class VgmHeader(DataStruct):
nbytes: int = meta('offset', addr=0x04)
version: int = meta('u32', addr=0x08)
nsamp: int = meta('u32', addr=0x18)
ym2612_clock: int = meta('u32', addr=0x2C)
# default arguments
data_addr: int = meta('offset', addr=0x34)
# magic values become default arguments
magic: bytes = meta('magic', arg=b'Vgm ', addr=0x00)
@classmethod
def decode(cls, ptr: Pointer) -> 'VgmHeader':
# do I also have to call super().decode in superclass? Maybe.
obj: VgmHeader = super().decode(ptr)
if obj.version < 0x150:
obj.data_addr = 0x40
return obj
class Write8as8(EventStruct):
reg: int = meta('u8')
value: int = meta('u8')
class PSGWrite(EventStruct):
value: int = meta('u8')
class Wait16Bit(PureWait):
delay: int = meta('u16')
class Wait4Bit(PureWait):
"""0x7n:
wait n+1 samples, n can range from 0 to 15.
"""
delay: int = meta(parameterize=lambda x: x + 1)
class PCMWriteWait(IWait):
"""0x8n:
YM2612 port 0 address 2A write from the file bank, then wait n samples;
n can range from 0 to 15. Note that the wait is n, NOT n+1.
"""
delay: int = meta(parameterize=lambda x: x)
class PCMSeek(EventStruct):
address: int = meta('u32')
class DataBlock(EventStruct):
magic: bytes = meta('hexmagic', '66')
typ: int = meta('u8')
nbytes: int = meta('u32')
file: bytes = meta('bytes_', length='nbytes')