| /* GStreamer |
| * Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de> |
| * |
| * gsttaglist.c: tag support (aka metadata) |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public |
| * License along with this library; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 02111-1307, USA. |
| */ |
| |
| /** |
| * SECTION:gsttaglist |
| * @short_description: List of tags and values used to describe media metadata |
| * |
| * List of tags and values used to describe media metadata. |
| * |
| * Last reviewed on 2005-11-23 (0.9.5) |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| # include "config.h" |
| #endif |
| |
| #include "gst_private.h" |
| #include "gst-i18n-lib.h" |
| #include "gsttaglist.h" |
| #include "gstinfo.h" |
| #include "gstvalue.h" |
| #include "gstbuffer.h" |
| |
| #include <gobject/gvaluecollector.h> |
| #include <string.h> |
| |
| #define GST_TAG_IS_VALID(tag) (gst_tag_get_info (tag) != NULL) |
| |
| /* FIXME 0.11: use GParamSpecs or something similar for tag registrations, |
| * possibly even gst_tag_register(). Especially value ranges might be |
| * useful for some tags. */ |
| |
| typedef struct |
| { |
| GType type; /* type the data is in */ |
| |
| gchar *nick; /* translated name */ |
| gchar *blurb; /* translated description of type */ |
| |
| GstTagMergeFunc merge_func; /* functions to merge the values */ |
| GstTagFlag flag; /* type of tag */ |
| } |
| GstTagInfo; |
| |
| #define TAGLIST "taglist" |
| static GQuark gst_tag_list_quark; |
| static GMutex *__tag_mutex; |
| static GHashTable *__tags; |
| |
| #define TAG_LOCK g_mutex_lock (__tag_mutex) |
| #define TAG_UNLOCK g_mutex_unlock (__tag_mutex) |
| |
| GType |
| gst_tag_list_get_type (void) |
| { |
| static GType _gst_tag_list_type = 0; |
| |
| if (G_UNLIKELY (_gst_tag_list_type == 0)) { |
| _gst_tag_list_type = g_boxed_type_register_static ("GstTagList", |
| (GBoxedCopyFunc) gst_tag_list_copy, (GBoxedFreeFunc) gst_tag_list_free); |
| |
| #if 0 |
| g_value_register_transform_func (_gst_tag_list_type, G_TYPE_STRING, |
| _gst_structure_transform_to_string); |
| #endif |
| } |
| |
| return _gst_tag_list_type; |
| } |
| |
| void |
| _gst_tag_initialize (void) |
| { |
| gst_tag_list_quark = g_quark_from_static_string (TAGLIST); |
| __tag_mutex = g_mutex_new (); |
| __tags = g_hash_table_new (g_direct_hash, g_direct_equal); |
| gst_tag_register (GST_TAG_TITLE, GST_TAG_FLAG_META, |
| G_TYPE_STRING, |
| _("title"), _("commonly used title"), gst_tag_merge_strings_with_comma); |
| gst_tag_register (GST_TAG_ARTIST, GST_TAG_FLAG_META, |
| G_TYPE_STRING, |
| _("artist"), |
| _("person(s) responsible for the recording"), |
| gst_tag_merge_strings_with_comma); |
| gst_tag_register (GST_TAG_ALBUM, GST_TAG_FLAG_META, |
| G_TYPE_STRING, |
| _("album"), |
| _("album containing this data"), gst_tag_merge_strings_with_comma); |
| gst_tag_register (GST_TAG_DATE, GST_TAG_FLAG_META, GST_TYPE_DATE, |
| _("date"), _("date the data was created (as a GDate structure)"), NULL); |
| gst_tag_register (GST_TAG_GENRE, GST_TAG_FLAG_META, |
| G_TYPE_STRING, |
| _("genre"), |
| _("genre this data belongs to"), gst_tag_merge_strings_with_comma); |
| gst_tag_register (GST_TAG_COMMENT, GST_TAG_FLAG_META, |
| G_TYPE_STRING, |
| _("comment"), |
| _("free text commenting the data"), gst_tag_merge_use_first); |
| gst_tag_register (GST_TAG_EXTENDED_COMMENT, GST_TAG_FLAG_META, |
| G_TYPE_STRING, |
| _("extended comment"), |
| _("free text commenting the data in key=value or key[en]=comment form"), |
| gst_tag_merge_use_first); |
| gst_tag_register (GST_TAG_TRACK_NUMBER, GST_TAG_FLAG_META, |
| G_TYPE_UINT, |
| _("track number"), |
| _("track number inside a collection"), gst_tag_merge_use_first); |
| gst_tag_register (GST_TAG_TRACK_COUNT, GST_TAG_FLAG_META, |
| G_TYPE_UINT, |
| _("track count"), |
| _("count of tracks inside collection this track belongs to"), |
| gst_tag_merge_use_first); |
| gst_tag_register (GST_TAG_ALBUM_VOLUME_NUMBER, GST_TAG_FLAG_META, |
| G_TYPE_UINT, |
| _("disc number"), |
| _("disc number inside a collection"), gst_tag_merge_use_first); |
| gst_tag_register (GST_TAG_ALBUM_VOLUME_COUNT, GST_TAG_FLAG_META, |
| G_TYPE_UINT, |
| _("disc count"), |
| _("count of discs inside collection this disc belongs to"), |
| gst_tag_merge_use_first); |
| gst_tag_register (GST_TAG_LOCATION, GST_TAG_FLAG_META, |
| G_TYPE_STRING, |
| _("location"), |
| _("original location of file as a URI"), |
| gst_tag_merge_strings_with_comma); |
| gst_tag_register (GST_TAG_DESCRIPTION, GST_TAG_FLAG_META, |
| G_TYPE_STRING, |
| _("description"), |
| _("short text describing the content of the data"), |
| gst_tag_merge_strings_with_comma); |
| gst_tag_register (GST_TAG_VERSION, GST_TAG_FLAG_META, |
| G_TYPE_STRING, _("version"), _("version of this data"), NULL); |
| gst_tag_register (GST_TAG_ISRC, GST_TAG_FLAG_META, |
| G_TYPE_STRING, |
| _("ISRC"), |
| _ |
| ("International Standard Recording Code - see http://www.ifpi.org/isrc/"), |
| NULL); |
| gst_tag_register (GST_TAG_ORGANIZATION, GST_TAG_FLAG_META, G_TYPE_STRING, _("organization"), _("organization"), /* FIXME */ |
