libspatialaudio is a C++ library for immersive spatial audio rendering, implementing Higher Order Ambisonics (HOA) up to 3rd order, object-based audio, direct speakers, and binaural output. It follows the ITU-R BS.2127-1 Audio Definition Model (ADM) and AOM IAMF specifications. The library is used in production media players like VLC for 360° video and virtual reality audio. The architecture is modular: a central `Renderer` class orchestrates per-processing blocks for encoding, decoding, rotation, zoom, binauralization, and metadata-driven panning. The codebase is cross-platform (CMake/Meson) and includes unit tests, but some components (e.g., HRTF data, psychoacoustic filters) rely on precomputed data generated by Octave scripts. While not bleeding-edge, the library is solid, well-documented, and suitable for real-time audio applications.