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_APPLICATION, GST_TAG_FLAG_META,
148 _("application that wrote the stream"),
149 gst_tag_merge_strings_with_comma);
150 gst_tag_register (GST_TAG_DURATION, GST_TAG_FLAG_DECODED,
153 _("length in GStreamer time units (nanoseconds)"),
155 gst_tag_register (GST_TAG_CODEC, GST_TAG_FLAG_ENCODED,
158 _("codec the data is stored in"),
159 gst_tag_merge_strings_with_comma);
160 gst_tag_register (GST_TAG_BITRATE, GST_TAG_FLAG_ENCODED,
163 _("exact or average bitrate in bits/s"),
165 gst_tag_register (GST_TAG_NOMINAL_BITRATE, GST_TAG_FLAG_ENCODED,
167 _("nominal bitrate"),
168 _("nominal bitrate in bits/s"),
170 gst_tag_register (GST_TAG_MINIMUM_BITRATE, GST_TAG_FLAG_ENCODED,
172 _("minimum bitrate"),
173 _("minimum bitrate in bits/s"),
175 gst_tag_register (GST_TAG_MAXIMUM_BITRATE, GST_TAG_FLAG_ENCODED,
177 _("maximum bitrate"),
178 _("maximum bitrate in bits/s"),
180 gst_tag_register (GST_TAG_ENCODER, GST_TAG_FLAG_ENCODED,
183 _("encoder used to encode this stream"),
185 gst_tag_register (GST_TAG_ENCODER_VERSION, GST_TAG_FLAG_ENCODED,
187 _("encoder version"),
188 _("version of the encoder used to encode this stream"),
190 gst_tag_register (GST_TAG_SERIAL, GST_TAG_FLAG_ENCODED,
193 _("serial number of track"),
195 gst_tag_register (GST_TAG_TRACK_GAIN, GST_TAG_FLAG_META,
197 _("replaygain track gain"),
198 _("track gain in db"),
200 gst_tag_register (GST_TAG_TRACK_PEAK, GST_TAG_FLAG_META,
202 _("replaygain track peak"),
203 _("peak of the track"),
205 gst_tag_register (GST_TAG_ALBUM_GAIN, GST_TAG_FLAG_META,
207 _("replaygain album gain"),
208 _("album gain in db"),
210 gst_tag_register (GST_TAG_ALBUM_PEAK, GST_TAG_FLAG_META,
212 _("replaygain album peak"),
213 _("peak of the album"),
217 * gst_tag_merge_use_first:
218 * @dest: uninitialized GValue to store result in
219 * @src: GValue to copy from
221 * This is a convenience function for the func argument of gst_tag_register().
222 * It creates a copy of the first value from the list.
225 gst_tag_merge_use_first (GValue *dest, const GValue *src)
227 const GValue *ret = gst_value_list_get_value (src, 0);
229 g_value_init (dest, G_VALUE_TYPE (ret));
230 g_value_copy (ret, dest);
233 * gst_tag_merge_strings_with_comma:
234 * @dest: uninitialized GValue to store result in
235 * @src: GValue to copy from
237 * This is a convenience function for the func argument of gst_tag_register().
238 * It concatenates all given strings using a comma. The tag must be registered
239 * as a G_TYPE_STRING or this function will fail.
242 gst_tag_merge_strings_with_comma (GValue *dest, const GValue *src)
247 count = gst_value_list_get_size (src);
248 str = g_string_new (g_value_get_string (gst_value_list_get_value (src, 0)));
249 for (i = 1; i < count; i++) {
250 /* seperator between two string */
251 str = g_string_append (str, _(", "));
252 str = g_string_append (str, g_value_get_string (gst_value_list_get_value (src, 1)));
255 g_value_init (dest, G_TYPE_STRING);
256 g_value_set_string_take_ownership (dest, str->str);
257 g_string_free (str, FALSE);
260 gst_tag_lookup (GQuark entry)
265 ret = g_hash_table_lookup (__tags, GUINT_TO_POINTER (entry));
272 * @name: the name or identifier string
273 * @flag: a flag describing the type of tag info
274 * @type: the type this data is in
275 * @nick: human-readable name
276 * @blurb: a human-readable description about this tag
277 * @func: function for merging multiple values of this tag
279 * Registers a new tag type for the use with GStreamer's type system. If a type
280 * with that name is already registered, that one is used.
