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Realtime Computation of a VST Audio Effect Plugin on the Graphics Processor

Wolfgang Fohl, Julian Dessecker
HAW Hamburg, University of Applied Sciences, Hamburg, Germany
The Third International Conference on Creative Content Technologies, CONTENT 2011, 2011

@inproceedings{fohl2011realtime,

   title={Realtime Computation of a VST Audio Effect Plugin on the Graphics Processor},

   author={Fohl, W. and Dessecker, J.},

   booktitle={CONTENT 2011, The Third International Conference on Creative Content Technologies},

   pages={58–62},

   year={2011}

}

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A plugin system for GPGPU real time audio effect calculation on the graphics processing unit of the computer system is presented. The prototype application is the rendering of mono audio material with head-related transfer functions (HRTFs) to create the impression of a sound source located in a certain direction relative to the listener’s head. The virtual source location can be controlled in realtime. Since HRTFs are measured only for certain incident angles, a interpolation for intermediate angles has to be performed in realtime. Plugins are implemented using the VST software development kit offered by Steinberg Media Technologies. Two GPU processing frameworks for a NVIDIA graphics processor were evaluated: CUDA and OpenCL. The overall processing speed can be increased by the factor 2.2 with the GPGPU modules. When calculating the FIR filter outputs by fast convolution on the GPU, the processing speed can even be increased by the factor ten.
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