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Question re .OSR file format

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Darkimmortal
264 posts
Joined May 2008
Topic Starter
Darkimmortal
Quick question for a project I'm working on:

From a .osr file, how can I determine the ID and/or author of the beatmap? Basically I need a way of identifying which beatmap goes with a .osr file, in a way that accounts for song artist/title conflicts.

Also, it would be beneficial to know where I can determine the difficulty name besides the filename, but that's probably not essential
Last edited by Darkimmortal , edited 1 time in total.
Darkimmortal
264 posts
Joined May 2008
Topic Starter
Darkimmortal
Still interested in a way of doing what I first mentioned (though I found a workaround), but now I really need a way to determine a replay's length in milliseconds

Edit: Disregard it was staring me in the face :P
XinCrin
2,846 posts
Joined January 2012
XinCrin
Nope , i don't like
Darkimmortal
264 posts
Joined May 2008
Topic Starter
Darkimmortal
Only thing I'm lacking now is a way to determine if a replay has a modified length (i.e. nightcore/doubletime) - where are the mod flags stored in the osr file?

At first I thought it was the 2nd byte, but now I'm not sure
statementreply
Pro Tester
307 posts
Joined June 2009
statementreply
My guesses:
SPOILER
Replay file
00000000h: 00                                              ; .
Game mode: 00: osu! standard, 01: taiko, 02: ctb, 03: osu!mania
00000001h: 18 06 33 01                                     ; ..3.
File format version or something like this
00000005h: 0B 20 34 65 63 61 65 33 61 30 31 33 33 35 33 64 ; . 4ecae3a013353d
00000015h: 33 39 63 37 64 31 33 33 32 62 32 30 36 31 65 62 ; 39c7d1332b2061eb
00000025h: 39 61                                           ; 9a
0x0B
Chunk length in ULEB128
MD5 of .osu file
00000027h: 0B 0E 73 74 61 74 65 6D 65 6E 74 72 65 70 6C 79 ; ..statementreply
0x0B
Chunk length in ULEB128
Player
00000037h: 0B 20 66 31 63 64 63 62 65 63 37 34 35 35 31 62 ; . f1cdcbec74551b
00000047h: 65 32 36 34 36 65 66 38 35 62 61 33 65 64 61 66 ; e2646ef85ba3edaf
00000057h: 64 36                                           ; d6
0x0B
Chunk length in ULEB128
MD5 of something derived from replay
00000059h: D9 00                                           ; ..
300
0000005bh: 00 00                                           ; ..
100 (taiko: 150, osu!mania: 200)
0000005dh: 00 00                                           ; ..
50
0000005fh: 2D 00                                           ; -.
Geki (osu!mania: MAX)
00000061h: 00 00                                           ; ..
Katu (osu!mania: 100)
00000063h: 00 00                                           ; ..
Miss
00000065h: 73 7E 20 00                                     ; s~ .
Total score
00000069h: 7B 01                                           ; {.
Max combo
0000006bh: 01                                              ; .
Perfect or not
0000006ch: 2C 40 00 00                                     ; ,@..
Mods:
0x1: No fail
0x2: Easy
0x4: No video
0x8: Hidden
0x10: Hard rock
0x20: Sudden death
0x40: Double time
0x80: Relax
0x100: Half time
0x200: Nightcore (Nightcore = 0x0240 = Nightcore + Double time)
0x400: Flashlight
0x800: Auto
0x1000: Spun out
0x2000: Auto pilot
0x4000: Perfect (Perfect = 0x4020 = Perfect + No fail)
0x8000: 4K
0x10000: 5K
0x20000: 6K
0x40000: 7K
0x80000: 8K
00000070h: 0B DC 02 31 34 33 37 30 7C 31 2C 31 36 36 32 31 ; ...14370|1,16621
00000080h: 7C 31 2C 31 38 36 38 31 7C 31 2C 32 31 31 31 39 ; |1,18681|1,21119
00000090h: 7C 31 2C 32 33 33 37 31 7C 31 2C 32 35 36 32 32 ; |1,23371|1,25622
000000a0h: 7C 31 2C 32 37 38 36 39 7C 31 2C 33 30 31 32 31 ; |1,27869|1,30121
000000b0h: 7C 31 2C 33 32 33 37 30 7C 31 2C 33 34 36 32 30 ; |1,32370|1,34620
000000c0h: 7C 31 2C 33 37 32 34 38 7C 31 2C 33 39 32 38 34 ; |1,37248|1,39284
000000d0h: 7C 31 2C 34 31 33 37 30 7C 31 2C 34 33 36 32 30 ; |1,41370|1,43620
000000e0h: 7C 31 2C 34 35 38 37 30 7C 31 2C 34 38 31 32 30 ; |1,45870|1,48120
000000f0h: 7C 31 2C 35 30 31 36 38 7C 31 2C 35 32 34 33 33 ; |1,50168|1,52433
00000100h: 7C 31 2C 35 34 36 38 33 7C 31 2C 35 36 37 33 34 ; |1,54683|1,56734
00000110h: 7C 31 2C 35 38 38 30 37 7C 31 2C 36 30 38 37 30 ; |1,58807|1,60870
00000120h: 7C 31 2C 36 32 39 33 31 7C 31 2C 36 35 31 38 31 ; |1,62931|1,65181
00000130h: 7C 31 2C 36 37 34 33 34 7C 31 2C 36 39 38 36 39 ; |1,67434|1,69869
00000140h: 7C 31 2C 37 32 31 32 30 7C 31 2C 37 34 31 37 35 ; |1,72120|1,74175
00000150h: 7C 31 2C 37 36 32 34 35 7C 31 2C 37 38 33 30 35 ; |1,76245|1,78305
00000160h: 7C 31 2C 38 30 33 37 30 7C 31 2C 38 32 38 30 38 ; |1,80370|1,82808
00000170h: 7C 31 2C 38 34 38 37 31 7C 31 2C 38 36 39 33 32 ; |1,84871|1,86932
00000180h: 7C 31 2C 38 39 31 38 33 7C 31 2C 39 31 38 30 36 ; |1,89183|1,91806
00000190h: 7C 31 2C 39 33 38 37 30 7C 31 2C 39 35 39 33 32 ; |1,93870|1,95932
000001a0h: 7C 31 2C 39 38 33 37 31 7C 31 2C 31 30 30 34 31 ; |1,98371|1,10041
000001b0h: 39 7C 31 2C 31 30 32 38 37 30 7C 31 2C 31 30 35 ; 9|1,102870|1,105
000001c0h: 30 32 37 7C 31 2C 31 30 36 38 30 37 7C 31 2C    ; 027|1,106807|1,
0x0B
Chunk length in ULEB128
HP vs. time graph
000001cfh: 32 5F 87 9C F0 8E CF 08                         ; 2_......
Date/time

