Other

SR WLED interfacing

• https://github.com/netmindz/WLED-sync

FFT related

• https://www.instructables.com/Faster-Than-the-Fastest-FFT-for-Arduino/
• https://github.com/espressif/esp-dsp/blob/master/docs/esp-dsp-benchmarks.rst
• The fastest thing for Arduino seems to be an assembly version of the "fast Hartley transform" (FHT) by openmusiclabs: http://wiki.openmusiclabs.com/wiki/ArduinoFHT

Audio processing

• Musical Analysis: https://github.com/creaktive/pianolizer

audio drivers

ES8388

• Raw: https://github.com/thaaraak/ESP32-ES8388/blob/master/main/main.c
• Minimal library: https://github.com/perlix/es8388arduino/blob/main/example/i2sLoopback/i2sLoopback.ino
• AudioKit: https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/examples-stream/streams-i2s-i2s/streams-i2s-i2s.ino
• Espressif Audio Development Framework (ADF): https://github.com/espressif/esp-adf/