575 lines
12 KiB
Markdown
575 lines
12 KiB
Markdown
# new Furnace instrument format
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the main issue with Furnace instrument files is that they are too big, even if the instrument is nothing more than the FM setup...
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the aim of this new format is to greatly reduce the size of a resulting instrument.
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# information
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this format is "featural", meaning that only used parameters are stored (depending on instrument types).
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this is the biggest improvement over the previous format, which stored everything including unused parameters.
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features which are not recognized by Furnace will be ignored.
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instruments are not compressed using zlib, unlike Furnace songs.
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all numbers are little-endian.
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the following fields may be found in "size":
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- `f` indicates a floating point number.
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- `STR` is a UTF-8 zero-terminated string.
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- `???` is an array of variable size.
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- `S??` is an array of `STR`s.
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- `1??` is an array of bytes.
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- `2??` is an array of shorts.
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- `4??` is an array of ints.
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the format may change across versions. a `(>=VER)` indicates this field is only present starting from format version `VER`, and `(<VER)` indicates this field is present only before version `VER`.
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furthermore, an `or reserved` indicates this field is always present, but is reserved when the version condition is not met.
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the `size of this block` fields represent the size of a block excluding the ID and the aforementioned field.
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# header
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.fui files use the following header:
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```
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size | description
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-----|------------------------------------
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4 | "FINS" format magic
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2 | format version
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2 | instrument type
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??? | features...
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```
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instruments in a .fur file use the following header instead:
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```
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size | description
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-----|------------------------------------
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4 | "INS2" block ID
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4 | size of this block
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2 | format version
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2 | instrument type
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??? | features...
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```
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a feature uses the following format:
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```
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size | description
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-----|------------------------------------
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2 | feature code
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2 | length of block
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??? | data...
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```
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the following instrument types are available:
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- 0: SN76489
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- 1: FM (OPN)
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- 2: Game Boy
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- 3: C64
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- 4: Amiga/sample
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- 5: PC Engine
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- 6: AY-3-8910
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- 7: AY8930
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- 8: TIA
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- 9: SAA1099
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- 10: VIC
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- 11: PET
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- 12: VRC6
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- 13: OPLL
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- 14: OPL
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- 15: FDS
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- 16: Virtual Boy
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- 17: Namco 163
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- 18: SCC
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- 19: OPZ
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- 20: POKEY
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- 21: PC Speaker
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- 22: WonderSwan
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- 23: Lynx
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- 24: VERA
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- 25: X1-010
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- 26: VRC6 (saw)
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- 27: ES5506
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- 28: MultiPCM
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- 29: SNES
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- 30: Sound Unit
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- 31: Namco WSG
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- 32: OPL (drums)
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- 33: FM (OPM)
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- 34: NES
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- 35: MSM6258
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- 36: MSM6295
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- 37: ADPCM-A
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- 38: ADPCM-B
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- 39: SegaPCM
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- 40: QSound
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- 41: YMZ280B
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- 42: RF5C68
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- 43: MSM5232
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- 44: T6W28
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- 45: K007232
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- 46: GA20
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- 47: Pokémon Mini
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the following feature codes are recognized:
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- `NA`: instrument name
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- `FM`: FM ins data
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- `MA`: macro data
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- `64`: C64 ins data
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- `GB`: Game Boy ins data
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- `SM`: sample ins data
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- `O1`: operator 1 macros
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- `O2`: operator 2 macros
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- `O3`: operator 3 macros
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- `O4`: operator 4 macros
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- `LD`: OPL drums mode data
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- `SN`: SNES ins data
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- `N1`: Namco 163 ins data
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- `FD`: FDS/Virtual Boy ins data
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- `WS`: wavetable synth data
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- `SL`: list of samples
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- `WL`: list of wavetables
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- `MP`: MultiPCM ins data
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- `SU`: Sound Unit ins data
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- `ES`: ES5506 ins data
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- `X1`: X1-010 ins data
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- `EN`: end of features
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- if you find this feature code, stop reading the instrument.
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- it will usually appear only when there sample/wave lists.
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- instruments in a .fur shall end with this feature code.
