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taud: amiga mode pitchbend

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minjaesong
2026-04-29 20:07:25 +09:00
parent 1148454fb3
commit b838b35525
9 changed files with 174 additions and 72 deletions
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13
s3m2taud.py
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@@ -79,7 +79,7 @@ EFF_Z = 26 # sync
TAUD_MAGIC = bytes([0x1F,0x54,0x53,0x56,0x4D,0x61,0x75,0x64])
TAUD_VERSION = 1
TAUD_HEADER_SIZE = 32 # magic(8)+ver(1)+numSongs(1)+compSize(4)+rsvd(2)+sig(16)
TAUD_SONG_ENTRY = 16 # offset(4)+voices(1)+pats_lo(1)+pats_hi(1)+bpm(1)+tick(1)+pad(7)
TAUD_SONG_ENTRY = 16 # offset(4)+voices(1)+pats(2)+bpm(1)+tick(1)+basenote(2)+basefreq(4)+flags(1)
SAMPLEBIN_SIZE = 770048
INSTBIN_SIZE = 16384 # 256 instruments × 64 bytes
SAMPLEINST_SIZE = SAMPLEBIN_SIZE + INSTBIN_SIZE # 786432
@@ -898,17 +898,20 @@ def assemble_taud(h: S3MHeader, instruments: list, patterns: list) -> bytes:
pat_bin, pat_remap, num_taud_pats = deduplicate_patterns(bytes(pat_bin), orig_count)
vprint(f" patterns: {orig_count} → {num_taud_pats} unique ({orig_count - num_taud_pats} deduplicated)")
# Song table row (16 bytes): offset(4)+voices(1)+patsLo(1)+patsHi(1)+bpm(1)+tick(1)+basenote(2)+basefreq(4)+pad(1)
# Song table row (16 bytes): offset(4)+voices(1)+pats(2)+bpm(1)+tick(1)+basenote(2)+basefreq(4)+flags(1)
# Built after dedup so num_taud_pats reflects the unique count.
song_table = struct.pack('<IBHBBHf',
# flags byte: bit 1 (f) = Amiga pitch-slide mode (mirrors the S3M linear_slides flag inverted)
flags_byte = 0x00 if h.linear_slides else 0x02
song_table = struct.pack('<IBHBBHfB',
song_offset,
C,
num_taud_pats,
bpm_stored,
speed,
0x9000, # C8
0xA000, # C9
8363.0, # Hz
) + b'\x00'
flags_byte,
)
assert len(song_table) == TAUD_SONG_ENTRY
# Cue sheet (using remapped pattern indices)