AST file
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To do: Document the file format.
AST files contain streamed audio data, and are used in Pikmin 2. To simply play audio files, you can use vgmstream, an audio playback library for multiple video game specific audio formats.
To convert .wav to .ast, you can use JATAST. Make sure to specify adpcm4 encoding, as the GameCube's disc reading (whether on real hardware or emulated with dolphin) will not be able to keep up with large streamed music otherwise.