| gst_tag_merge_strings_with_comma); |
| gst_tag_register (GST_TAG_COPYRIGHT, GST_TAG_FLAG_META, |
| G_TYPE_STRING, _("copyright"), _("copyright notice of the data"), NULL); |
| gst_tag_register (GST_TAG_CONTACT, GST_TAG_FLAG_META, |
| G_TYPE_STRING, |
| _("contact"), _("contact information"), gst_tag_merge_strings_with_comma); |
| gst_tag_register (GST_TAG_LICENSE, GST_TAG_FLAG_META, |
| G_TYPE_STRING, _("license"), _("license of data"), NULL); |
| gst_tag_register (GST_TAG_PERFORMER, GST_TAG_FLAG_META, |
| G_TYPE_STRING, |
| _("performer"), |
| _("person(s) performing"), gst_tag_merge_strings_with_comma); |
| gst_tag_register (GST_TAG_DURATION, GST_TAG_FLAG_DECODED, |
| G_TYPE_UINT64, |
| _("duration"), _("length in GStreamer time units (nanoseconds)"), NULL); |
| gst_tag_register (GST_TAG_CODEC, GST_TAG_FLAG_ENCODED, |
| G_TYPE_STRING, |
| _("codec"), |
| _("codec the data is stored in"), gst_tag_merge_strings_with_comma); |
| gst_tag_register (GST_TAG_VIDEO_CODEC, GST_TAG_FLAG_ENCODED, |
| G_TYPE_STRING, |
| _("video codec"), _("codec the video data is stored in"), NULL); |
| gst_tag_register (GST_TAG_AUDIO_CODEC, GST_TAG_FLAG_ENCODED, |
| G_TYPE_STRING, |
| _("audio codec"), _("codec the audio data is stored in"), NULL); |
| gst_tag_register (GST_TAG_BITRATE, GST_TAG_FLAG_ENCODED, |
| G_TYPE_UINT, _("bitrate"), _("exact or average bitrate in bits/s"), NULL); |
| gst_tag_register (GST_TAG_NOMINAL_BITRATE, GST_TAG_FLAG_ENCODED, |
| G_TYPE_UINT, _("nominal bitrate"), _("nominal bitrate in bits/s"), NULL); |
| gst_tag_register (GST_TAG_MINIMUM_BITRATE, GST_TAG_FLAG_ENCODED, |
| G_TYPE_UINT, _("minimum bitrate"), _("minimum bitrate in bits/s"), NULL); |
| gst_tag_register (GST_TAG_MAXIMUM_BITRATE, GST_TAG_FLAG_ENCODED, |
| G_TYPE_UINT, _("maximum bitrate"), _("maximum bitrate in bits/s"), NULL); |
| gst_tag_register (GST_TAG_ENCODER, GST_TAG_FLAG_ENCODED, |
| G_TYPE_STRING, |
| _("encoder"), _("encoder used to encode this stream"), NULL); |
| gst_tag_register (GST_TAG_ENCODER_VERSION, GST_TAG_FLAG_ENCODED, |
| G_TYPE_UINT, |
| _("encoder version"), |
| _("version of the encoder used to encode this stream"), NULL); |
| gst_tag_register (GST_TAG_SERIAL, GST_TAG_FLAG_ENCODED, |
| G_TYPE_UINT, _("serial"), _("serial number of track"), NULL); |
| gst_tag_register (GST_TAG_TRACK_GAIN, GST_TAG_FLAG_META, |
| G_TYPE_DOUBLE, _("replaygain track gain"), _("track gain in db"), NULL); |
| gst_tag_register (GST_TAG_TRACK_PEAK, GST_TAG_FLAG_META, |
| G_TYPE_DOUBLE, _("replaygain track peak"), _("peak of the track"), NULL); |
| gst_tag_register (GST_TAG_ALBUM_GAIN, GST_TAG_FLAG_META, |
| G_TYPE_DOUBLE, _("replaygain album gain"), _("album gain in db"), NULL); |
| gst_tag_register (GST_TAG_ALBUM_PEAK, GST_TAG_FLAG_META, |
| G_TYPE_DOUBLE, _("replaygain album peak"), _("peak of the album"), NULL); |
| gst_tag_register (GST_TAG_LANGUAGE_CODE, GST_TAG_FLAG_META, G_TYPE_STRING, |
| _("language code"), |
| _("language code for this stream, conforming to ISO-639-1"), NULL); |
| gst_tag_register (GST_TAG_IMAGE, GST_TAG_FLAG_META, GST_TYPE_BUFFER, |
| _("image"), _("image related to this stream"), gst_tag_merge_use_first); |
| gst_tag_register (GST_TAG_PREVIEW_IMAGE, GST_TAG_FLAG_META, GST_TYPE_BUFFER, |
| _("preview image"), _("preview image related to this stream"), NULL); |
| } |
| |
| /** |
| * gst_tag_merge_use_first: |
| * @dest: uninitialized GValue to store result in |
| * @src: GValue to copy from |
| * |
| * This is a convenience function for the func argument of gst_tag_register(). |
| * It creates a copy of the first value from the list. |
| */ |
| void |
| gst_tag_merge_use_first (GValue * dest, const GValue * src) |
| { |
| const GValue *ret = gst_value_list_get_value (src, 0); |
| |
| g_value_init (dest, G_VALUE_TYPE (ret)); |
| g_value_copy (ret, dest); |
| } |
| |
| /** |
| * gst_tag_merge_strings_with_comma: |
| * @dest: uninitialized GValue to store result in |
| * @src: GValue to copy from |
| * |
| * This is a convenience function for the func argument of gst_tag_register(). |
| * It concatenates all given strings using a comma. The tag must be registered |
| * as a G_TYPE_STRING or this function will fail. |
| */ |
| void |
| gst_tag_merge_strings_with_comma (GValue * dest, const GValue * src) |
| { |
| GString *str; |
| gint i, count; |
| |
| count = gst_value_list_get_size (src); |
| str = g_string_new (g_value_get_string (gst_value_list_get_value (src, 0))); |
| for (i = 1; i < count; i++) { |
| /* seperator between two string */ |
| str = g_string_append (str, _(", ")); |
| str = |
| g_string_append (str, g_value_get_string (gst_value_list_get_value (src, |
| 1))); |
| } |
| |
| g_value_init (dest, G_TYPE_STRING); |
| g_value_set_string_take_ownership (dest, str->str); |
| g_string_free (str, FALSE); |
| } |
| static GstTagInfo * |
| gst_tag_lookup (GQuark entry) |
| { |
| GstTagInfo *ret; |
| |
| TAG_LOCK; |
| ret = g_hash_table_lookup (__tags, GUINT_TO_POINTER (entry)); |
| TAG_UNLOCK; |
| |
| return ret; |
| } |
| |
| /** |
| * gst_tag_register: |
| * @name: the name or identifier string |
| * @flag: a flag describing the type of tag info |
