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 "gst_private.h"
28 #include "gsttaginterface.h"
29 #include <gobject/gvaluecollector.h>
32 GST_DEBUG_CATEGORY_STATIC (gst_tag_interface_debug);
33 #define GST_CAT_DEFAULT tag_tag_interface_debug
35 static GQuark gst_tag_key;
45 gst_tag_setter_get_type (void)
47 static GType tag_setter_type = 0;
49 if (!tag_setter_type) {
50 static const GTypeInfo tag_setter_info = {
51 sizeof (GstTagSetterIFace), /* class_size */
53 NULL, /* base_finalize */
55 NULL, /* class_finalize */
56 NULL, /* class_data */
62 GST_DEBUG_CATEGORY_INIT (gst_tag_interface_debug, "GstTagInterface", 0,
63 "interfaces for tagging");
65 tag_setter_type = g_type_register_static (G_TYPE_INTERFACE, "GstTagSetter",
68 g_type_interface_add_prerequisite (tag_setter_type, GST_TYPE_ELEMENT);
70 gst_tag_key = g_quark_from_static_string ("GST_TAG_SETTER");
73 return tag_setter_type;
76 gst_tag_data_free (gpointer p)
78 GstTagData *data = (GstTagData *) p;
81 gst_tag_list_free (data->list);
86 gst_tag_setter_get_data (GstTagSetter * setter)
90 data = g_object_get_qdata (G_OBJECT (setter), gst_tag_key);
92 data = g_new (GstTagData, 1);
94 data->mode = GST_TAG_MERGE_KEEP;
95 g_object_set_qdata_full (G_OBJECT (setter), gst_tag_key, data,
103 * gst_tag_setter_merge:
104 * @setter: a #GstTagSetter
105 * @list: a tag list to merge from
106 * @mode: the mode to merge with
108 * Merges the given list into the setter's list using the given mode.
111 gst_tag_setter_merge (GstTagSetter * setter, const GstTagList * list,
112 GstTagMergeMode mode)
116 g_return_if_fail (GST_IS_TAG_SETTER (setter));
117 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
119 data = gst_tag_setter_get_data (setter);
121 data->list = gst_tag_list_copy (list);
123 gst_tag_list_merge (data->list, list, mode);
128 * gst_tag_setter_add:
129 * @setter: a #GstTagSetter
130 * @mode: the mode to use
132 * @...: more tag / value pairs to set
134 * Adds the given tag / value pairs on the setter using the given merge mode.
135 * The list must be terminated with GST_TAG_INVALID.
138 gst_tag_setter_add (GstTagSetter * setter, GstTagMergeMode mode,
139 const gchar * tag, ...)
143 g_return_if_fail (GST_IS_TAG_SETTER (setter));
144 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
146 va_start (args, tag);
147 gst_tag_setter_add_valist (setter, mode, tag, args);
152 * gst_tag_setter_add_values:
153 * @setter: a #GstTagSetter
154 * @mode: the mode to use
156 * @...: more tag / GValue pairs to set
158 * Adds the given tag / GValue pairs on the setter using the given merge mode.
159 * The list must be terminated with GST_TAG_INVALID.
162 gst_tag_setter_add_values (GstTagSetter * setter, GstTagMergeMode mode,
163 const gchar * tag, ...)
167 g_return_if_fail (GST_IS_TAG_SETTER (setter));
168 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
170 va_start (args, tag);
171 gst_tag_setter_add_valist_values (setter, mode, tag, args);
176 * gst_tag_setter_add_valist:
177 * @setter: a #GstTagSetter
178 * @mode: the mode to use
180 * @var_args: tag / value pairs to set
182 * Adds the given tag / value pairs on the setter using the given merge mode.
183 * The list must be terminated with GST_TAG_INVALID.
186 gst_tag_setter_add_valist (GstTagSetter * setter, GstTagMergeMode mode,
187 const gchar * tag, va_list var_args)
191 g_return_if_fail (GST_IS_TAG_SETTER (setter));
192 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
194 data = gst_tag_setter_get_data (setter);
196 data->list = gst_tag_list_new ();
198 gst_tag_list_add_valist (data->list, mode, tag, var_args);
202 * gst_tag_setter_add_valist_values:
203 * @setter: a #GstTagSetter
204 * @mode: the mode to use
206 * @var_args: tag / GValue pairs to set
208 * Adds the given tag / GValue pairs on the setter using the given merge mode.
209 * The list must be terminated with GST_TAG_INVALID.
212 gst_tag_setter_add_valist_values (GstTagSetter * setter, GstTagMergeMode mode,
213 const gchar * tag, va_list var_args)
217 g_return_if_fail (GST_IS_TAG_SETTER (setter));
218 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
220 data = gst_tag_setter_get_data (setter);
222 data->list = gst_tag_list_new ();
224 gst_tag_list_add_valist_values (data->list, mode, tag, var_args);
228 * gst_tag_setter_get_list:
229 * @setter: a #GstTagSetter
231 * Retrieves a copy of the current list of tags the setter uses.
232 * You need to gst_tag_list_free() the list after use.
234 * Returns: a current snapshot of the taglist used in the setter
235 * or NULL if none is used.
238 gst_tag_setter_get_list (GstTagSetter * setter)
240 g_return_val_if_fail (GST_IS_TAG_SETTER (setter), NULL);
242 return gst_tag_setter_get_data (setter)->list;
246 * gst_tag_setter_set_merge_mode:
247 * @setter: a #GstTagSetter
248 * @mode: The mode with which tags are added
250 * Sets the given merge mode that is used for adding tags from events to tags
251 * specified by this interface. The default is #GST_TAG_MERGE_KEEP, which keeps
252 * the tags by this interface and discards tags from events.
255 gst_tag_setter_set_merge_mode (GstTagSetter * setter, GstTagMergeMode mode)
257 g_return_if_fail (GST_IS_TAG_SETTER (setter));
258 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
260 gst_tag_setter_get_data (setter)->mode = mode;
264 * gst_tag_setter_get_merge_mode:
265 * @setter: a #GstTagSetter
267 * Queries the mode by which tags inside the setter are overwritten by tags
270 * Returns: the merge mode used inside the element.
273 gst_tag_setter_get_merge_mode (GstTagSetter * setter)
275 g_return_val_if_fail (GST_IS_TAG_SETTER (setter), FALSE);
277 return gst_tag_setter_get_data (setter)->mode;