Crate lofty

Expand description

Parse, convert, and write metadata to audio formats.

Supported Formats

File Format	Metadata Format(s)
AAC (ADTS)	`ID3v2`, `ID3v1`
Ape	`APEv2`, `APEv1`, `ID3v2`*, `ID3v1`
AIFF	`ID3v2`, `Text Chunks`
FLAC	`Vorbis Comments`, `ID3v2`*
MP3	`ID3v2`, `ID3v1`, `APEv2`, `APEv1`
MP4	`iTunes-style ilst`
Opus	`Vorbis Comments`
Ogg Vorbis	`Vorbis Comments`
Speex	`Vorbis Comments`
WAV	`ID3v2`, `RIFF INFO`
WavPack	`APEv2`, `APEv1`, `ID3v1`

* The tag will be read only, due to lack of official support

Examples

Reading a generic file

It isn’t always convenient to use concrete file types, which is where TaggedFile comes in.

Using a path

use lofty::{read_from_path, Probe};

// This will guess the format from the extension
// ("mp3" in this case), but we can guess from the content if we want to.
let path = "test.mp3";
let tagged_file = read_from_path(path)?;

// Let's guess the format from the content just in case.
// This is not necessary in this case!
let tagged_file2 = Probe::open(path)?.guess_file_type()?.read()?;

Using an existing reader

use lofty::{read_from, ParseOptions};
use std::fs::File;

// Let's read from an open file
let path = "test.mp3";
let mut file = File::open(path)?;

// Here, we have to guess the file type prior to reading
let tagged_file = read_from(&mut file)?;

Accessing tags

use lofty::{read_from_path, ParseOptions, TaggedFileExt};

let path = "test.mp3";
let tagged_file = read_from_path(path)?;

// Get the primary tag (ID3v2 in this case)
let id3v2 = tagged_file.primary_tag();

// If the primary tag doesn't exist, or the tag types
// don't matter, the first tag can be retrieved
let unknown_first_tag = tagged_file.first_tag();

Using concrete file types

use lofty::mpeg::MPEGFile;
use lofty::{AudioFile, ParseOptions, TagType};
use std::fs::File;

let mut file_content = File::open(path)?;

// We are expecting an MP3 file
let mp3_file = MPEGFile::read_from(&mut file_content, ParseOptions::new())?;

assert_eq!(mp3_file.properties().channels(), 2);

// Here we have a file with multiple tags
assert!(mp3_file.contains_tag_type(TagType::ID3v2));
assert!(mp3_file.contains_tag_type(TagType::APE));

Important format-specific notes

All formats have their own quirks that may produce unexpected results between conversions. Be sure to read the module documentation of each format to see important notes and warnings.