2 * Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
4 * gsttag.c: tag support (aka metadata)
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.
26 #include "gst_private.h"
27 #include "gst-i18n-lib.h"
32 #include <gobject/gvaluecollector.h>
35 #define GST_TAG_IS_VALID(tag) (gst_tag_get_info (tag) != NULL)
38 GType type; /* type the data is in */
40 gchar * nick; /* translated name */
41 gchar * blurb; /* translated description of type */
43 GstTagMergeFunc merge_func; /* functions to merge the values */
44 GstTagFlag flag; /* type of tag */
47 #define TAGLIST "taglist"
48 static GQuark gst_tag_list_quark;
49 static GMutex *__tag_mutex;
50 static GHashTable *__tags;
51 #define TAG_LOCK g_mutex_lock (__tag_mutex)
52 #define TAG_UNLOCK g_mutex_unlock (__tag_mutex)
55 _gst_tag_initialize (void)
57 gst_tag_list_quark = g_quark_from_static_string (TAGLIST);
58 __tag_mutex = g_mutex_new ();
59 __tags = g_hash_table_new (g_direct_hash, g_direct_equal);
60 gst_tag_register (GST_TAG_TITLE, GST_TAG_FLAG_META,
63 _("commonly used title"),
64 gst_tag_merge_strings_with_comma);
65 gst_tag_register (GST_TAG_ARTIST, GST_TAG_FLAG_META,
68 _("person(s) responsible for the recording"),
69 gst_tag_merge_strings_with_comma);
70 gst_tag_register (GST_TAG_ALBUM, GST_TAG_FLAG_META,
73 _("album containing this data"),
74 gst_tag_merge_strings_with_comma);
75 gst_tag_register (GST_TAG_DATE, GST_TAG_FLAG_META,
76 G_TYPE_UINT, /* FIXME: own data type for dates? */
78 _("date the data was created (in Julian calendar days)"),
80 gst_tag_register (GST_TAG_GENRE, GST_TAG_FLAG_META,
83 _("genre this data belongs to"),
84 gst_tag_merge_strings_with_comma);
85 gst_tag_register (GST_TAG_COMMENT, GST_TAG_FLAG_META,
88 _("free text commenting the data"),
89 gst_tag_merge_strings_with_comma);
90 gst_tag_register (GST_TAG_TRACK_NUMBER, GST_TAG_FLAG_META,
93 _("track number inside a collection"),
94 gst_tag_merge_use_first);
95 gst_tag_register (GST_TAG_TRACK_COUNT, GST_TAG_FLAG_META,
98 _("count of tracks inside collection this track belongs to"),
99 gst_tag_merge_use_first);
100 gst_tag_register (GST_TAG_LOCATION, GST_TAG_FLAG_META,
103 _("original location of file as a URI"),
104 gst_tag_merge_strings_with_comma);
105 gst_tag_register (GST_TAG_DESCRIPTION, GST_TAG_FLAG_META,
108 _("short text describing the content of the data"),
109 gst_tag_merge_strings_with_comma);
110 gst_tag_register (GST_TAG_VERSION, GST_TAG_FLAG_META,
113 _("version of this data"),
115 gst_tag_register (GST_TAG_ISRC, GST_TAG_FLAG_META,
118 _("International Standard Recording Code - see http://www.ifpi.org/isrc/"),
120 gst_tag_register (GST_TAG_ORGANIZATION, GST_TAG_FLAG_META,
123 _("organization"), /* FIXME */
124 gst_tag_merge_strings_with_comma);
125 gst_tag_register (GST_TAG_COPYRIGHT, GST_TAG_FLAG_META,
128 _("copyright notice of the data"),
130 gst_tag_register (GST_TAG_CONTACT, GST_TAG_FLAG_META,
133 _("contact information"),
134 gst_tag_merge_strings_with_comma);
135 gst_tag_register (GST_TAG_LICENSE, GST_TAG_FLAG_META,
138 _("license of data"),
140 gst_tag_register (GST_TAG_PERFORMER, GST_TAG_FLAG_META,
143 _("person(s) performing"),
144 gst_tag_merge_strings_with_comma);
145 gst_tag_register (GST_TAG_DURATION, GST_TAG_FLAG_DECODED,
148 _("length in GStreamer time units (nanoseconds)"),
150 gst_tag_register (GST_TAG_CODEC, GST_TAG_FLAG_ENCODED,
153 _("codec the data is stored in"),