EDIT: Fixed typo
EDIT2: VLQ ULEB128
Last edited by statementreply , edited 4 times in total.
Darkimmortal
264 posts
Joined May 2008
Topic Starter
Darkimmortal

statementreply wrote:

My guesses:
SPOILER
Replay file
00000000h: 00                                              ; .
Game mode: 00: osu! standard, 01: taiko, 02: ctb, 03: osu!mania
00000001h: 18 06 33 01                                     ; ..3.
File format version or something like this
00000005h: 0B 20 34 65 63 61 65 33 61 30 31 33 33 35 33 64 ; . 4ecae3a013353d
00000015h: 33 39 63 37 64 31 33 33 32 62 32 30 36 31 65 62 ; 39c7d1332b2061eb
00000025h: 39 61                                           ; 9a
0x0B
Chunk length in VLQ
MD5 of .osu fies
00000027h: 0B 0E 73 74 61 74 65 6D 65 6E 74 72 65 70 6C 79 ; ..statementreply
0x0B
Chunk length in VLQ
Player
00000037h: 0B 20 66 31 63 64 63 62 65 63 37 34 35 35 31 62 ; . f1cdcbec74551b
00000047h: 65 32 36 34 36 65 66 38 35 62 61 33 65 64 61 66 ; e2646ef85ba3edaf
00000057h: 64 36                                           ; d6
0x0B
Chunk length in VLQ
MD5 of something derived from replay
00000059h: D9 00                                           ; ..
300
0000005bh: 00 00                                           ; ..
100 (taiko: 150, osu!mania: 200)
0000005dh: 00 00                                           ; ..
50
0000005fh: 2D 00                                           ; -.
Geki (osu!mania: MAX)
00000061h: 00 00                                           ; ..
Katu (osu!mania: 100)
00000063h: 00 00                                           ; ..
Miss
00000065h: 73 7E 20 00                                     ; s~ .
Total score
00000069h: 7B 01                                           ; {.
Max combo
0000006bh: 01                                              ; .
Perfect or not
0000006ch: 2C 40 00 00                                     ; ,@..
Mods:
0x1: No fail
0x2: Easy
0x4: No video
0x8: Hidden
0x10: Hard rock
0x20: Sudden death
0x40: Double time
0x80: Relax
0x100: Half time
0x200: Nightcore (Nightcore = 0x0240 = Nightcore + Double time)
0x400: Flashlight
0x800: Auto
0x1000: Spun out
0x2000: Auto pilot
0x4000: Perfect (Perfect = 0x4020 = Perfect + No fail)
0x8000: 4K
0x10000: 5K
0x20000: 6K
0x40000: 7K
0x80000: 8K
00000070h: 0B DC 02 31 34 33 37 30 7C 31 2C 31 36 36 32 31 ; ...14370|1,16621
00000080h: 7C 31 2C 31 38 36 38 31 7C 31 2C 32 31 31 31 39 ; |1,18681|1,21119
00000090h: 7C 31 2C 32 33 33 37 31 7C 31 2C 32 35 36 32 32 ; |1,23371|1,25622
000000a0h: 7C 31 2C 32 37 38 36 39 7C 31 2C 33 30 31 32 31 ; |1,27869|1,30121
000000b0h: 7C 31 2C 33 32 33 37 30 7C 31 2C 33 34 36 32 30 ; |1,32370|1,34620
000000c0h: 7C 31 2C 33 37 32 34 38 7C 31 2C 33 39 32 38 34 ; |1,37248|1,39284
000000d0h: 7C 31 2C 34 31 33 37 30 7C 31 2C 34 33 36 32 30 ; |1,41370|1,43620
