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// src/generator.rs
// Morse code WAV file generator for testing
use anyhow::Result;
use hound::{SampleFormat, WavSpec, WavWriter};
use std::collections::HashMap;
use std::f32::consts::PI;
use std::path::Path;
pub struct MorseGenerator {
sample_rate: u32,
frequency: f32,
_wpm: f32, // Stored for reference but not directly used in generation
dot_duration: f32,
dash_duration: f32,
element_gap: f32,
letter_gap: f32,
word_gap: f32,
}
impl MorseGenerator {
pub fn new(sample_rate: u32, frequency: f32, wpm: f32) -> Self {
let dot_duration = 1.2 / wpm; // seconds per dot
let dash_duration = 3.0 * dot_duration;
let element_gap = dot_duration; // gap between dots/dashes
let letter_gap = 3.0 * dot_duration; // gap between letters
let word_gap = 7.0 * dot_duration; // gap between words
Self {
sample_rate,
frequency,
_wpm: wpm,
dot_duration,
dash_duration,
element_gap,
letter_gap,
word_gap,
}
}
pub fn generate_wav_file<P: AsRef<Path>>(&self, text: &str, path: P) -> Result<()> {
let spec = WavSpec {
channels: 1,
sample_rate: self.sample_rate,
bits_per_sample: 16,
sample_format: SampleFormat::Int,
};
let mut writer = WavWriter::create(path, spec)?;
let morse_code = self.text_to_morse(text);
for &code in morse_code.iter() {
match code {
MorseElement::Dot => self.write_tone(&mut writer, self.dot_duration)?,
MorseElement::Dash => self.write_tone(&mut writer, self.dash_duration)?,
MorseElement::ElementGap => self.write_silence(&mut writer, self.element_gap)?,
MorseElement::LetterGap => self.write_silence(&mut writer, self.letter_gap)?,
MorseElement::WordGap => self.write_silence(&mut writer, self.word_gap)?,
}
}
writer.finalize()?;
Ok(())
}
fn write_tone<W: std::io::Write + std::io::Seek>(
&self,
writer: &mut WavWriter<W>,
duration: f32,
) -> Result<()> {
let samples = (duration * self.sample_rate as f32) as usize;
for i in 0..samples {
let t = i as f32 / self.sample_rate as f32;
let sample = (2.0 * PI * self.frequency * t).sin();
let amplitude = 0.5; // 50% amplitude to avoid clipping
writer.write_sample((sample * amplitude * i16::MAX as f32) as i16)?;
}
Ok(())
}
fn write_silence<W: std::io::Write + std::io::Seek>(
&self,
writer: &mut WavWriter<W>,
duration: f32,
) -> Result<()> {
let samples = (duration * self.sample_rate as f32) as usize;
for _ in 0..samples {
writer.write_sample(0i16)?;
}
Ok(())
}
fn text_to_morse(&self, text: &str) -> Vec<MorseElement> {
let morse_map = get_morse_map();
let mut result = Vec::new();
let words: Vec<&str> = text.split_whitespace().collect();
for (word_idx, word) in words.iter().enumerate() {
for (char_idx, ch) in word.chars().enumerate() {
if let Some(morse_str) = morse_map.get(&ch.to_ascii_uppercase()) {
for (elem_idx, morse_char) in morse_str.chars().enumerate() {
match morse_char {
'.' => result.push(MorseElement::Dot),
'-' => result.push(MorseElement::Dash),
_ => {}
}
// Add element gap between dots/dashes (except after last element)
if elem_idx < morse_str.len() - 1 {
result.push(MorseElement::ElementGap);
}
}
}
// Add letter gap between letters (except after last letter)
if char_idx < word.len() - 1 {
result.push(MorseElement::LetterGap);
}
}
// Add word gap between words (except after last word)
if word_idx < words.len() - 1 {
result.push(MorseElement::WordGap);
}
}
result
}
}
#[derive(Debug, Clone, Copy)]
enum MorseElement {
Dot,
Dash,
ElementGap,
LetterGap,
WordGap,
}
fn get_morse_map() -> HashMap<char, &'static 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', "--.."),
('1', ".----"),
('2', "..---"),
('3', "...--"),
('4', "....-"),
('5', "....."),
('6', "-...."),
('7', "--..."),
('8', "---.."),
('9', "----."),
('0', "-----"),
]
.iter()
.cloned()
.collect()
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_morse_generation() {
let generator = MorseGenerator::new(12000, 600.0, 20.0);
let result = generator.generate_wav_file("SOS", "test_sos.wav");
assert!(result.is_ok());
// Clean up test file
std::fs::remove_file("test_sos.wav").ok();
}
}
|