| * @type: the type this data is in |
| * @nick: human-readable name |
| * @blurb: a human-readable description about this tag |
| * @func: function for merging multiple values of this tag, or NULL |
| * |
| * Registers a new tag type for the use with GStreamer's type system. If a type |
| * with that name is already registered, that one is used. |
| * The old registration may have used a different type however. So don't rely |
| * on your supplied values. |
| * |
| * Important: if you do not supply a merge function the implication will be |
| * that there can only be one single value for this tag in a tag list and |
| * any additional values will silenty be discarded when being added (unless |
| * #GST_TAG_MERGE_REPLACE, #GST_TAG_MERGE_REPLACE_ALL, or |
| * #GST_TAG_MERGE_PREPEND is used as merge mode, in which case the new |
| * value will replace the old one in the list). |
| * |
| * The merge function will be called from gst_tag_list_copy_value() when |
| * it is required that one or more values for a tag be condensed into |
| * one single value. This may happen from gst_tag_list_get_string(), |
| * gst_tag_list_get_int(), gst_tag_list_get_double() etc. What will happen |
| * exactly in that case depends on how the tag was registered and if a |
| * merge function was supplied and if so which one. |
| * |
| * Two default merge functions are provided: gst_tag_merge_use_first() and |
| * gst_tag_merge_strings_with_commas(). |
| */ |
| void |
| gst_tag_register (const gchar * name, GstTagFlag flag, GType type, |
| const gchar * nick, const gchar * blurb, GstTagMergeFunc func) |
| { |
| GQuark key; |
| GstTagInfo *info; |
| |
| g_return_if_fail (name != NULL); |
| g_return_if_fail (nick != NULL); |
| g_return_if_fail (blurb != NULL); |
| g_return_if_fail (type != 0 && type != GST_TYPE_LIST); |
| |
| key = g_quark_from_string (name); |
| info = gst_tag_lookup (key); |
| |
| if (info) { |
| g_return_if_fail (info->type == type); |
| return; |
| } |
| |
| info = g_new (GstTagInfo, 1); |
| info->flag = flag; |
| info->type = type; |
| info->nick = g_strdup (nick); |
| info->blurb = g_strdup (blurb); |
| info->merge_func = func; |
| |
| TAG_LOCK; |
| g_hash_table_insert (__tags, GUINT_TO_POINTER (key), info); |
| TAG_UNLOCK; |
| } |
| |
| /** |
| * gst_tag_exists: |
| * @tag: name of the tag |
| * |
| * Checks if the given type is already registered. |
| * |
| * Returns: TRUE if the type is already registered |
| */ |
| gboolean |
| gst_tag_exists (const gchar * tag) |
| { |
| g_return_val_if_fail (tag != NULL, FALSE); |
| |
| return gst_tag_lookup (g_quark_from_string (tag)) != NULL; |
| } |
| |
| /** |
| * gst_tag_get_type: |
| * @tag: the tag |
| * |
| * Gets the #GType used for this tag. |
| * |
| * Returns: the #GType of this tag |
| */ |
| GType |
| gst_tag_get_type (const gchar * tag) |
| { |
| GstTagInfo *info; |
| |
| g_return_val_if_fail (tag != NULL, 0); |
| info = gst_tag_lookup (g_quark_from_string (tag)); |
| g_return_val_if_fail (info != NULL, 0); |
| |
| return info->type; |
| } |
| |
| /** |
| * gst_tag_get_nick |
| * @tag: the tag |
| * |
| * Returns the human-readable name of this tag, You must not change or free |
| * this string. |
| * |
| * Returns: the human-readable name of this tag |
| */ |
| const gchar * |
| gst_tag_get_nick (const gchar * tag) |
| { |
| GstTagInfo *info; |
| |
| g_return_val_if_fail (tag != NULL, NULL); |
| info = gst_tag_lookup (g_quark_from_string (tag)); |
| g_return_val_if_fail (info != NULL, NULL); |
| |
| return info->nick; |
| } |
| |
| /** |
| * gst_tag_get_description: |
| * @tag: the tag |
| * |
| * Returns the human-readable description of this tag, You must not change or |
| * free this string. |
| * |
| * Returns: the human-readable description of this tag |
| */ |
| const gchar * |
| gst_tag_get_description (const gchar * tag) |
| { |
| GstTagInfo *info; |
| |
| g_return_val_if_fail (tag != NULL, NULL); |
| info = gst_tag_lookup (g_quark_from_string (tag)); |
| g_return_val_if_fail (info != NULL, NULL); |
| |
| return info->blurb; |
| } |
| |
| /** |
| * gst_tag_get_flag: |
| * @tag: the tag |
| * |
| * Gets the flag of @tag. |
| * |
| * Returns the flag of this tag. |
| */ |
| GstTagFlag |
| gst_tag_get_flag (const gchar * tag) |
| { |
| GstTagInfo *info; |
| |
| g_return_val_if_fail (tag != NULL, GST_TAG_FLAG_UNDEFINED); |
| info = gst_tag_lookup (g_quark_from_string (tag)); |
| g_return_val_if_fail (info != NULL, GST_TAG_FLAG_UNDEFINED); |
| |
| return info->flag; |
| } |
| |
| /** |
| * gst_tag_is_fixed: |
| * @tag: tag to check |
| * |
| * Checks if the given tag is fixed. A fixed tag can only contain one value. |
| * Unfixed tags can contain lists of values. |
| * |
| * Returns: TRUE, if the given tag is fixed. |
| */ |
| gboolean |
| gst_tag_is_fixed (const gchar * tag) |
| { |
| GstTagInfo *info; |
| |
| g_return_val_if_fail (tag != NULL, FALSE); |
| info = gst_tag_lookup (g_quark_from_string (tag)); |
| g_return_val_if_fail (info != NULL, FALSE); |
| |
| return info->merge_func == NULL; |
| } |
| |
| /** |
| * gst_tag_list_new: |
| * |
