mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-27 12:11:13 +00:00
ef4fb687a9
Original commit message from CVS: * gst/gstfilter.c: Improve documentation of gst_filter_run(). Fixes #518627.
88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
/* GStreamer
|
|
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
/**
|
|
* SECTION:gstfilter
|
|
* @short_description: A utility function to filter GLists.
|
|
*
|
|
* <example>
|
|
* <title>Filtering a list</title>
|
|
* <programlisting>
|
|
* GList *node;
|
|
* GstObject *result = NULL;
|
|
*
|
|
* node = gst_filter_run (list, (GstFilterFunc) my_filter, TRUE, NULL);
|
|
* if (node) {
|
|
* result = GST_OBJECT (node->data);
|
|
* gst_object_ref (result);
|
|
* gst_list_free (node);
|
|
* }
|
|
* </programlisting>
|
|
* </example>
|
|
*/
|
|
#include "gst_private.h"
|
|
#include <gst/gstfilter.h>
|
|
|
|
/**
|
|
* gst_filter_run:
|
|
* @list: a linked list
|
|
* @func: the function to execute for each item
|
|
* @first: flag to stop execution after a successful item
|
|
* @user_data: user data
|
|
*
|
|
* Iterates over the elements in @list, calling @func with the
|
|
* list item data for each item. If @func returns TRUE, @data is
|
|
* prepended to the list of results returned. If @first is true,
|
|
* the search is halted after the first result is found.
|
|
*
|
|
* Since gst_filter_run() knows nothing about the type of @data, no
|
|
* reference will be taken (if @data refers to an object) and no copy of
|
|
* @data wil be made in any other way when prepending @data to the list of
|
|
* results.
|
|
*
|
|
* Returns: the list of results. Free with g_list_free() when no longer needed
|
|
* (the data contained in the list is a flat copy and does need to be
|
|
* unreferenced or freed).
|
|
*/
|
|
GList *
|
|
gst_filter_run (const GList * list, GstFilterFunc func, gboolean first,
|
|
gpointer user_data)
|
|
{
|
|
const GList *walk = list;
|
|
GList *result = NULL;
|
|
|
|
while (walk) {
|
|
gboolean res = TRUE;
|
|
gpointer data = walk->data;
|
|
|
|
walk = g_list_next (walk);
|
|
|
|
if (func)
|
|
res = func (data, user_data);
|
|
|
|
if (res) {
|
|
result = g_list_prepend (result, data);
|
|
|
|
if (first)
|
|
break;
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|