154 gst_tag_merge_strings_with_comma);
155 gst_tag_register (GST_TAG_BITRATE, GST_TAG_FLAG_ENCODED,
158 _("exact or average bitrate in bits/s"),
160 gst_tag_register (GST_TAG_NOMINAL_BITRATE, GST_TAG_FLAG_ENCODED,
162 _("nominal bitrate"),
163 _("nominal bitrate in bits/s"),
165 gst_tag_register (GST_TAG_MINIMUM_BITRATE, GST_TAG_FLAG_ENCODED,
167 _("minimum bitrate"),
168 _("minimum bitrate in bits/s"),
170 gst_tag_register (GST_TAG_MAXIMUM_BITRATE, GST_TAG_FLAG_ENCODED,
172 _("maximum bitrate"),
173 _("maximum bitrate in bits/s"),
175 gst_tag_register (GST_TAG_ENCODER, GST_TAG_FLAG_ENCODED,
178 _("encoder used to encode this stream"),
180 gst_tag_register (GST_TAG_ENCODER_VERSION, GST_TAG_FLAG_ENCODED,
182 _("encoder version"),
183 _("version of the encoder used to encode this stream"),
185 gst_tag_register (GST_TAG_SERIAL, GST_TAG_FLAG_ENCODED,
188 _("serial number of track"),
190 gst_tag_register (GST_TAG_TRACK_GAIN, GST_TAG_FLAG_META,
192 _("replaygain track gain"),
193 _("track gain in db"),
195 gst_tag_register (GST_TAG_TRACK_PEAK, GST_TAG_FLAG_META,
197 _("replaygain track peak"),
198 _("peak of the track"),
200 gst_tag_register (GST_TAG_ALBUM_GAIN, GST_TAG_FLAG_META,
202 _("replaygain album gain"),
203 _("album gain in db"),
205 gst_tag_register (GST_TAG_ALBUM_PEAK, GST_TAG_FLAG_META,
207 _("replaygain album peak"),
208 _("peak of the album"),
212 * gst_tag_merge_use_first:
213 * @dest: uninitialized GValue to store result in
214 * @src: GValue to copy from
216 * This is a convenience function for the func argument of gst_tag_register().
217 * It creates a copy of the first value from the list.
220 gst_tag_merge_use_first (GValue *dest, const GValue *src)
222 const GValue *ret = gst_value_list_get_value (src, 0);
224 g_value_init (dest, G_VALUE_TYPE (ret));
225 g_value_copy (ret, dest);
228 * gst_tag_merge_strings_with_comma:
229 * @dest: uninitialized GValue to store result in
230 * @src: GValue to copy from
232 * This is a convenience function for the func argument of gst_tag_register().
233 * It concatenates all given strings using a comma. The tag must be registered
234 * as a G_TYPE_STRING or this function will fail.
237 gst_tag_merge_strings_with_comma (GValue *dest, const GValue *src)
242 count = gst_value_list_get_size (src);
243 str = g_string_new (g_value_get_string (gst_value_list_get_value (src, 0)));
244 for (i = 1; i < count; i++) {
245 /* seperator between two string */
246 str = g_string_append (str, _(", "));
247 str = g_string_append (str, g_value_get_string (gst_value_list_get_value (src, 1)));
250 g_value_init (dest, G_TYPE_STRING);
251 g_value_set_string_take_ownership (dest, str->str);
252 g_string_free (str, FALSE);
255 gst_tag_lookup (GQuark entry)
260 ret = g_hash_table_lookup (__tags, GUINT_TO_POINTER (entry));
267 * @name: the name or identifier string
268 * @flag: a flag describing the type of tag info
269 * @type: the type this data is in
270 * @nick: human-readable name
271 * @blurb: a human-readable description about this tag
272 * @func: function for merging multiple values of this tag
274 * Registers a new tag type for the use with GStreamer's type system. If a type
275 * with that name is already registered, that one is used.
276 * The old registration may have used a different type however. So don't rely
277 * on your supplied values.
278 * This function takes ownership of all supplied variables.