281 * The old registration may have used a different type however. So don't rely
282 * on your supplied values.
283 * This function takes ownership of all supplied variables.
286 gst_tag_register (gchar *name, GstTagFlag flag, GType type,
287 gchar *nick, gchar *blurb, GstTagMergeFunc func)
292 g_return_if_fail (name != NULL);
293 g_return_if_fail (nick != NULL);
294 g_return_if_fail (blurb != NULL);
295 g_return_if_fail (type != 0 && type != GST_TYPE_LIST);
297 key = g_quark_from_string (name);
298 info = gst_tag_lookup (key);
299 g_return_if_fail (info == NULL);
301 info = g_new (GstTagInfo, 1);
306 info->merge_func = func;
309 g_hash_table_insert (__tags, GUINT_TO_POINTER (key), info);
314 * @tag: name of the tag
316 * Checks if the given type is already registered.
318 * Returns: TRUE if the type is already registered
321 gst_tag_exists (const gchar *tag)
323 g_return_val_if_fail (tag != NULL, FALSE);
325 return gst_tag_lookup (g_quark_from_string (tag)) != NULL;
331 * Gets the #GType used for this tag.
333 * Returns: the #GType of this tag
336 gst_tag_get_type (const gchar *tag)
340 g_return_val_if_fail (tag != NULL, 0);
341 info = gst_tag_lookup (g_quark_from_string (tag));
342 g_return_val_if_fail (info != NULL, 0);
350 * Returns the human-readable name of this tag, You must not change or free
353 * Returns: the human-readable name of this tag
356 gst_tag_get_nick (const gchar *tag)
360 g_return_val_if_fail (tag != NULL, NULL);
361 info = gst_tag_lookup (g_quark_from_string (tag));
362 g_return_val_if_fail (info != NULL, NULL);
367 * gst_tag_get_description:
370 * Returns the human-readable description of this tag, You must not change or
373 * Return the human-readable description of this tag
376 gst_tag_get_description (const gchar *tag)
380 g_return_val_if_fail (tag != NULL, NULL);
381 info = gst_tag_lookup (g_quark_from_string (tag));
382 g_return_val_if_fail (info != NULL, NULL);
387 * gst_tag_list_is_fixed:
390 * Checks if the given tag is fixed. A fixed tag can only contain one value.
391 * Unfixed tags can contain lists of values.
393 * Returns: TRUE, if the given tag is fixed.
396 gst_tag_is_fixed (const gchar *tag)
400 g_return_val_if_fail (tag != NULL, FALSE);
401 info = gst_tag_lookup (g_quark_from_string (tag));
402 g_return_val_if_fail (info != NULL, FALSE);
404 return info->merge_func == NULL;
409 * Creates a new empty GstTagList.
411 * Returns: An empty tag list
414 gst_tag_list_new (void)
416 return GST_TAG_LIST (gst_structure_new (TAGLIST, NULL));
420 * @p: Object that might be a taglist
422 * Checks if the given pointer is a taglist.
424 * Returns: TRUE, if the given pointer is a taglist
427 gst_is_tag_list (gconstpointer p)
429 g_return_val_if_fail (p != NULL, FALSE);
431 return ((GstStructure *) p)->name == gst_tag_list_quark;
435 GstTagMergeMode mode;
438 gst_tag_list_add_value_internal (GstStructure *list, GstTagMergeMode mode, GQuark tag, GValue *value)
440 GstTagInfo *info = gst_tag_lookup (tag);
441 const GValue *value2;
443 g_assert (info != NULL);
445 if (info->merge_func && (value2 = gst_structure_id_get_value (list, tag)) != NULL) {
446 GValue dest = { 0, };
448 case GST_TAG_MERGE_REPLACE_ALL:
449 case GST_TAG_MERGE_REPLACE:
450 gst_structure_id_set_value (list, tag, value);
452 case GST_TAG_MERGE_PREPEND:
453 gst_value_list_concat (&dest, value, value2);
454 gst_structure_id_set_value (list, tag, &dest);
455 g_value_unset (&dest);
457 case GST_TAG_MERGE_APPEND:
458 gst_value_list_concat (&dest, value2, value);
459 gst_structure_id_set_value (list, tag, &dest);
460 g_value_unset (&dest);
462 case GST_TAG_MERGE_KEEP:
463 case GST_TAG_MERGE_KEEP_ALL:
466 g_assert_not_reached ();
471 case GST_TAG_MERGE_APPEND:
472 case GST_TAG_MERGE_KEEP:
473 if (gst_structure_id_get_value (list, tag) != NULL)
476 case GST_TAG_MERGE_REPLACE_ALL:
477 case GST_TAG_MERGE_REPLACE:
478 case GST_TAG_MERGE_PREPEND:
479 gst_structure_id_set_value (list, tag, value);
481 case GST_TAG_MERGE_KEEP_ALL:
484 g_assert_not_reached ();
490 gst_tag_list_copy_foreach (GQuark tag, GValue *value, gpointer user_data)
492 GstTagCopyData *copy = (GstTagCopyData *) user_data;
494 gst_tag_list_add_value_internal (copy->list, copy->mode, tag, value);
499 * gst_tag_list_insert:
500 * @into: list to merge into
501 * @from: list to merge from
502 * @mode: the mode to use
504 * Inserts the tags of the second list into the first list using the given mode.
