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resolving note volume and channel volume conflaton

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minjaesong
2026-05-11 10:40:33 +09:00
parent ebba33a5c3
commit a28fcbcefc
6 changed files with 203 additions and 123 deletions
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28
terranmon.txt
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@@ -2144,8 +2144,9 @@ from source.
* Continuous multiplier applied on every output sample (matches IT's
`chan->instrument_volume`, see Schism player/csndfile.c:1317 and
player/sndmix.c:1171). Independent of the volume column / Mxx /
Nxx — those operate on rowVolume/channelVolume, while IGV scales
the final mix unconditionally.
Nxx — the volume column writes the per-note axis (noteVolume),
Mxx/Nxx write the per-channel axis (channelVolume); IGV scales
the final mix unconditionally and is orthogonal to both.
* ImpulseTracker has separate `inst.gv` (0..128) and samplewise
`sample.gv` (0..64). Since Taud has no samplewise record, fold
the two factors into a single 0..255 value:
@@ -2282,15 +2283,17 @@ from source.
spawns inherits that DCA-modified state (e.g. noteFading carries over).
- The new note then triggers normally on the foreground channel.
196 Uint8 Default Note Volume (0..255)
* Per-trigger default for `channelVolume` / `rowVolume` when the row
carries a fresh note + instrument byte but no explicit volume column
(matches IT's `chan->volume = psmp->volume` on note-on, Schism
* Per-trigger default for the per-note volume axis (`noteVolume` in
the engine, analog of IT's `chan->volume`) when the row carries a
fresh note + instrument byte but no explicit volume column (matches
IT's `chan->volume = psmp->volume` on note-on, Schism
player/effects.c:1302 and :1432). The 8-bit value rescales to
Taud's 0..63 row volume range:
row_default = round(default_note_volume * 63 / 255)
Any explicit V column on the trigger row OVERRIDES this — i.e.
rowVolume = vol_value, exactly mirroring IT's "V column replaces
chan->volume" rule.
Taud's 0..63 note-volume range:
note_default = round(default_note_volume * 63 / 255)
Any explicit V column SET on the trigger row OVERRIDES this — i.e.
noteVolume = vol_value, exactly mirroring IT's "V column replaces
chan->volume" rule. The per-channel axis (`channelVolume`, set by
Mxx / Nxx) is independent and is NOT reset on re-trigger.
* Source-format mapping:
- IT: taud_dnv = round(sample.vol * 255 / 64) # 0..64 → 0..255
- XM: taud_dnv = round(sample.volume * 255 / 64) # 0..64 → 0..255
@@ -2472,6 +2475,11 @@ Audio Adapter MMIO
2368..4095 RW: MP2 Frame to be decoded
4096..4097 RO: MP2 Frame guard bytes; always return 0 on read
4098..4353 RW: tracker per-voice fader (0: full volume, 255: full silence) for playhead #0
4354..4609 RW: tracker per-voice fader (0: full volume, 255: full silence) for playhead #1
4610..4865 RW: tracker per-voice fader (0: full volume, 255: full silence) for playhead #2
4866..5121 RW: tracker per-voice fader (0: full volume, 255: full silence) for playhead #3
Sound Hardware Info
- Sampling rate: 32000 Hz
- Bit depth: 8 bits/sample, unsigned