281 gst_tag_register (gchar *name, GstTagFlag flag, GType type,
282 gchar *nick, gchar *blurb, GstTagMergeFunc func)
287 g_return_if_fail (name != NULL);
288 g_return_if_fail (nick != NULL);
289 g_return_if_fail (blurb != NULL);
290 g_return_if_fail (type != 0 && type != GST_TYPE_LIST);
292 key = g_quark_from_string (name);
293 info = gst_tag_lookup (key);
294 g_return_if_fail (info == NULL);
296 info = g_new (GstTagInfo, 1);
301 info->merge_func = func;
304 g_hash_table_insert (__tags, GUINT_TO_POINTER (key), info);
309 * @tag: name of the tag
311 * Checks if the given type is already registered.
313 * Returns: TRUE if the type is already registered
316 gst_tag_exists (const gchar *tag)
318 g_return_val_if_fail (tag != NULL, FALSE);
320 return gst_tag_lookup (g_quark_from_string (tag)) != NULL;
326 * Gets the #GType used for this tag.
328 * Returns: the #GType of this tag
331 gst_tag_get_type (const gchar *tag)
335 g_return_val_if_fail (tag != NULL, 0);
336 info = gst_tag_lookup (g_quark_from_string (tag));
337 g_return_val_if_fail (info != NULL, 0);
345 * Returns the human-readable name of this tag, You must not change or free
348 * Returns: the human-readable name of this tag
351 gst_tag_get_nick (const gchar *tag)
355 g_return_val_if_fail (tag != NULL, NULL);
356 info = gst_tag_lookup (g_quark_from_string (tag));
357 g_return_val_if_fail (info != NULL, NULL);
362 * gst_tag_get_description:
365 * Returns the human-readable description of this tag, You must not change or
368 * Return the human-readable description of this tag
371 gst_tag_get_description (const gchar *tag)
375 g_return_val_if_fail (tag != NULL, NULL);
376 info = gst_tag_lookup (g_quark_from_string (tag));
377 g_return_val_if_fail (info != NULL, NULL);
382 * gst_tag_list_is_fixed:
385 * Checks if the given tag is fixed. A fixed tag can only contain one value.
386 * Unfixed tags can contain lists of values.
388 * Returns: TRUE, if the given tag is fixed.
391 gst_tag_is_fixed (const gchar *tag)
395 g_return_val_if_fail (tag != NULL, FALSE);
396 info = gst_tag_lookup (g_quark_from_string (tag));
397 g_return_val_if_fail (info != NULL, FALSE);
399 return info->merge_func == NULL;
404 * Creates a new empty GstTagList.
406 * Returns: An empty tag list
409 gst_tag_list_new (void)
411 return GST_TAG_LIST (gst_structure_new (TAGLIST, NULL));
415 * @p: Object that might be a taglist
417 * Checks if the given pointer is a taglist.
419 * Returns: TRUE, if the given pointer is a taglist
422 gst_is_tag_list (gconstpointer p)
424 g_return_val_if_fail (p != NULL, FALSE);
426 return ((GstStructure *) p)->name == gst_tag_list_quark;
430 GstTagMergeMode mode;
433 gst_tag_list_add_value_internal (GstStructure *list, GstTagMergeMode mode, GQuark tag, GValue *value)
435 GstTagInfo *info = gst_tag_lookup (tag);
436 const GValue *value2;
438 g_assert (info != NULL);
440 if (info->merge_func && (value2 = gst_structure_id_get_value (list, tag)) != NULL) {
441 GValue dest = { 0, };
443 case GST_TAG_MERGE_REPLACE_ALL:
444 case GST_TAG_MERGE_REPLACE:
445 gst_structure_id_set_value (list, tag, value);
447 case GST_TAG_MERGE_PREPEND:
448 gst_value_list_concat (&dest, value, value2);
449 gst_structure_id_set_value (list, tag, &dest);
450 g_value_unset (&dest);
452 case GST_TAG_MERGE_APPEND:
453 gst_value_list_concat (&dest, value2, value);
454 gst_structure_id_set_value (list, tag, &dest);
455 g_value_unset (&dest);
457 case GST_TAG_MERGE_KEEP:
458 case GST_TAG_MERGE_KEEP_ALL:
461 g_assert_not_reached ();
466 case GST_TAG_MERGE_APPEND:
467 case GST_TAG_MERGE_KEEP:
468 if (gst_structure_id_get_value (list, tag) != NULL)
471 case GST_TAG_MERGE_REPLACE_ALL:
472 case GST_TAG_MERGE_REPLACE:
473 case GST_TAG_MERGE_PREPEND:
474 gst_structure_id_set_value (list, tag, value);
476 case GST_TAG_MERGE_KEEP_ALL:
479 g_assert_not_reached ();
485 gst_tag_list_copy_foreach (GQuark tag, GValue *value, gpointer user_data)
487 GstTagCopyData *copy = (GstTagCopyData *) user_data;
489 gst_tag_list_add_value_internal (copy->list, copy->mode, tag, value);
494 * gst_tag_list_insert:
495 * @into: list to merge into
496 * @from: list to merge from
497 * @mode: the mode to use
499 * Inserts the tags of the second list into the first list using the given mode.
