Steam Audio
Valve Corporation
Steam Audio is a free, open-source cross-platform spatial-audio toolkit developed by Valve. It provides HRTF-based 3D positional audio (with custom-SOFA-file support), Ambisonic spatialisation, physics-based sound propagation modelling occlusion / transmission / reflections / pathing, automated reverb baking based on scene geometry, hybrid reverb for large spaces, and dynamic geometry support. Distributed as integrations for Unity (2017.3+), Unreal Engine (4.27+), FMOD Studio (2.0+), Wwise (2023
History & Background
Developed by Valve Corporation. The complete source code (core SDK and all integration plug-ins) was open-sourced under Apache 2.0 with the v4.5.2 release; previously the core SDK was closed-source while the integration plug-ins were already open. Source code is hosted at github.com/ValveSoftware/steam-audio.