From 51507bf354571a775269dac1fd547f29a8219172 Mon Sep 17 00:00:00 2001
From: Intel A80486DX2-66 <larry.holst@disroot.org>
Date: Sat, 20 Jul 2024 18:14:56 +0300
Subject: [PATCH] add binary_to_midi.py

---
 python-programming/.gitignore        |  3 +
 python-programming/binary_to_midi.py | 87 ++++++++++++++++++++++++++++
 2 files changed, 90 insertions(+)
 create mode 100644 python-programming/binary_to_midi.py

diff --git a/python-programming/.gitignore b/python-programming/.gitignore
index 68bc17f..f455f24 100644
--- a/python-programming/.gitignore
+++ b/python-programming/.gitignore
@@ -158,3 +158,6 @@ cython_debug/
 #  and can be added to the global gitignore or merged into this file.  For a more nuclear
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
 #.idea/
+
+# Output files
+output.*
diff --git a/python-programming/binary_to_midi.py b/python-programming/binary_to_midi.py
new file mode 100644
index 0000000..b52af07
--- /dev/null
+++ b/python-programming/binary_to_midi.py
@@ -0,0 +1,87 @@
+#!/usr/bin/python3
+
+# binary_to_midi.py
+#
+# Author: Intel A80486DX2-66
+# License: Creative Commons Zero 1.0 Universal or Unlicense
+# SPDX-License-Identifier: CC0-1.0 OR Unlicense
+
+from decimal import Decimal
+from midiutil import MIDIFile
+from os import stat
+from sys import argv
+
+NOTE_TABLE = {i: 52 + i for i in range(8 * 2)}
+
+is_prime = lambda n: n > 1 and all(n % i for i in range(2, n))
+
+TEMPO = 110
+TIME_SIGNATURE = (4, 4)
+INSTRUMENT_SELECTED = 1
+STEP_SIZE = 1
+DURATION_CONSTANT = 32
+
+
+def binary_to_midi(input_file, output_file):
+	print("Reading file")
+	with open(input_file, "rb") as f:
+		byte_data = f.read()
+
+	print("Initialization")
+	pattern = MIDIFile(1, TIME_SIGNATURE, TEMPO)
+	pattern.addTempo(0, 0, TEMPO)
+	track = 0
+	channel = 0
+	time = 0
+
+	chords = []
+	current_chord = []
+
+	previous_note = NOTE_TABLE[0]
+	byte_step = (len(byte_data) // 2**6) + 1
+
+	print("Converting")
+	taking_chord = False
+	for i, byte in enumerate(byte_data[::STEP_SIZE]):
+		is_rest = False
+		note = NOTE_TABLE[byte % len(NOTE_TABLE)]
+		is_previous_note = i > 0 and note == previous_note
+
+		if byte % 51 == 25:
+			is_rest = True
+		elif byte % 12 == 0:
+			current_chord = [note]
+			chords.append(current_chord)
+			taking_chord = True
+		elif taking_chord:
+			current_chord.append(note)
+			taking_chord = False
+
+		duration = (Decimal('0.25') if is_prime(byte) or byte % 11 < 6 else \
+		            Decimal('0.015')) * DURATION_CONSTANT
+
+		if abs(previous_note - note) > 3 and not is_previous_note:
+			current_chord.append(0)
+			previous_note = note
+
+	pattern.addProgramChange(0, 0, 0, INSTRUMENT_SELECTED)
+	for chord in chords:
+		for note in chord:
+			if is_rest:
+				pattern.addNote(track, channel, 0, time, duration, 0)
+			else:
+				pattern.addNote(track, channel, note, time, duration, 100)
+		time += duration
+
+	print("Writing out")
+	with open(output_file, "wb") as file:
+		pattern.writeFile(file)
+	print(f"Saved, {stat(output_file).st_size} bytes")
+
+
+if __name__ == "__main__":
+	if len(argv) < 2:
+		print("Fatal error: No file specified as argument.")
+		exit(1)
+
+	binary_to_midi(argv[1], "output.mid")