| * Creates a new empty GstTagList. |
| * |
| * Returns: An empty tag list |
| */ |
| GstTagList * |
| gst_tag_list_new (void) |
| { |
| return GST_TAG_LIST (gst_structure_new (TAGLIST, NULL)); |
| } |
| |
| /** |
| * gst_is_tag_list: |
| * @p: Object that might be a taglist |
| * |
| * Checks if the given pointer is a taglist. |
| * |
| * Returns: TRUE, if the given pointer is a taglist |
| */ |
| gboolean |
| gst_is_tag_list (gconstpointer p) |
| { |
| g_return_val_if_fail (p != NULL, FALSE); |
| |
| return ((GstStructure *) p)->name == gst_tag_list_quark; |
| } |
| typedef struct |
| { |
| GstStructure *list; |
| GstTagMergeMode mode; |
| } |
| GstTagCopyData; |
| static void |
| gst_tag_list_add_value_internal (GstStructure * list, GstTagMergeMode mode, |
| GQuark tag, const GValue * value) |
| { |
| GstTagInfo *info = gst_tag_lookup (tag); |
| const GValue *value2; |
| |
| g_assert (info != NULL); |
| |
| if (info->merge_func |
| && (value2 = gst_structure_id_get_value (list, tag)) != NULL) { |
| GValue dest = { 0, }; |
| |
| switch (mode) { |
| case GST_TAG_MERGE_REPLACE_ALL: |
| case GST_TAG_MERGE_REPLACE: |
| gst_structure_id_set_value (list, tag, value); |
| break; |
| case GST_TAG_MERGE_PREPEND: |
| gst_value_list_concat (&dest, value, value2); |
| gst_structure_id_set_value (list, tag, &dest); |
| g_value_unset (&dest); |
| break; |
| case GST_TAG_MERGE_APPEND: |
| gst_value_list_concat (&dest, value2, value); |
| gst_structure_id_set_value (list, tag, &dest); |
| g_value_unset (&dest); |
| break; |
| case GST_TAG_MERGE_KEEP: |
| case GST_TAG_MERGE_KEEP_ALL: |
| break; |
| default: |
| g_assert_not_reached (); |
| break; |
| } |
| } else { |
| switch (mode) { |
| case GST_TAG_MERGE_APPEND: |
| case GST_TAG_MERGE_KEEP: |
| if (gst_structure_id_get_value (list, tag) != NULL) |
| break; |
| /* fall through */ |
| case GST_TAG_MERGE_REPLACE_ALL: |
| case GST_TAG_MERGE_REPLACE: |
| case GST_TAG_MERGE_PREPEND: |
| gst_structure_id_set_value (list, tag, value); |
| break; |
| case GST_TAG_MERGE_KEEP_ALL: |
| break; |
| default: |
| g_assert_not_reached (); |
| break; |
| } |
| } |
| } |
| static gboolean |
| gst_tag_list_copy_foreach (GQuark tag, const GValue * value, gpointer user_data) |
| { |
| GstTagCopyData *copy = (GstTagCopyData *) user_data; |
| |
| gst_tag_list_add_value_internal (copy->list, copy->mode, tag, value); |
| |
| return TRUE; |
| } |
| |
| /** |
| * gst_tag_list_insert: |
| * @into: list to merge into |
| * @from: list to merge from |
| * @mode: the mode to use |
| * |
| * Inserts the tags of the second list into the first list using the given mode. |
| */ |
| void |
| gst_tag_list_insert (GstTagList * into, const GstTagList * from, |
| GstTagMergeMode mode) |
| { |
| GstTagCopyData data; |
| |
| g_return_if_fail (GST_IS_TAG_LIST (into)); |
| g_return_if_fail (GST_IS_TAG_LIST (from)); |
| g_return_if_fail (GST_TAG_MODE_IS_VALID (mode)); |
| |
| data.list = (GstStructure *) into; |
| data.mode = mode; |
| if (mode == GST_TAG_MERGE_REPLACE_ALL) { |
| gst_structure_remove_all_fields (data.list); |
| } |
| gst_structure_foreach ((GstStructure *) from, gst_tag_list_copy_foreach, |
| &data); |
| } |
| |
| /** |
| * gst_tag_list_copy: |
| * @list: list to copy |
| * |
| * Copies a given #GstTagList. |
| * |
| * Returns: copy of the given list |
| */ |
| GstTagList * |
| gst_tag_list_copy (const GstTagList * list) |
| { |
| g_return_val_if_fail (GST_IS_TAG_LIST (list), NULL); |
| |
| return GST_TAG_LIST (gst_structure_copy ((GstStructure *) list)); |
| } |
| |
| /** |
| * gst_tag_list_merge: |
| * @list1: first list to merge |
| * @list2: second list to merge |
| * @mode: the mode to use |
| * |
| * Merges the two given lists into a new list. If one of the lists is NULL, a |
| * copy of the other is returned. If both lists are NULL, NULL is returned. |
| * |
| * Returns: the new list |
| */ |
| GstTagList * |
| gst_tag_list_merge (const GstTagList * list1, const GstTagList * list2, |
| GstTagMergeMode mode) |
| { |
| g_return_val_if_fail (list1 == NULL || GST_IS_TAG_LIST (list1), NULL); |
| g_return_val_if_fail (list2 == NULL || GST_IS_TAG_LIST (list2), NULL); |
| g_return_val_if_fail (GST_TAG_MODE_IS_VALID (mode), NULL); |
| |
| if (!list1 && !list2) { |
| return NULL; |
| } else if (!list1) { |
| return gst_tag_list_copy (list2); |
| } else if (!list2) { |
| return gst_tag_list_copy (list1); |
| } else { |
| GstTagList *ret; |
| |
| ret = gst_tag_list_copy (list1); |
| gst_tag_list_insert (ret, list2, mode); |
| return ret; |
| } |
| } |
| |
| /** |
| * gst_tag_list_free: |
| * @list: the list to free |
| * |
| * Frees the given list and all associated values. |
| */ |
| void |
| gst_tag_list_free (GstTagList * list) |
| { |
| g_return_if_fail (GST_IS_TAG_LIST (list)); |
| gst_structure_free ((GstStructure *) list); |
| } |
| |
| /** |
| * gst_tag_list_get_tag_size: |
| * @list: a taglist |
| * @tag: the tag to query |
| * |
| * Checks how many value are stored in this tag list for the given tag. |
| * |
| * Returns: The number of tags stored |
| */ |
| guint |
| gst_tag_list_get_tag_size (const GstTagList * list, const gchar * tag) |
