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utils.py: Add difficulty-based investigation notes

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Viv 2023-06-02 16:33:47 -04:00
parent 60fb3215d7
commit 1d3490c600
1 changed files with 29 additions and 16 deletions
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tja2fumen/utils.py
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@ -64,27 +64,40 @@ def validateHeaderMetadata(headerBytes):
elif idx == 9:
assert val in [27, 31, 23], f"Expected 27/31/23 at position '{idx}', got '{val}' instead."
# 3. TODO
# 3. TODO: Note count / drumroll count / note score / song length / etc.
# Notes:
# * Byte 12 has a bell-curve distribution from 0-255, with most bytes clustered in the 31-63 range.
# - Because of the distribution of values, this byte feels like a song property.
# - e.g. easy songs have a lower value, harder songs have a higher value
# * Byte 13 is usually just 0, but for some games, it can be 1 or 2.
# - For Oni songs, bytes (12, 16, 20) correlate with note count (bytes 13, 17 are always 0):
# * If we look at 10* Oni songs, we see the following 2 ends of the spectrum for bytes (12, 13, 16, 17, 20):
# - (9, 0, 4, 0, 238): Sotsu Omeshii Full (1487 notes)
# - (9, 0, 5, 0, 237): Shimedore 2000 (1414 notes)
# Shimedore 2000+ (1414 notes)
# Silent Jealousy (1408 notes)
# The Future of the Taiko Drum (1400 notes)
# Dairouketen Maou (1396 notes)
# - (10, 0, 5, 0, 235): Yugen no Ran (1262 notes)
# - [...]
# - (27, 0, 14, 0, 201): Pan vs. Gohan! Daikessen! [Normal Route] (480 notes)
# - (28, 0, 14, 0, 200): Anata to Tu-lat-tat-ta (468 notes)
# - (34, 0, 17, 0, 189): GeGeGe no Kitaro [6th Season] (390 notes)
# * Just to confirm, if we look at the top/bottom 9* songs, we see:
# - (8, 0, 4, 0, 240): Hypnosismic -Division Battle Anthem- (1608 notes)
# - (10, 0, 8, 0, 225): Rokuchounen to Ichiyo Monogatari (846 notes)
# - (48, 0, 24, 0, 160): Inscrutable Battle (274 notes)
# * So, to summarize, for Oni songs:
# - As the number of notes increases, bytes 12/16 decrease, and byte 20 increases
# - As the number of notes decreases, bytes 12/16 increase, and byte 20 decreases
#
# - However, the relationship doesn't hold when checking, for example, 1* Easy charts
# * Bytes 13 and 17, which were previously always 0, are now 0/1/2:
# - (249, 0, 187, 0, 132): Let's go! Smile Precure (67 notes)
# - (249, 1, 123, 1, 3): Anata to Tu-lat-tat-ta (33 notes)
# - (44, 2, 161, 1, 234): Do you want to build a Snowman? (30 notes)
# - (0, 1, 192, 0, 128): Odoru Ponpokorin (65 notes)
# * I'm having trouble making sense of the relationships between these bytes.
elif idx in [12, 13]:
pass
# 4. TODO
# Notes:
# * Byte 16 has a bell-curve distribution from 0-255, with most bytes clustered in the 7-24 range.
# - Because of the distribution of values, this byte feels like a song property.
# - e.g. easy songs have a lower value, harder songs have a higher value
# * Byte 17 is usually just 0, but for some games, it can be 1 or 2.
elif idx in [16, 17]:
pass
# 5. TODO
# Notes:
# * Byte 20 has a bell-curve distribution from 1-242, with most bytes clustered in the 164-230 range
elif idx == 20:
pass