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8835afef5f
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...).
58 lines
1.2 KiB
Python
58 lines
1.2 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 Creative SBI OPL instrument files.
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#
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import struct
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import sys
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HEADER_VALUE = "SBI\x1a"
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FIELDS = [
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"m_am_vibrato_eg",
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"c_am_vibrato_eg",
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"m_ksl_volume",
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"c_ksl_volume",
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"m_attack_decay",
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"c_attack_decay",
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"m_sustain_release",
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"c_sustain_release",
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"m_waveform",
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"c_waveform",
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"feedback_fm"
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]
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def read(filename):
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with open(filename, "rb") as f:
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data = f.read()
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header, name = struct.unpack("4s32s", data[0:36])
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header = header.decode("ascii")
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if header != HEADER_VALUE:
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raise Exception("Invalid header for SBI file!")
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instr_data = data[36:]
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result = { "name": name.decode("ascii").rstrip("\0") }
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for i in range(len(FIELDS)):
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result[FIELDS[i]], = struct.unpack("B", instr_data[i:i+1])
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return result
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def write(filename, data):
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with open(filename, "wb") as f:
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f.write(struct.pack("4s", HEADER_VALUE.encode("ascii")))
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f.write(struct.pack("32s", data["name"].encode("ascii")))
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for field in FIELDS:
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f.write(struct.pack("B", data[field]))
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for x in range(16 - len(FIELDS)):
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f.write(struct.pack("B", 0))
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if __name__ == "__main__":
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for filename in sys.argv[1:]:
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print(filename)
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print(read(filename))
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