.dat.txth

# Team Shanghai Alice "thbgm"/"ZWAV" music data
# Header is stored in thXX(tr).dat/thbgm(_tr).fmt
# See: https://github.com/thpatch/thtypes/blob/master/bgm_types.h#L38

header_file         = *.fmt

subsong_spacing     = (0x20 + 0x10) + (0x02 + 0x02)

name_offset         = 0x00
name_size           = 0x10

base_offset         = 0x20                          # WAVEFORMATEX structure
id_value            = 1                             # WAVE_FORMAT_PCM
id_check            = @0x00$2                       # wFormatTag
id_value            = 16
id_check            = @0x0E$2                       # wBitsPerSample
codec               = PCM16LE
channels            = @0x02$2                       # nChannels
sample_rate         = @0x04$4                       # nSamplesPerSec
interleave          = @0x0C$2/channels              # nBlockAlign
base_offset         = 0

start_offset        = @0x10$4
data_size           = @0x1C$4
num_samples         = data_size

sample_type         = bytes
loop_start_sample   = @0x18$4
sample_type         = samples
loop_end_sample     = num_samples

thbgm.dat_th185.txth

# Defines "thbgm" music data properties specific to
# Bulletphilia-tachi no Yami-Ichiba ~ 100th Black Market 

multi_txth       = .dat.txth

subsong_count    = 10

0x14 seems to be always invalid for th08

Specifically always > data_size

No problem using data_size as the default anyway as ZUN likes to have end of file as the the loop ending

NTS 0x14 is not a data size

https://thwiki.cc/%E8%84%9A%E6%9C%AC%E5%AF%B9%E7%85%A7%E8%A1%A8/%E5%85%B6%E4%BB%96#FMT%E6%96%87%E4%BB%B6