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SPL Meter 0.4.0: a dead input must not look like a quiet room

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AB's meter appeared to halt for a day and a half. Nothing had halted: the
capture child had run continuously since the machine was restarted, never
stalled, never exited, and was delivering twenty frames a second. Every one
of them was digital silence, because Dante Via stopped passing audio after
the reboot — the Timers module's LTC listener, on channel 16 of the same
device, had been reporting no signal for exactly as long.

The module's part in that was reporting "ok" through all of it and drawing
a steady -83, which is the -200 floor plus the +117 calibration offset. A
plausible number on a wall is believed, and a green dot beside it says the
number is worth believing. That is worse than showing nothing.

So silence is now a state the module names. Below -150 dBFS unweighted the
input is not quiet, it is absent: a microphone in a silent room still reads
about -83, and even a muted converter dithers. Five seconds of that on every
channel and health() goes to error naming the device and how long it has
been dead, the tiles stop drawing a level and say "No audio" with how long,
and the status dot goes red.

Verified both directions, which is the half that matters: BlackHole with
nothing routed into it is caught in five seconds, and a real microphone in a
quiet room at -49 dBFS is never flagged.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Waters Church
2026-09-23 09:54:27 -04:00
co-authored by Claude Opus 5
parent f4d50f5e95
commit c464e5b4ca
4 changed files with 85 additions and 7 deletions
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modules/spl-meter/style.css
+6
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@@ -57,6 +57,11 @@
[data-module="spl-meter"] .spl-readout[data-level="alarm"] .spl-num { color: var(--danger); }
[data-module="spl-meter"] .spl-readout[data-level="idle"] .spl-num { color: var(--muted); }
/* A dead input reads danger, not muted: silence that is a fault should not
look like silence that is a quiet room. */
[data-module="spl-meter"] .spl-readout[data-level="dead"] .spl-num { color: var(--danger); }
[data-module="spl-meter"] .spl-readout[data-level="dead"] .spl-sub { color: var(--danger); }
/* ── level bars ───────────────────────────────────────────────────── */
[data-module="spl-meter"] .spl-bars {
@@ -100,6 +105,7 @@
[data-module="spl-meter"] .spl-bar[data-level="warn"] .spl-bar-fill { background: var(--warn); }
[data-module="spl-meter"] .spl-bar[data-level="alarm"] .spl-bar-fill { background: var(--danger); }
[data-module="spl-meter"] .spl-bar[data-level="idle"] .spl-bar-fill { background: var(--muted); }
[data-module="spl-meter"] .spl-bar[data-level="dead"] .spl-bar-value { color: var(--danger); }
/* Peak hold sits on the track rather than inside the fill, so it stays
visible when the bar falls away underneath it. */