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// Copyright (C) 2024 Tomasz Kramkowski <tomasz@kramkow.ski>
// SPDX-License-Identifier: GPL-3.0-or-later
use std::{
env,
f64::consts,
io::{self, Write},
process,
};
type Float = f64;
const RATE: f64 = 8000.0;
#[derive(Debug, Copy, Clone)]
struct Beep {
frequency: Float,
volume: Float,
}
impl Beep {
fn new(frequency: Float, volume: Float) -> Self {
Self { frequency, volume }
}
fn sample_at(&self, time: Float) -> Float {
Float::sin(time * consts::TAU * self.frequency) * self.volume
}
}
#[derive(Copy, Clone)]
struct Beat<'a> {
beep: Beep,
start: Float,
duration: Float,
interval: Float,
mask: &'a dyn Fn(Float) -> bool,
}
impl<'a> Beat<'a> {
fn new(
beep: Beep,
start: Float,
duration: Float,
interval: Option<Float>,
mask: Option<&'a dyn Fn(Float) -> bool>,
) -> Self {
Self {
beep,
start,
duration,
interval: interval.unwrap_or(Float::INFINITY),
mask: mask.unwrap_or(&|_| true),
}
}
fn rel_time(&self, time: Float) -> Float {
(time - self.start) % self.interval
}
fn plays_now(&self, time: Float) -> bool {
(self.mask)(time) && time > self.start && self.rel_time(time) < self.duration
}
fn sample_at(&self, time: Float) -> Float {
self.beep.sample_at(self.rel_time(time))
}
}
fn sample_at(beats: &[Beat<'_>], time: Float) -> Float {
let mut sample = 0.0;
for beat in beats {
if beat.plays_now(time) {
sample += beat.sample_at(time)
}
}
sample
}
fn main() {
let mut args = env::args();
// This is bugged, argv[0] is empty if you exec with an empty or no argv
let argv0 = args.next().expect("No argv0");
let (Some(duration), None) = (args.next(), args.next()) else {
eprintln!("Usage: {argv0} duration");
process::exit(1);
};
let duration: Float = duration.parse().expect("Invalid duration");
let mut stdout = io::stdout();
let endstop = |s| s < duration - 1.0;
let beats = [
Beat::new(Beep::new(500.0, 0.5), 0.0, 0.1, Some(30.0), Some(&endstop)),
Beat::new(Beep::new(500.0, 0.5), 14.9, 0.1, Some(30.0), Some(&endstop)),
Beat::new(Beep::new(600.0, 0.5), 15.0, 0.1, Some(30.0), Some(&endstop)),
Beat::new(Beep::new(600.0, 0.5), -0.1, 0.1, Some(30.0), Some(&endstop)),
Beat::new(
Beep::new(300.0, 0.3),
1.45,
0.1,
Some(3.0),
Some(&|s| (s / 15.0) as u64 % 2 == 0),
),
Beat::new(
Beep::new(1000.0, 0.4),
299.95,
0.05,
Some(300.0),
Some(&endstop),
),
Beat::new(
Beep::new(1000.0, 0.4),
300.05,
0.05,
Some(300.0),
Some(&endstop),
),
Beat::new(Beep::new(400.0, 0.5), duration + 0.0, 0.4, None, None),
Beat::new(Beep::new(500.0, 0.5), duration + 0.45, 0.4, None, None),
Beat::new(Beep::new(600.0, 0.5), duration + 0.9, 0.4, None, None),
];
let start = -0.1;
let end = duration + 1.4;
for sample_index in 0..((RATE * (end - start)) as u64) {
let time = start + sample_index as Float / RATE;
let sample = sample_at(&beats, time);
stdout
.write_all(&[((sample + 1.0) / 2.0 * 256.0).floor().clamp(0.0, 255.0) as u8])
.expect("Could not write sample");
}
}
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