Start gain resolves from the loudness cache, then from ReplayGain tags in
the bytes; the catalog's own ReplayGain is fetched once per track alongside
the CMAF setup (and the cached replays, the disk replay and the gapless
download), and a prefetched track the catalog cannot describe is
pre-analysed in full (EBU R128 + true peak) off the audio thread, reading
the bytes back from the playback cache since the prefetch streams them
straight in. DynamicAmplify now starts AT that gain instead of ramping from
unity, the published normalization gain is the real one, and the four
seeding sites share one resolver (normalization::plan_start_gain).
cc
vicrodh
ec7311ce54