author | Pat Downey <patd@symbian.org> |
Wed, 01 Sep 2010 12:16:41 +0100 | |
branch | RCL_3 |
changeset 30 | 7e817e7e631c |
parent 29 | 567bb019e3e3 |
permissions | -rw-r--r-- |
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/* GStreamer |
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* Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de> |
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* |
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* gsttypefindfactory.c: typefinding subsystem |
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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:gsttypefindfactory |
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* @short_description: Information about registered typefind functions |
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* |
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* These functions allow querying informations about registered typefind |
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* functions. How to create and register these functions is described in |
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* the section <link linkend="gstreamer-Writing-typefind-functions"> |
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* "Writing typefind functions"</link>. |
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* |
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* <example> |
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* <title>how to write a simple typefinder</title> |
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* <programlisting> |
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* typedef struct { |
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* guint8 *data; |
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* guint size; |
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* guint probability; |
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* GstCaps *data; |
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* } MyTypeFind; |
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* static void |
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* my_peek (gpointer data, gint64 offset, guint size) |
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* { |
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* MyTypeFind *find = (MyTypeFind *) data; |
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* if (offset >= 0 && offset + size <= find->size) { |
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* return find->data + offset; |
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* } |
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* return NULL; |
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* } |
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* static void |
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* my_suggest (gpointer data, guint probability, GstCaps *caps) |
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* { |
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* MyTypeFind *find = (MyTypeFind *) data; |
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* if (probability > find->probability) { |
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* find->probability = probability; |
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* gst_caps_replace (&find->caps, caps); |
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* } |
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* } |
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* static GstCaps * |
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* find_type (guint8 *data, guint size) |
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* { |
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* GList *walk, *type_list; |
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* MyTypeFind find = {data, size, 0, NULL}; |
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* GstTypeFind gst_find = {my_peek, my_suggest, &find, }; |
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* walk = type_list = gst_type_find_factory_get_list (); |
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* while (walk) { |
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* GstTypeFindFactory *factory = GST_TYPE_FIND_FACTORY (walk->data); |
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* walk = g_list_next (walk) |
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* gst_type_find_factory_call_function (factory, &gst_find); |
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* } |
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* g_list_free (type_list); |
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* return find.caps; |
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* }; |
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* </programlisting> |
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* </example> |
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* |
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* The above example shows how to write a very simple typefinder that |
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* identifies the given data. You can get quite a bit more complicated than |
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* that though. |
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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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|
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#include "gst_private.h" |
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#include "gstinfo.h" |
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#include "gsttypefind.h" |
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#include "gsttypefindfactory.h" |
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#include "gstregistry.h" |
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GST_DEBUG_CATEGORY (type_find_debug); |
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#define GST_CAT_DEFAULT type_find_debug |
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static void gst_type_find_factory_class_init (gpointer g_class, |
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gpointer class_data); |
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static void gst_type_find_factory_init (GTypeInstance * instance, |
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gpointer g_class); |
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static void gst_type_find_factory_dispose (GObject * object); |
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static GstPluginFeatureClass *parent_class = NULL; |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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GType |
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gst_type_find_factory_get_type (void) |
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{ |
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static GType typefind_type = 0; |
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if (G_UNLIKELY (typefind_type == 0)) { |
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static const GTypeInfo typefind_info = { |
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sizeof (GstTypeFindFactoryClass), |
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NULL, |
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NULL, |
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gst_type_find_factory_class_init, |
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NULL, |
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NULL, |
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sizeof (GstTypeFindFactory), |
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0, |
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gst_type_find_factory_init, |
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NULL |
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}; |
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typefind_type = g_type_register_static (GST_TYPE_PLUGIN_FEATURE, |
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"GstTypeFindFactory", &typefind_info, 0); |
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GST_DEBUG_CATEGORY_INIT (type_find_debug, "GST_TYPEFIND", |
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GST_DEBUG_FG_GREEN, "typefinding subsystem"); |
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} |
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return typefind_type; |
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} |
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static void |
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gst_type_find_factory_class_init (gpointer g_class, gpointer class_data) |
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{ |
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GObjectClass *object_class = G_OBJECT_CLASS (g_class); |
