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