2 * Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
4 * gsttaginterface.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.
27 #include "gsttaginterface.h"
28 #include <gobject/gvaluecollector.h>
31 GST_DEBUG_CATEGORY_STATIC (gst_tag_interface_debug);
32 #define GST_CAT_DEFAULT tag_tag_interface_debug
34 static GQuark gst_tag_key;
43 gst_tag_setter_get_type (void)
45 static GType tag_setter_type = 0;
47 if (!tag_setter_type) {
48 static const GTypeInfo tag_setter_info = {
49 sizeof (GstTagSetterIFace), /* class_size */
51 NULL, /* base_finalize */
53 NULL, /* class_finalize */
54 NULL, /* class_data */
60 GST_DEBUG_CATEGORY_INIT (gst_tag_interface_debug, "GstTagInterface", 0,
61 "interfaces for tagging");
63 tag_setter_type = g_type_register_static (G_TYPE_INTERFACE, "GstTagSetter",
66 g_type_interface_add_prerequisite (tag_setter_type, GST_TYPE_ELEMENT);
68 gst_tag_key = g_quark_from_static_string ("GST_TAG_SETTER");
71 return tag_setter_type;
74 gst_tag_data_free (gpointer p)
76 GstTagData *data = (GstTagData *) p;
79 gst_tag_list_free (data->list);
84 gst_tag_setter_get_data (GstTagSetter * setter)
88 data = g_object_get_qdata (G_OBJECT (setter), gst_tag_key);
90 data = g_new (GstTagData, 1);
92 data->mode = GST_TAG_MERGE_KEEP;
93 g_object_set_qdata_full (G_OBJECT (setter), gst_tag_key, data,
101 * gst_tag_setter_merge:
102 * @setter: a #GstTagSetter
103 * @list: a tag list to merge from
104 * @mode: the mode to merge with
106 * Merges the given list into the setter's list using the given mode.
109 gst_tag_setter_merge (GstTagSetter * setter, const GstTagList * list,
110 GstTagMergeMode mode)
114 g_return_if_fail (GST_IS_TAG_SETTER (setter));
115 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
117 data = gst_tag_setter_get_data (setter);
119 data->list = gst_tag_list_copy (list);
121 gst_tag_list_merge (data->list, list, mode);
126 * gst_tag_setter_add:
127 * @setter: a #GstTagSetter
128 * @mode: the mode to use
130 * @...: more tag / value pairs to set
132 * Adds the given tag / value pairs on the setter using the given merge mode.
133 * The list must be terminated with GST_TAG_INVALID.
136 gst_tag_setter_add (GstTagSetter * setter, GstTagMergeMode mode,
137 const gchar * tag, ...)
141 g_return_if_fail (GST_IS_TAG_SETTER (setter));
142 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
144 va_start (args, tag);
145 gst_tag_setter_add_valist (setter, mode, tag, args);
150 * gst_tag_setter_add_values:
151 * @setter: a #GstTagSetter
152 * @mode: the mode to use
154 * @...: more tag / GValue pairs to set
156 * Adds the given tag / GValue pairs on the setter using the given merge mode.
157 * The list must be terminated with GST_TAG_INVALID.
160 gst_tag_setter_add_values (GstTagSetter * setter, GstTagMergeMode mode,
161 const gchar * tag, ...)
165 g_return_if_fail (GST_IS_TAG_SETTER (setter));
166 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
168 va_start (args, tag);
169 gst_tag_setter_add_valist_values (setter, mode, tag, args);
174 * gst_tag_setter_add_valist:
175 * @setter: a #GstTagSetter
176 * @mode: the mode to use
178 * @var_args: tag / value pairs to set
180 * Adds the given tag / value pairs on the setter using the given merge mode.
181 * The list must be terminated with GST_TAG_INVALID.
184 gst_tag_setter_add_valist (GstTagSetter * setter, GstTagMergeMode mode,
185 const gchar * tag, va_list var_args)
189 g_return_if_fail (GST_IS_TAG_SETTER (setter));
190 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
192 data = gst_tag_setter_get_data (setter);
194 data->list = gst_tag_list_new ();
196 gst_tag_list_add_valist (data->list, mode, tag, var_args);
200 * gst_tag_setter_add_valist_values:
201 * @setter: a #GstTagSetter
202 * @mode: the mode to use
204 * @var_args: tag / GValue pairs to set
206 * Adds the given tag / GValue pairs on the setter using the given merge mode.
207 * The list must be terminated with GST_TAG_INVALID.
210 gst_tag_setter_add_valist_values (GstTagSetter * setter, GstTagMergeMode mode,
211 const gchar * tag, va_list var_args)
215 g_return_if_fail (GST_IS_TAG_SETTER (setter));
216 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
218 data = gst_tag_setter_get_data (setter);
220 data->list = gst_tag_list_new ();
222 gst_tag_list_add_valist_values (data->list, mode, tag, var_args);
226 * gst_tag_setter_get_list:
227 * @setter: a #GstTagSetter
229 * Retrieves a copy of the current list of tags the setter uses.
230 * You need to gst_tag_list_free() the list after use.
232 * Returns: a current snapshot of the taglist used in the setter
233 * or NULL if none is used.
236 gst_tag_setter_get_list (GstTagSetter * setter)
238 g_return_val_if_fail (GST_IS_TAG_SETTER (setter), NULL);
240 return gst_tag_setter_get_data (setter)->list;
244 * gst_tag_setter_set_merge_mode:
245 * @setter: a #GstTagSetter
246 * @mode: The mode with which tags are added
248 * Sets the given merge mode that is used for adding tags from events to tags
249 * specified by this interface. The default is #GST_TAG_MERGE_KEEP, which keeps
250 * the tags by this interface and discards tags from events.
253 gst_tag_setter_set_merge_mode (GstTagSetter * setter, GstTagMergeMode mode)
255 g_return_if_fail (GST_IS_TAG_SETTER (setter));
256 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
258 gst_tag_setter_get_data (setter)->mode = mode;
262 * gst_tag_setter_get_merge_mode:
263 * @setter: a #GstTagSetter
265 * Queries the mode by which tags inside the setter are overwritten by tags
268 * Returns: the merge mode used inside the element.
271 gst_tag_setter_get_merge_mode (GstTagSetter * setter)
273 g_return_val_if_fail (GST_IS_TAG_SETTER (setter), FALSE);
275 return gst_tag_setter_get_data (setter)->mode;