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pynbs.py
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pynbs.py
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from __future__ import print_function, division, absolute_import
try:
from builtins import range
except ImportError:
range = xrange
from struct import Struct
from collections import namedtuple
__all__ = ['read', 'new_file', 'Parser', 'Writer', 'File', 'Header',
'Note', 'Layer', 'Instrument']
BYTE = Struct('<b')
SHORT = Struct('<h')
INT = Struct('<i')
Note = namedtuple('Note', ['tick', 'layer', 'instrument', 'key'])
Layer = namedtuple('Layer', ['id', 'name', 'volume'])
Instrument = namedtuple('Instrument', ['id', 'name', 'file', 'pitch',
'press_key'])
def read(filename):
with open(filename, 'rb') as buff:
return Parser(buff).read_file()
def new_file(**header):
return File(Header(**header), [], [Layer(0, '', 100)], [])
class Header(object):
def __init__(self, **header):
header_values = {
'song_length': header.get('song_length', 0),
'song_layers': header.get('song_layers', 0),
'song_name': header.get('song_name', ''),
'song_author': header.get('song_author', ''),
'original_author': header.get('original_author', ''),
'description': header.get('description', ''),
'tempo': header.get('tempo', 10.0),
'auto_save': header.get('auto_save', False),
'auto_save_duration': header.get('auto_save_duration', 10),
'time_signature': header.get('time_signature', 4),
'minutes_spent': header.get('minutes_spent', 0),
'left_clicks': header.get('left_clicks', 0),
'right_clicks': header.get('right_clicks', 0),
'blocks_added': header.get('blocks_added', 0),
'blocks_removed': header.get('blocks_removed', 0),
'song_origin': header.get('song_origin', ''),
}
for key, value in header_values.items():
setattr(self, key, value)
class File(object):
def __init__(self, header, notes, layers, instruments):
self.header = header
self.notes = notes
self.layers = layers
self.instruments = instruments
def update_header(self):
if self.notes:
self.header.song_length = self.notes[-1].tick
self.header.song_layers = len(self.layers)
def save(self, filename):
self.update_header()
with open(filename, 'wb') as buff:
Writer(buff).encode_file(self)
def __iter__(self):
if not self.notes:
return
chord = []
current_tick = self.notes[0].tick
for note in sorted(self.notes, key=lambda n: n.tick):
if note.tick == current_tick:
chord.append(note)
else:
chord.sort(key=lambda n: n.layer)
yield current_tick, chord
current_tick, chord = note.tick, [note]
yield current_tick, chord
class Parser(object):
def __init__(self, buff):
self.buffer = buff
def read_file(self):
header = Header(**self.parse_header())
return File(header, list(self.parse_notes()),
list(self.parse_layers(header.song_layers)),
list(self.parse_instruments()))
def read_numeric(self, fmt):
return fmt.unpack(self.buffer.read(fmt.size))[0]
def read_string(self):
length = self.read_numeric(INT)
return self.buffer.read(length).decode()
def jump(self):
value = -1
while True:
jump = self.read_numeric(SHORT)
if not jump:
break
value += jump
yield value
def parse_header(self):
return {
'song_length': self.read_numeric(SHORT),
'song_layers': self.read_numeric(SHORT),
'song_name': self.read_string(),
'song_author': self.read_string(),
'original_author': self.read_string(),
'description': self.read_string(),
'tempo': self.read_numeric(SHORT) / 100.0,
'auto_save': self.read_numeric(BYTE) == 1,
'auto_save_duration': self.read_numeric(BYTE),
'time_signature': self.read_numeric(BYTE),
'minutes_spent': self.read_numeric(INT),
'left_clicks': self.read_numeric(INT),
'right_clicks': self.read_numeric(INT),
'blocks_added': self.read_numeric(INT),
'blocks_removed': self.read_numeric(INT),
'song_origin': self.read_string(),
}
def parse_notes(self):
for current_tick in self.jump():
for current_layer in self.jump():
yield Note(current_tick, current_layer,
self.read_numeric(BYTE), self.read_numeric(BYTE))
def parse_layers(self, layers_count):
for i in range(layers_count):
yield Layer(i, self.read_string(), self.read_numeric(BYTE))
def parse_instruments(self):
for i in range(self.read_numeric(BYTE)):
yield Instrument(i, self.read_string(), self.read_string(),
self.read_numeric(BYTE),
self.read_numeric(BYTE) == 1)
class Writer(object):
def __init__(self, buff):
self.buffer = buff
def encode_file(self, nbs_file):
self.write_header(nbs_file)
self.write_notes(nbs_file)
self.write_layers(nbs_file)
self.write_instruments(nbs_file)
def encode_numeric(self, fmt, value):
self.buffer.write(fmt.pack(value))
def encode_string(self, value):
self.encode_numeric(INT, len(value))
self.buffer.write(value.encode())
def write_header(self, nbs_file):
header = nbs_file.header
self.encode_numeric(SHORT, header.song_length)
self.encode_numeric(SHORT, header.song_layers)
self.encode_string(header.song_name)
self.encode_string(header.song_author)
self.encode_string(header.original_author)
self.encode_string(header.description)
self.encode_numeric(SHORT, int(header.tempo * 100))
self.encode_numeric(BYTE, int(header.auto_save))
self.encode_numeric(BYTE, header.auto_save_duration)
self.encode_numeric(BYTE, header.time_signature)
self.encode_numeric(INT, header.minutes_spent)
self.encode_numeric(INT, header.left_clicks)
self.encode_numeric(INT, header.right_clicks)
self.encode_numeric(INT, header.blocks_added)
self.encode_numeric(INT, header.blocks_removed)
self.encode_string(header.song_origin)
def write_notes(self, nbs_file):
current_tick = -1
for tick, chord in nbs_file:
self.encode_numeric(SHORT, tick - current_tick)
current_tick = tick
current_layer = -1
for note in chord:
self.encode_numeric(SHORT, note.layer - current_layer)
current_layer = note.layer
self.encode_numeric(BYTE, note.instrument)
self.encode_numeric(BYTE, note.key)
self.encode_numeric(SHORT, 0)
self.encode_numeric(SHORT, 0)
def write_layers(self, nbs_file):
for layer in nbs_file.layers:
self.encode_string(layer.name)
self.encode_numeric(BYTE, layer.volume)
def write_instruments(self, nbs_file):
self.encode_numeric(BYTE, len(nbs_file.instruments))
for instrument in nbs_file.instruments:
self.encode_string(instrument.name)
self.encode_string(instrument.file)
self.encode_numeric(BYTE, instrument.pitch)
self.encode_numeric(BYTE, int(instrument.press_key))