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minifloat redefined

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minjaesong
2026-05-07 02:01:30 +09:00
parent 59bbe9e503
commit 449885c1ea
5 changed files with 121 additions and 151 deletions
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58
it2taud.py
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@@ -53,7 +53,7 @@ from taud_common import (
EFF_U, EFF_V, EFF_W, EFF_X, EFF_Y, EFF_Z,
J_SEMI_TABLE,
d_arg_to_col, resample_linear, rescale_offset_effects, encode_cue, deduplicate_patterns,
normalise_sample, encode_song_entry,
normalise_sample, encode_song_entry, nearest_minifloat,
CUE_INST_NOP, CUE_INST_HALT, CUE_INST_LEN, cue_instruction_len,
)
@@ -117,60 +117,6 @@ IT_MEM_EFFECTS = frozenset({
SIGNATURE = b'it2taud/TSVM ' # 14 bytes
# ThreeFiveMiniUfloat LUT — 256 entries, seconds 0.0..126.0 (must match Kotlin)
_MINUFLOAT_LUT = [
0.0, 0.03125, 0.0625, 0.09375, 0.125, 0.15625, 0.1875, 0.21875,
0.25, 0.28125, 0.3125, 0.34375, 0.375, 0.40625, 0.4375, 0.46875,
0.5, 0.53125, 0.5625, 0.59375, 0.625, 0.65625, 0.6875, 0.71875,
0.75, 0.78125, 0.8125, 0.84375, 0.875, 0.90625, 0.9375, 0.96875,
1.0, 1.03125, 1.0625, 1.09375, 1.125, 1.15625, 1.1875, 1.21875,
1.25, 1.28125, 1.3125, 1.34375, 1.375, 1.40625, 1.4375, 1.46875,
1.5, 1.53125, 1.5625, 1.59375, 1.625, 1.65625, 1.6875, 1.71875,
1.75, 1.78125, 1.8125, 1.84375, 1.875, 1.90625, 1.9375, 1.96875,
2.0, 2.0625, 2.125, 2.1875, 2.25, 2.3125, 2.375, 2.4375,
2.5, 2.5625, 2.625, 2.6875, 2.75, 2.8125, 2.875, 2.9375,
3.0, 3.0625, 3.125, 3.1875, 3.25, 3.3125, 3.375, 3.4375,
3.5, 3.5625, 3.625, 3.6875, 3.75, 3.8125, 3.875, 3.9375,
4.0, 4.125, 4.25, 4.375, 4.5, 4.625, 4.75, 4.875,
5.0, 5.125, 5.25, 5.375, 5.5, 5.625, 5.75, 5.875,
6.0, 6.125, 6.25, 6.375, 6.5, 6.625, 6.75, 6.875,
7.0, 7.125, 7.25, 7.375, 7.5, 7.625, 7.75, 7.875,
8.0, 8.25, 8.5, 8.75, 9.0, 9.25, 9.5, 9.75,
10.0, 10.25, 10.5, 10.75, 11.0, 11.25, 11.5, 11.75,
12.0, 12.25, 12.5, 12.75, 13.0, 13.25, 13.5, 13.75,
14.0, 14.25, 14.5, 14.75, 15.0, 15.25, 15.5, 15.75,
16.0, 16.5, 17.0, 17.5, 18.0, 18.5, 19.0, 19.5,
20.0, 20.5, 21.0, 21.5, 22.0, 22.5, 23.0, 23.5,
24.0, 24.5, 25.0, 25.5, 26.0, 26.5, 27.0, 27.5,
28.0, 28.5, 29.0, 29.5, 30.0, 30.5, 31.0, 31.5,
32.0, 33.0, 34.0, 35.0, 36.0, 37.0, 38.0, 39.0,
40.0, 41.0, 42.0, 43.0, 44.0, 45.0, 46.0, 47.0,
48.0, 49.0, 50.0, 51.0, 52.0, 53.0, 54.0, 55.0,
56.0, 57.0, 58.0, 59.0, 60.0, 61.0, 62.0, 63.0,
64.0, 66.0, 68.0, 70.0, 72.0, 74.0, 76.0, 78.0,
80.0, 82.0, 84.0, 86.0, 88.0, 90.0, 92.0, 94.0,
96.0, 98.0, 100.0, 102.0, 104.0, 106.0, 108.0, 110.0,
112.0, 114.0, 116.0, 118.0, 120.0, 122.0, 124.0, 126.0,
]
def _nearest_minifloat(sec: float) -> int:
"""Return ThreeFiveMiniUfloat index (0-255) for the nearest representable seconds value."""
if sec <= 0.0:
return 0
if sec >= 126.0:
return 255
lo, hi = 0, len(_MINUFLOAT_LUT) - 1
while lo < hi:
mid = (lo + hi) // 2
if _MINUFLOAT_LUT[mid] < sec:
lo = mid + 1
else:
hi = mid
# lo is first index where LUT[lo] >= sec; check lo-1 for nearest
if lo > 0 and abs(_MINUFLOAT_LUT[lo - 1] - sec) <= abs(_MINUFLOAT_LUT[lo] - sec):
return lo - 1
return lo
# ── IT header parser ──────────────────────────────────────────────────────────
@@ -626,7 +572,7 @@ def _parse_it_envelope(data: bytes, env_ptr: int, kind: str,
if k < len(nodes) - 1:
_, next_tick = nodes[k + 1]
delta_sec = max(0.0, (next_tick - tick) / ticks_per_sec)
mf_idx = _nearest_minifloat(delta_sec)
mf_idx = nearest_minifloat(delta_sec)
else:
mf_idx = 0
else: