TagLib::Ogg::XiphComment Class Reference

Ogg Vorbis comment implementation. More...

#include <xiphcomment.h>

Inheritance diagram for TagLib::Ogg::XiphComment:

Collaboration diagram for TagLib::Ogg::XiphComment:

Public Member Functions
	XiphComment ()
	XiphComment (const ByteVector &data)
	~XiphComment () override
	XiphComment (const XiphComment &)=delete
XiphComment &	operator= (const XiphComment &)=delete
String	title () const override
String	artist () const override
String	album () const override
String	comment () const override
String	genre () const override
unsigned int	year () const override
unsigned int	track () const override
void	setTitle (const String &s) override
void	setArtist (const String &s) override
void	setAlbum (const String &s) override
void	setComment (const String &s) override
void	setGenre (const String &s) override
void	setYear (unsigned int i) override
void	setTrack (unsigned int i) override
bool	isEmpty () const override
unsigned int	fieldCount () const
const FieldListMap &	fieldListMap () const
PropertyMap	properties () const override
PropertyMap	setProperties (const PropertyMap &) override
StringList	complexPropertyKeys () const override
List< VariantMap >	complexProperties (const String &key) const override
bool	setComplexProperties (const String &key, const List< VariantMap > &value) override
String	vendorID () const
void	addField (const String &key, const String &value, bool replace=true)
void	removeFields (const String &key)
void	removeFields (const String &key, const String &value)
void	removeAllFields ()
bool	contains (const String &key) const
ByteVector	render (bool addFramingBit=true) const
List< FLAC::Picture * >	pictureList ()
void	removePicture (FLAC::Picture *picture, bool del=true)
void	removeAllPictures ()
void	addPicture (FLAC::Picture *picture)
Public Member Functions inherited from TagLib::Tag
virtual	~Tag ()
	Tag (const Tag &)=delete
Tag &	operator= (const Tag &)=delete
virtual void	removeUnsupportedProperties (const StringList &properties)

Static Public Member Functions
static bool	checkKey (const String &)
Static Public Member Functions inherited from TagLib::Tag
static void	duplicate (const Tag *source, Tag *target, bool overwrite=true)
static String	joinTagValues (const StringList &values)

Protected Member Functions
void	parse (const ByteVector &data)
Protected Member Functions inherited from TagLib::Tag
	Tag ()

Detailed Description

Ogg Vorbis comment implementation.

This class is an implementation of the Ogg Vorbis comment specification, to be found in section 5 of the Ogg Vorbis specification. Because this format is also used in other (currently unsupported) Xiph.org formats, it has been made part of a generic implementation rather than being limited to strictly Vorbis.

Vorbis comments are a simple vector of keys and values, called fields. Multiple values for a given key are supported.

See also

fieldListMap()

Constructor & Destructor Documentation

XiphComment() [1/3]

TagLib::Ogg::XiphComment::XiphComment

(

)

Constructs an empty Vorbis comment.

XiphComment() [2/3]

TagLib::Ogg::XiphComment::XiphComment

(

const ByteVector &

data

)

Constructs a Vorbis comment from data.

~XiphComment()

TagLib::Ogg::XiphComment::~XiphComment ( )

override

Destroys this instance of the XiphComment.

XiphComment() [3/3]

TagLib::Ogg::XiphComment::XiphComment ( const XiphComment &  )

delete

Member Function Documentation

addField()

void TagLib::Ogg::XiphComment::addField	(	const String &	key,
		const String &	value,
		bool	replace = true
	)

Add the field specified by key with the data value. If replace is true, then all of the other fields with the same key will be removed first.

If the field value is empty, the field will be removed.

addPicture()

void TagLib::Ogg::XiphComment::addPicture

(

FLAC::Picture *

picture

)

Add a new picture to the comment block. The comment block takes ownership of the picture and will handle freeing its memory.

Note

The file will be saved only after calling save().

album()

String TagLib::Ogg::XiphComment::album ( ) const

overridevirtual

Returns the album name; if no album name is present in the tag an empty string will be returned.

Implements TagLib::Tag.

artist()

String TagLib::Ogg::XiphComment::artist ( ) const

overridevirtual

Returns the artist name; if no artist name is present in the tag an empty string will be returned.

