77 lines
1.9 KiB
Python
77 lines
1.9 KiB
Python
#!/usr/bin/env python3
|
|
# SPDX-License-Identifier: BSD-3-Clause
|
|
#
|
|
# Module to load OPL instrument files.
|
|
#
|
|
|
|
import os
|
|
import sys
|
|
import sbi_file
|
|
import a2i_file
|
|
|
|
# Check the specified instrument data is OPL2-compatible and does not
|
|
# use any OPL3 features. Returns an error message, or 'None' if data
|
|
# is valid.
|
|
|
|
|
|
def check_opl2(filename, data):
|
|
def opl2_warning(message):
|
|
print("%s: %s" % (filename, message), file=sys.stderr)
|
|
|
|
# CHA,B control stereo, but are ignored on OPL2, so it's no problem:
|
|
# if (data["feedback_fm"] & 0xf0) != 0:
|
|
# opl2_warning("Cannot use CHA,B,C,D: %02x" % data["feedback_fm"])
|
|
|
|
if data["m_waveform"] > 3:
|
|
opl2_warning(
|
|
"Modulator uses waveform %i: only 0-3 supported"
|
|
% data["m_waveform"]
|
|
)
|
|
if data["c_waveform"] > 3:
|
|
opl2_warning(
|
|
"Carrier uses waveform %i: only 0-3 supported" % data["c_waveform"]
|
|
)
|
|
|
|
|
|
def load_instrument(filename):
|
|
|
|
# As a hack, a literal dictionary of the values can be specified
|
|
# in place of a filename.
|
|
|
|
if isinstance(filename, dict):
|
|
return filename
|
|
|
|
filename = os.path.join("instruments", filename)
|
|
|
|
if filename.endswith(".a2i"):
|
|
result = a2i_file.read(filename)
|
|
elif filename.endswith(".sbi"):
|
|
result = sbi_file.read(filename)
|
|
else:
|
|
raise Exception("Unknown instrument file type: '%s'" % filename)
|
|
|
|
check_opl2(filename, result)
|
|
|
|
return result
|
|
|
|
|
|
class Instrument:
|
|
def __init__(self, file1, file2=None, off1=0, off2=0, note=None):
|
|
self.voice1 = load_instrument(file1)
|
|
|
|
if file2 is not None:
|
|
self.voice2 = load_instrument(file2)
|
|
else:
|
|
self.voice2 = None
|
|
|
|
self.fixed_note = note
|
|
self.offset1 = off1
|
|
self.offset2 = off2
|
|
|
|
|
|
NullInstrument = Instrument("dummy.sbi")
|
|
|
|
if __name__ == "__main__":
|
|
for filename in sys.argv[1:]:
|
|
Instrument(filename)
|