cpal/examples/beep.rs

32 lines
837 B
Rust

extern crate cpal;
fn main() {
let mut channel = cpal::Channel::new();
// producing a sinusoid
let mut data_source =
std::iter::iterate(0.0f32, |f| f + 0.03)
.map(|angle| {
use std::num::FloatMath;
use std::num::Int;
let angle = angle.sin();
let max: u16 = Int::max_value();
let value = (max as f32 / 2.0) + (angle * (max as f32 / 2.0));
value as u16
});
loop {
let mut buffer = channel.append_data();
for sample in buffer.chunks_mut(4) {
let value = data_source.next().unwrap();
let mut writer = std::io::BufWriter::new(sample);
writer.write_le_u16(value).unwrap();
writer.write_le_u16(value).unwrap();
}
}
}