@audio/loudness-lufs

Integrated loudness (LUFS) per ITU-R BS.1770-4: K-weighting → 400 ms gating blocks at 75% overlap → absolute gate (-70 LUFS) → relative gate (-10 LU below the abs-gated mean). Verified against EBU Tech 3341 minimum-requirements test vectors.

npm install @audio/loudness-lufs

import lufs from '@audio/loudness-lufs'

let l = lufs(channels, { fs: 48000 })   // channels: Float32Array (mono) or Float32Array[] (multichannel)
// number (LUFS), or null for silence / fully-gated input

Options: - fs — sample rate (default 48000, Hz — note this differs from the 44100 default used across @audio/spectral) · weights — per-channel gain array, BS.1770-4 Table 1, defaulting by channel count assuming SMPTE/WAV/Web Audio order (1/2ch all 1.0, 4ch [1,1,1.41,1.41], 5ch [1,1,1,1.41,1.41], 6ch [1,1,1,0,1.41,1.41] with LFE excluded; other counts 1.0 per channel)

Part of @audio/loudness.