502 gst_tag_list_insert (GstTagList *into, const GstTagList *from, GstTagMergeMode mode)
506 g_return_if_fail (GST_IS_TAG_LIST (into));
507 g_return_if_fail (GST_IS_TAG_LIST (from));
508 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
510 data.list = (GstStructure *) into;
512 if (mode == GST_TAG_MERGE_REPLACE_ALL) {
513 gst_structure_remove_all_fields (data.list);
515 gst_structure_foreach ((GstStructure *) from, gst_tag_list_copy_foreach, &data);
519 * @list: list to copy
521 * Copies a given #GstTagList.
523 * Returns: copy of the given list
526 gst_tag_list_copy (const GstTagList *list)
528 g_return_val_if_fail (GST_IS_TAG_LIST (list), NULL);
530 return GST_TAG_LIST (gst_structure_copy ((GstStructure *) list));
533 * gst_tag_list_merge:
534 * @list1: first list to merge
535 * @list2: second list to merge
536 * @mode: the mode to use
538 * Merges the two given lists into a new list. If one of the lists is NULL, a
539 * copy of the other is returned. If both lists are NULL, NULL is returned.
541 * Returns: the new list
544 gst_tag_list_merge (const GstTagList *list1, const GstTagList *list2, GstTagMergeMode mode)
546 g_return_val_if_fail (list1 == NULL || GST_IS_TAG_LIST (list1), NULL);
547 g_return_val_if_fail (list2 == NULL || GST_IS_TAG_LIST (list2), NULL);
548 g_return_val_if_fail (GST_TAG_MODE_IS_VALID (mode), NULL);
550 if (!list1 && !list2) {
553 return gst_tag_list_copy (list2);
555 return gst_tag_list_copy (list1);
559 ret = gst_tag_list_copy (list1);
560 gst_tag_list_insert (ret, list2, mode);
566 * @list: the list to free
568 * Frees the given list and all associated values.
571 gst_tag_list_free (GstTagList *list)
573 g_return_if_fail (GST_IS_TAG_LIST (list));
574 gst_structure_free ((GstStructure *) list);
577 * gst_tag_list_get_tag_size:
579 * @tag: the tag to query
581 * Checks how many value are stored in this tag list for the given tag.
583 * Returns: The number of tags stored
586 gst_tag_list_get_tag_size (const GstTagList *list, const gchar *tag)
590 g_return_val_if_fail (GST_IS_TAG_LIST (list), 0);
592 value = gst_structure_get_value ((GstStructure *) list, tag);
595 if (G_VALUE_TYPE (value) != GST_TYPE_LIST)
598 return gst_value_list_get_size (value);
602 * @list: list to set tags in
603 * @mode: the mode to use
605 * @...: NULL-terminated list of values to set
607 * Sets the values for the given tags using the specified mode.
610 gst_tag_list_add (GstTagList *list, GstTagMergeMode mode, const gchar *tag, ...)
614 g_return_if_fail (GST_IS_TAG_LIST (list));
615 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
616 g_return_if_fail (tag != NULL);
618 va_start (args, tag);
619 gst_tag_list_add_valist (list, mode, tag, args);
623 * gst_tag_list_add_values:
624 * @list: list to set tags in
625 * @mode: the mode to use
627 * @...: GValues to set
629 * Sets the GValues for the given tags using the specified mode.
632 gst_tag_list_add_values (GstTagList *list, GstTagMergeMode mode, const gchar *tag, ...)