000000e0h: 7C 31 2C 34 35 38 37 30 7C 31 2C 34 38 31 32 30 ; |1,45870|1,48120
000000f0h: 7C 31 2C 35 30 31 36 38 7C 31 2C 35 32 34 33 33 ; |1,50168|1,52433
00000100h: 7C 31 2C 35 34 36 38 33 7C 31 2C 35 36 37 33 34 ; |1,54683|1,56734
00000110h: 7C 31 2C 35 38 38 30 37 7C 31 2C 36 30 38 37 30 ; |1,58807|1,60870
00000120h: 7C 31 2C 36 32 39 33 31 7C 31 2C 36 35 31 38 31 ; |1,62931|1,65181
00000130h: 7C 31 2C 36 37 34 33 34 7C 31 2C 36 39 38 36 39 ; |1,67434|1,69869
00000140h: 7C 31 2C 37 32 31 32 30 7C 31 2C 37 34 31 37 35 ; |1,72120|1,74175
00000150h: 7C 31 2C 37 36 32 34 35 7C 31 2C 37 38 33 30 35 ; |1,76245|1,78305
00000160h: 7C 31 2C 38 30 33 37 30 7C 31 2C 38 32 38 30 38 ; |1,80370|1,82808
00000170h: 7C 31 2C 38 34 38 37 31 7C 31 2C 38 36 39 33 32 ; |1,84871|1,86932
00000180h: 7C 31 2C 38 39 31 38 33 7C 31 2C 39 31 38 30 36 ; |1,89183|1,91806
00000190h: 7C 31 2C 39 33 38 37 30 7C 31 2C 39 35 39 33 32 ; |1,93870|1,95932
000001a0h: 7C 31 2C 39 38 33 37 31 7C 31 2C 31 30 30 34 31 ; |1,98371|1,10041
000001b0h: 39 7C 31 2C 31 30 32 38 37 30 7C 31 2C 31 30 35 ; 9|1,102870|1,105
000001c0h: 30 32 37 7C 31 2C 31 30 36 38 30 37 7C 31 2C    ; 027|1,106807|1,
0x0B
Chunk length in VLQ
HP vs. time graph
000001cfh: 32 5F 87 9C F0 8E CF 08                         ; 2_......
Date/time

You're an absolute star. Thank you so much!!! :)

Wish old .osr files had the hp/time graph section that I've been using, will have to scrape the beatmap info webpage for map length.

(First MD5 can be used to lookup beatmap id and difficulty id amongst other things using the api that I'm sure you'll find in 5 seconds with wireshark)
statementreply
Pro Tester
307 posts
Joined June 2009
statementreply

Darkimmortal wrote:

Wish old .osr files had the hp/time graph section that I've been using, will have to scrape the beatmap info webpage for map length.
If the hp/time graph section is missing (eg. online replay downloaded), the whole 0x0B ... section would be 0x00 instead.
funnytrees
28 posts
Joined September 2012
funnytrees
Does anyone happen to know how the rest of the osr file format?
After the time stamp is an integer which tells the length of the data, and then the rest is all cryptic to me.
All I can tell is that the data is recorded by event.
Darkimmortal
264 posts
Joined May 2008
Topic Starter
Darkimmortal

funnytrees wrote:

Does anyone happen to know how the rest of the osr file format?
After the time stamp is an integer which tells the length of the data, and then the rest is all cryptic to me.
All I can tell is that the data is recorded by event.
It's a 7z stream or something iirc
funnytrees
28 posts
Joined September 2012
funnytrees
That seems right. I guess I'll read a more about it in the documentation files.

Thanks a bunch!
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