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5.8 KiB
5.8 KiB
the Furnace file format (.fur)
while Furnace works directly with the .dmf format, I had to create a new format to handle future additions to the program.
this document has the goal of detailing the format.
header
the header is 32 bytes long.
| size | description |
|---|---|
| 16 | "-Furnace module-" format magic |
| 2 | format version |
| - should be 17 for Furnace 0.4 | |
| 2 | reserved |
| 4 | song info pointer |
| 8 | reserved |
song info
| size | description |
|---|---|
| 4 | "INFO" block ID |
| 4 | reserved |
| 1 | time base |
| 1 | speed 1 |
| 1 | speed 2 |
| 1 | initial arpeggio time |
| 4f | ticks per second |
| - 60 is NTSC | |
| - 50 is PAL | |
| 2 | pattern length |
| 2 | orders length |
| 1 | highlight A |
| 1 | highlight B |
| 2 | instrument count |
| 2 | wavetable count |
| 2 | sample count |
| 4 | pattern count |
| 32 | list of sound chips |
| - possible soundchips: | |
| - 0x00: end of list | |
| - 0x01: YMU759 - 17 channels | |
| - 0x02: Genesis - 10 channels | |
| - 0x03: SMS (SN76489) - 4 channels | |
| - 0x04: Game Boy - 4 channels | |
| - 0x05: PC Engine - 6 channels | |
| - 0x06: NES - 5 channels | |
| - 0x07: C64 (8580) - 3 channels | |
| - 0x08: Arcade (YM2151) - 13 channels | |
| - 0x09: Neo Geo (YM2610) - 13 channels | |
| - bit 6 enables alternate mode: | |
| - 0x42: Genesis extended - 13 channels | |
| - 0x47: C64 (6581) - 3 channels | |
| - 0x49: Neo Geo extended - 16 channels | |
| - bit 7 for non-DefleMask chips: | |
| - 0x80: AY-3-8910 - 3 channels | |
| - 0x82: YM2151 alone - 8 channels | |
| - 0x83: YM2612 alone - 6 channels | |
| 32 | sound chip volumes |
| - signed char, 64=1.0, 127=~2.0 | |
| 32 | sound chip panning |
| - signed char, -128=left, 127=right | |
| 128 | sound chip parameters (TODO) |
| ??? | song name |
| ??? | song author |
| 24 | reserved for compatibility flags |
| 4?? | pointers to instruments |
| 4?? | pointers to wavetables |
| 4?? | pointers to samples |
| 4?? | pointers to patterns |
| ??? | orders |
| - a table of shorts | |
| - size=channels*ordLen | |
| - read orders than channels | |
| ??? | effect columns |
| - size=channels |
instrument
| size | description |
|---|---|
| 4 | "INST" block ID |
| 4 | reserved |
| 2 | format version (see header) |
| 1 | instrument type |
| - 0: standard | |
| - 1: FM | |
| - 2: Game Boy | |
| - 3: C64 | |
| - 4: Amiga/sample | |
| 1 | reserved |
| ??? | instrument name |
| --- | FM instrument data |
| 1 | alg |
| 1 | feedback |
| 1 | fms |
| 1 | ams |
| 1 | operator count (always 4) |
| 3 | reserved |
| --- | FM operator data × 4 |
| 1 | am |
| 1 | ar |
| 1 | dr |
| 1 | mult |
| 1 | rr |
| 1 | sl |
| 1 | tl |
| 1 | dt2 |
| 1 | rs |
| 1 | dt |
| 1 | d2r |
| 1 | ssgEnv |
| 1 | dam |
| 1 | dvb |
| 1 | egt |
| 1 | ksl |
| 1 | sus |
| 1 | vib |
| 1 | ws |
| 1 | ksr |
| 12 | reserved |
| --- | Game Boy instrument data |
| 1 | volume |
| 1 | direction |
| 1 | length |
| 1 | sound length |
| --- | C64 instrument data |
| 1 | triangle |
| 1 | saw |
| 1 | pulse |
| 1 | noise |
| 1 | attack |
| 1 | decay |
| 1 | sustain |
| 1 | release |
| 2 | duty |
| 1 | ring mod |
| 1 | osc sync |
| 1 | to filter |
| 1 | init filter |
| 1 | vol macro is cutoff |
| 1 | resonance |
| 1 | low pass |
| 1 | band pass |
| 1 | high pass |
| 1 | channel 3 off |
| 2 | cutoff |
| 1 | duty macro is absolute |
| 1 | filter macro is absolute |
| --- | Amiga instrument data |
| 2 | initial sample |
| 14 | reserved |
| --- | standard instrument data |
| 4 | volume macro length |
| 4 | arp macro length |
| 4 | duty macro length |
| 4 | wave macro length |
| 4 | pitch macro length (>=17) |
| 4 | extra 1 macro length (>=17) |
| 4 | extra 2 macro length (>=17) |
| 4 | extra 3 macro length (>=17) |
| 4 | volume macro loop |
| 4 | arp macro loop |
| 4 | duty macro loop |
| 4 | wave macro loop |
| 4 | pitch macro loop (>=17) |
| 4 | extra 1 macro loop (>=17) |
| 4 | extra 2 macro loop (>=17) |
| 4 | extra 3 macro loop (>=17) |
| 1 | arp macro mode |
| 1 | reserved (>=17) or volume macro height (>=15) or reserved |
| 1 | reserved (>=17) or duty macro height (>=15) or reserved |
| 1 | reserved (>=17) or wave macro height (>=15) or reserved |
| 4?? | volume macro |
| 4?? | arp macro |
| 4?? | duty macro |
| 4?? | wave macro |
| 4?? | pitch macro (>=17) |
| 4?? | extra 1 macro (>=17) |
| 4?? | extra 2 macro (>=17) |
| 4?? | extra 3 macro (>=17) |
wavetable
| size | description |
|---|---|
| 4 | "WAVE" block ID |
| 4 | reserved |
| ??? | wavetable name |
| 4 | wavetable size |
| 4 | wavetable min |
| 4 | wavetable max |
| 4?? | wavetable data |
sample
| size | description |
|---|---|
| 4 | "SMPL" block ID |
| 4 | reserved |
| ??? | sample name |
| 4 | length |
| 4 | rate |
| 2 | volume |
| 2 | pitch |
| 1 | depth |
| 7 | reserved |
| 2?? | sample data (always 16-bit) |
pattern
| size | description |
|---|---|
| 4 | "PATR" block ID |
| 4 | reserved |
| 2 | channel |
| 2 | pattern index |
| 4 | reserved |
| ??? | pattern data |
| - size: rows*(4+effectColumns*2)*2 | |
| - read shorts in this order: | |
| - note | |
| - octave | |
| - instrument | |
| - volume | |
| - effect and effect data... |
the Furnace instrument format (.fui)
the instrument format is pretty similar to the file format, but it also stores wavetables and samples used by the instrument.
| size | description |
|---|---|
| 16 | "-Furnace instr.-" format magic |
| 2 | format version |
| 2 | reserved |
| 4 | pointer to instrument data |
| 2 | wavetable count |
| 2 | sample count |
| 4 | reserved |
| 4?? | pointers to wavetables |
| 4?? | pointers to samples |
instrument data follows.
the Furnace wavetable format (.fuw)
similar to the instrument format...
| size | description |
|---|---|
| 16 | "-Furnace waveta-" format magic |
| 2 | format version |
| 2 | reserved |
wavetable data follows.