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# instrument name (NA)
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```
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size | description
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-----|------------------------------------
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STR | instrument name
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```
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# FM data (FM)
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- FM operator order is:
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- 1/3/2/4 (internal order) for OPN, OPM, OPZ and OPL 4-op
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- 1/2/?/? (? = unused) for OPL 2-op and OPLL
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```
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size | description
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-----|------------------------------------
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1 | flags
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| - bit 4-7: op enabled
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| - op order from 4 to 7: 0, 2, 1, 3
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| - 2-op instruments: 0, 1, x, x
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| - bit 0-3: op count
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-----|------------------------------------
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| **base data**
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| /7 6 5 4 3 2 1 0|
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1 | |x| ALG |x| FB |
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1 | |FMS2 |AMS| FMS |
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1 | |AM2|4| LLPatch |
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-----|------------------------------------
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| **operator data × opCount**
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| /7 6 5 4 3 2 1 0|
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1 | |r| D T | MULT |
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| \- KSR
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1 | |s| T L |
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| \- SUS
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1 | |R S|v| A R |
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| \- VIB
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1 | |A|KSL| D R |
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| \- AM
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1 | |e|KVS| D2R |
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| \- EGT
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1 | | S L | R R |
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1 | | DVB | SSG |
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1 | | DAM |DT2| W S |
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```
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# macro data (MA)
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notes:
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- the macro range varies depending on the instrument type.
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- "macro open" indicates whether the macro is collapsed or not in the instrument editor.
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- meaning of extended macros varies depending on instrument type.
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- meaning of panning macros varies depending on instrument type:
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- for hard-panned chips (e.g. FM and Game Boy): left panning is 2-bit panning macro (left/right)
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- otherwise both left and right panning macros are used
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```
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size | description
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-----|------------------------------------
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2 | length of macro header
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??? | data...
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```
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each macro is represented like this:
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```
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size | description
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-----|------------------------------------
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1 | macro code
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| - 0: vol
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| - 1: arp
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| - 2: duty
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| - 3: wave
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| - 4: pitch
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| - 5: ex1
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| - 6: ex2
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| - 7: ex3
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| - 8: alg
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| - 9: fb
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| - 10: fms
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| - 11: ams
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| - 12: panL
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| - 13: panR
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| - 14: phaseReset
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| - 15: ex4
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| - 16: ex5
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| - 17: ex6
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| - 18: ex7
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| - 19: ex8
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| - 255: stop reading and move on
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1 | macro length
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1 | macro loop
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1 | macro release
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1 | macro mode
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1 | macro open/type/word size
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| - bit 6-7: word size
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| - 0: 8-bit unsigned
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| - 1: 8-bit signed
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| - 2: 16-bit signed
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| - 3: 32-bit signed
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| - bit 1-2: type
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| - 0: normal
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| - 1: ADSR
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| - 2: LFO
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| - bit 0: open
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1 | macro delay
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1 | macro speed
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??? | macro data
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| - length: macro length × word sizs
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```
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## interpreting macro mode values
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- sequence (normal): I think this is obvious...
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- ADSR:
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- `val[0]`: bottom
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- `val[1]`: top
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- `val[2]`: attack
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- `val[3]`: hold time
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- `val[4]`: decay
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- `val[5]`: sustain level
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- `val[6]`: sustain hold time
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- `val[7]`: decay 2
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- `val[8]`: release
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- LFO:
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- `val[11]`: speed
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- `val[12]`: waveform
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- 0: triangle
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- 1: saw
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- 2: pulse
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- `val[13]`: phase
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- `val[14]`: loop
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- `val[15]`: global (not sure how will I implement this)
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# C64 data (64)
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```
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size | description
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-----|------------------------------------
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1 | flags 1
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| - bit 7: dutyIsAbs
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| - bit 6: initFilter
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| - bit 5: volIsCutoff
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| - bit 4: toFilter
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| - bit 3: noise on
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| - bit 2: pulse on
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| - bit 1: saw on
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| - bit 0: triangle on
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1 | flags 2
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| - bit 7: oscSync
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| - bit 6: ringMod
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| - bit 5: noTest
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| - bit 4: filterIsAbs
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| - bit 3: ch3off
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| - bit 2: band pass
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| - bit 1: high pass
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| - bit 0: low pass
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1 | attack/decay
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| - bit 4-7: attack
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| - bit 0-3: decay
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1 | sustain release
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| - bit 4-7: sustain
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| - bit 0-3: release
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2 | duty
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2 | cutoff/resonance
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| - bit 12-15: resonance
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| - bit 0-10: cutoff
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```
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# Game Boy data (GB)
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```
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size | description
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-----|------------------------------------
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1 | envelope params
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| - bit 5-7: length
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| - bit 4: direction
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| - bit 0-3: volume
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1 | sound length
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| - 64 is infinity
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1 | flags
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| - bit 1: always init envelope
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| - bit 0: software envelope (zombie mode)
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1 | hardware sequence length
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??? | hardware sequence...
