RoomAcoustiCpp

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# RoomAcoustiC++: Real-time Acoustics Library

## Description
RoomAcoustiC++ (RAC) is a C++ library for real-time room acoustic modelling.
At a high level it consists of a combined image edge ([IE](https://doi.org/10.1051/aacus/2021010)) and feedback delay network (FDN) models that can be applied to an arbitrary triangulated mesh.
This repo includes visual studio projects for building a DLL (windows) or SO (linux/android) library that can be interfaced from other applications.

The official documentation of RoomAcoustiC++, including the Unity Engine interface is available here [https://roomacousticpp.readthedocs.io/en/latest/](https://roomacousticpp.readthedocs.io/en/latest/).

## Capabilities
* 6 degrees of freedom for the source and receiver
* Dynamic geometry (if single-FDN late reverb is used)
* Binaural spatialisation including custom HRTFs
* Non-shoebox rooms
* Geometry dependent early reflections
* Diffraction modelling
* FDN late reverberation (two models available)

## Acoustic model
The IE model configuration is user controlled.
This includes toggling direct sound, reflection, diffraction, diffracted reflection paths, late reverberation and setting the maximum reflection/diffraction order of the model.
Multiple diffraction models are implemented including: Biot-Tolstoy-Medwin ([BTM](https://doi.org/10.1121/1.428071)), Uniform Theory of Diffraction ([UTD](https://doi.org/10.1109/PROC.1974.9651)), Neural network model ([NN-IIR](https://doi.org/10.17743/jaes.2022.0107)) and Universal Diffraction FIlter Approximation ([UDFA](https://doi.org/10.1109/TASLP.2023.3264737)).
Two different models are provided for late reverberation, both based on FDNs.
The first late reverberation model (SingleFDN) is based on the RAZR model proposed by Wendt et al. with modifications to support diffraction and non-shoebox rooms.
The second late reverberation model (RAVES) is based on the MoD-ART model proposed by Scerbo et al..
It is based on precomputed data generated by [analyzing the acoustic environment](https://github.com/IoSR-Surrey/MoD-ART/).

## Citable references
First publication released alongside [version 1](https://github.com/jmannall/RoomAcoustiCpp/releases/tag/v1.0.1) describing the architecture of RAC, its main features, and analysis of accuracy and real-time performance:
* Mannall J., Savioja L., Neidhardt A., Mason R. and De Sena E. "RoomAcoustiC++: An open-source room acoustic model for real-time audio simulations,” in Proc. AES Int. Conf. on Headphone Tech., Espoo, Finland, 2025. [https://aes2.org/publications/elibrary-page/?id=22932](https://aes2.org/publications/elibrary-page/?id=22932)

## Additional tools
In addition to this main repository, there are other repositories with associated tools:
* RoomAcoustiCpp-Unity: Modular C# scripts and resources for straight foward integration of RAC with the Unity Engine. Code available at: [https://github.com/jmannall/RoomAcoustiCpp-Unity](https://github.com/jmannall/RoomAcoustiCpp-Unity)

## Credits
The software is being developed by
* [Joshua Mannall](https://github.com/jmannall) ([Institute of Sound Recording, University of Surrey](https://iosr.surrey.ac.uk/)). Contact: jmannall@outlook.com
* [Matteo Scerbo](https://github.com/Matteo-Scerbo) ([Department of Electrical and Photonics Engineering, Technical University of Denmark](https://dtu.dk/)). Contact: mattes@dtu.dk
* [Daniel Sass](https://github.com/twindan). Contact: dan@sass.org
* [Enzo De Sena](https://github.com/enzodesena) ([Institute of Sound Recording, University of Surrey](https://iosr.surrey.ac.uk/)). Contact: e.desena@surrey.ac.uk
* [Randall Ali](https://github.com/randyaliased) ([Institute of Sound Recording, University of Surrey](https://iosr.surrey.ac.uk/)). Contact: r.ali@surrey.ac.uk

## Aknowledgements
The project utilises the [3D-TuneIn Toolkit](https://github.com/3DTune-In/3dti_AudioToolkit) (3DTI) for binaural processing.
The forked 3dti_AudioToolkit repository (included as a submodule) includes all the required files for use with RAC.
Some small changes have been made for the purposes of compatibility between the source files.

The lock-free queue [concurrentqueue](https://github.com/cameron314/concurrentqueue) is used for multithreaded audio processing.

## License
RoomAcoustiC++ is distributed under the terms of the GNU Lesser General Public License version 3 (LGPL-3.0-only).

If you use, redistribute, or modify RoomAcoustiCpp under LGPL-3.0-only, there is no license fee or signed license agreement required: you just need to comply with the LGPL-3.0-only terms and conditions. See [ROOMACOUSTICPP_LICENSE](ROOMACOUSTICPP_LICENSE) and [LICENSE](LICENSE) for further information.

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