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#296: Auto-Match measures a mono clip as one channel

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Loudness Auto-Match metered every clip as the stereo pair clip_signal
plays, so a mono source (or a mono pick from Modify > Audio Channels /
Breakout to Mono), copied onto both sides, read 3.01 LU louder than the
file and got 3 dB too little gain. BS.1770 and ffmpeg's ebur128 measure
a mono programme as one channel; now so does clip_loudness, through a new
render::audio::clip_is_mono. Stereo and wider sources are unchanged, as
are the export loudness pass and the Meters panel (they measure the real
output mix).

Regression test: the same speech as a 1-channel WAV and as dual-mono
stereo measure 3.01 LU apart, the mono clip agrees with a one-channel
meter over the file within 0.1 LU, and a mono pick counts as mono.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
This commit is contained in:
Pathos0925
2026-10-08 12:09:15 -05:00
co-authored by Claude Fable 5.1
parent 5231852443
commit 24cde5e9fe
5 changed files with 68 additions and 8 deletions
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docs/architecture.md
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@@ -450,7 +450,7 @@ Clip ▸ Remix ▸ Enable Remix / Remix Properties… / Revert Remix (`clip.remi
```text
clip.essential (type + settings) ──apply()──► clip effects marked `essential`, clip gain, Volume, Panner
essentialSound.autoMatch BS.1770 integrated loudness of render::audio::clip_signal → match gain (clip gain)
essentialSound.autoMatch BS.1770 integrated loudness of render::audio::clip_signal (mono clips as one channel) → match gain (clip gain)
essentialSound.generateDucking trigger clips' summed level (10 ms hops) → activity regions → Volume keyframes
```