| |
Format name
: Tracker Packer v2
Created by : Crazy Crack / MEXX (1993-1994)
Sources :
* Three TP2 file sent by Gryzor (thx !)
Note : Lots of new features, regarding the previous version which was rather
good already !. The packing of the notes is one of the best I've seen
so far as now. Really great packer ... though, I think Heatseeker is
still better :)
|
OFFSET
|
SIZE (bytes)
|
COMMENT
|
|
0
8
1Ch
-
-
|
8
14h
4
-
-
|
- ID "MEXX_TP2"
- title
- (NOS) Number of sample (*8). Also, that's the size of the whole
sample headers |
The following is repeated NOS times
with 8 bytes description for one sample
|
1Eh
1Fh
20h
22h
24h
|
1
1
2
2
2
|
- Finetune (0 -> F)
- Volume (0 - 40h)
- Sample Size / 2
- Loop Start / 2
- Loop Size / 2
|
|
1Eh+8*NOS
1Fh+8*NOS
20h+8*NOS
-
20h+8*NOS
+ PLS*2
-
-
-
-
-
-
-
-
20h+8*NOS
PLS*2
+NOP*8
22h+8*NOS
PLS*2
+NOP*8
-
-
-
-
|
1
1
PLS*2
-
NOP*8
-
-
-
-
-
-
-
-
-
2
-
-
?!?
-
-
-
-
-
-
|
- ?!? ($00)
- (PLS) Pattern list size
- The pattern list. Each number of pattern is *8 !
- (NOP stands for the REAL number of pattern which value is known
by getting the highest value in the previous table and by adding
1 since the first is 0) Track table per pattern. Each SAVED pattern
is made of 4 tracks and here are the addresses of each track. This
is a table of words. The first address is $0000!. To get the real
track address, add to the present value : (34+8*NOS+2*PLS+NOP*8)
- ?!?
-
-
- Tracks datas. Each track is saved one after another. It consists
of 64 possible notes. the size of each track is variable and is
between 1 byte and 300h bytes. Here follows the whole lot of cases
one can find in the track data (the note packing) |
Note Packing :
* case 1 :
value
/ \
| |
1100-0000
||
if these bits are set, you have to bypass (80h-value) bytes
for those are empty notes
|
* case 2 :
-description bit set to 0
/
|
1000-0000 0000-0000
| | | | |
| \ / \ /
| effect effect value
\
-description bit set to 1
|
* case 3 (No effect):
0000-0000 0000-0000
|| | | | |
/ \ / \ / \/
| relative sample effect
| note number
| number
|------------description bit set to 0
Note: effect, here, is EMPTY !
|
* case 4:
0000-0000 0000-0000 0000-0000
|| | | | | | |
/ \ / \ / \/ \ /
| relative sample effect effect
| note number value
| number
|------------description bit set to 0
|
the first bit of 'relative note number' and the last of 'sample number'
are the same but can only be used by the sample number because the note
value is even ... thus, its first bit is never used
For all those cases:
the arpeggio (0) effect has been remapped to 8
Note that all the volume slide commands (5,6,A) are signed !. Here
an example: A 01 -> A 10 or A FF -> A 01 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
|
become : (TP2)
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
|
Follow Sample datas stored
like Protracker. Nothing is packed..
|
|