507 gst_tag_list_insert (GstTagList *into, const GstTagList *from, GstTagMergeMode mode)
511 g_return_if_fail (GST_IS_TAG_LIST (into));
512 g_return_if_fail (GST_IS_TAG_LIST (from));
513 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
515 data.list = (GstStructure *) into;
517 if (mode == GST_TAG_MERGE_REPLACE_ALL) {
518 gst_structure_remove_all_fields (data.list);
520 gst_structure_foreach ((GstStructure *) from, gst_tag_list_copy_foreach, &data);
524 * @list: list to copy
526 * Copies a given #GstTagList.
528 * Returns: copy of the given list
531 gst_tag_list_copy (const GstTagList *list)
533 g_return_val_if_fail (GST_IS_TAG_LIST (list), NULL);
535 return GST_TAG_LIST (gst_structure_copy ((GstStructure *) list));
538 * gst_tag_list_merge:
539 * @list1: first list to merge
540 * @list2: second list to merge
541 * @mode: the mode to use
543 * Merges the two given lists into a new list. If one of the lists is NULL, a
544 * copy of the other is returned. If both lists are NULL, NULL is returned.
546 * Returns: the new list
549 gst_tag_list_merge (const GstTagList *list1, const GstTagList *list2, GstTagMergeMode mode)
551 g_return_val_if_fail (list1 == NULL || GST_IS_TAG_LIST (list1), NULL);
552 g_return_val_if_fail (list2 == NULL || GST_IS_TAG_LIST (list2), NULL);
553 g_return_val_if_fail (GST_TAG_MODE_IS_VALID (mode), NULL);
555 if (!list1 && !list2) {
558 return gst_tag_list_copy (list2);
560 return gst_tag_list_copy (list1);
564 ret = gst_tag_list_copy (list1);
565 gst_tag_list_insert (ret, list2, mode);
571 * @list: the list to free
573 * Frees the given list and all associated values.
576 gst_tag_list_free (GstTagList *list)
578 g_return_if_fail (GST_IS_TAG_LIST (list));
579 gst_structure_free ((GstStructure *) list);
582 * gst_tag_list_get_tag_size:
584 * @tag: the tag to query
586 * Checks how many value are stored in this tag list for the given tag.
588 * Returns: The number of tags stored
591 gst_tag_list_get_tag_size (const GstTagList *list, const gchar *tag)
595 g_return_val_if_fail (GST_IS_TAG_LIST (list), 0);
597 value = gst_structure_get_value ((GstStructure *) list, tag);
600 if (G_VALUE_TYPE (value) != GST_TYPE_LIST)
603 return gst_value_list_get_size (value);
607 * @list: list to set tags in
608 * @mode: the mode to use
610 * @...: NULL-terminated list of values to set
612 * Sets the values for the given tags using the specified mode.
615 gst_tag_list_add (GstTagList *list, GstTagMergeMode mode, const gchar *tag, ...)
619 g_return_if_fail (GST_IS_TAG_LIST (list));
620 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
621 g_return_if_fail (tag != NULL);
623 va_start (args, tag);
624 gst_tag_list_add_valist (list, mode, tag, args);
628 * gst_tag_list_add_values:
629 * @list: list to set tags in
630 * @mode: the mode to use
632 * @...: GValues to set
634 * Sets the GValues for the given tags using the specified mode.
