use esp-dsp

[stas-sl]

optimized version for ESP32 works quite fast improving performance ~2x times for ~65 SOS, though it uses direct form 2 (not transposed) which is considered less numerically stable than transposed one, but I'm not sure how it important here

and you need these modifications in config to make it compile:

esphome:
  platformio_options:
    board_build.esp-idf.preserve_source_file_extension: "yes"
    build_unflags:
      - -Werror=all

esp32:
  board: esp32dev
  framework:
    type: esp-idf
    sdkconfig_options:
      CONFIG_ESP32_DEFAULT_CPU_FREQ_240: y
      CONFIG_COMPILER_OPTIMIZATION_SIZE: n
      CONFIG_COMPILER_OPTIMIZATION_PERF: y
    components:
      - name: esp-dsp
        source: github://espressif/esp-dsp