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SF2 specific resample handling

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minjaesong
2026-06-14 10:06:53 +09:00
parent aa2d3263c8
commit 2e9b380843
5 changed files with 312 additions and 98 deletions
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terranmon.txt
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@@ -2771,16 +2771,19 @@ TODO:
[x] Samples and Instruments view (viewer on taut.js; editor on separate .js)
follow the ImpulseTracker design first, then improve from there
[x] Sample desig for instrument in Pitch-Volume space (one rectangle = one patch). If undefined, the old sample pointer falls thru
[ ] taut.js not reading extra samples added by Ixmp process for some reason, which means the samples are on the sample bin but taut.js is not reading them?
[x] taut.js not reading extra samples added by Ixmp process for some reason, which means the samples are on the sample bin but taut.js is not reading them?
[x] Ixmp version 2, supporting per-patch ADSR
For UI concerns, taut_instredit.js will take care of it (aka problem for later)
[x] .sf2 import module (for generic use, including "Import instrument from soundfont" and midi2taud conversion)
[x] Midi2Taud using .mid and .sf2 as input, trim unused samples and Ixmp patches
[ ] .sf2 specific resample handling
[x] .sf2 specific resample handling
1. If length exceeds 65535 samples, calculate resampling.
2. If calculated resampling >= 32000, use that.
3. If not, resample at 32000. If there is no loop defined, then loop the last 8192 samples (converter SHOULD NOT take that number at face value; perform waveform analysis to derive a smoother loop; converter MAY use that number as a starting number) and modify the fade value such that it decays to zero after 10 or so seconds of firing.
[ ] Faithful .sf2 "release segment": Set NNA to 'Note Fade' (incl. drumkits), and make sure Volume Fadeout to have a correct number derived from the SF2 timecent unit (it seems SF2 defines envelope floor as 100 dB; needs check)
[x] Faithful .sf2 "release segment": Set NNA to 'Note Fade' (incl. drumkits), and make sure Volume Fadeout to have a correct number derived from the SF2 timecent unit (it seems SF2 defines envelope floor as 100 dB; needs check)
* DONE 2026-06-14. Floor CONFIRMED 100 dB (sfspec24.txt:1934-1941: releaseVolEnv ramps a constant 100 dB per its timecent value, "until 100dB attenuation were reached"). midi2taud.py now: (a) byte 186 NNA = Note Fade (0b11) for every instrument incl. drum kits (was melodic Key-Lift 0b100000 / drum Continue 0b10); (b) the vol-env no longer carries a release leg — it ENDS at the sustain node and the engine holds there on key-off (AudioAdapter.kt:1697-1701 holds a non-zero terminator, doesn't cut); (c) Volume Fadeout (base bytes 172-173 AND per-patch Ixmp 'x' block) = the release segment, fade_sec = releaseVolEnv·(1000−sus_cb)/1000 (the sustain-level → 100 dB-floor time), fadeStep = 2560/(fade_sec·bpm0) so the linear fade completes in that wall-clock time. Per-patch 'x' now also emits when only the release differs (faithful per-layer release). The engine's Key-Lift feature is unchanged (still used by KeyLiftTest); midi2taud simply stopped emitting it. See _zone_fadeout / _adsr_to_env in midi2taud.py.
[ ] SF2 filter still sounds way too muffled?
[ ] Drum notes get eaten (E2M1.mid)
[ ] auto-set optimal-ish Tickspeed and RPB using MIDI Time Signature events and note analysis. Break pattern when Time Signature changes.
Time Signature