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Description:

audio metadata reader

A pure-Dart package for reading and writing metadata for different audio format

File Format
Metadata Format(s)
Read
Write

MP3
ID3v2 ID3v3 ID3v4
✅
❌

MP4
iTunes-style ilst
✅
❌

FLAC
Vorbis Comments
✅
❌

OGG
Vorbis Comments
✅
❌

Opus
Vorbis Comments
✅
❌

It's still in development and there's some metadat format that I could implement or some information the library could return. Just open an issue for that.
Usage #
import 'dart:io';

import 'package:audio_metadata_reader/audio_metadata_reader.dart';

Future<void> main() async {
final track = File("Pieces.mp3");

// Getting the image of a track can be heavy and slow the reading
final metadata = await readMetadata(track, getImage: false);

print(metadata.title);
print(metadata.album);

final newMetadata = AudioMetadata(
title: "Pieces",
album: "Chuck",
artist: "Sum 41",
discNumber: 1,
duration: Duration(minutes: 3, seconds: 23),
language: "English",
lyrics: "My super lyrics",
totalDisc: 1,
trackNumber: 11,
trackTotal: 13,
year: DateTime(2004),
);

newMetadata.pictures.add(
Picture(
File("newCover.jpg").readAsBytesSync(),
"image/jpg",
PictureType.coverFront,
),
);

newMetadata.genres.addAll(["Rock", "Punk"]);

await writeMetadata(track, newMetadata);
}
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Performance #
By running the following code on my laptop with a SSD, it ables to get the metadata of 2100 tracks in less than 1 second (if we don't fetch the covers). With the covers, it slightly more.
import 'dart:io';

import 'package:audio_metadata_reader/audio_metadata_reader.dart';

Future<void> main() async {
final folder = Directory(r"music folder")
.listSync(recursive: true)
.whereType<File>()
.where((element) =>
element.path.contains("mp4") ||
element.path.contains("m4a") ||
element.path.contains("mp3") ||
element.path.contains("flac"))
.toList();

print("Number of tracks: ${folder.length}");

final init = DateTime.now();
await Future.wait(folder.map((e) => readMetadata(e, getImage: false)));
final end = DateTime.now();

print(end.difference(init));
}
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Number of tracks: 2094
0:00:00.969653
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