637 gst_tag_list_add_values (GstTagList *list, GstTagMergeMode mode, const gchar *tag, ...)
641 g_return_if_fail (GST_IS_TAG_LIST (list));
642 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
643 g_return_if_fail (tag != NULL);
645 va_start (args, tag);
646 gst_tag_list_add_valist_values (list, mode, tag, args);
650 * gst_tag_list_add_valist:
651 * @list: list to set tags in
652 * @mode: the mode to use
654 * @var_args: tag / value pairs to set
656 * Sets the values for the given tags using the specified mode.
659 gst_tag_list_add_valist (GstTagList *list, GstTagMergeMode mode, const gchar *tag, va_list var_args)
665 g_return_if_fail (GST_IS_TAG_LIST (list));
666 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
667 g_return_if_fail (tag != NULL);
669 while (tag != NULL) {
670 GValue value = { 0, };
671 quark = g_quark_from_string (tag);
672 info = gst_tag_lookup (quark);
674 g_warning ("no GstTag for %s", tag);
675 g_return_if_fail (info != NULL);
676 g_value_init (&value, info->type);
677 G_VALUE_COLLECT (&value, var_args, 0, &error);
679 g_warning ("%s: %s", G_STRLOC, error);
681 /* we purposely leak the value here, it might not be
682 * in a sane state if an error condition occoured
686 gst_tag_list_add_value_internal (list, mode, quark, &value);
687 g_value_unset (&value);
688 tag = va_arg (var_args, gchar *);
692 * gst_tag_list_add_valist_values:
693 * @list: list to set tags in
694 * @mode: the mode to use
696 * @var_args: tag / GValue pairs to set
698 * Sets the GValues for the given tags using the specified mode.
701 gst_tag_list_add_valist_values (GstTagList *list, GstTagMergeMode mode, const gchar *tag, va_list var_args)
706 g_return_if_fail (GST_IS_TAG_LIST (list));
707 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
708 g_return_if_fail (tag != NULL);
710 while (tag != NULL) {
711 quark = g_quark_from_string (tag);
712 info = gst_tag_lookup (quark);
713 g_return_if_fail (info != NULL);
714 gst_tag_list_add_value_internal (list, mode, quark, va_arg (var_args, GValue *));
715 tag = va_arg (var_args, gchar *);
719 * gst_tag_list_remove_tag:
720 * @list: list to remove tag from
721 * @tag: tag to remove
723 * Removes the goven tag from the taglist.
726 gst_tag_list_remove_tag (GstTagList *list, const gchar *tag)
728 g_return_if_fail (GST_IS_TAG_LIST (list));
729 g_return_if_fail (tag != NULL);
731 gst_structure_remove_field ((GstStructure *) list, tag);
734 GstTagForeachFunc func;
735 GstTagList * tag_list;
739 structure_foreach_wrapper (GQuark field_id,
740 GValue *value, gpointer user_data)
742 TagForeachData *data = (TagForeachData *) user_data;
743 data->func (data->tag_list, g_quark_to_string (field_id), data->data);
747 * gst_tag_list_foreach:
748 * @list: list to iterate over
749 * @func: function to be called for each tag
750 * @user_data: user specified data
752 * Calls the given function for each tag inside the tag list. Note that if there
753 * is no tag, the function won't be called at all.
756 gst_tag_list_foreach (GstTagList *list, GstTagForeachFunc func, gpointer user_data)
760 g_return_if_fail (GST_IS_TAG_LIST (list));
761 g_return_if_fail (func != NULL);
764 data.tag_list = list;
765 data.data = user_data;
766 gst_structure_foreach ((GstStructure *) list, structure_foreach_wrapper, &data);
769 /***** tag events *****/
773 * @list: the tag list to put into the event or NULL for an empty list
775 * Creates a new tag event with the given list and takes ownership of it.
777 * Returns: a new tag event
780 gst_event_new_tag (GstTagList *list)
784 g_return_val_if_fail (list == NULL || GST_IS_TAG_LIST (list), NULL);
786 ret = gst_event_new (GST_EVENT_TAG);
788 list = gst_tag_list_new ();
789 ret->event_data.structure.structure = (GstStructure *) list;
794 * get_event_tag_get_list:
795 * @tag_event: a tagging #GstEvent
797 * Gets the taglist from a given tagging event.
