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Implement sample-based oscillators, with sample import from gm.dls.

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Veikko Sariola
2020-05-19 18:29:47 +03:00
parent 77b989d88d
commit adc4a6e45f
13 changed files with 280 additions and 6 deletions
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54
scripts/parse_gmdls.py Normal file
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# Usage: python parse_gmdls.py <path-to-gmdls>
# Parses the GMDLs sample and loop locations and dumps them ready to be included in the SU_BEGIN_SAMPLE_OFFSETS block
import sys
def read_chunk(file,indent=0):
name = f.read(4)
length_bytes = f.read(4)
length = int.from_bytes(length_bytes,byteorder='little')
data = None
start = f.tell()
if name == b"RIFF" or name == b"LIST":
name = f.read(4)
data = list()
while f.tell() < start+length:
data.append(read_chunk(file,indent + 4))
if name == b"wave":
datablock = next((x[1] for x in data if x[0] == b"data"))
wsmp = next((x[1] for x in data if x[0] == b"wsmp"), None)
if "loopstart" not in wsmp:
loopstart,looplength = datablock["length"]/2-1,1 # For samples without loop, keep on repeating the last sample
else:
loopstart,looplength = wsmp["loopstart"],wsmp["looplength"]
INFO = next((x[1] for x in data if x[0] == b"INFO"), None)
INAM = next((x[1] for x in INFO if x[0] == b"INAM"), None)
name = ""
if INAM is not None:
name = INAM["name"]
t = 60 - wsmp["unitynote"] # in MIDI, the middle C = 263 Hz is 60. In Sointu/4klang, it's 72.
print("SAMPLE_OFFSET START(%d),LOOPSTART(%d),LOOPLENGTH(%d) ; name %s, unitynote %d (transpose to %d), data length %d" % (datablock["start"],loopstart,looplength,name,wsmp["unitynote"],t,datablock["length"]))
# Something is oddly off: LOOPSTART + LOOPLENGTH != DATA LENGTH /2, but rather LOOPSTART + LOOPLENGTH != DATA LENGTH /2 - 1
# Logically, LOOPSTART = 0 would mean the sample loops from the beginning. But then why would they store one extra sample?
# Or, maybe start+length is the index of the last sample included in the loop. For now, I'm assuming that start+length-1
# is the last sample and there's one unused sample.
elif name == b"wsmp":
f.read(4)
data = dict()
data["unitynote"] = int.from_bytes(f.read(2),byteorder='little')
f.read(10)
numloops = int.from_bytes(f.read(4),byteorder='little')
if numloops > 0:
f.read(8)
data["loopstart"] = int.from_bytes(f.read(4),byteorder='little')
data["looplength"] = int.from_bytes(f.read(4),byteorder='little')
elif name == b"data":
data = {"start": f.tell()/2, "length": length/2}
elif name == b"INAM":
data = {"name": f.read(length-1).decode("ascii")}
f.read(length - f.tell() + start + (length & 1))
return (name,data)
if __name__ == "__main__":
with open(sys.argv[1], "rb") as f:
read_chunk(f)