MP3::Tag::ID3v2-Data(3) get_frame() data format and supported frames

SYNOPSIS


$mp3 = MP3::Tag->new($filename);
$mp3->get_tags();
$id3v2 = $mp3->{ID3v2} if exists $mp3->{id3v2};
($info, $long) = $id3v2->get_frame($id); # or
($info, $long) = $id3v2->get_frame($id, 'raw');

DESCRIPTION

This document describes how to use the results of the get_frame function of MP3::Tag::ID3v2, thus the data format of frames retrieved with MP3::Tag::ID3v2::get_frame().

It contains also a list of all supported ID3v2-Frames.

get_frame()

 ($info, $long) = $id3v2->get_frame($id);    # or
 
 ($info, $long) = $id3v2->get_frame($id, 'raw');

$id has to be a name of a frame like ``APIC''. For more variants of calling see get_frame().

The names of all frames found in a tag can be retrieved with the get_frame_ids() function.

Using the returned data

In the ID3v2.3 specifications 73 frames are defined, which can contain very different information. That means that get_frame returns the information of different frames also in different ways.
Simple Frames
A lot of the tags contain only a text string and encoding information. If you call ($info, $long) = $id3v2->get_frame($id) for such a frame, $info will contain the text string and $long will contain the english name of the frame.

Example:
  get_frame(``TIT2'');     # returns 

  ("Birdhouse In Your Soul", "Title/songname/content description")
Complex Frames
For more complex frames the returned $info is a reference to a hash, where each entry of the hash decribes a part of the information found in the frame. The key of a hash entry contains the name of this part, the according value contains the information itself.

Example:
  get_frame(``APIC'');     # returns 

  ( { "Description" => "Flood", 
      "MIME Type" => "/image/jpeg", 
      "Picture Type" => "Cover (front)",
      "_Data" => "..data of jpeg picture (binary).."
     },
   "Attached Picture");
Other Frames
Some frames are not supported at the moment, ie the data found in the frame is not returned in a descriptive way. But you can read the data of this frames (and also of all other frames too) in raw mode. Then the complete data field of the frame is returned, without any modifications. This means that the returned data will be almost binary data.

Example:
  get_frame(``TIT2'', 'raw');    # returns 

  ("\x00Birdhouse In Your Soul", "Title/songname/content description")

The frames which (in addition to "Text"/"URL") contain only "Description" and "Language" fields are in some intermediate position between ``simple'' and ``complex'' frames. They can be handled very similarly to ``simple'' frames by using ``long names'', such as "COMM[description]" or "COMM(LANG)[description]", and the corresponding ``quick'' API such as frame_select().

List of Simple Frames

Following Frames are supported and return a single string (text). In the List you can find the frame IDs and the long names of the frames as returned by $id3v2->get_frame():
IPLS : Involved people list
MCDI : Music CD identifier
PCNT : Play counter
TALB : Album/Movie/Show title
TBPM : BPM (beats per minute)
TCOM : Composer
TCON : Content type
TCOP : Copyright message
TDAT : Date
TDLY : Playlist delay
TDRC : Recording time
TENC : Encoded by
TEXT : Lyricist/Text writer
TFLT : File type
TIME : Time
TIPL : Involved people list
TIT1 : Content group description
TIT2 : Title/songname/content description
TIT3 : Subtitle/Description refinement
TKEY : Initial key
TLAN : Language(s)
TLEN : Length
TMCL : Musician credits list
TMED : Media type
TOAL : Original album/movie/show title
TOFN : Original filename
TOLY : Original lyricist(s)/text writer(s)
TOPE : Original artist(s)/performer(s)
TORY : Original release year
TOWN : File owner/licensee
TPE1 : Lead performer(s)/Soloist(s)
TPE2 : Band/orchestra/accompaniment
TPE3 : Conductor/performer refinement
TPE4 : Interpreted, remixed, or otherwise modified by
TPOS : Part of a set
TPUB : Publisher
TRCK : Track number/Position in set
TRDA : Recording dates
TRSN : Internet radio station name
TRSO : Internet radio station owner
TSIZ : Size
TSRC : ISRC (international standard recording code)
TSSE : Software/Hardware and settings used for encoding
TYER : Year
WCOM : Commercial information
WCOP : Copyright/Legal information
WOAF : Official audio file webpage
WOAR : Official artist/performer webpage
WOAS : Official audio source webpage
WORS : Official internet radio station homepage
WPAY : Payment
WPUB : Publishers official webpage

List of Complex Frames

Following frames are supported and return a reference to a hash. The list shows which keys can be found in the returned hash:
AENC : Audio encryption
  Keys: URL, Preview start, Preview length, _Data
APIC : Attached picture
  Keys: MIME type, Picture Type, Description, _Data
COMM : Comments
  Keys: Language, Description, Text
COMR : Commercial frame
  Keys: Price, Valid until, URL, Received as, Name of Seller, Description, MIME type, _Logo
ENCR : Encryption method registration
  Keys: Owner ID, Method symbol, _Data
GEOB : General encapsulated object
  Keys: MIME type, Filename, Description, _Data
GRID : Group identification registration
  Keys: Owner, Symbol, _Data
LINK : Linked information
  Keys: ID, URL, Text
OWNE : Ownership frame
  Keys: Price payed, Date of purchase, Text
POPM : Popularimeter
  Keys: URL, Rating, Counter
PRIV : Private frame
  Keys: Text, _Data
RBUF : Recommended buffer size
  Keys: Buffer size, Embedded info flag, Offset to next tag
RVRB : Reverb
  Keys: Reverb left (ms), Reverb right (ms), Reverb bounces (left), Reverb bounces (right), Reverb feedback (left to left), Reverb feedback (left to right), Reverb feedback (right to right), Reverb feedback (right to left), Premix left to right, Premix right to left
SYTC : Synchronized tempo codes
  Keys: Time Stamp Format, _Data
TXXX : User defined text information frame
  Keys: Description, Text
UFID : Unique file identifier
  Keys: Text, _Data
USER : Terms of use
  Keys: Language, Text
USLT : Unsychronized lyric/text transcription
  Keys: Language, Description, Text
WXXX : User defined URL link frame
  Keys: Description, URL

List of Other Frames

Following frames are only supported in raw mode:
CRM : Encrypted meta frame
EQUA : Equalization
ETCO : Event timing codes
LNK : Linked information
MLLT : MPEG location lookup table
PIC : Attached picture
POSS : Position synchronisation frame
RVAD : Relative volume adjustment
SYLT : Synchronized lyric/text

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