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taud: cue and pattern compression

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This commit is contained in:
minjaesong
2026-05-02 19:00:07 +09:00
parent 219ca1e475
commit d2b1e792b9
7 changed files with 212 additions and 109 deletions
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37
taud_common.py
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@@ -28,8 +28,8 @@ def vprint(*a, **kw) -> None:
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(4)+sig(14)
TAUD_SONG_ENTRY = 16 # offset(4)+voices(1)+pats(2)+bpm(1)+tick(1)+basenote(2)+basefreq(4)+flags(1)
TAUD_HEADER_SIZE = 32 # magic(8)+ver(1)+numSongs(1)+compSize(4)+projOff(4)+sig(14)
TAUD_SONG_ENTRY = 32 # full spec entry (see encode_song_entry)
SAMPLEBIN_SIZE = 737280
INSTBIN_SIZE = 49152 # 256 instruments × 192 bytes
SAMPLEINST_SIZE = SAMPLEBIN_SIZE + INSTBIN_SIZE
@@ -166,6 +166,39 @@ def deduplicate_patterns(pat_bin: bytes, num_pats: int) -> tuple:
return b''.join(canonical), remap, len(canonical)
def encode_song_entry(song_offset: int, num_voices: int, num_patterns: int,
bpm_stored: int, tick_rate: int,
base_note: int, base_freq: float, flags_byte: int,
pat_bin_comp_size: int, cue_sheet_comp_size: int,
global_vol: int = 0x80, mixing_vol: int = 0x80) -> bytes:
"""Pack a 32-byte Taud song table entry.
Layout:
u32 song_offset, u8 num_voices, u16 num_patterns,
u8 bpm_stored, u8 tick_rate,
u16 base_note, f32 base_freq,
u8 flags, u8 global_vol, u8 mixing_vol,
u32 pat_bin_comp_size, u32 cue_sheet_comp_size,
byte[6] reserved.
"""
entry = struct.pack('<IBHBBHfBBBII',
song_offset,
num_voices & 0xFF,
num_patterns & 0xFFFF,
bpm_stored & 0xFF,
tick_rate & 0xFF,
base_note & 0xFFFF,
float(base_freq),
flags_byte & 0xFF,
global_vol & 0xFF,
mixing_vol & 0xFF,
pat_bin_comp_size & 0xFFFFFFFF,
cue_sheet_comp_size & 0xFFFFFFFF,
) + b'\x00' * 6
assert len(entry) == TAUD_SONG_ENTRY
return entry
def normalise_sample(raw: bytes, signed: bool, is_16bit: bool,
is_stereo: bool, name: str) -> bytes:
"""Return unsigned 8-bit mono sample bytes, downmixing/depthing as needed."""