RtAudio-rs

Safe Rust wrapper and bindings for RtAudio (version 6).

Usage Example

use rtaudio::{Api, Buffers, DeviceParams, SampleFormat, StreamInfo, StreamOptions, StreamStatus};

fn main() {
    let host = rtaudio::Host::new(Api::Unspecified).unwrap();
    let out_device = host.default_output_device().unwrap();

    let mut stream_handle = host
        .open_stream(
            Some(DeviceParams {
                device_id: out_device.id,
                num_channels: 2,
                first_channel: 0,
            }),
            None,
            SampleFormat::Float32,
            out_device.preferred_sample_rate,
            256,
            StreamOptions::default(),
            |error| eprintln!("{}", error),
        )
        .unwrap();

    let mut phasor = 0.0;
    let phasor_inc = 440.0 / stream_handle.info().sample_rate as f32;

    stream_handle
        .start(
            move |buffers: Buffers<'_>, _info: &StreamInfo, _status: StreamStatus| {
                if let Buffers::Float32 { output, input: _ } = buffers {
                    // By default, buffers are interleaved.
                    for frame in output.chunks_mut(2) {
                        // Generate a sine wave at 440 Hz at 50% volume.
                        let val = (phasor * std::f32::consts::TAU).sin() * 0.5;
                        phasor = (phasor + phasor_inc).fract();

                        frame[0] = val;
                        frame[1] = val;
                    }
                }
            },
        )
        .unwrap();

    // Wait 3 seconds before closing.
    std::thread::sleep(std::time::Duration::from_millis(3000));
}

Prerequisites

CMake is required on all platforms.

Linux

apt install cmake pkg-config libasound2-dev libpulse-dev

If the jack_linux feature is enabled, then also install the jack development headers:

apt install libjack-dev

MacOS

Install CMake: Option 1

Download at https://cmake.org/.

Install CMake: Option 2

Install with Homebrew:

brew install cmake

Windows

Install CMake

Download at https://cmake.org/.

Features

By default, Jack on Linux and ASIO on Windows is disabled. You can enable them with the jack_linux and asio features.

rtaudio = { version = "0.3.2", features = ["jack_linux", "asio"] }

Notes

Bindings were made from the official C header. No bindings to the C++ interface are provided.

This currently builds a static library from source on all platforms. Once RtAudio version 6 is commonly available in Linux package managers I might change it to link to the dynamic library on Linux.

I haven't figured out how to get Jack on MacOS to work yet. If you know how to install and link the Jack libraries on MacOS, please let me know.

I haven't thoroughly tested every API on every platform yet. If you run into any bugs or issues with building, please create an issue.