Amiga MOD Packers Described - FC-M Packer Described

Format name : FC-M Packer
Created by : ?

Sources :
* two FC-M packed files sent by Gryzor (thx !)

OFFSET	SIZE (bytes)	COMMENT
0 4 - 6 - Ah 1Eh - -	4 2 - 4 - 14 4 - -	- "FC-M" Id - ?!? ($0100) probably the version number of the packer .. . - "NAME" pseudo chunk ID indicating the title of the song follows - title of the song - "INST" pseudo chunk ID indicating the two following bytes a the descriptions of the samples

The following is repeated 31 times
with 8 bytes description for one sample

22h
24h
25h
26h
28h

2
1
1
2
2

- Sample size / 2
- Finetune (0->F)
- Volume (0->40h)
- Loop Start / 2
- Loop size / 2

11Ah
-
-
11Eh
11Fh
120h
-
124h
-
?!?
-
?!?

4
-
-
1
1
4
-
?!?
-
4
-
?!?

- "LONG" pseudo chunk ID indicating the following two bytes are the pattern list lenght and the ntk byte
- Size of pattern table
- Noisetracker byte ($7F)
- "PATT" pseudo chunk ID indicating the following bytes are the pattern list
- Pattern table. The lenght is written upward
- "SONG" pseudo chunk ID indicating the following bytes are the pattern data
- pattern data. Stored like Protracker

So, each note takes 4 bytes and is stored the same way as ptk :

        -note value
       /           \
      |             |                 
 0000 0000  0000 0000  0000 0000  0000 0000  
 |  |                  |  | |  |  |       |
  \  \                 / /   \/    \     /
   \--Sample number-----/  effect   effect
                                  parameter

?!?

- "SAMP" pseudo chunk ID indicating the following bytes are the sample data. ALL the sample data !!

Follow Sample datas stored like Protracker. Nothing is packed..