gsttagvorbis

gsttagvorbis — tag mappings and support functions for plugins dealing with vorbiscomments

Functions

Object Hierarchy


Includes

#include <gst/tag/tag.h>

Description

Contains various utility functions for plugins to parse or create vorbiscomments and map them to and from GstTagLists.

Functions

gst_tag_from_vorbis_tag ()

const gchar *
gst_tag_from_vorbis_tag (const gchar *vorbis_tag);

Looks up the GStreamer tag for a vorbiscomment tag.

Parameters

vorbis_tag

vorbiscomment tag to convert to GStreamer tag

 

Returns

The corresponding GStreamer tag or NULL if none exists.


gst_tag_to_vorbis_tag ()

const gchar *
gst_tag_to_vorbis_tag (const gchar *gst_tag);

Looks up the vorbiscomment tag for a GStreamer tag.

Parameters

gst_tag

GStreamer tag to convert to vorbiscomment tag

 

Returns

The corresponding vorbiscomment tag or NULL if none exists.


gst_vorbis_tag_add ()

void
gst_vorbis_tag_add (GstTagList *list,
                    const gchar *tag,
                    const gchar *value);

Convenience function using gst_tag_from_vorbis_tag(), parsing a vorbis comment string into the right type and adding it to the given taglist list .

Unknown vorbiscomment tags will be added to the tag list in form of a GST_TAG_EXTENDED_COMMENT.

Parameters

list

a GstTagList

 

tag

a vorbiscomment tag string (key in key=value), must be valid UTF-8

 

value

a vorbiscomment value string (value in key=value), must be valid UTF-8

 

gst_tag_to_vorbis_comments ()

GList *
gst_tag_to_vorbis_comments (const GstTagList *list,
                            const gchar *tag);

Creates a new tag list that contains the information parsed out of a vorbiscomment packet.

Parameters

list

a GstTagList

 

tag

a GStreamer tag identifier, such as GST_TAG_ARTIST

 

Returns

A GList of newly-allocated key=value strings. Free with g_list_foreach (list, (GFunc) g_free, NULL) plus g_list_free (list).

[element-type utf8][transfer full]


gst_tag_list_from_vorbiscomment ()

GstTagList *
gst_tag_list_from_vorbiscomment (const guint8 *data,
                                 gsize size,
                                 const guint8 *id_data,
                                 const guint id_data_length,
                                 gchar **vendor_string);

Creates a new tag list that contains the information parsed out of a vorbiscomment packet.

Parameters

data

data to convert

 

size

size of data

 

id_data

identification data at start of stream

 

id_data_length

length of identification data

 

vendor_string

pointer to a string that should take the vendor string of this vorbis comment or NULL if you don't need it.

 

Returns

A new GstTagList with all tags that could be extracted from the given vorbiscomment buffer or NULL on error.


gst_tag_list_from_vorbiscomment_buffer ()

GstTagList *
gst_tag_list_from_vorbiscomment_buffer
                               (GstBuffer *buffer,
                                const guint8 *id_data,
                                const guint id_data_length,
                                gchar **vendor_string);

Creates a new tag list that contains the information parsed out of a vorbiscomment packet.

Parameters

buffer

buffer to convert

 

id_data

identification data at start of stream

 

id_data_length

length of identification data

 

vendor_string

pointer to a string that should take the vendor string of this vorbis comment or NULL if you don't need it.

 

Returns

A new GstTagList with all tags that could be extracted from the given vorbiscomment buffer or NULL on error.


gst_tag_list_to_vorbiscomment_buffer ()

GstBuffer *
gst_tag_list_to_vorbiscomment_buffer (const GstTagList *list,
                                      const guint8 *id_data,
                                      const guint id_data_length,
                                      const gchar *vendor_string);

Creates a new vorbiscomment buffer from a tag list.

Parameters

list

tag list to convert

 

id_data

identification data at start of stream

 

id_data_length

length of identification data, may be 0 if id_data is NULL

 

vendor_string

string that describes the vendor string or NULL

 

Returns

A new GstBuffer containing a vorbiscomment buffer with all tags that could be converted from the given tag list.

Types and Values

See Also

GstTagList