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| - length: 3*hwSeqLen
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```
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a value in the hardware sequence has the following format:
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```
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size | description
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-----|------------------------------------
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1 | command
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| - 0: set envelope
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| - 1: set sweep
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| - 2: wait
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| - 3: wait for release
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| - 4: loop
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| - 5: loop until release
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2 | data
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| - for set envelope:
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| - 1 byte: parameter
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| - bit 4-7: volume
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| - bit 3: direction
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| - bit 0-2: length
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| - 1 byte: sound length
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| - for set sweep:
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| - 1 byte: parameter
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| - bit 4-6: length
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| - bit 3: direction
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| - bit 0-2: shift
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| - 1 byte: nothing
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| - for wait:
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| - 1 byte: length (in ticks)
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| - 1 byte: nothing
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| - for wait for release:
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| - 2 bytes: nothing
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| - for loop/loop until release:
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| - 2 bytes: position
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```
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# sample ins data (SM)
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```
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size | description
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-----|------------------------------------
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2 | initial sample
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1 | flags
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| - bit 2: use wave
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| - bit 1: use sample
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| - bit 0: use sample map
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1 | waveform length
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4?? | sample map... (120 entries)
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| - only read if sample map is enabled
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```
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the sample map format:
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```
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size | description
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-----|------------------------------------
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2 | note to play
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2 | sample to play
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```
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# operator macro data (O1, O2, O3 and O4)
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similar to macro data, but using these macro codes:
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- 0: AM
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- 1: AR
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- 2: DR
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- 3: MULT
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- 4: RR
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- 5: SL
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- 6: TL
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- 7: DT2
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- 8: RS
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- 9: DT
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- 10: D2R
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- 11: SSG-EG
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- 12: DAM
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- 13: DVB
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- 14: EGT
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- 15: KSL
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- 16: SUS
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- 17: VIB
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- 18: WS
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- 19: KSR
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# OPL drums mode data (LD)
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```
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size | description
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-----|------------------------------------
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1 | fixed frequency mode
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2 | kick freq
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2 | snare/hat freq
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2 | tom/top freq
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```
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# SNES data (SN)
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```
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size | description
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-----|------------------------------------
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1 | attack/decay
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| - bit 4-6: decay
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| - bit 0-3: attack
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1 | sustain/release
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| - bit 5-7: sustain
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| - bit 0-4: release
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1 | flags
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| - bit 4: envelope on
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| - bit 3: make sustain effective (<131)
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| - bit 0-2: gain mode
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| - 0: direct
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| - 4: dec
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| - 5: exp
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| - 6: inc
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| - 7: bent
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1 | gain
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1 | decay 2/sustain mode (>=131)
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| - bit 5-6: sustain mode
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| - 0: direct
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| - 1: sustain (release with dec)
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| - 2: sustain (release with exp)
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| - 3: sustain (release with rel)
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| - bit 0-4: decay 2
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```
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# Namco 163 data (N1)
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```
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size | description
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-----|------------------------------------
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4 | waveform
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1 | wave pos
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1 | wave len
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1 | wave mode
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```
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# FDS/Virtual Boy data (FD)
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```
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size | description
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-----|------------------------------------
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4 | mod speed
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4 | mod depth
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1 | init mod table with first wave
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1?? | modulation table (32 entries)
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```
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# wavetable synth data (WS)
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```
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size | description
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-----|------------------------------------
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4 | first wave
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4 | second wave
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1 | rate divider
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1 | effect
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| - bit 7: single or dual effect
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1 | enabled
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1 | global
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1 | speed (+1)
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1 | parameter 1
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1 | parameter 2
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1 | parameter 3
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1 | parameter 4
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```
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# list of samples (SL)
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```
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size | description
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-----|------------------------------------
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1 | number of samples
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1?? | sample indexes...
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4?? | pointers to samples...
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| - these use the Furnace sample format.
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```
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# list of wavetables (WL)
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```
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size | description
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-----|------------------------------------
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1 | number of wavetables
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1?? | wavetable indexes...
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4?? | pointers to wavetables...
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| - these use the Furnace wavetable format.
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```
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# MultiPCM data (MP)
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```
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size | description
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-----|------------------------------------
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1 | attack rate
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1 | decay 1 rate
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1 | decay level
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1 | decay 2 rate
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1 | release rate
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1 | rate correction
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1 | LFO rate
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1 | vibrato depth
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1 | AM depth
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```
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# Sound Unit data (SU)
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```
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size | description
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-----|------------------------------------
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1 | switch roles of phase reset timer and frequency
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```
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# ES5506 data (ES)
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```
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size | description
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-----|------------------------------------
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1 | filter mode
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| - 0: HPK2_HPK2
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| - 1: HPK2_LPK1
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| - 2: LPK2_LPK2
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| - 3: LPK2_LPK1
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2 | K1
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2 | K2
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2 | envelope count
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1 | left volume ramp
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1 | right volume ramp
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1 | K1 ramp
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1 | K2 ramp
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1 | K1 slow
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1 | K2 slow
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```
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# X1-010 data (X1)
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```
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size | description
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-----|------------------------------------
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4 | bank slot
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```
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