RPi Audio Visualizer

Visualize the spectrum of an audio stream in real time.

Hardware

• Raspberry Pi 4
• Playstation Eye (only using the mic)
• 64x64 RGB LED Matrix
• Adafruit RGB Matrix Bonnet for Raspberry Pi

Software

• Boost
  • headers
  • thread
  • chrono
  • program_options
• PortAudio
• FFTW and FFTW++
• rpi-rgb-led-matrix

Building and running

• Run cmake . from the root of the project.
• Change directories to bin/ and run make visualizer.
• Run build/visualizer with sudo. Command line options:

Allowed options:
  --help                            produce help message
  --speed arg (=8)                  set the visualizer's animation speed (must 
                                    be a power of 2 in range [2, 64])
  --buffer-size arg (=512)          set the size of the audio buffer, which 
                                    also determines the FFT length (allowed 
                                    values: 256, 512, 1024, 2048)
  --pre-emphasis arg (=0.899999976) set the pre-emphasis factor

Examples

Check out video_examples/ to see the visualizer in action.