am I gonna make a new format
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# introduction
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furnace is a tool which allows you to compose music using the sound chips of several video game consoles from the 8/16-bit era.
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the motivation behind this project is the fact that TODO!
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# Furnace user manual
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TOOOODOOOOOOOO
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# the Furnace file format (.fur)
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while Furnace works directly with the .dmf format, I had to create a new format to handle future additions to the program.
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this document has the goal of detailing the format.
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# header
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the header is 32 bytes long.
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size | description
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-----|------------------------------------
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16 | "-Furnace module-" format magic
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2 | format version
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| - should be 1 for Furnace 0.2
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2 | reserved
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4 | song info pointer
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8 | reserved
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# song info
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size | description
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-----|------------------------------------
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4 | "INFO" block ID
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4 | length of this block
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1 | time base
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1 | speed 1
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1 | speed 2
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1 | initial arpeggio time
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4f | ticks per second
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| - 60 is NTSC
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| - 50 is PAL
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2 | pattern length
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2 | orders length
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1 | highlight A
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1 | highlight B
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2 | instrument count
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2 | wavetable count
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2 | sample count
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4 | pattern count
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1 | sound chip count
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31 | list of sound chips
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| - possible soundchips:
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| - 0x00: invalid - 0 channels
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| - 0x01: YMU759 - 17 channels
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| - 0x02: Genesis - 10 channels
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| - 0x03: SMS (SN76489) - 4 channels
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| - 0x04: Game Boy - 4 channels
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| - 0x05: PC Engine - 6 channels
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| - 0x06: NES - 5 channels
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| - 0x07: C64 (8580) - 3 channels
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| - 0x08: Arcade (YM2151) - 13 channels
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| - 0x09: Neo Geo (YM2610) - 13 channels
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| - bit 6 enables alternate mode:
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| - 0x42: Genesis extended - 13 channels
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| - 0x47: C64 (6581) - 3 channels
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| - 0x49: Neo Geo extended - 16 channels
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4 | reserved
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124 | sound chip parameters (TODO)
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4 | pointer song name
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4 | pointer to song author
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24 | reserved for compatibility flags
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4?? | pointers to instruments
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4?? | pointers to wavetables
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4?? | pointers to samples
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4?? | pointers to patterns
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??? | orders
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| - a table of shorts
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| - size=channels*ordLen
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??? | effect columns
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| - size=channels
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# instrument
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size | description
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-----|------------------------------------
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4 | "INST" block ID
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4 | length of this block
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2 | format version (see header)
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1 | instrument type
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| - 0: standard
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| - 1: FM
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| - 2: Game Boy
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| - 3: C64
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| - 4: Amiga/sample
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1 | reserved
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4 | pointer to instrument name
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--- | **FM instrument data**
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1 | alg
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1 | feedback
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1 | fms
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1 | ams
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1 | operator count (always 4)
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3 | reserved
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--- | **FM operator data** × 4
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1 | am
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1 | ar
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1 | dr
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1 | mult
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1 | rr
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1 | sl
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1 | tl
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1 | dt2
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1 | rs
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1 | dt
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1 | d2r
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1 | ssgEnv
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1 | dam
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1 | dvb
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1 | egt
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1 | ksl
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1 | sus
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1 | vib
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1 | ws
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1 | ksr
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12 | reserved
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--- | **Game Boy instrument data**
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1 | volume
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1 | direction
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1 | length
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1 | sound length
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--- | **C64 instrument data**
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1 | triangle
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1 | saw
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1 | pulse
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1 | noise
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1 | attack
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1 | decay
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1 | sustain
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1 | release
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2 | duty
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1 | ring mod
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1 | osc sync
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1 | to filter
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1 | init filter
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1 | vol macro is cutoff
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1 | resonance
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1 | low pass
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1 | band pass
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1 | high pass
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1 | channel 3 off
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2 | cutoff
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1 | duty macro is absolute
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1 | filter macro is absolute
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--- | **Amiga instrument data**
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2 | initial sample
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14 | reserved
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--- | **standard instrument data**
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4 | volume macro length
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4 | arp macro length
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4 | duty macro length
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4 | wave macro length
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4 | volume macro loop
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4 | arp macro loop
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4 | duty macro loop
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4 | wave macro loop
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1 | arp macro mode
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3 | reserved
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4?? | volume macro
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4?? | arp macro
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4?? | duty macro
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4?? | wave macro
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# wavetable
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size | description
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-----|------------------------------------
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4 | "WAVE" block ID
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4 | length of this block
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4 | pointer to wavetable name
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4 | wavetable size
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4 | wavetable min
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4 | wavetable max
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4?? | wavetable data
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# sample
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size | description
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-----|------------------------------------
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4 | "SMPL" block ID
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4 | length of this block
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4 | pointer to sample name
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4 | length
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4 | rate
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2 | volume
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2 | pitch
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1 | depth
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7 | reserved
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2?? | sample data (always 16-bit)
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# pattern
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size | description
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-----|------------------------------------
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4 | "PATR" block ID
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4 | length of this block
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2 | channel
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2 | pattern index
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4 | reserved
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??? | pattern data
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| - size: rows*(4+effectColumns*2)*2
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| - read shorts in this order:
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| - note
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| - octave
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| - instrument
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| - volume
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| - effect and effect data...
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