Implements TagLib::Tag.

checkKey()

static bool TagLib::Ogg::XiphComment::checkKey ( const String &  )

static

Check if the given String is a valid Xiph comment key.

comment()

String TagLib::Ogg::XiphComment::comment ( ) const

overridevirtual

Returns the track comment; if no comment is present in the tag an empty string will be returned.

Implements TagLib::Tag.

complexProperties()

List< VariantMap > TagLib::Ogg::XiphComment::complexProperties ( const String &  key ) const

overridevirtual

Get the complex properties for a given key. In order to be flexible for different metadata formats, the properties are represented as variant maps. Despite this dynamic nature, some degree of standardization should be achieved between formats:

• PICTURE
  • data: ByteVector with picture data
  • description: String with description
  • pictureType: String with type as specified for ID3v2, e.g. "Front Cover", "Back Cover", "Band"
  • mimeType: String with image format, e.g. "image/jpeg"
  • optionally more information found in the tag, such as "width", "height", "numColors", "colorDepth" int values in FLAC pictures
• GENERALOBJECT
  • data: ByteVector with object data
  • description: String with description
  • fileName: String with file name
  • mimeType: String with MIME type
  • this is currently only implemented for ID3v2 GEOB frames

Reimplemented from TagLib::Tag.

complexPropertyKeys()

StringList TagLib::Ogg::XiphComment::complexPropertyKeys ( ) const

overridevirtual

Get the keys of complex properties, i.e. properties which cannot be represented simply by a string. Because such properties might be expensive to fetch, there are separate operations to get the available keys - which is expected to be cheap - and getting and setting the property values. The default implementation returns only an empty list. Reimplementations should provide "PICTURE" if embedded cover art is present, and optionally support other properties.

Reimplemented from TagLib::Tag.

contains()

bool TagLib::Ogg::XiphComment::contains

(

const String &

key

)

const

Returns true if the field is contained within the comment.

Note

This is safer than checking for membership in the FieldListMap.

fieldCount()

unsigned int TagLib::Ogg::XiphComment::fieldCount

(

)

const

Returns the number of fields present in the comment.

fieldListMap()

const FieldListMap & TagLib::Ogg::XiphComment::fieldListMap

(

)

const

Returns a reference to the map of field lists. Because Xiph comments support multiple fields with the same key, a pure Map would not work. As such this is a Map of string lists, keyed on the comment field name.

The standard set of Xiph/Vorbis fields (which may or may not be contained in any specific comment) is:

• TITLE
• VERSION
• ALBUM
• ARTIST
• PERFORMER
• COPYRIGHT
• ORGANIZATION
• DESCRIPTION
• GENRE
• DATE
• LOCATION
• CONTACT
• ISRC

For a more detailed description of these fields, please see the Ogg Vorbis specification, section 5.2.2.1.

Note

The Ogg Vorbis comment specification does allow these key values to be either upper or lower case. However, it is conventional for them to be upper case. As such, TagLib, when parsing a Xiph/Vorbis comment, converts all fields to uppercase. When you are using this data structure, you will need to specify the field name in upper case.

Warning

You should not modify this data structure directly, instead use addField() and removeField().

genre()

String TagLib::Ogg::XiphComment::genre ( ) const

overridevirtual

Returns the genre name; if no genre is present in the tag an empty string will be returned.

Implements TagLib::Tag.

isEmpty()

bool TagLib::Ogg::XiphComment::isEmpty ( ) const

overridevirtual

Returns true if the tag does not contain any data. This should be reimplemented in subclasses that provide more than the basic tagging abilities in this class.

Reimplemented from TagLib::Tag.

operator=()

XiphComment & TagLib::Ogg::XiphComment::operator= ( const XiphComment &  )

delete

parse()

void TagLib::Ogg::XiphComment::parse ( const ByteVector &  data )

protected

Reads the tag from the file specified in the constructor and fills the FieldListMap.

pictureList()

List< FLAC::Picture * > TagLib::Ogg::XiphComment::pictureList

(

)

Returns a list of pictures attached to the xiph comment.

properties()

PropertyMap TagLib::Ogg::XiphComment::properties ( ) const

overridevirtual

Implements the unified property interface – export function. The result is a one-to-one match of the Xiph comment, since it is completely compatible with the property interface (in fact, a Xiph comment is nothing more than a map from tag names to list of values, as is the dict interface).

