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dx7db.py
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# Takes a directory full of DX7 sysex patches and outputs a compacted unique list of voices
import os, sys, hashlib
import mido
# I got this by paying $2 for https://gumroad.com/dxsysex
# the default ones were all at https://yamahablackboxes.com/collection/yamaha-dx7-synthesizer/patches/#factory
def get_all_syx_files(dir):
sysexs = []
for path, directories, files in os.walk(dir):
for file in files:
d = os.path.join(path, file)
if d.endswith("syx") or d.endswith("SYX"):
sysexs.append(d)
return sysexs
# Pull the name and voice out of a 128 byte buffer, and compute a hash of just the parameters
def parse_128b(buf):
name = buf[118:128]
digest = hashlib.md5(buf[:118]).hexdigest()
return (buf, name, digest)
# Pull 32 voices out of a sysex patch bank, the most common form
def parse_4104b(buf):
voices = []
for i in range(32):
start_byte = 6 + (i*128)
end_byte = start_byte + 128
voices.append(parse_128b(buf[start_byte:end_byte]))
return voices
# Pull 32 patches out of a headerless bank
def parse_4096b(buf):
buf = "000000" + buf + "00"
return parse_4104b(buf)
# Two sysex messages
def parse_8208b(buf):
return parse_4104b(buf) + parse_4104b(buf[4104:])
# There's many other types in the dataset but the counts per type are too low to worry about
def sysex_message(patch, channel):
import dx7
# get the 155 bytes for the patch number from the C extension
if(type(patch)==int):
patch_data = dx7.unpack(patch)
else:
patch_data = patch
# generate the twos complement checksum for the patch data
# from these dudes fighting w/ each other about who has the best programming skills sigh
# https://yamahamusicians.com/forum/viewtopic.php?t=6864
check = ~sum(patch_data) + 1 & 0x7F
# Generate the sysex message
byte_count = 155 # always 155 bytes of patch information (the operator-on message is only for live mode)
msb = int(byte_count / 127)
lsb = (byte_count % 127) - 1
return [0x43, channel, 0, msb, lsb] + patch_data + [check]
_port = mido.open_output()
def update_voice(patch, channel):
sysex = sysex_message(patch, channel)
msg = mido.Message('sysex', data=sysex)
#_port.send(program)
_port.send(msg)
def play_note(note, channel):
msg = mido.Message('note_on', note=note, velocity=127,channel=channel)
_port.send(msg)
def stop_note(note,channel):
msg = mido.Message('note_off',note=note, channel = channel, velocity=0)
_port.send(msg)
def unpack_packed_patch(p):
# Input is a 128 byte thing from compact.bin
# Output is a 156 byte thing that the synth knows about
o = [0]*156
for op in range(6):
o[op*21:op*21 + 11] = p[op*17:op*17+11]
leftrightcurves = p[op*17+11]
o[op * 21 + 11] = leftrightcurves & 3
o[op * 21 + 12] = (leftrightcurves >> 2) & 3
detune_rs = p[op * 17 + 12]
o[op * 21 + 13] = detune_rs & 7
o[op * 21 + 20] = detune_rs >> 3
kvs_ams = p[op * 17 + 13]
o[op * 21 + 14] = kvs_ams & 3
o[op * 21 + 15] = kvs_ams >> 2
o[op * 21 + 16] = p[op * 17 + 14]
fcoarse_mode = p[op * 17 + 15]
o[op * 21 + 17] = fcoarse_mode & 1
o[op * 21 + 18] = fcoarse_mode >> 1
o[op * 21 + 19] = p[op * 17 + 16]
o[126:126+9] = p[102:102+9]
oks_fb = p[111]
o[135] = oks_fb & 7
o[136] = oks_fb >> 3
o[137:137+4] = p[112:112+4]
lpms_lfw_lks = p[116]
o[141] = lpms_lfw_lks & 1
o[142] = (lpms_lfw_lks >> 1) & 7
o[143] = lpms_lfw_lks >> 4
o[144:144+11] = p[117:117+11]
o[155] = 0x3f
# Clamp the unpacked patches to a known max.
maxes = [
99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, # osc6
3, 3, 7, 3, 7, 99, 1, 31, 99, 14,
99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, # osc5
3, 3, 7, 3, 7, 99, 1, 31, 99, 14,
99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, # osc4
3, 3, 7, 3, 7, 99, 1, 31, 99, 14,
99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, # osc3
3, 3, 7, 3, 7, 99, 1, 31, 99, 14,
99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, # osc2
3, 3, 7, 3, 7, 99, 1, 31, 99, 14,
99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, # osc1
3, 3, 7, 3, 7, 99, 1, 31, 99, 14,
99, 99, 99, 99, 99, 99, 99, 99, # pitch eg rate & level
31, 7, 1, 99, 99, 99, 99, 1, 5, 7, 48, # algorithm etc
126, 126, 126, 126, 126, 126, 126, 126, 126, 126, # name
127 # operator on/off
]
for i in range(156):
if(o[i] > maxes[i]): o[i] = maxes[i]
if(o[i] < 0): o[i] = 0
return o
def parse_all(do_dedup=True, folder='/Users/bwhitman/outside/learnfm/default'):
all_files = sorted(get_all_syx_files(folder))
all_patches =[]
total = 0
cant = 0
if(do_dedup):
dedup = {}
else:
dedup = []
for i,f in enumerate(all_files):
data = bytearray(open(f, 'rb').read())
if(len(data) == 4104):
p = parse_4104b(data)
elif(len(data) == 4096):
p = parse_4096b(data)
elif(len(data) == 8208):
p = parse_8208b(data)
else:
cant = cant + 1
for patch in p:
total = total + 1
if(do_dedup):
dedup[patch[2]] = patch
else:
dedup.append(bytes(unpack_packed_patch(patch[0])))
return dedup
def convert_compact_to_unpacked():
# Take a compact.bin and make it unpacked.bin
f = bytearray(open("compact.bin").read())
o = open("unpacked.bin", "w")
num_patches = len(f)/128
for patch in xrange(num_patches):
patch_data = f[patch*128:patch*128+128]
unpacked = unpack_packed_patch(patch_data)
o.write(bytearray(unpacked))
o.close()
# Writes all the voices to a binary file of 128 x patches, and also the names in ASCII to a txt file.
def main():
compact = open("compact.bin", "wb")
names = open("names.txt", "w")
dedup = parse_all()
for r in dedup.items():
compact.write(r[1][0])
name = r[1][1] # the name will be the first name of this voice we saw
for i,char in enumerate(name):
# Make sure the name is actually ASCII printable
if(char < 32): name[i] = ' '
if(char > 126): name[i] = ' '
names.write(name)
names.write('\n')
compact.close()
names.close()
print("Wrote %d patches to compact.bin & names.txt" % (len(dedup.items())))
if __name__ == "__main__":
main()