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Audio: speech leveler (auto gain to -20 dBFS speech, -6..+20 dB, gated) between gate and compressor; honest mic meter (drop the +10 dB display boost and x1.2). Creator upload measured -28.5 LUFS; same audio through the new chain: -17.9 LUFS / -0.7 dBFS peak (Unit: audio loudness)

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gramps
2026-10-09 13:27:53 -07:00
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@@ -1038,11 +1038,21 @@ devices, no timers).
`Shutdown` disposes it — NOT go-live — so the meters preview live. Mic samples: downmix to mono →
`TinyResampler` → **`VoiceFilterChain` per sample** (bass `LowShelfFilter` 120 Hz +4 dB → treble
`HighShelfFilter` 8 kHz +3 dB → `NoiseGate` (threshold 0.005, hysteresis 0.5, attack 0.5, release
0.0005) → `Compressor` (threshold 0.5, ratio 4:1); all pure TDF2 DSP) → ring buffer → the
0.0005) → **`SpeechLeveler`** (2026-10-09: automatic gain steering speech RMS to −20 dBFS over a
0.3 s window, gain −6..+20 dB, rises ≤10 dB/s / falls ≤30 dB/s, learns only while the gate is open
and above −54 dBFS so pauses/hum are never pumped) → `Compressor` (threshold 0.5, ratio 4:1); all
pure DSP) → ring buffer → the
**post-filter** `AudioLevelMeter` (RMS, 0.2 exponential smoothing) → `MicLevelChanged` →
marshalled to the UI thread → `AudioLevel`. Loopback samples: resample → ring buffer → second meter
→ `LoopbackLevelChanged` → the game bar's `GameAudioLevel`. The raw linear level maps to the meter's
display scale by `AudioLevelMeter.ToDisplay` (−60..0 dBFS → 0..1 with **+10 dB input amplification**).
display scale by `AudioLevelMeter.ToDisplay` (−60..0 dBFS → 0..1, **honest** — the +10 dB display boost
was removed 2026-10-09; the mic meter is `ToDisplay(AudioLevel × MicVolume)`, true dB math, no ×1.2).
**Why (2026-10-09):** a creator's YouTube upload measured −28.5 LUFS / −8.9 dBFS peak against YouTube's
−14 LUFS reference (YouTube only turns loud videos down, never quiet ones up) while the boosted meter
looked "dialed in". Nothing in the chain added gain — the compressor folds only above −6 dBFS and the
limiter only caps. Re-running that same audio through the new chain (mic volume 0.8): **−17.9 LUFS,
−0.7 dBFS peak**. Recording and streaming share this one mix, so both were (and now are) the same.
Measure with the bundled ffmpeg: `ffmpeg -i file -af ebur128=peak=true:framelog=quiet -f null -`.
**Mic connection state surfaces as events:** `MicConnected` (source `Started`), `MicFailed` (source
`Failed`), and `RestartMic()` re-resolves + restarts just the mic (loopback keeps running). Failures
log via `AppLog`; a mic failure zeroes the meter, a loopback failure never kills the mic. Meter `Push`