From d6625775ce518108836fd339e9bb6c9190761b79 Mon Sep 17 00:00:00 2001 From: Steve Lhomme Date: Thu, 24 Oct 2024 11:03:32 +0200 Subject: [PATCH] add EBU loudness/peak value tags Implements #831 --- matroska_tags.xml | 13 +++++++++++++ rfc_backmatter_tags.md | 38 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 51 insertions(+) diff --git a/matroska_tags.xml b/matroska_tags.xml index fff899215..26bc658a8 100644 --- a/matroska_tags.xml +++ b/matroska_tags.xml @@ -337,6 +337,19 @@ the same tone as the musical piece (e.g., "441.34" in Hertz). The default value The value is a normalized absolute sample value of the target audio stored as a string without spaces (e.g., "1.0129"). Note that ReplayGain information can be found at all TargetType levels (track, album, etc). + + Programme Loudness. + The value is the Loudness, K-weighted, relative to nominal full scale (LKFS) defined in [@!ITU-BS.1770] normalized to a Target Level of -23.0 LUFS as in [@!EBU-R-128]. + This value is stored as a 32-bit floating-point number as defined in [@!IEEE.754] in little-endian order. + + + True-peak level. This corresponds to the "true-peak level", in units of dB True Peak (dbTP), defined in [@!EBU-R-128]. + This value is stored as a 32-bit floating-point number as defined in [@!IEEE.754] in little-endian order. + + + Loudness Range, measures the variation of loudness on a macroscopic time-scale, in units of LU (Loudness Units) as defined in [@!EBU-TECH-3342]. + This value is stored as a 32-bit floating-point number as defined in [@!IEEE.754] in little-endian order. + The International Standard Recording Code [@!ISRC], diff --git a/rfc_backmatter_tags.md b/rfc_backmatter_tags.md index 8575648b6..8a7f3f5b9 100644 --- a/rfc_backmatter_tags.md +++ b/rfc_backmatter_tags.md @@ -1,6 +1,22 @@ {backmatter} + + + LOUDNESS NORMALISATION AND PERMITTED MAXIMUM LEVEL OF AUDIO SIGNALS + + + + + + + + LOUDNESS RANGE: A MEASURE TO SUPPLEMENT EBU R 128 LOUDNESS NORMALIZATION + + + + + GS1 General Specifications @@ -20,6 +36,16 @@ + + + IEEE Standard for Binary Floating-Point Arithmetic + + IEEE + + + + + IMDb API Documentation @@ -61,6 +87,18 @@ + + + Algorithms to measure audio programme loudness and true-peak audio level + + ITU-T + + + + + + + Library Of Congress Control Number