| { |
| const GValue *value; |
| |
| g_return_val_if_fail (GST_IS_TAG_LIST (list), 0); |
| |
| value = gst_structure_get_value ((GstStructure *) list, tag); |
| if (value == NULL) |
| return 0; |
| if (G_VALUE_TYPE (value) != GST_TYPE_LIST) |
| return 1; |
| |
| return gst_value_list_get_size (value); |
| } |
| |
| /** |
| * gst_tag_list_add: |
| * @list: list to set tags in |
| * @mode: the mode to use |
| * @tag: tag |
| * @...: NULL-terminated list of values to set |
| * |
| * Sets the values for the given tags using the specified mode. |
| */ |
| void |
| gst_tag_list_add (GstTagList * list, GstTagMergeMode mode, const gchar * tag, |
| ...) |
| { |
| va_list args; |
| |
| g_return_if_fail (GST_IS_TAG_LIST (list)); |
| g_return_if_fail (GST_TAG_MODE_IS_VALID (mode)); |
| g_return_if_fail (tag != NULL); |
| |
| va_start (args, tag); |
| gst_tag_list_add_valist (list, mode, tag, args); |
| va_end (args); |
| } |
| |
| /** |
| * gst_tag_list_add_values: |
| * @list: list to set tags in |
| * @mode: the mode to use |
| * @tag: tag |
| * @...: GValues to set |
| * |
| * Sets the GValues for the given tags using the specified mode. |
| */ |
| void |
| gst_tag_list_add_values (GstTagList * list, GstTagMergeMode mode, |
| const gchar * tag, ...) |
| { |
| va_list args; |
| |
| g_return_if_fail (GST_IS_TAG_LIST (list)); |
| g_return_if_fail (GST_TAG_MODE_IS_VALID (mode)); |
| g_return_if_fail (tag != NULL); |
| |
| va_start (args, tag); |
| gst_tag_list_add_valist_values (list, mode, tag, args); |
| va_end (args); |
| } |
| |
| /** |
| * gst_tag_list_add_valist: |
| * @list: list to set tags in |
| * @mode: the mode to use |
| * @tag: tag |
| * @var_args: tag / value pairs to set |
| * |
| * Sets the values for the given tags using the specified mode. |
| */ |
| void |
| gst_tag_list_add_valist (GstTagList * list, GstTagMergeMode mode, |
| const gchar * tag, va_list var_args) |
| { |
| GstTagInfo *info; |
| GQuark quark; |
| gchar *error = NULL; |
| |
| g_return_if_fail (GST_IS_TAG_LIST (list)); |
| g_return_if_fail (GST_TAG_MODE_IS_VALID (mode)); |
| g_return_if_fail (tag != NULL); |
| |
| while (tag != NULL) { |
| GValue value = { 0, }; |
| |
| quark = g_quark_from_string (tag); |
| info = gst_tag_lookup (quark); |
| if (info == NULL) |
| g_warning ("no GstTag for %s", tag); |
| g_return_if_fail (info != NULL); |
| g_value_init (&value, info->type); |
| G_VALUE_COLLECT (&value, var_args, 0, &error); |
| if (error) { |
| g_warning ("%s: %s", G_STRLOC, error); |
| g_free (error); |
| /* we purposely leak the value here, it might not be |
| * in a sane state if an error condition occoured |
| */ |
| return; |
| } |
| gst_tag_list_add_value_internal (list, mode, quark, &value); |
| g_value_unset (&value); |
| tag = va_arg (var_args, gchar *); |
| } |
| } |
| |
| /** |
| * gst_tag_list_add_valist_values: |
| * @list: list to set tags in |
| * @mode: the mode to use |
| * @tag: tag |
| * @var_args: tag / GValue pairs to set |
| * |
| * Sets the GValues for the given tags using the specified mode. |
| */ |
| void |
| gst_tag_list_add_valist_values (GstTagList * list, GstTagMergeMode mode, |
| const gchar * tag, va_list var_args) |
| { |
| GstTagInfo *info; |
| GQuark quark; |
| |
| g_return_if_fail (GST_IS_TAG_LIST (list)); |
| g_return_if_fail (GST_TAG_MODE_IS_VALID (mode)); |
| g_return_if_fail (tag != NULL); |
| |
| while (tag != NULL) { |
| quark = g_quark_from_string (tag); |
| info = gst_tag_lookup (quark); |
| g_return_if_fail (info != NULL); |
| gst_tag_list_add_value_internal (list, mode, quark, va_arg (var_args, |
| GValue *)); |
| tag = va_arg (var_args, gchar *); |
| } |
| } |
| |
| /** |
| * gst_tag_list_remove_tag: |
| * @list: list to remove tag from |
| * @tag: tag to remove |
| * |
| * Removes the given tag from the taglist. |
| */ |
| void |
| gst_tag_list_remove_tag (GstTagList * list, const gchar * tag) |
| { |
| g_return_if_fail (GST_IS_TAG_LIST (list)); |
| g_return_if_fail (tag != NULL); |
| |
| gst_structure_remove_field ((GstStructure *) list, tag); |
| } |
| typedef struct |
| { |
| GstTagForeachFunc func; |
| const GstTagList *tag_list; |
| gpointer data; |
| } |
| TagForeachData; |
| static int |
| structure_foreach_wrapper (GQuark field_id, const GValue * value, |
| gpointer user_data) |
| { |
| TagForeachData *data = (TagForeachData *) user_data; |
| |
| data->func (data->tag_list, g_quark_to_string (field_id), data->data); |
| return TRUE; |
| } |
| |
| /** |
| * gst_tag_list_foreach: |
| * @list: list to iterate over |
| * @func: function to be called for each tag |
| * @user_data: user specified data |
| * |
| * Calls the given function for each tag inside the tag list. Note that if there |
| * is no tag, the function won't be called at all. |
| */ |
| void |
| gst_tag_list_foreach (const GstTagList * list, GstTagForeachFunc func, |
| gpointer user_data) |
| { |
| TagForeachData data; |
| |
| g_return_if_fail (GST_IS_TAG_LIST (list)); |
| g_return_if_fail (func != NULL); |
| |
| data.func = func; |
| data.tag_list = list; |
| data.data = user_data; |
