id3

README

id3

ID3 library for Go.

Supported formats:

• ID3v1
• ID3v2.2
• ID3v2.3

Install

The platform ($GOROOT/bin) "go get" tool is the best method to install.

go get github.com/casept/id3-go

This downloads and installs the package into your $GOPATH. If you only want to recompile, use "go install".

go install github.com/casept/id3-go

Usage

An import allows access to the package.

import (
    id3 "github.com/casept/id3-go"
)

Version specific details can be accessed through the subpackages.

import (
    "github.com/casept/id3-go/v1"
    "github.com/casept/id3-go/v2"
)

Quick Start

To access the tag of a file, first open the file using the package's Open function.

mp3File, err := id3.Open("All-In.mp3")

It's also a good idea to ensure that the file is closed using defer.

defer mp3File.Close()

Accessing Information

Some commonly used data have methods in the tag for easier access. These methods are for Title, Artist, Album, Year, Genre, and Comments.

mp3File.SetArtist("Okasian")
fmt.Println(mp3File.Artist())

ID3v2 Frames

v2 Frames can be accessed directly by using the Frame or Frames method of the file, which return the first frame or a slice of frames as Framer interfaces. These interfaces allow read access to general details of the file.

lyricsFrame := mp3File.Frame("USLT")
lyrics := lyricsFrame.String()

If more specific information is needed, or frame-specific write access is needed, then the interface must be cast into the appropriate underlying type. The example provided does not check for errors, but it is recommended to do so.

lyricsFrame := mp3File.Frame("USLT").(*v2.UnsynchTextFrame)

Adding Frames

For common fields, a frame will automatically be created with the Set method. For other frames or more fine-grained control, frames can be created with the corresponding constructor, usually prefixed by New. These constructors require the first argument to be a FrameType struct, which are global variables named by version.

ft := V23FrameTypeMap["TIT2"]
text := "Hello"
textFrame := NewTextFrame(ft, text)
mp3File.AddFrames(textFrame)

Documentation

Overview

Copyright 2013 Michael Yang. All rights reserved. Use of this source code is governed by a MIT-style license that can be found in the LICENSE file.

Copyright 2013 Michael Yang. All rights reserved. Use of this source code is governed by a MIT-style license that can be found in the LICENSE file.

Index

• Constants
• type File
  • func Open(name string) (*File, error)
  • func (f *File) Close() error
• type Tagger

Constants

const (
	LatestVersion = 3
)

Types

type File

type File struct {
	Tagger
	// contains filtered or unexported fields
}

File represents the tagged file

func Open

func Open(name string) (*File, error)

Opens a new tagged file

func (*File) Close

func (f *File) Close() error

Saves any edits to the tagged file

type Tagger

type Tagger interface {
	Title() string
	Artist() string
	Album() string
	Year() string
	Genre() string
	Comments() []string
	SetTitle(string)
	SetArtist(string)
	SetAlbum(string)
	SetYear(string)
	SetGenre(string)
	AllFrames() []v2.Framer
	Frames(string) []v2.Framer
	Frame(string) v2.Framer
	DeleteFrames(string) []v2.Framer
	AddFrames(...v2.Framer)
	Bytes() []byte
	Dirty() bool
	Padding() uint
	Size() int
	Version() string
}

Tagger represents the metadata of a tag