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Plugging VSTs into Python

This document outlines the integration of VST (Virtual Studio Technology) plugins into Python using the `nosuch.vstutil` module. It covers audio device manipulation, VST plugin interaction, and includes example code for applications like Radio Free Quasar. Explore how to utilize audio snippets, synths, and effects through Python, harnessing classes such as `AudioSnippet`, `AudioLoop`, and `VstPlugin`. Additionally, discover practical implementation details using PortAudio and libsndfile. Ideal for music programmers and audio developers.

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Plugging VSTs into Python

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  1. Plugging VSTs into Python Tim Thompson tjt@nosuch.com

  2. Outline • nosuch.vstutil – a Python module for manipulating: • audio devices • audio snippets • VST plugins • Example code • Example art – Radio Free Quasar • Example instrument – w/multitouch and graphics

  3. Classes in nosuch.vstutil • AudioSnippet • init parameters: filename or audiodata • methods: duration, stretch • AudioLoop • init parameters: snippet, offset, length, loops • methods: restart, setlength, setoffset • PaAudioDevice • methods: abort, attach, close, is_active, open, reset_reduction, start, stop

  4. Classes in nosuch.vstutil • VstPlugin • init parameters: dll • methods: can_receive_midi, is_synth, is_vst2, name, num_inputs, num_outputs, num_params, num_programs, param_label, param_display, param_name, program_name, send_midi, get_enable, set_enable, set_param, set_program, set_input

  5. Implementation details • Portaudio • provides audio device interface • libsndfile.dll • provides sound file reading • pyrex • generates python/C interface code

  6. Basic use of VstPlugin • Instantiate it: v = VstPlugin(dll="ringmod.dll") • Connect its input to the output of other plugins v.setinput(v2) • Randomize its parameters n = v.num_params() for i in range(n): v.set_param(i,random())

  7. Looping and playing sound #!/usr/bin/env python import time import nosuch.vstutil import sys a = PaAudioDevice() sound = AudioSnippet(filename="winsound1.wav") loop1 = AudioLoop(sound1,loops=-1) # loop forever a.open() a.start() a.attach(loop1) time.sleep(10) # sound is heard a.stop() a.close() sys.exit(0)

  8. Connecting a VST synth and effect effect = VstPlugin(dll="BJ Ringmodulator.dll") synth = VstPlugin(dll="StrataVar.dll") # Connect output of synth to effec effect.setinput(synth) # Open audio and connect effect’s output to it a.open() a.start() a.attach(effect) # Send random MIDI notes to synth # while randomizing parameters of both VSTs for i in range(100): time.sleep(2.0) pitch = int(random() * 128) % 128 vstrandparam(synth) vstrandparam(effect) # see next slide synth.send_midi(1,pitch,8000,80)

  9. Utility functions def vstrandparam(v): for i in range(v.numParams()): v.set_param(i,random()) def vstinfo(v): print "Is VST2 = ",v.is_vst2() print "Is synth = ",v.is_synth() print "numParams = ",v.numParams() print "numInputs = ",v.numInputs() print "numOutputs = ",v.numOutputs() print "can_receive_midi = ",v.can_receive_midi() print "can_send_midi = ",v.can_send_midi()

  10. Demos • demo1 • play VST synth through VST effect and randomize parameters • demo2 • play wave file through VST effect and randomize parameters • demo3 • play VST synth through VST effect with LFOs attached to parameters (and periodically randomize)

  11. Radio Free Quasar • Art installation for Burning Man 2004 • Antique radio • Computer generating audio • Laser generating graphics • Big knob for control

  12. Radio Free Quasar at Burning Man

  13. Radio Free Quasar

  14. Radio Free Quasar at Burning Man

  15. Radio Free Quasar at Burning Man

  16. Radio Free Quasar

  17. Radio Free Quasar – the pieces • 10 robust VST plugins chained serially • Collection of WAV files • Python program: • selects wave files • enables/disables/randomizes VST plugins • allows interactive control from keyboard • Big knob on radio sends keypresses • Automatic randomization if no user input

  18. Radio Free Quasar – hardware • Windows XP • Mini-ITX motherboard (fanless, low power) • DC power supply • Power sequencer • USB-powered speakers • USB knob (Griffin Powermate) • Laservibe laser (driven by computer’s audio output) • EL-wire antenna

  19. Radio Free Quasar – interactive control r : randomize wave file and plugin parameters w : change to a different wave file 0-9 : randomize parameters of plugin N d : disable all plugins e : enable all plugins s : save current parameters p : select previously saved parameters

  20. Throwing together VSTs, graphics, and multitouch • ergo (events routed to graphical objects) • Python-based visual performance tool • Multitouch (iGesture) pads used to draw graphics • Events from MIDI devices also trigger graphics • MIDI controller used to control graphic parameters • vstutil library creates VST synth and two effects • Multitouch pad controls notes and effects parameters • Buttons on MIDI controller can randomize parameters

  21. Other libraries of interest • nosuch.midiutil • MIDI device and data manipulation • Uses updated pyportmidi (pypm) module, which provides an interface to the portmidi library. • nosuch.fingerutil • Fingerworks iGesture (multitouch) interface

  22. Status and Availability • nosuch.vstutil • Simple packaging, Windows-only • Public domain • Downloadable at http://nosuch.com/tjt • nosuch.midiutil and nosuch.fingerutil • contact tjt@nosuch.com

  23. Plugging VSTs into Python Tim Thompson tjt@nosuch.com

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