Zack Buhman
86d12c37ed
This adds both a midi generator and a midi type 1 simulator. While I would have preferred to use an existing tool for this, I found that timidity++ does not emit pitch wheel events correctly, and I don't know of another widely-distributed tool that does midi-to-midi format conversion. The c++ and python versions were co-developed. I wrote one to test the other. There is more cleanup to do, but `roundtrip.cpp` produces a valid type 0 midi file given a type 1 or type 0 midi file as input.
75 lines
2.0 KiB
Python
75 lines
2.0 KiB
Python
from itertools import chain
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from parser import *
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"""
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_slots = set()
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def simulate_note(ix, ev):
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if type(ev.event) is NoteOn:
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print(repr(ev.event))
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_slots.add((ev.event.channel, ev.event.note))
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assert len(_slots) <= 32, (hex(ix))
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if type(ev.event) is NoteOff:
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print(repr(ev.event))
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try:
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_slots.remove((ev.event.channel, ev.event.note))
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except:
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print("ix", hex(ix))
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raise
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"""
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def linearize_track(track):
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time = 0
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for i, event in enumerate(track.events):
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time += event.delta_time
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yield time, i, event
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l = {
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NoteOff: 0,
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NoteOn: 1,
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PolyphonicKeyPressure: 2,
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ControlChange: 3,
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ProgramChange: 4,
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ChannelPressure: 5,
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PitchBendChange: 6,
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ChannelMode: 7,
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}
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def sort_key(global_time, i, event):
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channel = event.event.event.channel if type(event.event) is MIDIEvent else 99
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priority = -l[type(event.event.event)] if type(event.event) is MIDIEvent else -99
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return global_time, priority, channel
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def linearize_events(tracks):
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global_time = 0
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linearized = list(chain.from_iterable(map(linearize_track, tracks)))
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linear_sort = sorted(linearized, key=lambda args: sort_key(*args))
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for abs_time, i, event in linear_sort:
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if type(event.event) is MetaEvent and event.event.type is MetaType.EndOfTrack:
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continue
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inner_event = event.event
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delta_time = abs_time - global_time
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print(Event(delta_time, inner_event))
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global_time = abs_time
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print(Event(delta_time=0, event=MetaEvent(type=MetaType.EndOfTrack, value=None)))
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def dump_file(buf):
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buf, header = parse_header(buf)
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print(header)
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assert header.ntrks > 0
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tracks = []
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for track_num in range(header.ntrks):
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buf, track = parse_track(buf)
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tracks.append(track)
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print("remaining data:", len(buf))
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assert len(buf) == 0, bytes(buf)
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linearize_events(tracks)
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import sys
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with open(sys.argv[1], 'rb') as f:
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b = memoryview(f.read())
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dump_file(b)
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