@audio/loudness-dr

DR value — TT/dr14 crest-factor dynamic range meter

npm install @audio/loudness-dr

import dr from '@audio/loudness-dr'

DR value per the TT ("Foobar2000 Dynamic Range Meter") / DR14 method used by the Pleasurize Music Foundation — not an EBU/BS.1770 measure, despite living in this loudness family. Per channel: split into 3 s blocks, compute block RMS with the ×2 sine convention (a full-scale sine reads 0 dB) and block peak; DR_ch = 20·log10(secondHighestPeak / rms-of-loudest-20%-blocks). The final value is the average across channels.

dr(channels)                        // default 3 s blocks @ 48000 Hz
dr(channels, { blockSeconds: 1 })   // shorter blocks for brief material

| Param | Default | | |---|---|---| | fs | 48000 | Sample rate, Hz | | blockSeconds | 3 | Analysis block length, seconds |

Accepts Float32Array (mono) or Float32Array[] (multichannel — DR is computed per channel and averaged). Returns a number (DR value in dB), or null if no channel yields at least 2 blocks.

Use when: mastering QC — flag over-compressed/over-limited masters (the "loudness war" DR14 badge popularized by the Pleasurize Music Foundation and the foobar2000/TT meter).

Per the TT/DR14 dynamic range meter specification (Pleasurize Music Foundation), not EBU Tech 3342 — see @audio/loudness-lra for the EBU loudness-range measure.

Part of @audio/loudness — the loudness family umbrella. Documented from the reference implementation.

MIT © audiojs