636 g_return_if_fail (GST_IS_TAG_LIST (list));
637 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
638 g_return_if_fail (tag != NULL);
640 va_start (args, tag);
641 gst_tag_list_add_valist_values (list, mode, tag, args);
645 * gst_tag_list_add_valist:
646 * @list: list to set tags in
647 * @mode: the mode to use
649 * @var_args: tag / value pairs to set
651 * Sets the values for the given tags using the specified mode.
654 gst_tag_list_add_valist (GstTagList *list, GstTagMergeMode mode, const gchar *tag, va_list var_args)
660 g_return_if_fail (GST_IS_TAG_LIST (list));
661 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
662 g_return_if_fail (tag != NULL);
664 while (tag != NULL) {
665 GValue value = { 0, };
666 quark = g_quark_from_string (tag);
667 info = gst_tag_lookup (quark);
669 g_warning ("no GstTag for %s", tag);
670 g_return_if_fail (info != NULL);
671 g_value_init (&value, info->type);
672 G_VALUE_COLLECT (&value, var_args, 0, &error);
674 g_warning ("%s: %s", G_STRLOC, error);
676 /* we purposely leak the value here, it might not be
677 * in a sane state if an error condition occoured
681 gst_tag_list_add_value_internal (list, mode, quark, &value);
682 g_value_unset (&value);
683 tag = va_arg (var_args, gchar *);
687 * gst_tag_list_add_valist_values:
688 * @list: list to set tags in
689 * @mode: the mode to use
691 * @var_args: tag / GValue pairs to set
693 * Sets the GValues for the given tags using the specified mode.
696 gst_tag_list_add_valist_values (GstTagList *list, GstTagMergeMode mode, const gchar *tag, va_list var_args)
701 g_return_if_fail (GST_IS_TAG_LIST (list));
702 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
703 g_return_if_fail (tag != NULL);
705 while (tag != NULL) {
706 quark = g_quark_from_string (tag);
707 info = gst_tag_lookup (quark);
708 g_return_if_fail (info != NULL);
709 gst_tag_list_add_value_internal (list, mode, quark, va_arg (var_args, GValue *));
710 tag = va_arg (var_args, gchar *);
714 * gst_tag_list_remove_tag:
715 * @list: list to remove tag from
716 * @tag: tag to remove
718 * Removes the goven tag from the taglist.
721 gst_tag_list_remove_tag (GstTagList *list, const gchar *tag)
723 g_return_if_fail (GST_IS_TAG_LIST (list));
724 g_return_if_fail (tag != NULL);
726 gst_structure_remove_field ((GstStructure *) list, tag);
729 GstTagForeachFunc func;
730 GstTagList * tag_list;
734 structure_foreach_wrapper (GQuark field_id,
735 GValue *value, gpointer user_data)
737 TagForeachData *data = (TagForeachData *) user_data;
738 data->func (data->tag_list, g_quark_to_string (field_id), data->data);
742 * gst_tag_list_foreach:
743 * @list: list to iterate over
744 * @func: function to be called for each tag
745 * @user_data: user specified data
747 * Calls the given function for each tag inside the tag list. Note that if there
748 * is no tag, the function won't be called at all.
751 gst_tag_list_foreach (GstTagList *list, GstTagForeachFunc func, gpointer user_data)
755 g_return_if_fail (GST_IS_TAG_LIST (list));
756 g_return_if_fail (func != NULL);
759 data.tag_list = list;
760 data.data = user_data;
761 gst_structure_foreach ((GstStructure *) list, structure_foreach_wrapper, &data);
764 /***** tag events *****/
768 * @list: the tag list to put into the event or NULL for an empty list
770 * Creates a new tag event with the given list and takes ownership of it.
772 * Returns: a new tag event
775 gst_event_new_tag (GstTagList *list)
779 g_return_val_if_fail (list == NULL || GST_IS_TAG_LIST (list), NULL);
781 ret = gst_event_new (GST_EVENT_TAG);
783 list = gst_tag_list_new ();
784 ret->event_data.structure.structure = (GstStructure *) list;
789 * get_event_tag_get_list:
790 * @tag_event: a tagging #GstEvent
792 * Gets the taglist from a given tagging event.
