Taiko_Stuff/tja2fumen
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converters.py: Improve comments in convertTJAToFumen function

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Viv 2023-07-09 16:08:49 -04:00
parent fac814f6de
commit bc21f5a31d
1 changed files with 35 additions and 19 deletions
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54
src/tja2fumen/converters.py
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@ -125,8 +125,11 @@ def processTJACommands(tja):
def convertTJAToFumen(tja):
# Preprocess commands
tja['branches'] = processTJACommands(tja)
# Parse TJA measures to create converted TJA -> Fumen file
# Pre-allocate the measures for the converted TJA
tjaConverted = {'measures': [deepcopy(default_measure) for _ in range(len(tja['branches']['normal']))]}
# Iterate through the different branches in the TJA
for currentBranch, branch in tja['branches'].items():
if not len(branch):
continue
@ -135,24 +138,31 @@ def convertTJAToFumen(tja):
note_counter_branch = 0
currentDrumroll = None
courseBalloons = tja['metadata']['balloon'].copy()
# Iterate through the measures within the branch
for idx_m, measureTJA in enumerate(branch):
# Fetch a pair of measures
measureFumenPrev = tjaConverted['measures'][idx_m-1] if idx_m != 0 else None
measureFumen = tjaConverted['measures'][idx_m]
# Apply basic measure properties (that don't depend on notes or commands)
# Copy over basic measure properties from the TJA (that don't depend on notes or commands)
measureFumen[currentBranch]['speed'] = measureTJA['scroll']
measureFumen['gogo'] = measureTJA['gogo']
measureFumen['bpm'] = measureTJA['bpm']
# Compute the duration of the measure
measureSize = measureTJA['time_sig'][0] / measureTJA['time_sig'][1]
measureLength = measureTJA['pos_end'] - measureTJA['pos_start']
measureRatio = 1.0 if measureTJA['subdivisions'] == 0.0 else (measureLength / measureTJA['subdivisions'])
# First, we compute the duration for a full 4/4 measure
measureDurationFullMeasure = 4 * 60_000 / measureTJA['bpm']
# Adjust the duration based on both:
# 1. Measure size (e.g. #MEASURE 1/8, #MEASURE 5/4, etc.)
# 2. Whether this is a "submeasure" (i.e. it contains mid-measure commands, splitting up the measure)
# Next, we adjust this duration based on both:
# 1. The *actual* measure size (e.g. #MEASURE 1/8, #MEASURE 5/4, etc.)
measureSize = measureTJA['time_sig'][0] / measureTJA['time_sig'][1]
# 2. Whether this is a "submeasure" (i.e. it contains mid-measure commands, which split up the measure)
# - If this is a submeasure, then `measureLength` will be less than the total number of subdivisions.
measureLength = measureTJA['pos_end'] - measureTJA['pos_start']
# - In other words, `measureRatio` will be less than 1.0:
measureRatio = (1.0 if measureTJA['subdivisions'] == 0.0 # Avoid division by 0 for empty measures
else (measureLength / measureTJA['subdivisions']))
# Apply the 2 adjustments to the measure duration
measureFumen['duration'] = measureDuration = measureDurationFullMeasure * measureSize * measureRatio
# Compute the millisecond offsets for the start and end of each measure
@ -162,9 +172,9 @@ def convertTJAToFumen(tja):
tjaOffset = float(tja['metadata']['offset']) * 1000 * -1
measureFumen['fumenOffsetStart'] = tjaOffset - measureDurationFullMeasure
else:
# Start the measure using the end timing of the previous measure (plus any #DELAY commands)
# First, start the measure using the end timing of the previous measure (plus any #DELAY commands)
measureFumen['fumenOffsetStart'] = measureFumenPrev['fumenOffsetEnd'] + measureTJA['delay']
# Adjust the start of this measure to account for #BPMCHANGE commands (!!! Discovered by tana :3 !!!)
# Next, adjust the start timing to account for #BPMCHANGE commands (!!! Discovered by tana :3 !!!)
# To understand what's going on here, imagine the following simple example:
# * You have a very slow-moving note (i.e. low BPM), like the big DON in Donkama 2000.
# * All the other notes move fast (i.e. high BPM), moving past the big slow note.
@ -190,17 +200,23 @@ def convertTJAToFumen(tja):
# Check to see if the measure contains a branching condition
if measureTJA['branchStart']:
# Determine which values to assign based on the type of branching condition
if measureTJA['branchStart'][0] == 'p':
if currentBranch == 'normal':
idx_b1, idx_b2 = 0, 1
elif currentBranch == 'advanced':
idx_b1, idx_b2 = 2, 3
elif currentBranch == 'master':
idx_b1, idx_b2 = 4, 5
measureFumen['branchInfo'][idx_b1] = int(total_notes_branch * measureTJA['branchStart'][1] * 20)
measureFumen['branchInfo'][idx_b2] = int(total_notes_branch * measureTJA['branchStart'][2] * 20)
val1 = int(total_notes_branch * measureTJA['branchStart'][1] * 20)
val2 = int(total_notes_branch * measureTJA['branchStart'][2] * 20)
elif measureTJA['branchStart'][0] == 'r':
measureFumen['branchInfo'] = measureTJA['branchStart'][1:] * 3
val1, val2 = measureTJA['branchStart'][1:]
# Determine which bytes to assign the values to
if currentBranch == 'normal':
idx_b1, idx_b2 = 0, 1
elif currentBranch == 'advanced':
idx_b1, idx_b2 = 2, 3
elif currentBranch == 'master':
idx_b1, idx_b2 = 4, 5
# Assign the values to their intended bytes
measureFumen['branchInfo'][idx_b1] = val1
measureFumen['branchInfo'][idx_b2] = val2
# Reset the note counter corresponding to this branch
total_notes_branch = 0
total_notes_branch += note_counter_branch