flutter_soloud

A low-level audio plugin for Flutter.

	Linux	Windows	Android	MacOS	iOS	Web
Support	💙	💙	💙	💙	💙	💙
Minimum Version	Any	Any	21+	10.15+	13.0+	iOS 16.4+ Safari 16.4+ Chrome 91+ Edge 91+ Firefox 89+

Overview

A high-performance audio plugin designed primarily for games and immersive applications, providing low latency and advanced features.

Key Features

• ⚡ Low latency, high performance audio
• ⏱️ Sample-accurate scheduled playback: playClocked for sub-millisecond spaced playback regardless of buffer size, and playScheduled for score/manifest-style scheduling of whole batches of sounds on the engine's own clock (with optional scheduled stop/fade). Perfect for metronomes, music sequencers, rhythm games and precisely timed audio cues
• 🎮 3D positional audio with Doppler effect
• 🔄 Gapless looping with half-open [start, end) loop regions
• 🔄 Stream audio with auto-pause for buffering, support for PCM, MP3, WAV, Ogg with Opus, Vorbis and FLAC containers
• 📥 Pull-buffer streaming: the engine requests encoded data on demand (MP3, WAV, FLAC, Ogg Opus/Vorbis/FLAC), with seek support and callbacks for buffering, metadata, duration and data requests — ideal for network streams and custom data sources
• 🚌 Mixing buses: group voices (music, SFX, UI...) into sub-mixes with their own volume, filters and visualization
• 📊 Get audio wave and/or FFT audio data in real-time (useful for visualization)
• 🎛️ Rich effects system (reverb, echo, limiter, parametric equalizer, pitch shift, etc.)
• ⚙️ Faders for attributes (e.g. fade out for 2 seconds, then stop)
• 🎚️ Oscillators for attributes
• 🌊 Waveform generation and visualization
• 🔊 Multiple voices, playing different or even the same sound multiple times
• 🎵 Support for MP3, WAV, OGG, and FLAC
• 🔴 Capture the master mixer output as a stream for recording, processing, or streaming (with different PCM formats and Opus, Vorbis, FLAC, WAV encoded stream formats)
• ⏱️ Read audio data samples from a file with a given time range
• 🌊 Generate waveforms in real-time with various types (sine, square, saw, triangle, etc.)

Getting Started

• Watch Flutter Package of the Week video.
• Especially for web use, please look at the setup guide docs.

If you are looking for a package to visualize audio using shaders or CustomPainter, please check out audio_flux. It uses this plugin for output and flutter_recorder for input.

If you are working with MIDI or SoundFont files (SF2/SF3/SFZ), check out soundfont_kit—a companion package that is very helpful for musicians and game developers looking to synthesize instrument audio using SoundFonts with flutter_soloud.

The native code is built with Dart build hooks: no CMake, CocoaPods script phases, or SPM configuration is needed — it works the same whether your app uses CocoaPods or Swift Package Manager.

By default, Xiph audio codecs (Ogg, Vorbis, Opus, FLAC) are linked and bundled from tested prebuilt libraries (xiph/prebuild/<platform>/), ensuring that packaged apps (Android AAB/APK, iOS IPA, macOS APP, Windows EXE) work out of the box with zero external build dependencies. You can also configure:

• System libraries: Set <platform>_use_system_libs: true (e.g. linux_use_system_libs: true) to link system packages.
• Force source build: Set <platform>_force_build_libs: true to clone and compile from source via CMake.
• Without Xiph mode: Set no_xiph_libs: true to exclude Xiph codecs and shrink binary size.

For complete setup instructions and Windows download links, see the Xiph Libraries & Codecs Guide.

Documentation

• Full Documentation
• API Reference

AI Agent Skills

flutter_soloud includes bundled Agent Skills (SKILL.md instruction files) to help AI coding agents (Claude, Cursor, Gemini, GitHub Copilot, Cline, Codex, OpenCode, etc.) generate correct, high-performance code for all features of this audio engine.

Install or update the skills in your project by running:

dart run flutter_soloud:skills

To check whether installed skills are up to date without modifying any files:

dart run flutter_soloud:skills --check

Simple Example

void example() async {
  final soloud = SoLoud.instance;
  await soloud.init();

  await soloud.playSource(asset: 'assets/sound.mp3');
  // or
  final sound = await soloud.loadAsset('assets/sound.mp3');
  final handle = soloud.play(sound);
  
  [...]
  await soloud.deinit();
}

Apps & Games Using flutter_soloud

A showcase of apps and games built with this plugin:

App/Game	Developer	Description
GPhil web MacOS Windows	Vyacheslav Gryaznov	Innovative app designed for musicians to play instrumental concertos with flexible virtual orchestral accompaniment.
Forcebar	Doug Todd	Forcebar is a pure reflex game.
RadioVisualizer	Marco Bavagnoli	Stream over 35,000 live radio stations from every corner of the globe.
Stellar Bastion web Android iOS	Coconut Island Apps	2D Tower Defense game.
Mortigen web Android iOS	Luis Enrique Ruiz	Roguelite survival shooter.
SUMOJI web Android iOS	Valentin Martinet	Fun Emoji-based Sudoku.
GuanDan web MacOS Windows Android iOS	yangyuan	GuanDan (掼蛋) is a popular four-player Chinese card game.
DeReMi Piano: Play & Learn Android	Gent Mecaj	A piano learning app.

Want to add your app? Feel free to open a PR!

License

The Dart plugin is covered by the MIT license. For information about the underlying SoLoud engine license, see the documentation.