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3b96d7f1de
Split out code for handling the GENMIDI format into a separate genmidi.py file. Add routine to load the contents of a GENMIDI lump.
99 lines
3.3 KiB
Python
99 lines
3.3 KiB
Python
#!/usr/bin/env python
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#
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# Copyright (c) 2011, 2012
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# Contributors to the Freedoom project. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# * Neither the name of the freedoom project nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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# IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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# OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# ----------------------------------------------------------------------
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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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