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IT SusLoop

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This commit is contained in:
minjaesong
2026-05-02 14:26:57 +09:00
parent 902ab00132
commit 219ca1e475
3 changed files with 47 additions and 12 deletions
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39
it2taud.py
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@@ -84,6 +84,7 @@ IT_SMP_COMPRESSED = 0x08
IT_SMP_LOOP = 0x10
IT_SMP_SUS_LOOP = 0x20
IT_SMP_PINGPONG = 0x40
IT_SMP_PINGPONG_SUS = 0x80
# Vol-column byte ranges (inclusive lower, inclusive upper)
VC_VOL_LO, VC_VOL_HI = 0, 64
@@ -438,6 +439,8 @@ def parse_samples(data: bytes, h: ITHeader, decompress: bool) -> list:
s.length = len(s.sample_data)
s.loop_beg = min(s.loop_beg, s.length)
s.loop_end = min(s.loop_end, s.length)
s.sus_beg = min(s.sus_beg, s.length)
s.sus_end = min(s.sus_end, s.length)
except Exception as e:
vprint(f" warning: '{s.name}' decompression failed ({e}), silent")
else:
@@ -452,6 +455,8 @@ def parse_samples(data: bytes, h: ITHeader, decompress: bool) -> list:
s.length = len(s.sample_data)
s.loop_beg = min(s.loop_beg, s.length)
s.loop_end = min(s.loop_end, s.length)
s.sus_beg = min(s.sus_beg, s.length)
s.sus_end = min(s.sus_end, s.length)
samples.append(s)
return samples
@@ -1128,6 +1133,8 @@ def build_sample_inst_bin_it(samples_or_proxy: list,
s.length = len(new_data)
s.loop_beg = max(0, int(s.loop_beg * ratio))
s.loop_end = max(0, min(int(s.loop_end * ratio), s.length))
s.sus_beg = max(0, int(s.sus_beg * ratio))
s.sus_end = max(0, min(int(s.sus_end * ratio), s.length))
s.c5_speed = max(1, int(s.c5_speed * ratio))
sample_bin = bytearray(SAMPLEBIN_SIZE)
@@ -1142,7 +1149,9 @@ def build_sample_inst_bin_it(samples_or_proxy: list,
offsets[idx] = pos
if n < len(s.sample_data):
vprint(f" warning: '{s.name}' truncated {len(s.sample_data)} → {n}")
s.length = n; s.loop_end = min(s.loop_end, n)
s.length = n
s.loop_end = min(s.loop_end, n)
s.sus_end = min(s.sus_end, n)
pos += n
# 192-byte instrument layout (terranmon.txt:1997-2070).
@@ -1168,15 +1177,33 @@ def build_sample_inst_bin_it(samples_or_proxy: list,
ptr = offsets.get(i, 0) & 0xFFFFFFFF
s_len = min(s.length, 65535)
c2spd = min(s.c5_speed, 65535)
ls = min(s.loop_beg, 65535)
le = min(s.loop_end, 65535)
if s.has_loop and (s.flags & IT_SMP_PINGPONG):
loop_mode = 2 # backandforth
# Sustain loop wins over the regular loop because Taud carries one loop
# region. After key-off the engine drops the loop entirely (terranmon.txt:2007).
if s.flags & IT_SMP_SUS_LOOP:
ls = min(s.sus_beg, 65535)
le = min(s.sus_end, 65535)
sustain_bit = 0x4
pingpong_active = bool(s.flags & IT_SMP_PINGPONG_SUS)
has_active_loop = True
elif s.has_loop:
ls = min(s.loop_beg, 65535)
le = min(s.loop_end, 65535)
sustain_bit = 0x0
pingpong_active = bool(s.flags & IT_SMP_PINGPONG)
has_active_loop = True
else:
ls = min(s.loop_beg, 65535)
le = min(s.loop_end, 65535)
sustain_bit = 0x0
pingpong_active = False
has_active_loop = False
if has_active_loop and pingpong_active:
loop_mode = 2 # backandforth
elif has_active_loop:
loop_mode = 1 # forward loop
else:
loop_mode = 0 # no loop
flags_byte = loop_mode & 0x3
flags_byte = (loop_mode & 0x3) | sustain_bit
base = taud_idx * 192
struct.pack_into('<I', inst_bin, base + 0, ptr)