Resonance Audio abandoned

Microsoft Spatializer

Unity

A cross-platform spatializer plugin that integrates spatial audio processing into Unity projects. The plugin uses efficient DSP algorithms to render head-related transfer functions (HRTF) for immersive 3D audio positioning. Designed to fit Unity's audio engine architecture, it supports both Windows and Android platforms. Version 2.0 represents a complete rewrite focused on performance optimization and cross-platform compatibility. The plugin uses a multi-source mixer architecture that reduces CPU overhead compared to previous implementations. While an older HoloLens 2-specific version (v1) offered hardware DSP offload, the current version prioritizes flexibility and integration with Unity's audio pipeline. Note: the GitHub repository was archived (made read-only) in July 2024 and is no longer actively developed, though it remains usable for existing projects. It enables realistic directional audio cues essential for VR, AR, and immersive gaming experiences.

Resonance Audio for Wwise

Wwise

Resonance Audio for Wwise is a plugin package that integrates Google's spatial audio engine into the Wwise authoring and runtime pipeline. It provides two plugins: a Renderer that spatializes sound sources binaurally via Wwise's Ambisonic bus pipeline (supporting up to third-order Ambisonics), and a Room Effects plugin that simulates early reflections and late reverberation based on parametric room geometry. The integration targets desktop (Windows, macOS, Linux) and mobile (Android, iOS) platforms. You set up an Ambisonic audio bus in Wwise Authoring, attach the Resonance Audio Renderer as a mixer plugin, and route sound sources through it. Room effects are applied per-source, letting you vary acoustic character across game spaces without baking impulse responses. Requires Wwise 2017.1.0.6302 or newer. This is useful when you need consistent, cross-platform binaural output from Wwise without relying on platform-native spatial audio APIs.

libmysofa

Standalone

libmysofa is a C library for reading and processing Head-Related Transfer Function (HRTF) data stored in AES SOFA files conforming to the AES69-2015 standard. It provides functions to load SOFA files, extract HRTF filters for specific spatial coordinates, and convert between Cartesian and spherical coordinate systems. The library handles automatic normalization of HRTF data, nearest-neighbor interpolation for arbitrary listener positions, and efficient caching of multiple SOFA files. It supports both integer and floating-point filter extraction with configurable sample rates and neighbor search parameters. Designed for integration into spatial audio engines and renderers, libmysofa offers both simple and advanced APIs for developers who need direct access to HRTF data without implementing SOFA parsing from scratch.

Omnitone

Standalone

Omnitone is a Web Audio API implementation of ambisonic decoding and binaural rendering. It supports first-order (4-channel) and higher-order ambisonic streams (2nd and 3rd order, up to 16 channels). The library uses native Web Audio nodes for performance-critical processing, ensuring efficient CPU usage. The implementation follows the Google spatial media specification and uses SADIE binaural filters for rendering. It accepts input from HTML media elements or multichannel AudioBufferSourceNodes, with support for dynamic rotation matrices to orient the sound field in response to user interaction or sensor data. Omnitone powers the Resonance Audio SDK for web and provides both ambisonic and bypass rendering modes. The library is designed for browser-based spatial audio applications, VR experiences, and 360-degree video playback. Note: the last release (v1.3.0) was in January 2019, so the project is effectively dormant.