Deezer preview clips are cut from the raw master (not pre-normalized), so
they played several dB hotter than the user's normalized -14 LUFS files —
measured across one artist the previews ranged -0.1 to -8.8 dB from target,
an 8.7 dB spread, so a flat offset would have been wrong either way.
Each clip is now measured with the same BS.1770 meter the main player uses
(preview.rs measure_clip_gain -> loudness::normalization_gain_db) right after
it is written in preview_resolve -- off the async worker, and fully off the
playback path on a prefetched neighbour. The linear gain is stored in the
lease and the reuse cache, and rides UNDER the app-volume mirror per voice
(effective = target_vol * clip_gain), so it composes with the slider, mute
and the crossfade (each clip crosses in at its own matched level). Gated on
the volume_normalization setting; reset on dispose. Debug overlay PREVIEW row
now shows the active clip's norm dB.
Verified live: per-clip gains -0.1..-8.8 dB applied; mute still zeroes the
preview; 39 app + 12 player tests pass.
KeelrLeek
28aba3a3b3
