Sustainability of Digital Formats: Planning for Library of Congress Collections |
|
![]() |
|
Introduction | Sustainability Factors | Content Categories | Format Descriptions | Contact |
Full name | ID3 Metadata for MP3, Version 1 |
---|---|
Description | Structured data chunk containing descriptive metadata about the file to which it is post-pended, virtually always an MP3_FF (MP3 sound file). Referred to by its creators as an "informal standard," ID3v1 permits the identification of title, artist, date, genre, etc. See Notes for more information. |
Production phase | Generally used for final-state, end-user delivery. |
Relationship to other formats | |
Subtype of | ID3, ID3 Metadata for MP3 |
Used by | MP3_FF, MP3 file format |
LC experience or existing holdings | See ID3 |
---|---|
LC preference | See ID3 |
Disclosure | Version 1 partially documented. Developed by Martin Nilsson and colleagues, whose ID3.org web site is now strongly oriented to ID3v2, version 2. |
---|---|
Documentation | Documentation for version 1 available at ID3.org and Doug's AppleScripts for iTunes. |
Adoption | Very widely adopted for World Wide Web dissemination and playback on specialized devices. |
Licensing and patents | None |
Transparency | See ID3 |
Self-documentation | See ID3 |
External dependencies | None |
Technical protection considerations | None |
Sound | |
---|---|
Normal rendering | Not applicable |
Fidelity (high audio resolution) | Not applicable |
Multiple channels | Not applicable |
Support for user-defined sounds, samples, and patches | Not applicable |
Functionality beyond normal rendering | None |
Tag | Value | Note |
---|---|---|
Filename extension | Not applicable. | |
Internet Media Type | Not applicable. | |
Magic numbers | See note. | See 3DI marker information in Notes below. |
General |
ID3v1 binary content is structured as "frames" just like MP3_ENC (MP3 audio encoding). Version 1 is limited to 125 bytes of data; four tags are limited to 30 bytes, one to 4 bytes, and the genre tag to a one-byte code. When ID3 metadata is placed in a MP3_FF file, established conventions call for the use of the ID3 marker which consists of the string "3DI". For ID3v1, the marker is positioned 10 bytes preceding the metadata. For ID3v2 data, the marker is positioned in the first 3 bytes of the file when the metadata is pre-pended and 10 bytes from the end of a file when it is post-pended. |
---|---|
History |
|