| gst_structure_foreach ((GstStructure *) list, structure_foreach_wrapper, |
| &data); |
| } |
| |
| /** |
| * gst_tag_list_get_value_index: |
| * @list: a #GstTagList |
| * @tag: tag to read out |
| * @index: number of entry to read out |
| * |
| * Gets the value that is at the given index for the given tag in the given |
| * list. |
| * |
| * Returns: The GValue for the specified entry or NULL if the tag wasn't |
| * available or the tag doesn't have as many entries |
| */ |
| G_CONST_RETURN GValue * |
| gst_tag_list_get_value_index (const GstTagList * list, const gchar * tag, |
| guint index) |
| { |
| const GValue *value; |
| |
| g_return_val_if_fail (GST_IS_TAG_LIST (list), NULL); |
| g_return_val_if_fail (tag != NULL, NULL); |
| |
| value = gst_structure_get_value ((GstStructure *) list, tag); |
| if (value == NULL) |
| return NULL; |
| |
| if (GST_VALUE_HOLDS_LIST (value)) { |
| if (index >= gst_value_list_get_size (value)) |
| return NULL; |
| return gst_value_list_get_value (value, index); |
| } else { |
| if (index > 0) |
| return NULL; |
| return value; |
| } |
| } |
| |
| /** |
| * gst_tag_list_copy_value: |
| * @dest: uninitialized #GValue to copy into |
| * @list: list to get the tag from |
| * @tag: tag to read out |
| * |
| * Copies the contents for the given tag into the value, |
| * merging multiple values into one if multiple values are associated |
| * with the tag. |
| * You must g_value_unset() the value after use. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| gboolean |
| gst_tag_list_copy_value (GValue * dest, const GstTagList * list, |
| const gchar * tag) |
| { |
| const GValue *src; |
| |
| g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE); |
| g_return_val_if_fail (tag != NULL, FALSE); |
| g_return_val_if_fail (dest != NULL, FALSE); |
| g_return_val_if_fail (G_VALUE_TYPE (dest) == 0, FALSE); |
| |
| src = gst_structure_get_value ((GstStructure *) list, tag); |
| if (!src) |
| return FALSE; |
| |
| if (G_VALUE_TYPE (src) == GST_TYPE_LIST) { |
| GstTagInfo *info = gst_tag_lookup (g_quark_from_string (tag)); |
| |
| /* must be there or lists aren't allowed */ |
| g_assert (info->merge_func); |
| info->merge_func (dest, src); |
| } else { |
| g_value_init (dest, G_VALUE_TYPE (src)); |
| g_value_copy (src, dest); |
| } |
| return TRUE; |
| } |
| |
| /* FIXME 0.11: this whole merge function business is overdesigned, and the |
| * _get_foo() API is misleading as well - how many application developers will |
| * expect gst_tag_list_get_string (list, GST_TAG_ARTIST, &val) might return a |
| * string with multiple comma-separated artists? _get_foo() should just be |
| * a convenience wrapper around _get_foo_index (list, tag, 0, &val), |
| * supplemented by a special _tag_list_get_string_merged() function if needed |
| * (unless someone can actually think of real use cases where the merge |
| * function is not 'use first' for non-strings and merge for strings) */ |
| |
| /***** evil macros to get all the gst_tag_list_get_*() functions right *****/ |
| |
| #define TAG_MERGE_FUNCS(name,type) \ |
| gboolean \ |
| gst_tag_list_get_ ## name (const GstTagList *list, const gchar *tag, \ |
| type *value) \ |
| { \ |
| GValue v = { 0, }; \ |
| \ |
| g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE); \ |
| g_return_val_if_fail (tag != NULL, FALSE); \ |
| g_return_val_if_fail (value != NULL, FALSE); \ |
| \ |
| if (!gst_tag_list_copy_value (&v, list, tag)) \ |
| return FALSE; \ |
| *value = COPY_FUNC (g_value_get_ ## name (&v)); \ |
| g_value_unset (&v); \ |
| return TRUE; \ |
| } \ |
| \ |
| gboolean \ |
| gst_tag_list_get_ ## name ## _index (const GstTagList *list, \ |
| const gchar *tag, \ |
| guint index, type *value) \ |
| { \ |
| const GValue *v; \ |
| \ |
| g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE); \ |
| g_return_val_if_fail (tag != NULL, FALSE); \ |
| g_return_val_if_fail (value != NULL, FALSE); \ |
| \ |
| if ((v = gst_tag_list_get_value_index (list, tag, index)) == NULL) \ |
| return FALSE; \ |
| *value = COPY_FUNC (g_value_get_ ## name (v)); \ |
| return TRUE; \ |
| } |
| |
| /* FIXME 0.11: maybe get rid of _get_char*(), _get_uchar*(), _get_long*(), |
| * _get_ulong*() and _get_pointer*()? - they are not really useful/common |
| * enough to warrant convenience accessor functions */ |
| |
| #define COPY_FUNC /**/ |
| /** |
| * gst_tag_list_get_char: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @value: location for the result |
| * |
| * Copies the contents for the given tag into the value, merging multiple values |
| * into one if multiple values are associated with the tag. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| /** |
| * gst_tag_list_get_char_index: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @index: number of entry to read out |
| * @value: location for the result |
| * |
| * Gets the value that is at the given index for the given tag in the given |
| * list. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| TAG_MERGE_FUNCS (char, gchar) |
| /** |
| * gst_tag_list_get_uchar: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @value: location for the result |
