Try it in the browser: Loudness meter and normalizer. Runs on this package, nothing is uploaded.
Loudness metering per ITU-R BS.1770-4 / EBU R128 — umbrella re-exporting every
@audio/loudness-*atom.
import { lufs, truepeak, lra, replaygain, dr, speechContrast, sounds } from '@audio/loudness'
lufs(channels, { fs: 48000 }) // integrated LUFS
replaygain(channels, { fs: 48000 }) // { gain, lufs, peak }Each atom ships standalone:
| Atom | Measures |
|---|---|
@audio/loudness-lufs |
Integrated loudness (LUFS) — BS.1770-4 K-weighted gated, EBU Tech 3341-verified |
@audio/loudness-truepeak |
True peak (dBTP) — 4× sinc-oversampled inter-sample peak, BS.1770-4 Annex 2 |
@audio/loudness-lra |
Loudness range (LRA) — EBU Tech 3342 short-term distribution, P95−P10 after gating |
@audio/loudness-replaygain |
ReplayGain 2.0 — track gain to the −18 LUFS reference + sample peak |
@audio/loudness-dr |
DR value — TT/dr14 crest-factor dynamic range |
@audio/loudness-contrast |
Speech contrast — foreground/background RMS difference, WCAG 2.0 SC 1.4.7 |
@audio/loudness-sounds |
Sound labeling — level-threshold region detection (Audacity Label Sounds) |
Multichannel weights default to BS.1770-4 Table 1 by channel count (SMPTE/WAV/Web Audio order, LFE excluded). K-weighting lives in @audio/weighting-k — exact BS.1770-4 at any sample rate.
Bare npm loudness is an unrelated package — hence the scope.
