morse-code-cli/translate.py at main · mesalilac/morse-code-cli · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
import wave
import struct
import math
from io import StringIO

MORSE_MAP: dict[str, str] = {
    "A": ".-",
    "B": "-...",
    "C": "-.-.",
    "D": "-..",
    "E": ".",
    "F": "..-.",
    "G": "--.",
    "H": "....",
    "I": "..",
    "J": ".---",
    "K": "-.-",
    "L": ".-..",
    "M": "--",
    "N": "-.",
    "O": "---",
    "P": ".--.",
    "Q": "--.-",
    "R": ".-.",
    "S": "...",
    "T": "-",
    "U": "..-",
    "V": "...-",
    "W": ".--",
    "X": "-..-",
    "Y": "-.--",
    "Z": "--..",
    "0": "-----",
    "1": ".----",
    "2": "..---",
    "3": "...--",
    "4": "....-",
    "5": ".....",
    "6": "-....",
    "7": "--...",
    "8": "---..",
    "9": "----.",
    " ": "/",
}

REVERSE_MORSE_MAP: dict[str, str] = {v: k for k, v in MORSE_MAP.items()}


def to_morse(text: str) -> str:
    text = text.strip().upper()

    morse_tokens: list[str] = []

    for char in text:
        symbol = MORSE_MAP.get(char)

        if symbol is not None:
            morse_tokens.append(symbol)

    return " ".join(morse_tokens)


def to_text(code: str) -> str:
    code = code.strip()

    buffer = StringIO()

    parts = code.split()

    for part in parts:
        char = REVERSE_MORSE_MAP.get(part)

        if char is None:
            continue

        buffer.write(char)

    content = buffer.getvalue()
    buffer.close()
    return content


def to_audio(code: str, output: str) -> None:
    SAMPLE_RATE = 44100
    FREQUENCY = 800.0
    UNIT_DURATION = 0.1

    # 32767 is max for 16-bit audio
    AMPLITUDE = 32767

    audio_frames = []

    for symbol in code:
        if symbol == ".":
            duration = UNIT_DURATION
        elif symbol == "-":
            duration = UNIT_DURATION * 3
        elif symbol == "/":
            duration = UNIT_DURATION * 7
        else:
            duration = UNIT_DURATION

        num_samples = int(duration * SAMPLE_RATE)
        for i in range(num_samples):
            if symbol in (".", "-"):
                value = int(
                    AMPLITUDE * math.sin(2 * math.pi * FREQUENCY * (i / SAMPLE_RATE))
                )
                audio_frames.append(struct.pack("<h", value))
            else:
                audio_frames.append(struct.pack("<h", 0))

        if symbol in (".", "-"):
            for _ in range(int(UNIT_DURATION * SAMPLE_RATE)):
                audio_frames.append(struct.pack("<h", 0))

    with wave.open(output, "wb") as wav_file:
        wav_file.setnchannels(1)
        wav_file.setsampwidth(2)
        wav_file.setframerate(SAMPLE_RATE)
        wav_file.writeframes(b"".join(audio_frames))