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IT filters

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This commit is contained in:
minjaesong
2026-05-01 23:19:49 +09:00
parent a4adc428d0
commit fe59df18f7
7 changed files with 186 additions and 73 deletions
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10
it2taud.py
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@@ -507,8 +507,10 @@ def parse_instruments(data: bytes, h: ITHeader) -> list:
# Initial filter cutoff/resonance (high bit = enabled, low 7 bits = value)
ifc_raw = data[ptr + 0x39]
ifr_raw = data[ptr + 0x3A]
inst.ifc = ifc_raw & 0x7F if (ifc_raw & 0x80) else 0
inst.ifr = ifr_raw & 0x7F if (ifr_raw & 0x80) else 0
# Taud uses full 0..255 range (double IT's resolution): IT 0..127 → Taud 0..254,
# IT "off" (high bit clear) → Taud 255.
inst.ifc = (ifc_raw & 0x7F) * 2 if (ifc_raw & 0x80) else 255
inst.ifr = (ifr_raw & 0x7F) * 2 if (ifr_raw & 0x80) else 255
# Parse IT envelopes (new-format only, ≥cmwt 0x200)
# Vol envelope at ptr+0x130; pan envelope at ptr+0x182; pf envelope at ptr+0x1D4
@@ -1234,8 +1236,8 @@ def build_sample_inst_bin_it(samples_or_proxy: list,
struct.pack_into('b', inst_bin, base + 180,
max(-128, min(127, idata.get('pps', 0))))
inst_bin[base + 181] = idata.get('pan_swing', 0) & 0xFF
inst_bin[base + 182] = idata.get('ifc', 0) & 0xFF
inst_bin[base + 183] = idata.get('ifr', 0) & 0xFF
inst_bin[base + 182] = idata.get('ifc', 255) & 0xFF
inst_bin[base + 183] = idata.get('ifr', 255) & 0xFF
vprint(f" instrument[{taud_idx}] '{s.name}' ptr:{ptr} c5spd:{s.c5_speed}")