794 * Returns: The #GstTagList of the event
797 gst_event_tag_get_list (GstEvent *tag_event)
799 g_return_val_if_fail (GST_IS_EVENT (tag_event), NULL);
800 g_return_val_if_fail (GST_EVENT_TYPE (tag_event) == GST_EVENT_TAG, NULL);
802 return GST_TAG_LIST (tag_event->event_data.structure.structure);
806 * gst_tag_list_get_value_index:
807 * @list: a #GStTagList
808 * @tag: tag to read out
809 * @index: number of entry to read out
811 * Gets the value that is at the given index for the given tag in the given
814 * Returns: The GValue for the specified entry or NULL if the tag wasn't available
815 * or the tag doesn't have as many entries
817 G_CONST_RETURN GValue *
818 gst_tag_list_get_value_index (const GstTagList *list, const gchar *tag, guint index)
822 g_return_val_if_fail (GST_IS_TAG_LIST (list), NULL);
823 g_return_val_if_fail (tag != NULL, NULL);
825 value = gst_structure_get_value ((GstStructure *) list, tag);
826 if (value == NULL) return NULL;
828 if (GST_VALUE_HOLDS_LIST (value)) {
829 if (index >= gst_value_list_get_size (value)) return NULL;
830 return gst_value_list_get_value (value, index);
832 if (index > 0) return NULL;
838 * gst_tag_list_copy_value:
839 * @dest: uninitialized #GValue to copy into
840 * @list: list to get the tag from
841 * @tag: tag to read out
843 * Copies the contents for the given tag into the value, merging multiple values
844 * into one if multiple values are associated with the tag.
845 * You must g_value_unset() the value after use.
847 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
851 gst_tag_list_copy_value (GValue *dest, const GstTagList *list, const gchar *tag)
855 g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE);
856 g_return_val_if_fail (tag != NULL, FALSE);
857 g_return_val_if_fail (dest != NULL, FALSE);
858 g_return_val_if_fail (G_VALUE_TYPE (dest) == 0, FALSE);
860 src = gst_structure_get_value ((GstStructure *) list, tag);
861 if (!src) return FALSE;
863 if (G_VALUE_TYPE (src) == GST_TYPE_LIST) {
864 GstTagInfo *info = gst_tag_lookup (g_quark_from_string (tag));
865 /* must be there or lists aren't allowed */
866 g_assert (info->merge_func);
867 info->merge_func (dest, src);
869 g_value_init (dest, G_VALUE_TYPE (src));
870 g_value_copy (src, dest);
875 /***** evil macros to get all the gst_tag_list_get_*() functions right *****/
877 #define TAG_MERGE_FUNCS(name,type) \
879 gst_tag_list_get_ ## name (const GstTagList *list, const gchar *tag, \
884 g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE); \
885 g_return_val_if_fail (tag != NULL, FALSE); \
886 g_return_val_if_fail (value != NULL, FALSE); \
888 if (!gst_tag_list_copy_value (&v, list, tag)) \
890 *value = COPY_FUNC (g_value_get_ ## name (&v)); \
891 g_value_unset (&v); \
896 gst_tag_list_get_ ## name ## _index (const GstTagList *list, const gchar *tag, \
897 guint index, type *value) \
901 g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE); \
902 g_return_val_if_fail (tag != NULL, FALSE); \
903 g_return_val_if_fail (value != NULL, FALSE); \
905 if ((v = gst_tag_list_get_value_index (list, tag, index)) == NULL) \
907 *value = COPY_FUNC (g_value_get_ ## name (v)); \
911 #define COPY_FUNC /**/
912 TAG_MERGE_FUNCS (char, gchar)
913 TAG_MERGE_FUNCS (uchar, guchar)
914 TAG_MERGE_FUNCS (boolean, gboolean)
915 TAG_MERGE_FUNCS (int, gint)
916 TAG_MERGE_FUNCS (uint, guint)
917 TAG_MERGE_FUNCS (long, glong)
918 TAG_MERGE_FUNCS (ulong, gulong)
919 TAG_MERGE_FUNCS (int64, gint64)
920 TAG_MERGE_FUNCS (uint64, guint64)
921 TAG_MERGE_FUNCS (float, gfloat)
922 TAG_MERGE_FUNCS (double, gdouble)
925 #define COPY_FUNC g_strdup
926 TAG_MERGE_FUNCS (string, gchar *)