author | hgs |
Fri, 30 Apr 2010 19:11:56 -0500 | |
changeset 19 | 24ed0baaf8e5 |
parent 16 | 8e837d1bf446 |
child 30 | 7e817e7e631c |
permissions | -rw-r--r-- |
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/* GStreamer |
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu> |
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* 2000 Wim Taymans <wtay@chello.be> |
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* |
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* gstpluginfeature.c: Abstract base class for all plugin features |
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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:gstpluginfeature |
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* @short_description: Base class for contents of a GstPlugin |
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* @see_also: #GstPlugin |
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* |
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* This is a base class for anything that can be added to a #GstPlugin. |
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*/ |
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#include "gst_private.h" |
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#include "gstpluginfeature.h" |
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#include "gstplugin.h" |
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#include "gstregistry.h" |
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#include "gstinfo.h" |
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#include <string.h> |
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#define GST_CAT_DEFAULT GST_CAT_PLUGIN_LOADING |
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static void gst_plugin_feature_finalize (GObject * object); |
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/* static guint gst_plugin_feature_signals[LAST_SIGNAL] = { 0 }; */ |
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G_DEFINE_ABSTRACT_TYPE (GstPluginFeature, gst_plugin_feature, GST_TYPE_OBJECT); |
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static GstObjectClass *parent_class = NULL; |
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static void |
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gst_plugin_feature_class_init (GstPluginFeatureClass * klass) |
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{ |
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parent_class = g_type_class_peek_parent (klass); |
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G_OBJECT_CLASS (klass)->finalize = |
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GST_DEBUG_FUNCPTR (gst_plugin_feature_finalize); |
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} |
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static void |
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gst_plugin_feature_init (GstPluginFeature * feature) |
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{ |
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/* do nothing, needed because of G_DEFINE_TYPE */ |
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} |
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static void |
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gst_plugin_feature_finalize (GObject * object) |
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{ |
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GstPluginFeature *feature = GST_PLUGIN_FEATURE_CAST (object); |
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GST_DEBUG ("finalizing feature %p: '%s'", feature, |
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GST_PLUGIN_FEATURE_NAME (feature)); |
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g_free (feature->name); |
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G_OBJECT_CLASS (parent_class)->finalize (object); |
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} |
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/** |
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* gst_plugin_feature_load: |
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* @feature: the plugin feature to check |
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* |
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* Loads the plugin containing @feature if it's not already loaded. @feature is |
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* unaffected; use the return value instead. |
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* |
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* Normally this function is used like this: |
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* |[ |
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* GstPluginFeature *loaded_feature; |
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* |
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* loaded_feature = gst_plugin_feature_load (feature); |
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* // presumably, we're no longer interested in the potentially-unloaded feature |
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* gst_object_unref (feature); |
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* feature = loaded_feature; |
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* ]| |
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* |
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* Returns: A reference to the loaded feature, or NULL on error. |
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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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GstPluginFeature * |
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gst_plugin_feature_load (GstPluginFeature * feature) |
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{ |
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GstPlugin *plugin; |
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GstPluginFeature *real_feature; |
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g_return_val_if_fail (feature != NULL, FALSE); |
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g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), FALSE); |
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106 |
|
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|
107 |
GST_DEBUG ("loading plugin for feature %p; '%s'", feature, |
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|
108 |
GST_PLUGIN_FEATURE_NAME (feature)); |
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|
109 |
if (feature->loaded) |
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|
110 |
return gst_object_ref (feature); |
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|
111 |
|
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|
112 |
GST_DEBUG ("loading plugin %s", feature->plugin_name); |
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|
113 |
plugin = gst_plugin_load_by_name (feature->plugin_name); |
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|
114 |
if (!plugin) |
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|
115 |
goto load_failed; |
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|
116 |
|
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|
117 |
GST_DEBUG ("loaded plugin %s", feature->plugin_name); |
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|
118 |
gst_object_unref (plugin); |
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|
119 |
|
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|
120 |
real_feature = |
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|
121 |
gst_registry_lookup_feature (gst_registry_get_default (), feature->name); |
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|
122 |
|
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|
123 |
if (real_feature == NULL) |
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|
124 |
goto disappeared; |
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|
125 |
else if (!real_feature->loaded) |
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|
126 |
goto not_found; |
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|
127 |
|
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|
128 |
return real_feature; |
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|
129 |
|
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|
130 |
/* ERRORS */ |
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|
131 |
load_failed: |
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|
132 |
{ |
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|
133 |
