2 * Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
4 * gsttagsetter.c: interface for tag setting on elements
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
23 * SECTION:gsttagsetter
24 * @short_description: Element interface that allows setting and retrieval
27 * Element interface that allows setting and retrieval of media metadata.
29 * Last reviewed on 2005-11-23 (0.9.5)
36 #include "gst_private.h"
37 #include "gsttagsetter.h"
38 #include <gobject/gvaluecollector.h>
41 GST_DEBUG_CATEGORY_STATIC (gst_tag_interface_debug);
42 #define GST_CAT_DEFAULT tag_tag_interface_debug
44 static GQuark gst_tag_key;
54 gst_tag_setter_get_type (void)
56 static GType tag_setter_type = 0;
58 if (!tag_setter_type) {
59 static const GTypeInfo tag_setter_info = {
60 sizeof (GstTagSetterIFace), /* class_size */
62 NULL, /* base_finalize */
64 NULL, /* class_finalize */
65 NULL, /* class_data */
71 GST_DEBUG_CATEGORY_INIT (gst_tag_interface_debug, "GstTagInterface", 0,
72 "interfaces for tagging");
74 tag_setter_type = g_type_register_static (G_TYPE_INTERFACE, "GstTagSetter",
77 g_type_interface_add_prerequisite (tag_setter_type, GST_TYPE_ELEMENT);
79 gst_tag_key = g_quark_from_static_string ("GST_TAG_SETTER");
82 return tag_setter_type;
85 gst_tag_data_free (gpointer p)
87 GstTagData *data = (GstTagData *) p;
90 gst_tag_list_free (data->list);
95 gst_tag_setter_get_data (GstTagSetter * setter)
99 data = g_object_get_qdata (G_OBJECT (setter), gst_tag_key);
101 data = g_new (GstTagData, 1);
103 data->mode = GST_TAG_MERGE_KEEP;
104 g_object_set_qdata_full (G_OBJECT (setter), gst_tag_key, data,
112 * gst_tag_setter_merge_tags:
113 * @setter: a #GstTagSetter
114 * @list: a tag list to merge from
115 * @mode: the mode to merge with
117 * Merges the given list into the setter's list using the given mode.
120 gst_tag_setter_merge_tags (GstTagSetter * setter, const GstTagList * list,
121 GstTagMergeMode mode)
125 g_return_if_fail (GST_IS_TAG_SETTER (setter));
126 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
128 data = gst_tag_setter_get_data (setter);
130 data->list = gst_tag_list_copy (list);
132 gst_tag_list_merge (data->list, list, mode);
137 * gst_tag_setter_add_tags:
138 * @setter: a #GstTagSetter
139 * @mode: the mode to use
141 * @...: more tag / value pairs to set
143 * Adds the given tag / value pairs on the setter using the given merge mode.
144 * The list must be terminated with NULL.
147 gst_tag_setter_add_tags (GstTagSetter * setter, GstTagMergeMode mode,
148 const gchar * tag, ...)
152 g_return_if_fail (GST_IS_TAG_SETTER (setter));
153 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
155 va_start (args, tag);
156 gst_tag_setter_add_tag_valist (setter, mode, tag, args);
161 * gst_tag_setter_add_tag_values:
162 * @setter: a #GstTagSetter
163 * @mode: the mode to use
165 * @...: more tag / GValue pairs to set
167 * Adds the given tag / GValue pairs on the setter using the given merge mode.
168 * The list must be terminated with NULL.
171 gst_tag_setter_add_tag_values (GstTagSetter * setter, GstTagMergeMode mode,
172 const gchar * tag, ...)
176 g_return_if_fail (GST_IS_TAG_SETTER (setter));
177 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
179 va_start (args, tag);
180 gst_tag_setter_add_tag_valist_values (setter, mode, tag, args);
185 * gst_tag_setter_add_tag_valist:
186 * @setter: a #GstTagSetter
187 * @mode: the mode to use
189 * @var_args: tag / value pairs to set
191 * Adds the given tag / value pairs on the setter using the given merge mode.
192 * The list must be terminated with NULL.
195 gst_tag_setter_add_tag_valist (GstTagSetter * setter, GstTagMergeMode mode,
196 const gchar * tag, va_list var_args)
200 g_return_if_fail (GST_IS_TAG_SETTER (setter));
201 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
203 data = gst_tag_setter_get_data (setter);
205 data->list = gst_tag_list_new ();
207 gst_tag_list_add_valist (data->list, mode, tag, var_args);
211 * gst_tag_setter_add_tag_valist_values:
212 * @setter: a #GstTagSetter
213 * @mode: the mode to use
215 * @var_args: tag / GValue pairs to set
217 * Adds the given tag / GValue pairs on the setter using the given merge mode.
218 * The list must be terminated with NULL.
221 gst_tag_setter_add_tag_valist_values (GstTagSetter * setter,
222 GstTagMergeMode mode, const gchar * tag, va_list var_args)
226 g_return_if_fail (GST_IS_TAG_SETTER (setter));
227 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
229 data = gst_tag_setter_get_data (setter);
231 data->list = gst_tag_list_new ();
233 gst_tag_list_add_valist_values (data->list, mode, tag, var_args);
237 * gst_tag_setter_get_tag_list:
238 * @setter: a #GstTagSetter
240 * Returns the current list of tags the setter uses. The list should not be
243 * Returns: a current snapshot of the taglist used in the setter
244 * or NULL if none is used.
246 G_CONST_RETURN GstTagList *
247 gst_tag_setter_get_tag_list (GstTagSetter * setter)
249 g_return_val_if_fail (GST_IS_TAG_SETTER (setter), NULL);
251 return gst_tag_setter_get_data (setter)->list;
255 * gst_tag_setter_set_tag_merge_mode:
256 * @setter: a #GstTagSetter
257 * @mode: The mode with which tags are added
259 * Sets the given merge mode that is used for adding tags from events to tags
260 * specified by this interface. The default is #GST_TAG_MERGE_KEEP, which keeps
261 * the tags by this interface and discards tags from events.
264 gst_tag_setter_set_tag_merge_mode (GstTagSetter * setter, GstTagMergeMode mode)
266 g_return_if_fail (GST_IS_TAG_SETTER (setter));
267 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
269 gst_tag_setter_get_data (setter)->mode = mode;
273 * gst_tag_setter_get_tag_merge_mode:
274 * @setter: a #GstTagSetter
276 * Queries the mode by which tags inside the setter are overwritten by tags
279 * Returns: the merge mode used inside the element.
282 gst_tag_setter_get_tag_merge_mode (GstTagSetter * setter)
284 g_return_val_if_fail (GST_IS_TAG_SETTER (setter), FALSE);
286 return gst_tag_setter_get_data (setter)->mode;