Sawtooth

gistfile1.txt

use portaudio as pa;
use anyhow::Result;

fn main() -> Result<()> {
    let pa = pa::PortAudio::new()?;

    let mut settings = pa.default_output_stream_settings(1, 44_100.0, 64u32)?;
    settings.flags = pa::stream_flags::CLIP_OFF;

    let mut phase = 0.0;

    let callback = move |pa::OutputStreamCallbackArgs { buffer, frames, .. }| {
        for i in 0..frames {
            buffer[i] = phase;
            phase += 0.01;
            if phase >= 1.0 {
                phase -= 2.0;
            }
        }
        pa::Continue
    };

    let mut stream = pa.open_non_blocking_stream(settings, callback)?;

    stream.start()?;

    pa.sleep(3_000);

    stream.stop()?;
    stream.close()?;

    Ok(())
}