GST_WARNING ("Failed to load plugin containing feature '%s'.", |
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|
134 |
GST_PLUGIN_FEATURE_NAME (feature)); |
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|
135 |
return NULL; |
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|
136 |
} |
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|
137 |
disappeared: |
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|
138 |
{ |
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|
139 |
GST_INFO |
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|
140 |
("Loaded plugin containing feature '%s', but feature disappeared.", |
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|
141 |
feature->name); |
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|
142 |
return NULL; |
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|
143 |
} |
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|
144 |
not_found: |
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|
145 |
{ |
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|
146 |
GST_INFO ("Tried to load plugin containing feature '%s', but feature was " |
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|
147 |
"not found.", real_feature->name); |
0e761a78d257
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|
148 |
return NULL; |
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|
149 |
} |
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|
150 |
} |
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|
151 |
|
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|
152 |
/** |
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|
153 |
* gst_plugin_feature_type_name_filter: |
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|
154 |
* @feature: the #GstPluginFeature |
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|
155 |
* @data: the type and name to check against |
0e761a78d257
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|
156 |
* |
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|
157 |
* Compares type and name of plugin feature. Can be used with gst_filter_run(). |
0e761a78d257
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|
158 |
* |
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|
159 |
* Returns: TRUE if equal. |
0e761a78d257
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|
160 |
*/ |
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diff
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|
161 |
#ifdef __SYMBIAN32__ |
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|
162 |
EXPORT_C |
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|
163 |
#endif |
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|
164 |
|
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|
165 |
gboolean |
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|
166 |
gst_plugin_feature_type_name_filter (GstPluginFeature * feature, |
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|
167 |
GstTypeNameData * data) |
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|
168 |
{ |
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|
169 |
return ((data->type == 0 || data->type == G_OBJECT_TYPE (feature)) && |
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|
170 |
(data->name == NULL |
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|
171 |
|| !strcmp (data->name, GST_PLUGIN_FEATURE_NAME (feature)))); |
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|
172 |
} |
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|
173 |
|
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|
174 |
/** |
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|
175 |
* gst_plugin_feature_set_name: |
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|
176 |
* @feature: a feature |
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|
177 |
* @name: the name to set |
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|
178 |
* |
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|
179 |
* Sets the name of a plugin feature. The name uniquely identifies a feature |
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|
180 |
* within all features of the same type. Renaming a plugin feature is not |
0e761a78d257
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|
181 |
* allowed. A copy is made of the name so you should free the supplied @name |
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|
182 |
* after calling this function. |
0e761a78d257
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|
183 |
*/ |
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|
184 |
#ifdef __SYMBIAN32__ |
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|
185 |
EXPORT_C |
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|
186 |
#endif |
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|
187 |
|
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|
188 |
void |
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|
189 |
gst_plugin_feature_set_name (GstPluginFeature * feature, const gchar * name) |
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|
190 |
{ |
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|
191 |
g_return_if_fail (GST_IS_PLUGIN_FEATURE (feature)); |
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|
192 |
g_return_if_fail (name != NULL); |
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|
193 |
|
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|
194 |
if (feature->name) { |
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|
195 |
g_return_if_fail (strcmp (feature->name, name) == 0); |
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|
196 |
} else { |
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|
197 |
feature->name = g_strdup (name); |
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|
198 |
} |
16 | 199 |
gst_object_set_name (GST_OBJECT_CAST (feature), feature->name); |
0
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|
200 |
} |
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|
201 |
|
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|
202 |
/** |
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|
203 |
* gst_plugin_feature_get_name: |
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|
204 |
* @feature: a feature |
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|
205 |
* |
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|
206 |
* Gets the name of a plugin feature. |
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|
207 |
* |
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|
208 |
* Returns: the name |
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|
209 |
*/ |
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|
210 |
#ifdef __SYMBIAN32__ |
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|
211 |
EXPORT_C |
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|
212 |
#endif |
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|
213 |
|
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G_CONST_RETURN gchar * |
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gst_plugin_feature_get_name (GstPluginFeature * feature) |
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216 |
{ |
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g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), NULL); |
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|
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return feature->name; |
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} |
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|
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/** |
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* gst_plugin_feature_set_rank: |
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* @feature: feature to rank |
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* @rank: rank value - higher number means more priority rank |
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* |
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* Specifies a rank for a plugin feature, so that autoplugging uses |
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* the most appropriate feature. |
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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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233 |
|
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void |
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gst_plugin_feature_set_rank (GstPluginFeature * feature, guint rank) |
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236 |
{ |