| * |
| * Copies the contents for the given tag into the value, merging multiple values |
| * into one if multiple values are associated with the tag. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| /** |
| * gst_tag_list_get_uchar_index: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @index: number of entry to read out |
| * @value: location for the result |
| * |
| * Gets the value that is at the given index for the given tag in the given |
| * list. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| TAG_MERGE_FUNCS (uchar, guchar) |
| /** |
| * gst_tag_list_get_boolean: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @value: location for the result |
| * |
| * Copies the contents for the given tag into the value, merging multiple values |
| * into one if multiple values are associated with the tag. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| /** |
| * gst_tag_list_get_boolean_index: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @index: number of entry to read out |
| * @value: location for the result |
| * |
| * Gets the value that is at the given index for the given tag in the given |
| * list. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| TAG_MERGE_FUNCS (boolean, gboolean) |
| /** |
| * gst_tag_list_get_int: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @value: location for the result |
| * |
| * Copies the contents for the given tag into the value, merging multiple values |
| * into one if multiple values are associated with the tag. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| /** |
| * gst_tag_list_get_int_index: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @index: number of entry to read out |
| * @value: location for the result |
| * |
| * Gets the value that is at the given index for the given tag in the given |
| * list. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| TAG_MERGE_FUNCS (int, gint) |
| /** |
| * gst_tag_list_get_uint: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @value: location for the result |
| * |
| * Copies the contents for the given tag into the value, merging multiple values |
| * into one if multiple values are associated with the tag. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| /** |
| * gst_tag_list_get_uint_index: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @index: number of entry to read out |
| * @value: location for the result |
| * |
| * Gets the value that is at the given index for the given tag in the given |
| * list. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| TAG_MERGE_FUNCS (uint, guint) |
| /** |
| * gst_tag_list_get_long: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @value: location for the result |
| * |
| * Copies the contents for the given tag into the value, merging multiple values |
| * into one if multiple values are associated with the tag. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| /** |
| * gst_tag_list_get_long_index: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @index: number of entry to read out |
| * @value: location for the result |
| * |
| * Gets the value that is at the given index for the given tag in the given |
| * list. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| TAG_MERGE_FUNCS (long, glong) |
| /** |
| * gst_tag_list_get_ulong: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @value: location for the result |
| * |
| * Copies the contents for the given tag into the value, merging multiple values |
| * into one if multiple values are associated with the tag. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| /** |
| * gst_tag_list_get_ulong_index: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @index: number of entry to read out |
| * @value: location for the result |
| * |
| * Gets the value that is at the given index for the given tag in the given |
| * list. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| TAG_MERGE_FUNCS (ulong, gulong) |
| /** |
| * gst_tag_list_get_int64: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @value: location for the result |
| * |
| * Copies the contents for the given tag into the value, merging multiple values |
| * into one if multiple values are associated with the tag. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| /** |
| * gst_tag_list_get_int64_index: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @index: number of entry to read out |
| * @value: location for the result |
| * |
| * Gets the value that is at the given index for the given tag in the given |
| * list. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| TAG_MERGE_FUNCS (int64, gint64) |
| /** |
| * gst_tag_list_get_uint64: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @value: location for the result |
| * |
| * Copies the contents for the given tag into the value, merging multiple values |
| * into one if multiple values are associated with the tag. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| /** |
| * gst_tag_list_get_uint64_index: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @index: number of entry to read out |
| * @value: location for the result |
