possible new Furnace instrument format

the main issue with Furnace instrument files is that they are too big, even if the instrument is nothing more than the FM setup...

the aim of this new format is to greatly reduce the size of a resulting instrument.

size | description
-----|------------------------------------
  6  | "FURINS" format magic
  2  | format version
  1  | instrument type
 ??? | feature bits
  4  | instrument length (if wave/sample bits are on)

the "feature bits" field is a variable length bitfield. bit 7 in a byte indicates "read one more byte".

the feature bits are:

0: has wavetables
1: has samples
2: has name
3: FM data
4: FM data size (1: 2-op, 0: 4-op)
5: FM data includes OPL/OPZ data
- if off, only read an op until ssgEnv.
- if on, read everything else.
6: Game Boy data
7: (continue in next byte)
8: C64 data
9: Amiga data
10: standard data (macros)
11: operator macros
12: release points
13: op release points
14: extended op macros
15: (continue in next byte)
16: OPL drums mode data
17: Amiga sample map data
18: Namco 163 data
19: extra macros
20: FDS data
21: OPZ data
22: wavetable synth data
23: (continue in next byte)
24: additional macro modes
25: extra C64 data
26: MultiPCM data

1.3 KiB Raw Blame History

possible new Furnace instrument format

1.3 KiB

Raw Blame History