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g_return_if_fail (feature != NULL); |
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g_return_if_fail (GST_IS_PLUGIN_FEATURE (feature)); |
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239 |
|
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feature->rank = rank; |
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} |
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|
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/** |
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* gst_plugin_feature_get_rank: |
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* @feature: a feature |
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* |
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* Gets the rank of a plugin feature. |
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* |
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* Returns: The rank of the feature |
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*/ |
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251 |
#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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254 |
|
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guint |
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gst_plugin_feature_get_rank (GstPluginFeature * feature) |
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257 |
{ |
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g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), GST_RANK_NONE); |
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259 |
|
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return feature->rank; |
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} |
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262 |
|
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/** |
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* gst_plugin_feature_list_free: |
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* @list: list of #GstPluginFeature |
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* |
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* Unrefs each member of @list, then frees the list. |
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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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void |
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gst_plugin_feature_list_free (GList * list) |
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275 |
{ |
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GList *g; |
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|
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for (g = list; g; g = g->next) { |
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GstPluginFeature *feature = GST_PLUGIN_FEATURE_CAST (g->data); |
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|
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gst_object_unref (feature); |
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} |
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g_list_free (list); |
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} |
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285 |
|
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/** |
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* gst_plugin_feature_check_version: |
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* @feature: a feature |
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* @min_major: minimum required major version |
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* @min_minor: minimum required minor version |
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* @min_micro: minimum required micro version |
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* |
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* Checks whether the given plugin feature is at least |
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* the required version |
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* |
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* Returns: #TRUE if the plugin feature has at least |
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* the required version, otherwise #FALSE. |
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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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gboolean |
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gst_plugin_feature_check_version (GstPluginFeature * feature, |
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guint min_major, guint min_minor, guint min_micro) |
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{ |
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GstRegistry *registry; |
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GstPlugin *plugin; |
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gboolean ret = FALSE; |
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|
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g_return_val_if_fail (feature != NULL, FALSE); |
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g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), FALSE); |
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|
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GST_DEBUG ("Looking up plugin '%s' containing plugin feature '%s'", |
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feature->plugin_name, feature->name); |
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|
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registry = gst_registry_get_default (); |
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plugin = gst_registry_find_plugin (registry, feature->plugin_name); |
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|
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if (plugin) { |
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const gchar *ver_str; |
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guint major, minor, micro; |
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323 |
|
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ver_str = gst_plugin_get_version (plugin); |
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g_return_val_if_fail (ver_str != NULL, FALSE); |
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326 |
|
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if (sscanf (ver_str, "%u.%u.%u", &major, &minor, µ) == 3) { |
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if (major > min_major) |
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ret = TRUE; |
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else if (major < min_major) |
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ret = FALSE; |
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else if (minor > min_minor) |
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ret = TRUE; |
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else if (minor < min_minor) |
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ret = FALSE; |
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else if (micro > min_micro) |
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ret = TRUE; |
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else |
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ret = (micro == min_micro); |
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340 |
|
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GST_DEBUG ("Checking whether %u.%u.%u >= %u.%u.%u? %s", major, minor, |
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micro, min_major, min_minor, min_micro, (ret) ? "yes" : "no"); |
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} else { |
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GST_WARNING ("Could not parse version string '%s' of plugin '%s'", |
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ver_str, feature->plugin_name); |
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} |
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347 |
|
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gst_object_unref (plugin); |
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} else { |
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GST_DEBUG ("Could not find plugin '%s'", feature->plugin_name); |
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} |
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352 |
|
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return ret; |
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354 |
} |