| * |
| * Gets the value that is at the given index for the given tag in the given |
| * list. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| TAG_MERGE_FUNCS (uint64, guint64) |
| /** |
| * gst_tag_list_get_float: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @value: location for the result |
| * |
| * Copies the contents for the given tag into the value, merging multiple values |
| * into one if multiple values are associated with the tag. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| /** |
| * gst_tag_list_get_float_index: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @index: number of entry to read out |
| * @value: location for the result |
| * |
| * Gets the value that is at the given index for the given tag in the given |
| * list. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| TAG_MERGE_FUNCS (float, gfloat) |
| /** |
| * gst_tag_list_get_double: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @value: location for the result |
| * |
| * Copies the contents for the given tag into the value, merging multiple values |
| * into one if multiple values are associated with the tag. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| /** |
| * gst_tag_list_get_double_index: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @index: number of entry to read out |
| * @value: location for the result |
| * |
| * Gets the value that is at the given index for the given tag in the given |
| * list. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| TAG_MERGE_FUNCS (double, gdouble) |
| /** |
| * gst_tag_list_get_pointer: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @value: location for the result |
| * |
| * Copies the contents for the given tag into the value, merging multiple values |
| * into one if multiple values are associated with the tag. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| /** |
| * gst_tag_list_get_pointer_index: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @index: number of entry to read out |
| * @value: location for the result |
| * |
| * Gets the value that is at the given index for the given tag in the given |
| * list. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| TAG_MERGE_FUNCS (pointer, gpointer) |
| #undef COPY_FUNC |
| #define COPY_FUNC g_strdup |
| /** |
| * gst_tag_list_get_string: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @value: location for the result |
| * |
| * Copies the contents for the given tag into the value, possibly merging |
| * multiple values into one if multiple values are associated with the tag. |
| * |
| * Use gst_tag_list_get_string_index (list, tag, 0, value) if you want |
| * to retrieve the first string associated with this tag unmodified. |
| * |
| * The resulting string in @value should be freed by the caller using g_free |
| * when no longer needed |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| /** |
| * gst_tag_list_get_string_index: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @index: number of entry to read out |
| * @value: location for the result |
| * |
| * Gets the value that is at the given index for the given tag in the given |
| * list. |
| * |
| * The resulting string in @value should be freed by the caller using g_free |
| * when no longer needed |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list. |
| */ |
| TAG_MERGE_FUNCS (string, gchar *) |
| |
| /** |
| * gst_tag_list_get_date: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @value: location for the result |
| * |
| * Copies the contents for the given tag into the value, merging multiple values |
| * into one if multiple values are associated with the tag. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list or if it was #NULL. |
| */ |
| gboolean |
| gst_tag_list_get_date (const GstTagList * list, const gchar * tag, |
| GDate ** value) |
| { |
| GValue v = { 0, }; |
| |
| g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE); |
| g_return_val_if_fail (tag != NULL, FALSE); |
| g_return_val_if_fail (value != NULL, FALSE); |
| |
| if (!gst_tag_list_copy_value (&v, list, tag)) |
| return FALSE; |
| *value = (GDate *) g_value_dup_boxed (&v); |
| g_value_unset (&v); |
| return (*value != NULL); |
| } |
| |
| /** |
| * gst_tag_list_get_date_index: |
| * @list: a #GstTagList to get the tag from |
| * @tag: tag to read out |
| * @index: number of entry to read out |
| * @value: location for the result |
| * |
| * Gets the value that is at the given index for the given tag in the given |
| * list. |
| * |
| * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the |
| * given list or if it was #NULL. |
| */ |
| gboolean |
| gst_tag_list_get_date_index (const GstTagList * list, |
| const gchar * tag, guint index, GDate ** value) |
| { |
| const GValue *v; |
| |
| g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE); |
| g_return_val_if_fail (tag != NULL, FALSE); |
| g_return_val_if_fail (value != NULL, FALSE); |
| |
| if ((v = gst_tag_list_get_value_index (list, tag, index)) == NULL) |
| return FALSE; |
| *value = (GDate *) g_value_dup_boxed (v); |
| return (*value != NULL); |
| } |