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Format
name : Noisepacker v1
Created by : Twins / Phenomena (1990)
Sources :
* Own converted musics with the packer (bugged btw ..).
* two NP1 packed files sent by Gryzor
! (thx)
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OFFSET
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SIZE (bytes)
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COMMENT
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0
2
4
6
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2
2
2
2
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- Number of sample + $C
- Size of pattern list (/2 to get real size)
- ?!?
- track data size
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The following is repeated NOS times
with 16 bytes description for one sample
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8
Ch
Eh
Fh
10h
14h
16h
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4
2
1
1
4
2
2
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- ?!? (looks like it's always four 00h ...)
- Sample Size / 2
- Finetune (0 -> F) (U sure gryzor ???)
- Volume (0->40h)
- ?!? (looks like it's always four 00h ...)
- Loop Size / 2
- Loop Start
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?!?
?!?
?!?
?!?
-
-
-
-
-
-
-
-
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2
2
?!?
?!?
-
-
-
-
-
-
-
-
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- Size of pattern list (again !?)
- ?!?
- Pattern list (words) (*8)
- Track list per pattern. 2 bytes for one track address and then,
8 bytes for one pattern. Since the track datas begin right after,
you have to add TDA (track data address). This TDA is the number
of bytes you'll have read AFTER this list. You can calculate it
if you want ... that way: 8 + (NumberOfSample*16) + 4 + (PatternListSize*2)
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Beware because this list is reversed !. Meaning that one pattern first
contains the address of its track 4, then of track 3 ...
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TDA
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?!?
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- Track datas. Each track is saved
after another and is 192 (C0h) bytes long |
Each track consists of 64 notes, 3 bytes each
Note Packing :
sample number
/ \
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0000 0000 0000 0000 0000 0000
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\ / \/ \ /
relative effect effect
note nbr parameter
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About 'relative note number', in fact, all
the 8 bits are used but I pictured only the last 7 ones to show the
use of the first bit by the sample number. The correct value for this
note number can be obtained like that : Byte&FEh. Below is the complete
table and you can see that all the value are *2 ... so first bit is
never used
The Arpeggio effect is remapped to the effect number #8.
The Volume slide effect is remapped to the effect number #7 BUT with
signed value !! (7FE -> A01). Now, don't forget to place correctly
the slide up ... so when converting just donc forget to <<4 !
(704 -> A40)
The Vibrato + Volume slide effect (6) is signed !. So, same as
volume slide : 6FA -> 606 and 604 -> 640
The Portamento + Volume slide effect (5) is signed !. So, same as
volume slide : 5FA -> 506 and 504 -> 540
The pattern jump 'seems' to be *2 and starts at FC !. So jump to
pattern 0 is BFC, to pattern 1 BFE, to pattern 2 B00 etc. ...
relative note number: (Protracker)
C-1 to B-1 : 856,808,762,720,678,640,604,570,538,508,480,453
C-2 to B-2 : 428,404,381,360,339,320,302,285,269,254,240,226
C-3 to B-3 : 214,202,190,180,170,160,151,143,135,127,120,113
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becomes : (NP1)
C-1 to B-1 : 02,04,06,08,0a,0c,0e,10,12,14,16,18
C-2 to B-2 : 1a,1c,1e,20,22,24,26,28,2a,2c,2e,30
C-3 to B-3 : 32,34,36,38,3a,3c,3e,40,42,44,46,48
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Follow Sample datas stored like Protracker.
Nothing is packed..
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