Reimplemented from TagLib::Tag.

removeAllFields()

void TagLib::Ogg::XiphComment::removeAllFields

(

)

Remove all the fields in the comment.

See also

removeFields()

removeAllPictures()

void TagLib::Ogg::XiphComment::removeAllPictures

(

)

Remove all pictures.

removeFields() [1/2]

void TagLib::Ogg::XiphComment::removeFields

(

const String &

key

)

Remove all the fields specified by key.

See also

removeAllFields()

removeFields() [2/2]

void TagLib::Ogg::XiphComment::removeFields	(	const String &	key,
		const String &	value
	)

Remove all the fields specified by key with the data value.

See also

removeAllFields()

removePicture()

void TagLib::Ogg::XiphComment::removePicture	(	FLAC::Picture *	picture,
		bool	del = true
	)

Removes a picture. If del is true the picture's memory will be freed; if it is false, it must be deleted by the user.

render()

ByteVector TagLib::Ogg::XiphComment::render

(

bool

addFramingBit = true

)

const

Renders the comment to a ByteVector suitable for inserting into a file.

If addFramingBit is true the standard Vorbis comment framing bit will be appended. However some formats (notably FLAC) do not work with this in place.

setAlbum()

void TagLib::Ogg::XiphComment::setAlbum ( const String &  s )

overridevirtual

Sets the album to s. If s is an empty string then this value will be cleared.

Implements TagLib::Tag.

setArtist()

void TagLib::Ogg::XiphComment::setArtist ( const String &  s )

overridevirtual

Sets the artist to s. If s is an empty string then this value will be cleared.

Implements TagLib::Tag.

setComment()

void TagLib::Ogg::XiphComment::setComment ( const String &  s )

overridevirtual

Sets the comment to s. If s is an empty string then this value will be cleared.

Implements TagLib::Tag.

setComplexProperties()

bool TagLib::Ogg::XiphComment::setComplexProperties ( const String &  key, const List< VariantMap > &  value  )

overridevirtual

Set all complex properties for a given key using variant maps as value with the same format as returned by complexProperties(). An empty list as value removes all complex properties for key.

Reimplemented from TagLib::Tag.

setGenre()

void TagLib::Ogg::XiphComment::setGenre ( const String &  s )

overridevirtual

Sets the genre to s. If s is an empty string then this value will be cleared. For tag formats that use a fixed set of genres, the appropriate value will be selected based on a string comparison. A list of available genres for those formats should be available in that type's implementation.

Implements TagLib::Tag.

setProperties()

PropertyMap TagLib::Ogg::XiphComment::setProperties ( const PropertyMap &  )

overridevirtual

Implements the unified property interface – import function. The tags from the given map will be stored one-to-one in the file, except for invalid keys (less than one character, non-ASCII, or containing '=' or '~') in which case the according values will be contained in the returned PropertyMap.

Reimplemented from TagLib::Tag.

setTitle()

void TagLib::Ogg::XiphComment::setTitle ( const String &  s )

overridevirtual

Sets the title to s. If s is an empty string then this value will be cleared.

Implements TagLib::Tag.

setTrack()

void TagLib::Ogg::XiphComment::setTrack ( unsigned int  i )

overridevirtual

Sets the track to i. If s is 0 then this value will be cleared.

Implements TagLib::Tag.

setYear()

void TagLib::Ogg::XiphComment::setYear ( unsigned int  i )

overridevirtual

Sets the year to i. If s is 0 then this value will be cleared.

Implements TagLib::Tag.

title()

String TagLib::Ogg::XiphComment::title ( ) const

overridevirtual

Returns the track name; if no track name is present in the tag an empty string will be returned.

Implements TagLib::Tag.

track()

unsigned int TagLib::Ogg::XiphComment::track ( ) const

overridevirtual

Returns the track number; if there is no track number set, this will return 0.

Implements TagLib::Tag.

vendorID()

String TagLib::Ogg::XiphComment::vendorID

(

)

const

Returns the vendor ID of the Ogg Vorbis encoder. libvorbis 1.0 as the most common case always returns "Xiph.Org libVorbis I 20020717".

year()

unsigned int TagLib::Ogg::XiphComment::year ( ) const

overridevirtual

Returns the year; if there is no year set, this will return 0.

Implements TagLib::Tag.

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The documentation for this class was generated from the following file:

• xiphcomment.h