mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-09-09 05:38:58 +00:00
Original commit message from CVS: * docs/gst/gstreamer-sections.txt: * gst/gsttaglist.h: * gst/gsttaglist.c: (_gst_tag_initialize), (gst_tag_list_get_date), (gst_tag_list_get_date_index): Added gst_tag_list_get_date() and gst_tag_list_get_date_index(). GST_TAG_DATE now has a tag type of GST_TYPE_DATE (#170777).
1331 lines
38 KiB
C
1331 lines
38 KiB
C
/* 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
|
|
*
|
|
*/
|
|
|
|
#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 <gobject/gvaluecollector.h>
|
|
#include <string.h>
|
|
|
|
#define GST_TAG_IS_VALID(tag) (gst_tag_get_info (tag) != NULL)
|
|
|
|
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;
|
|
|
|
if (_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_strings_with_comma);
|
|
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_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
|
|
*
|
|
* 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.
|
|
* This function takes ownership of all supplied variables.
|
|
*/
|
|
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 goven 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;
|
|
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 (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;
|
|
}
|
|
|
|
/***** 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; \
|
|
}
|
|
|
|
#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, 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_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.
|
|
*
|
|
* 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);
|
|
}
|