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parent_class = g_type_class_peek_parent (g_class); |
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object_class->dispose = gst_type_find_factory_dispose; |
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} |
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static void |
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gst_type_find_factory_init (GTypeInstance * instance, gpointer g_class) |
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{ |
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GstTypeFindFactory *factory = GST_TYPE_FIND_FACTORY (instance); |
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factory->user_data = factory; |
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factory->user_data_notify = NULL; |
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} |
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static void |
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gst_type_find_factory_dispose (GObject * object) |
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{ |
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GstTypeFindFactory *factory = GST_TYPE_FIND_FACTORY (object); |
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if (factory->caps) { |
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gst_caps_unref (factory->caps); |
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factory->caps = NULL; |
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} |
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if (factory->extensions) { |
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g_strfreev (factory->extensions); |
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factory->extensions = NULL; |
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} |
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if (factory->user_data_notify && factory->user_data) { |
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factory->user_data_notify (factory->user_data); |
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factory->user_data = NULL; |
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} |
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|
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G_OBJECT_CLASS (parent_class)->dispose (object); |
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} |
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|
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/** |
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* gst_type_find_factory_get_list: |
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* |
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* Gets the list of all registered typefind factories. You must free the |
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* list using gst_plugin_feature_list_free. |
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* |
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* Returns: the list of all registered #GstTypeFindFactory. |
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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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GList * |
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gst_type_find_factory_get_list (void) |
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{ |
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return gst_registry_get_feature_list (gst_registry_get_default (), |
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GST_TYPE_TYPE_FIND_FACTORY); |
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} |
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|
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/** |
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* gst_type_find_factory_get_caps: |
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* @factory: A #GstTypeFindFactory |
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* |
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* Gets the #GstCaps associated with a typefind factory. |
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* |
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* Returns: The #GstCaps associated with this factory |
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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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GstCaps * |
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gst_type_find_factory_get_caps (GstTypeFindFactory * factory) |
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{ |
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g_return_val_if_fail (GST_IS_TYPE_FIND_FACTORY (factory), NULL); |
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|
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return factory->caps; |
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} |
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|
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/** |
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* gst_type_find_factory_get_extensions: |
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* @factory: A #GstTypeFindFactory |
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* |
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* Gets the extensions associated with a #GstTypeFindFactory. The returned |
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* array should not be changed. If you need to change stuff in it, you should |
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* copy it using g_stdupv(). This function may return NULL to indicate |
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* a 0-length list. |
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* |
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* Returns: a NULL-terminated array of extensions associated with this factory |
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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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gchar ** |
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gst_type_find_factory_get_extensions (GstTypeFindFactory * factory) |
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{ |
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g_return_val_if_fail (GST_IS_TYPE_FIND_FACTORY (factory), NULL); |
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|
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return factory->extensions; |
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} |
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|
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/** |
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* gst_type_find_factory_call_function: |
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* @factory: A #GstTypeFindFactory |
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* @find: A properly setup #GstTypeFind entry. The get_data and suggest_type |
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* members must be set. |
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* |
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* Calls the #GstTypeFindFunction associated with this factory. |
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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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void |
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gst_type_find_factory_call_function (GstTypeFindFactory * factory, |
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GstTypeFind * find) |
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{ |
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GstTypeFindFactory *new_factory; |
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g_return_if_fail (GST_IS_TYPE_FIND_FACTORY (factory)); |
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g_return_if_fail (find != NULL); |
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g_return_if_fail (find->peek != NULL); |
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g_return_if_fail (find->suggest != NULL); |
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new_factory = |
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GST_TYPE_FIND_FACTORY (gst_plugin_feature_load (GST_PLUGIN_FEATURE |
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(factory))); |
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if (new_factory) { |
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g_assert (new_factory->function != NULL); |
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new_factory->function (find, new_factory->user_data); |
|
0
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gst_object_unref (new_factory); |
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} |
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} |