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70 lines
2.7 KiB
Python
70 lines
2.7 KiB
Python
#!/usr/bin/python
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import sys
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#from mido import MidiFile
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import mido
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optarg = 1
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timescale = 16.0 # Scale time to 16th of a second
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extperchan = 9 # Default to standard MIDI channel 10 for extra percussion
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if len(sys.argv) == 1:
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print('Usage:', sys.argv[0], '[-p extra_percussion_channel] [-t timescale] MIDI_file')
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sys.exit(0)
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# Parse optional arguments
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while optarg < (len(sys.argv) - 1):
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if sys.argv[optarg] == '-t': # Override tempo percentage
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timescale = float(sys.argv[optarg + 1]) * 16.0
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optarg += 2
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if sys.argv[optarg] == '-p': # Add extra percussion channel
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extperchan = int(sys.argv[optarg + 1]) - 1
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optarg += 2
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mid = mido.MidiFile(sys.argv[optarg])
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timeshift = timescale
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totaltime = 0
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eventtime = 0.0
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for msg in mid:
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eventtime += msg.time * timeshift
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#print '; time = ', msg.time
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if msg.type == 'note_on' or msg.type == 'note_off':
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#if eventtime > 0.0 and eventtime < 0.5:
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# eventtime = 0.5
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deltatime = int(round(eventtime))
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octave = int(msg.note / 12 - 1)
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onote = int(msg.note % 12)
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lrchan = int(msg.channel & 1)
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vol = int(msg.velocity >> 3)
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print('type=%s onote=%d lrchan=%d vol=%d' % (msg.type, onote, lrchan, vol))
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if msg.velocity > 0 and vol == 0:
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vol = 1
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if msg.type == 'note_off':
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vol = 0
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if octave < 0:
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octave = 0
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totaltime += deltatime
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if msg.channel == 9 or msg.channel == extperchan:
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#
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# Percussion
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#
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if vol > 0:
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print('\t!BYTE\t${0:02X}, ${1:02X}, ${2:02X}\t; Percussion {3:d} Chan {4:d} Dur {5:d}'.format(deltatime, msg.note ^ 0x40, (lrchan << 7) | vol, msg.note, msg.channel + 1, vol))
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if extperchan == 9: # Play percussion on both channels if no extended percussion
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print('\t!BYTE\t${0:02X}, ${1:02X}, ${2:02X}\t; Percussion {3:d} Chan {4:d} Dur {5:d}'.format(0, msg.note ^ 0x40, vol, msg.note, msg.channel + 1, vol))
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eventtime = 0.0
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else:
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#
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# Note
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#
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print('\t!BYTE\t${0:02X}, ${1:02X}, ${2:02X}\t; Note {3:d} Chan {4:d} Vol {5:d}'.format(deltatime, 0x80 | (octave << 4) | onote, (lrchan << 7) | vol, msg.note, msg.channel + 1, vol))
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eventtime = 0.0
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elif msg.type == 'set_tempo':
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pass
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#timeshift = msg.tempo / 500000.0 * timescale
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#print '; timescale = ', timescale
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elif msg.type == 'time_signature':
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pass
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elif msg.type == 'control_chage':
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pass
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elif msg.type == 'program_change':
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pass
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print('\t!BYTE\t${0:02X}, $00, $00'.format(int(eventtime + 0.5)))
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