Real-time analysis

Playing around with on-board audio capture, analysis, and visualization in python.

Requirements

• Mac osx
• Homebrew
• Python >=3.6
• iShowU Audio Capture (see below)

Setup

On mac with homebrew installed:

• brew install portaudio
• python3 -m venv venv
• source venv/bin/activate
• pip install -r requirements.txt

Next install iShowU Audio Capture and setup a virtual audio route:

• Follow the install instructions from the latest release
  • Be sure to allow the developer in your security preferences in the last step, this is a second allow after entering your password in the .pkg install
• Open the native mac app Audio MIDI Setup
• Click the + in the bottom left corner
• Setup your new audio route by clicking the checkboxes next to iShowU and Built-in Output
  • If you don't see iShowU then something went wrong in the install process
  • Make sure to select drift correction for both sources
  • Make sure both sources are at the same sample rate by switching the master device, this script assumes 96.0 kHz
  • Your final master device should be built-in output
  • Optionally rename the new virtual audio route to something recognizable like loopback
• After your iShowU loopback is created set the INPUT_DEVICE_INDEX in config.py
  • Run python helpers.py to list your device indexes

To Run

cd rta/src

python run.py

Play some music ^.^

Resources

• PyGame drawing basics
• PyGame documentation home
• Forum thread on PyGame drawing efficiency