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converters.py: Add tana's fix for mid-measure BPM changes

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Viv 2023-06-02 16:33:45 -04:00
parent c0288bb0b2
commit c17218d362
1 changed files with 15 additions and 7 deletions
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tja2fumen/converters.py
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@ -110,13 +110,19 @@ def convertTJAToFumen(fumen, tja):
for idx_m, measureTJA in enumerate(tja['measures']):
measureFumen = deepcopy(default_measure)
# Compute the fumenOffset
# Compute the fumenOffset change (i.e. the duration of the measure).
measureSize = measureTJA['time_sig'][0] / measureTJA['time_sig'][1]
measureLength = measureTJA['pos_end'] - measureTJA['pos_start']
if measureLength == measureTJA['subdivisions']:
measureRatio = 1.0 # This avoids the case of a measure with no notes --> 0 / 0 --> DivisionByZeroError
else:
measureRatio = measureLength / measureTJA['subdivisions']
measureDuration = (240_000 / measureTJA['bpm']) * measureRatio
measureRatio = 1.0 if measureTJA['subdivisions'] == 0.0 else (measureLength / measureTJA['subdivisions'])
# - measureDurationBase: The "base" measure duration, computed using a single BPM value.
# - measureDuration: The actual measure duration, which may be adjusted if there is a mid-measure BPM change.
measureDurationBase = measureDuration = (4 * 60_000 * measureSize * measureRatio / measureTJA['bpm'])
# The following adjustment accounts for mid-measure BPM changes. (!!! Discovered by tana :3 !!!)
if measureRatio != 1.0:
measureTJANext = tja['measures'][idx_m+1]
measureDuration -= (4 * 60_000 * ((1 / measureTJANext['bpm']) - (1 / measureTJA['bpm'])))
# Apply the change in offset to the overall offset to get the measure offset
# This is a bodge I'm using just for Rokuchounen to Ichiya Monogatari
# Its first measure happens _before_ the first barline
# So, we actually need to shift the offsets by 1 to get everything to line up
@ -135,7 +141,9 @@ def convertTJAToFumen(fumen, tja):
pass
elif data['type'] == 'note':
note = deepcopy(default_note)
note['pos'] = measureDuration * (data['pos'] - measureTJA['pos_start']) / measureLength
# Note positions must be calculated using the base measure duration (that uses a single BPM value)
# (In other words, note positions do not take into account any mid-measure BPM change adjustments.)
note['pos'] = measureDurationBase * (data['pos'] - measureTJA['pos_start']) / measureLength
note['type'] = data['value'] # TODO: Handle BALLOON/DRUMROLL
note['scoreInit'] = tja['scoreInit'] # Probably not fully accurate
note['scoreDiff'] = tja['scoreDiff'] # Probably not fully accurate