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101 lines
3.1 KiB
Python
101 lines
3.1 KiB
Python
# SPDX-License-Identifier: BSD-3-Clause
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#
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# Generate comparison MIDI file.
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#
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# The comparison MIDI is used for testing and tweaking the similarity
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# groups in the configuration file. In each group, the instruments in
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# the group should sound broadly similar, and the first in the group
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# should be able to substitute for any member of the group.
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#
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# Each similarity group is played in order, with a pause between each
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# instrument. A programme of the instruments is printed to stdout so
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# that the user can identify each instrument in order.
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#
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# To use the comparison MIDI, use a port that supports Timidity for
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# MIDI playback, and configure it to use the GUS patch set (use
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# music/dgguspat.zip from the idgames archive). Use the "full"
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# configuration file (timidity.cfg in the .zip) so that every
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# instrument is used for playback. Rename comparison.mid to
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# d_runnin.lmp and run with '-file d_runnin.lmp -warp 1', so that the
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# music plays.
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from config import *
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import midi
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def instrument_num(instrument):
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"""Given a GUS patch name, get the MIDI instrument number.
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For percussion instruments, the instrument number is offset
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by 128.
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"""
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for key, name in GUS_INSTR_PATCHES.items():
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if name == instrument:
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return key
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raise Exception('Unknown instrument %s' % instrument)
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pattern = midi.Pattern(resolution=48)
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track = midi.Track()
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track.append(midi.ControlChangeEvent(tick=0, channel=9, data=[7, 92]))
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time = 500
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for group in SIMILAR_GROUPS:
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# Don't bother with special effects.
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#if group[0] == 'blank':
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# continue
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print "Group: "
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empty = True
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for instrument in group:
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inum = instrument_num(instrument)
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# For normal instruments, play a couple of different notes.
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# For percussion instruments, play a couple of note on
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# the percussion channel.
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if inum <= 128:
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print "\t%s (%i)" % (instrument, inum)
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track.extend([
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midi.ProgramChangeEvent(tick=time, channel=0,
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data=[inum]),
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midi.NoteOnEvent(tick=0, channel=0,
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velocity=92, pitch=midi.A_3),
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midi.NoteOffEvent(tick=50, channel=0,
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velocity=92, pitch=midi.A_3),
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midi.NoteOnEvent(tick=0, channel=0,
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velocity=92, pitch=midi.B_3),
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midi.NoteOffEvent(tick=50, channel=0,
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velocity=92, pitch=midi.B_3),
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])
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else:
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print "\t%s (percussion %i)" % (instrument, inum-128)
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track.extend([
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midi.NoteOnEvent(tick=time, channel=9,
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velocity=92, pitch=inum-128),
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midi.NoteOffEvent(tick=50, channel=9,
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pitch=inum-128),
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midi.NoteOnEvent(tick=0, channel=9,
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velocity=92, pitch=inum-128),
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midi.NoteOffEvent(tick=50, channel=9,
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pitch=inum-128),
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])
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empty = False
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time = 100
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if not empty:
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time = 500
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# Four drumbeats indicate the end of the track and that the music is
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# going to loop.
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for i in range(4):
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track.extend([
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midi.NoteOnEvent(tick=20, channel=9, velocity=92, pitch=35),
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midi.NoteOffEvent(tick=20, channel=9, pitch=35),
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])
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track.append(midi.EndOfTrackEvent(tick=1))
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pattern.append(track)
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# Save the pattern to disk
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midi.write_midifile("comparison.mid", pattern)
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