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Format name
: Noisepacker v2
Created by : Twins / Phenomena (1990)
Sources :
* the original packer sent by Gryzor !!!.
* tons of intros/demos/musicdisks ...
It's the very same as NoisePacker v1 save for
the loop start value which is, here, /2. Also, maybe something around
Set filter effect .. not sure, though
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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 / 2
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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 set filter command (E0) is changed (E02 -> E01)
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 : (NP2)
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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