author | Pat Downey <patd@symbian.org> |
Wed, 01 Sep 2010 12:16:41 +0100 | |
branch | RCL_3 |
changeset 8 | 7e817e7e631c |
parent 0 | 0e761a78d257 |
permissions | -rw-r--r-- |
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/* GStreamer |
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu> |
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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:gstfilter |
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* @short_description: A utility function to filter GLists. |
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* |
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* <example> |
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* <title>Filtering a list</title> |
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* <programlisting> |
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* GList *node; |
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* GstObject *result = NULL; |
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* |
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* node = gst_filter_run (list, (GstFilterFunc) my_filter, TRUE, NULL); |
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* if (node) { |
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* result = GST_OBJECT (node->data); |
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* gst_object_ref (result); |
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* gst_list_free (node); |
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* } |
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* </programlisting> |
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* </example> |
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*/ |
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#include "gst_private.h" |
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#include <gst/gstfilter.h> |
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|
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/** |
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* gst_filter_run: |
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* @list: a linked list |
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* @func: the function to execute for each item |
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* @first: flag to stop execution after a successful item |
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* @user_data: user data |
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* |
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* Iterates over the elements in @list, calling @func with the |
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* list item data for each item. If @func returns TRUE, @data is |
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* prepended to the list of results returned. If @first is true, |
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* the search is halted after the first result is found. |
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* |
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* Since gst_filter_run() knows nothing about the type of @data, no |
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* reference will be taken (if @data refers to an object) and no copy of |
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* @data wil be made in any other way when prepending @data to the list of |
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* results. |
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* |
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* Returns: the list of results. Free with g_list_free() when no longer needed |
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* (the data contained in the list is a flat copy and does need to be |
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* unreferenced or freed). |
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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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|
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GList * |
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gst_filter_run (const GList * list, GstFilterFunc func, gboolean first, |
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gpointer user_data) |
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{ |
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const GList *walk = list; |
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GList *result = NULL; |
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while (walk) { |
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gboolean res = TRUE; |
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gpointer data = walk->data; |
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walk = g_list_next (walk); |
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if (func) |
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res = func (data, user_data); |
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if (res) { |
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result = g_list_prepend (result, data); |
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|
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if (first) |
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break; |
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} |
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} |
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|
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return result; |
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} |