esphome/tests/components/speaker/common.yaml

esphome:
  on_boot:
    then:
      - speaker.mute_on:
      - speaker.mute_off:
      - if:
          condition: speaker.is_stopped
          then:
            - speaker.play: [0, 1, 2, 3]
      - speaker.volume_set: 0.9
      - if:
          condition: speaker.is_playing
          then:
            - speaker.finish:
      - speaker.stop:

i2s_audio:
  i2s_lrclk_pin: ${i2s_bclk_pin}
  i2s_bclk_pin: ${i2s_lrclk_pin}
  i2s_mclk_pin: ${i2s_mclk_pin}
  use_legacy: true

speaker:
  - platform: i2s_audio
    id: speaker_id
    dac_type: external
    i2s_dout_pin: ${i2s_dout_pin}