sound_recipes

Game audio with no audio files: a sound is a recipe — a length and a function of time — rendered to WAV when the game starts and played through flutter_soloud. Comes with a stock set of sounds for every material, and music that crossfades by mood.

Nothing here is specific to voxels, or to any genre: it is one file of synthesis, a bank and a player.

Status: 0.3.0-dev, beta. The API can still change.

Features

• SoundRecipe + renderWav: a sound is a length and a waveform function.
• StockSounds: break_, place_ and step_ for every SoundFamily, plus hit, hurt, pickup, explode and more.
• SoundBank: plays sounds by name, from recipes or asset files.
• SoundPlayer / SilentSounds: play through an interface, so tests and servers stay silent.
• MusicScore / StockMusic: background music synthesised from notes, six stock loops.
• MusicDirector: one track per mood, crossfaded; a file when the app bundles it, else its recipe.

Install

dependencies:
  sound_recipes: ^0.3.0-dev

Dart SDK ^3.13.0. Needs Flutter (it plays through flutter_soloud).

Usage

1. Make a bank of the stock sounds, plus your own if you like.

   final bank = SoundBank(recipes: {
     ...StockSounds.all,
     'chime': SoundRecipe(0.5, (t, p, rng) => math.sin(t * 880 * math.pi * 2) * (1 - p) * 0.4),
   });
   

2. Open the device once, at start-up. It returns false where there is no audio, and the bank then stays silent.

   WidgetsFlutterBinding.ensureInitialized();
   await bank.init();
   

3. Play by name. volumeDb 0 is full and -6 is about half.

   bank.play('break_${SoundFamily.stone}', volumeDb: -3);
   

4. Music (optional): a mood maps to a file, a recipe, or both — the file plays when the app bundles it, the recipe until then. setMood('night') crossfades.

   final music = MusicDirector(
     {'day': 'assets/music/day.mp3', 'night': 'assets/music/night.mp3'},
     recipes: {'day': StockMusic.pastoral.toRecipe(), 'night': StockMusic.frozen.toRecipe()},
   );
   await music.setMood('day');
   

5. In tests, pass a SilentSounds wherever a SoundPlayer is asked for.

Example

example/main.dart is a sound board: one button for each sound. Copy it into a Flutter app's lib/main.dart and flutter run.