@rgrvmusic/libmad

libmad (multi-format DAW/tracker conversion library) compiled to WebAssembly. Imports MED (MMD0/MMD1), MMD (MMD2/MMD3) and MOD tracker files, exposes the intermediate representation (IR) as JSON, extracts each instrument's PCM as a WAV, and block-renders a clip region to audio, for the "effects Ableton can't do" path (sample offsets, synth patches, vibrato/portamento).

Used by:

• the madimp command-line test app, and
• the MED/MMD Ableton extension webview.

Install

npm install @rgrvmusic/libmad

API

import {
  loadFile, getIrJson, extractSampleWav, renderClip, detectFormat,
} from "@rgrvmusic/libmad";
import { readFileSync } from "node:fs";

const bytes = new Uint8Array(readFileSync("song.mmd"));
await loadFile(bytes);                        // detect + import

const ir = await getIrJson();                 // full IR as JSON
console.log(ir.name, ir.tempo, ir.instruments.length);

for (let i = 0; i < ir.instruments.length; i++) {
  const wav = await extractSampleWav(i);      // RIFF/WAV or null
  if (wav) writeFileSync(`sample_${i}.wav`, wav);
}

const clip = await renderClip({               // block render, whole song
  fromOrder: 0, fromRow: 0, sampleRate: 44100,
});
writeFileSync("clip.wav", clip);

CLI test app (madimp)

madimp info song.mmd                     # IR as JSON
madimp extract song.mmd --out dir/       # per-instrument WAVs + notes.json
madimp render song.mmd --from 0:0 --to 2:63 --rate 44100 --out clip.wav