799 * Returns: The #GstTagList of the event
802 gst_event_tag_get_list (GstEvent *tag_event)
804 g_return_val_if_fail (GST_IS_EVENT (tag_event), NULL);
805 g_return_val_if_fail (GST_EVENT_TYPE (tag_event) == GST_EVENT_TAG, NULL);
807 return GST_TAG_LIST (tag_event->event_data.structure.structure);
811 * gst_tag_list_get_value_index:
812 * @list: a #GStTagList
813 * @tag: tag to read out
814 * @index: number of entry to read out
816 * Gets the value that is at the given index for the given tag in the given
819 * Returns: The GValue for the specified entry or NULL if the tag wasn't available
820 * or the tag doesn't have as many entries
822 G_CONST_RETURN GValue *
823 gst_tag_list_get_value_index (const GstTagList *list, const gchar *tag, guint index)
827 g_return_val_if_fail (GST_IS_TAG_LIST (list), NULL);
828 g_return_val_if_fail (tag != NULL, NULL);
830 value = gst_structure_get_value ((GstStructure *) list, tag);
831 if (value == NULL) return NULL;
833 if (GST_VALUE_HOLDS_LIST (value)) {
834 if (index >= gst_value_list_get_size (value)) return NULL;
835 return gst_value_list_get_value (value, index);
837 if (index > 0) return NULL;
843 * gst_tag_list_copy_value:
844 * @dest: uninitialized #GValue to copy into
845 * @list: list to get the tag from
846 * @tag: tag to read out
848 * Copies the contents for the given tag into the value, merging multiple values
849 * into one if multiple values are associated with the tag.
850 * You must g_value_unset() the value after use.
852 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
856 gst_tag_list_copy_value (GValue *dest, const GstTagList *list, const gchar *tag)
860 g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE);
861 g_return_val_if_fail (tag != NULL, FALSE);
862 g_return_val_if_fail (dest != NULL, FALSE);
863 g_return_val_if_fail (G_VALUE_TYPE (dest) == 0, FALSE);
865 src = gst_structure_get_value ((GstStructure *) list, tag);
866 if (!src) return FALSE;
868 if (G_VALUE_TYPE (src) == GST_TYPE_LIST) {
869 GstTagInfo *info = gst_tag_lookup (g_quark_from_string (tag));
870 /* must be there or lists aren't allowed */
871 g_assert (info->merge_func);
872 info->merge_func (dest, src);
874 g_value_init (dest, G_VALUE_TYPE (src));
875 g_value_copy (src, dest);
880 /***** evil macros to get all the gst_tag_list_get_*() functions right *****/
882 #define TAG_MERGE_FUNCS(name,type) \
884 gst_tag_list_get_ ## name (const GstTagList *list, const gchar *tag, \
889 g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE); \
890 g_return_val_if_fail (tag != NULL, FALSE); \
891 g_return_val_if_fail (value != NULL, FALSE); \
893 if (!gst_tag_list_copy_value (&v, list, tag)) \
895 *value = COPY_FUNC (g_value_get_ ## name (&v)); \
896 g_value_unset (&v); \
901 gst_tag_list_get_ ## name ## _index (const GstTagList *list, const gchar *tag, \
902 guint index, type *value) \
906 g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE); \
907 g_return_val_if_fail (tag != NULL, FALSE); \
908 g_return_val_if_fail (value != NULL, FALSE); \
910 if ((v = gst_tag_list_get_value_index (list, tag, index)) == NULL) \
912 *value = COPY_FUNC (g_value_get_ ## name (v)); \
916 #define COPY_FUNC /**/
917 TAG_MERGE_FUNCS (char, gchar)
918 TAG_MERGE_FUNCS (uchar, guchar)
919 TAG_MERGE_FUNCS (boolean, gboolean)
920 TAG_MERGE_FUNCS (int, gint)
921 TAG_MERGE_FUNCS (uint, guint)
922 TAG_MERGE_FUNCS (long, glong)
923 TAG_MERGE_FUNCS (ulong, gulong)
924 TAG_MERGE_FUNCS (int64, gint64)
925 TAG_MERGE_FUNCS (uint64, guint64)
926 TAG_MERGE_FUNCS (float, gfloat)
927 TAG_MERGE_FUNCS (double, gdouble)
930 #define COPY_FUNC g_strdup
931 TAG_MERGE_FUNCS (string, gchar *)