This package provides MP3 (ID3v1,2.{2,3,4}) and MP4 (ACC, M4A, ALAC), OGG and FLAC metadata detection, parsing and artwork extraction.
Detect and parse tag metadata from an io.ReadSeeker (i.e. an *os.File):
m, err := tag.ReadFrom(f)
if err != nil {
log.Fatal(err)
}
log.Print(m.Format()) // The detected format.
log.Print(m.Title()) // The title of the track (see Metadata interface for more details).
Parsed metadata is exported via a single interface (giving a consistent API for all supported metadata formats).
// Metadata is an interface which is used to describe metadata retrieved by this package.
type Metadata interface {
Format() Format
FileType() FileType
Title() string
Album() string
Artist() string
AlbumArtist() string
Composer() string
Genre() string
Year() int
Track() (int, int) // Number, Total
Disc() (int, int) // Number, Total
Picture() *Picture // Artwork
Lyrics() string
Raw() map[string]interface{} // NB: raw tag names are not consistent across formats.
}
This package also provides a metadata-invariant checksum for audio files: only the audio data is used to construct the checksum.
http://godoc.org/github.com/dhowden/tag#Sum
There are simple command-line tools which demonstrate basic tag extraction and summing:
$ go get github.com/dhowden/tag/...
$ cd $GOPATH/bin
$ ./tag 11\ High\ Hopes.m4a
Metadata Format: MP4
Title: High Hopes
Album: The Division Bell
Artist: Pink Floyd
Composer: Abbey Road Recording Studios/David Gilmour/Polly Samson
Year: 1994
Track: 11 of 11
Disc: 1 of 1
Picture: Picture{Ext: jpeg, MIMEType: image/jpeg, Type: , Description: , Data.Size: 606109}
$ ./sum 11\ High\ Hopes.m4a
2ae208c5f00a1f21f5fac9b7f6e0b8e52c06da29