def make_beat_events(end_beat: song.BeatsTime,
time_map: TimeMap) -> List[Event]:
start = song.BeatsTime(0)
stop = end_beat + song.BeatsTime(1, 2)
step = song.BeatsTime(1)
beats = numeric_range(start, stop, step)
return [make_beat_event(beat, time_map) for beat in beats]
def naive_approach(beats: song.Timing, beat: song.BeatsTime) -> Fraction:
if beat < 0:
raise ValueError("Can't compute seconds at negative beat")
if not beats.events:
raise ValueError("No BPM defined")
grouped_by_time = group_by(beats.events, key=lambda e: e.time)
for time, events in grouped_by_time.items():
if len(events) > 1:
raise ValueError(
f"Multiple BPMs defined on beat {time} : {events}")
sorted_events = sorted(beats.events, key=lambda e: e.time)
first_event = sorted_events[0]
if first_event.time != song.BeatsTime(0):
raise ValueError("First BPM event is not on beat zero")
if beat > sorted_events[-1].time:
events_before = sorted_events
else:
last_index = next(i for i, e in enumerate(sorted_events)
if e.time >= beat)
events_before = sorted_events[:last_index]
total_seconds = Fraction(0)
current_beat = beat
for event in reversed(events_before):
beats_since_previous = current_beat - event.time
seconds_since_previous = (60 * beats_since_previous) / Fraction(
event.BPM)
total_seconds += seconds_since_previous
current_beat = event.time
total_seconds = total_seconds + Fraction(beats.beat_zero_offset)
return total_seconds
def load_memon_0_1_0(path: Path, **kwargs: Any) -> jbt.Song:
raw_memon = _load_raw_memon(path)
schema = Memon_0_1_0()
memon = schema.load(raw_memon)
metadata = jbt.Metadata(
title=memon["metadata"]["title"],
artist=memon["metadata"]["artist"],
audio=Path(memon["metadata"]["audio"]),
cover=Path(memon["metadata"]["cover"]),
)
common_timing = jbt.Timing(
events=[
jbt.BPMEvent(time=jbt.BeatsTime(0), BPM=memon["metadata"]["BPM"])
],
beat_zero_offset=jbt.SecondsTime(-memon["metadata"]["offset"]),
)
charts: MultiDict[jbt.Chart] = MultiDict()
for difficulty, memon_chart in memon["data"].items():
charts.add(
difficulty,
jbt.Chart(
level=memon_chart["level"],
notes=[
_load_memon_note_v0(note, memon_chart["resolution"])
for note in memon_chart["notes"]
],
),
)
return jbt.Song(metadata=metadata,
charts=charts,
common_timing=common_timing)
def dump_bgm(audio: Path, timing: song.Timing) -> malody.Sound:
return malody.Sound(
beat=beats_to_tuple(song.BeatsTime(0)),
sound=str(audio),
vol=100,
offset=-int(timing.beat_zero_offset * 1000),
type=malody.SoundType.BACKGROUND_MUSIC,
isBgm=None,
x=None,
)
def convert_to_timing_info(self, beat_snap: int = 240) -> song.Timing:
return song.Timing(
events=[
song.BPMEvent(
time=round_beats(e.beats, beat_snap),
BPM=fraction_to_decimal(e.BPM),
)
for e in self.events_by_beats
],
beat_zero_offset=self.seconds_at(song.BeatsTime(0)),
)
def compute_last_note_beat(notes: List[AnyNote]) -> song.BeatsTime:
"""Returns the last beat at which a note event happens, either a tap note,
the start of a long note or the end of a long note.
If we don't take long notes ends into account we might end up with a long
note end happening after the END tag which will cause jubeat to freeze when
trying to render the note density graph"""
note_times = set(n.time for n in notes)
long_note_ends = set(n.time + n.duration for n in notes
if isinstance(n, song.LongNote))
all_note_times = note_times | long_note_ends
return max(all_note_times, default=song.BeatsTime(0))
def test_that_notes_roundtrip(
notes: List[Union[song.TapNote, song.LongNote]]) -> None:
timing = song.Timing(
events=[song.BPMEvent(song.BeatsTime(0), Decimal(120))],
beat_zero_offset=song.SecondsTime(0),
)
chart = song.Chart(
level=Decimal(0),
timing=timing,
notes=sorted(notes, key=lambda n: (n.time, n.position)),
)
metadata = song.Metadata("", "", Path(""), Path(""))
string_io = _dump_memo1_chart("", chart, metadata, timing)
chart_text = string_io.getvalue()
parser = Memo1Parser()
for line in chart_text.split("\n"):
parser.load_line(line)
parser.finish_last_few_notes()
actual = set(parser.notes())
assert notes == actual
def choose_end_beat(notes: List[AnyNote]) -> song.BeatsTime:
"""Leave 2 empty measures (4 beats) after the last event"""
last_note_beat = compute_last_note_beat(notes)
measure = last_note_beat - (last_note_beat % 4)
return measure + song.BeatsTime(2 * 4)
def round_beats(beats: Number, denominator: int = 240) -> song.BeatsTime:
"""Rounds a given beat value to the nearest given division (default to
nearest 1/240th"""
nearest = round(beats * denominator)
return song.BeatsTime(nearest, denominator)
def tuple_to_beats(b: Tuple[int, int, int]) -> song.BeatsTime:
return b[0] + song.BeatsTime(b[1], b[2])
