 |
* Returns: The element in the iterator that matches the compare |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
630 |
* function or NULL when no element matched. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
631 |
* |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
632 |
* MT safe. |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
633 |
*/ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
634 |
#ifdef __SYMBIAN32__ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
635 |
EXPORT_C |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
636 |
#endif |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
637 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
638 |
gpointer |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
639 |
gst_iterator_find_custom (GstIterator * it, GCompareFunc func, |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
640 |
gpointer user_data) |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
641 |
{ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
642 |
GValue ret = { 0, }; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
643 |
GstIteratorResult res; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
644 |
FindCustomFoldData data; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
645 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
646 |
g_value_init (&ret, G_TYPE_POINTER); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
647 |
data.func = func; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
648 |
data.user_data = user_data; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
649 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
650 |
/* FIXME, we totally ignore RESYNC and return NULL so that the |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
651 |
* app does not know if the element was not found or a resync happened */ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
652 |
res = |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
653 |
gst_iterator_fold (it, (GstIteratorFoldFunction) find_custom_fold_func, |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
654 |
&ret, &data); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
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655 |
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0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
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656 |
/* no need to unset, it's just a pointer */ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
657 |
return g_value_get_pointer (&ret); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
658 |
} |