@moodbar/wasm

WebAssembly bindings for moodbar analysis and rendering.

No audio decode — the browser (or host) decodes audio to mono Float32Array PCM. Calls moodbar-analysis directly; options JSON is parsed via moodbar-bindings-schema.

Install

npm install @moodbar/wasm

Usage

import init, {
  analyze,
  analyze_with_options,
  svg,
  png,
  raw_rgb,
} from "@moodbar/wasm";

await init();

const sampleRate = 44_100;
const pcm = new Float32Array(sampleRate).fill(0);

const analysis = analyze(pcm, sampleRate);

// or with JSON options (GenerateOptionsPatch fields)
const tuned = analyze_with_options(pcm, sampleRate, {
  normalize_mode: "GlobalPeak",
  max_target_frames: 1500,
});

const svgMarkup = svg(analysis, {
  width: 600,
  height: 64,
  shape: "SplitStacked",
});

const pngBytes = png(analysis, { width: 600, height: 64, shape: "SplitStacked" });

const legacyBytes = raw_rgb(analysis);

Svg shape values

Strip, Waveform, SplitStacked, SplitWaveform, SplitLanes, SplitCentrifugal, SplitOverlapping (PascalCase in JSON options).

Split SVG output includes CSS classes (mood-low, mood-mid, mood-high) for styling.

Related crates

• moodbar-analysis — Rust DSP/render core
• moodbar-bindings-schema — option patch types