FlutterMidi16kb

A lightweight Flutter plugin that provides MIDI playback using the TinySoundFont synthesizer. Ideal for piano apps, educational apps, and other music-related projects where you need custom SF2 soundfonts.

Features

• Load and play custom SF2 soundfonts
• Play MIDI notes with velocity
• Stop notes programmatically
• Works entirely offline
• Small and efficient

Getting Started

Installation

Add this to your pubspec.yaml:

dependencies:
  flutter_midi_16kb: ^0.0.3

Usage

import 'package:flutter/services.dart' show rootBundle;
import 'package:path_provider/path_provider.dart';
import 'dart:io';
import 'package:flutter_midi_16kb/flutter_midi_16kb.dart';

Future<void> loadSf2() async {
  // Load SF2 asset and copy to temp file
  final data = await rootBundle.load("assets/soundfonts/Piano.sf2");
  final dir = await getTemporaryDirectory();
  final file = File("${dir.path}/Piano.sf2");
  await file.writeAsBytes(data.buffer.asUint8List());

  // Load soundfont into the plugin
  await FlutterMidi16kb.loadSoundfont(file.path);
}

// Play a note
FlutterMidi16kb.playNote(60); // Middle C

// Stop a note
FlutterMidi16kb.stopNote(60);

Asset Setup

Place your .sf2 files in assets/sf2/ and declare them in pubspec.yaml:

flutter:
  assets:
    - assets/sf2/Piano.sf2

Example

Check the example directory for a working demo app.

Roadmap

• iOS implementation
• Advanced MIDI file playback
• Load soundfont from App Storage

Contributing

Pull requests are welcome! Please open an issue first to discuss what you’d like to change.

License

MIT License. See LICENSE for details.