ambisonic

Compose and play 3D audio.

The ambisonic library provides 3D sound scene support on top of rodio. It allows positioning and moving sound sources freely in 3D space around a virtual listener, and playing the resulting spatial mix in real-time over a sound card.

Features:

• Realistic directional audio
• Take rodio sound sources and place them in space
• Doppler effect on moving sounds

Usage Example

```rust use std::thread::sleep; use std::time::Duration; use ambisonic::{rodio, AmbisonicBuilder};

let scene = AmbisonicBuilder::default().build();

let source = rodio::source::SineWave::new(440); let mut sound = scene.play_at(source, [50.0, 1.0, 0.0]);

// move sound from right to left sound.setvelocity([-10.0, 0.0, 0.0]); for i in 0..1000 { sound.adjustposition([50.0 - i as f32 / 10.0, 1.0, 0.0]); sleep(Duration::frommillis(10)); } sound.setvelocity([0.0, 0.0, 0.0]); ```

Technical Details

ambisonic is built around the concept of an intermediate representation of the sound field, called B-format. The B-format describes what the listener should hear, independent of their audio playback equipment. This leads to a clear separation of audio scene composition and rendering. For details, see Wikipedia.

In its current state, the library allows spatial composition of single-channel rodio sources into a first-order B-format stream. The chosen renderer then decodes the B-format stream into audio signals for playback.

Currently, the following renderers are available:

• Stereo: simple and efficient playback on two stereo speakers or headphones
• HRTF: realistic 3D sound over headphones using head related transfer functions

Although at the moment only stereo output is supported, the B-format abstraction should make it easy to implement arbitrary speaker configurations in the future.