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https://gitlab.com/80486DX2-66/gists
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88 lines
2.0 KiB
Python
88 lines
2.0 KiB
Python
#!/usr/bin/env python3
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# binary_to_midi.py
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#
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# Author: Intel A80486DX2-66
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# License: Creative Commons Zero 1.0 Universal or Unlicense
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# SPDX-License-Identifier: CC0-1.0 OR Unlicense
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from decimal import Decimal
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from midiutil import MIDIFile
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from os import stat
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from sys import argv
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NOTE_TABLE = {i: 52 + i for i in range(8 * 2)}
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is_prime = lambda n: n > 1 and all(n % i for i in range(2, n))
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TEMPO = 110
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TIME_SIGNATURE = (4, 4)
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INSTRUMENT_SELECTED = 1
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STEP_SIZE = 1
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DURATION_CONSTANT = 32
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def binary_to_midi(input_file, output_file):
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print("Reading file")
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with open(input_file, "rb") as f:
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byte_data = f.read()
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print("Initialization")
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pattern = MIDIFile(1, TIME_SIGNATURE, TEMPO)
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pattern.addTempo(0, 0, TEMPO)
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track = 0
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channel = 0
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time = 0
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chords = []
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current_chord = []
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previous_note = NOTE_TABLE[0]
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byte_step = (len(byte_data) // 2**6) + 1
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print("Converting")
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taking_chord = False
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for i, byte in enumerate(byte_data[::STEP_SIZE]):
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is_rest = False
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note = NOTE_TABLE[byte % len(NOTE_TABLE)]
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is_previous_note = i > 0 and note == previous_note
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if byte % 51 == 25:
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is_rest = True
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elif byte % 12 == 0:
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current_chord = [note]
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chords.append(current_chord)
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taking_chord = True
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elif taking_chord:
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current_chord.append(note)
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taking_chord = False
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duration = (Decimal('0.25') if is_prime(byte) or byte % 11 < 6 else \
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Decimal('0.015')) * DURATION_CONSTANT
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if abs(previous_note - note) > 3 and not is_previous_note:
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current_chord.append(0)
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previous_note = note
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pattern.addProgramChange(0, 0, 0, INSTRUMENT_SELECTED)
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for chord in chords:
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for note in chord:
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if is_rest:
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pattern.addNote(track, channel, 0, time, duration, 0)
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else:
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pattern.addNote(track, channel, note, time, duration, 100)
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time += duration
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print("Writing out")
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with open(output_file, "wb") as file:
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pattern.writeFile(file)
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print(f"Saved, {stat(output_file).st_size} bytes")
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if __name__ == "__main__":
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if len(argv) < 2:
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print("Fatal error: No file specified as argument.")
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exit(1)
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binary_to_midi(argv[1], "output.mid")
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