Metadata God

A flutter plugin for retrieving and writing audio tags/metadata from audio files. It supports almost all kind of audio files

Supported Audio Formats

File Format	Metadata Format
mp3	id3v2.4
m4a, mp4	MPEG-4 audio metadata
flac	Vorbis comment

Installation

Run in terminal:

$ flutter pub add metadata_god

Configuration

Android

For using metadata_god in Android it needs READ_EXTERNAL_STORAGE and WRITE_EXTERNAL_STORAGE permissions

So, add following green highlighted lines to android/app/src/main/AndroidManifest.xml file:

<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.example">

+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

  
  <application 
    android:label="Example"
    android:name="${applicationName}"
    android:icon="@mipmap/ic_launcher"
    android:usesCleartextTraffic="true"
+   android:requestLegacyExternalStorage="true"
  >
// .... rest of the file

Finally, use packages like permission_handler to request storage permissions from user if not granted already

// before calling any method of MetadataGod in android
// check if storage permission is granted or not
// if not, request for permission
  initState(){
    final hasStorageAccess = Platform.isAndroid ? await Permission.storage.isGranted : true
    if(!hasStorageAccess){
      await Permission.storage.request();
      if(!await Permission.storage.isGranted){
        return;
      }
    }
    // ... call all the metadata_god methods from here
  }

Following configuration would work with file path that are allowed explicitly by android. If you want entire storage access you'll need MANAGE_EXTERNAL_STORAGE permission and request the user to enable access to entire storage in app info settings.

Other platforms

Linux, Windows and MacOS doesn't need any extra configuration and good to go after installation

Usage

import 'package:flutter/material.dart';
import 'package:mime/mime.dart';
import 'package:metadata_god/metadata_god.dart';

// Initialize the plugin
void main(){
  WidgetsFlutterBinding.ensureInitialized();
  MetadataGod.initialize();
  runApp(const MyApp());
}

// Get metadata from file
Metadata metadata = await MetadataGod.getMetadata("/path/to/audio-file");

// Set metadata to file
await MetadataGod.writeMetadata(
  "/path/to/audio-file",
  Metadata(
    title: "Leave the Door Open",
    artist: "Bruno Mars, Anderson .Paak, Silk Sonic",
    album: "An Evening with Silk Sonic",
    genre: "R&B, Soul",
    year: 2021,
    albumArtist: "Bruno Mars, Anderson .Paak",
    trackNumber: 1,
    trackTotal: 12,
    discNumber: 1,
    discTotal: 5,
    durationMs: 248000,
    fileSize: file.lengthSync(),
    picture: Picture(
      data: File("/path/to/cover-image").readAsBytesSync(),
      mimeType: lookupMimeType("/path/to/cover-image"),
    ),
  ),
);

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.

License

MIT

Author

Kingkor Roy Tirtho