Digital Filtering in Faust and PD

This appendix describes use of the Faust programming language^K.1by Yann Orlarey [61,31] to generate real-time DSP plugins from a high-level specification. In addition to generating efficient inner loops, Faust supports Graphical User Interface (GUI) specification in the source code, and can emit code for various application and plugin environments.^K.2 Moreover, Faust can generate easy-to-read block diagrams directly from the source, illustrating signal flow and processing graphically. This appendix focuses on generating pd, LADSPA, and VST plugins from a simple Faust program specifying a resonator driven by white noise.

The software discussed in this appendix can be downloaded as a compressed tarball:

http://ccrma.stanford.edu/~jos/faust/faustpd.tar.gz

Additional software and more advanced examples can be found in [85].

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Subsections

• A Simple Faust Program
• Generating Faust Block Diagrams
• Testing a Faust Filter Section
• A Look at the Generated C++ code
• Generating a Pure Data (PD) Plugin
  • Generating the PD Plugin
  • Generating a PD Plugin-Wrapper Abstraction
  • A PD Test Patch for the Plugin Wrapper
  
  
• Generating a LADSPA Plugin via Faust
• Generating a VST Plugin via Faust
  • Bypassing Windows
  
  
• Generating a MIDI Synthesizer for PD
• MIDI Synthesizer Test Patch

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About the Author: Julius Orion Smith III
Julius Smith's background is in electrical engineering (BS Rice 1975, PhD Stanford 1983). He is presently Professor of Music and Associate Professor (by courtesy) of Electrical Engineering at Stanford's Center for Computer Research in Music and Acoustics (CCRMA), teaching courses and pursuing research related to signal processing applied to music and audio systems. See http://ccrma.stanford.edu/~jos/ for details.