Fade Home Assistant media player entity with the lights

fade_media_with_lights-1.0.yaml

blueprint:
  name: Fade Media Player Volume Based on Light
  description: Adjusts the volume of a media player based on the state of a light.
  domain: automation
  input:
    light_entity:
      name: Light Entity
      description: The light entity to monitor.
      selector:
        entity:
          domain: light
    media_player_entity:
      name: Media Player Entity
      description: The media player to control.
      selector:
        entity:
          domain: media_player
    volume_save_helper:
      name: Volume Save Helper
      description: Input Number helper for saving volume state (0.01 step size.)
      selector:
        entity:
          domain: input_number
    fade_duration:
      name: Fade Duration
      description: Duration of the volume fade in seconds.
      default: 2
      selector:
        number:
          min: 1
          max: 60
          unit_of_measurement: seconds
    fade_curve:
      name: Fade Curve
      description: The type of curve for the volume fade.
      default: bezier
      selector:
        select:
          options:
            - linear
            - bezier
            - logarithmic

alias: Fade Media Player Volume Based on Light
description: ""
trigger:
  - platform: state
    entity_id: !input light_entity
    from: null
    to: "on"
    id: light_on
  - platform: state
    entity_id: !input light_entity
    from: null
    to: "off"
    id: light_off
    for:
      hours: 0
      minutes: 0
      seconds: 5
condition: []
variables:
  steps_per_second: 10
  target_player: !input media_player_entity
  save_helper: !input volume_save_helper
  duration: !input fade_duration
  curve: !input fade_curve
  target_volume: >-
    {% if( trigger.id == "light_off" ) %}
      0
    {% elif( trigger.id == "light_on" and ( ( state_attr( target_player,
    'volume_level')|float(0)) < 0.01 )) %}
      {{ states( save_helper ) }}
    {% else %}
      {{ state_attr( target_player, 'volume_level')|float(0) }}
    {% endif %}
  total_steps: "{{ (steps_per_second * duration) | int(0) }}"
  start_volume: "{{ state_attr(target_player, 'volume_level') | float(0) }}"
  start_diff: "{{ (target_volume - start_volume) | float(0) }}"
action:
  - choose:
      - conditions:
          - condition: template
            value_template: "{{ state_attr( target_player, 'volume_level')|float(0) > 0 }}"
          - condition: template
            value_template: "{{ trigger.id == 'light_off' }}"
        sequence:
          - service: input_number.set_value
            data:
              value: "{{ state_attr( target_player, 'volume_level')|float(0)}}"
            target:
              entity_id: "{{ save_helper }}"
  - repeat:
      while:
        - condition: template
          value_template: "{{ repeat.index < total_steps }}"
        - condition: template
          value_template: >-
            {{ (((state_attr(target_player, "volume_level") |float(0)) -
            target_volume) | abs) > 0.001 }}
      sequence:
        - service: media_player.volume_set
          data_template:
            entity_id: "{{ target_player }}"
            volume_level: >
              {% set t = repeat.index / total_steps %}  {% if curve ==
              'logarithmic' %}
                {{ (start_volume + (t / (1 + (1 - t))) * start_diff) | float(0) }}
              {% elif curve == 'bezier' %}
                {{ (start_volume + (t * t * (3 - 2 * t)) * start_diff) | float(0) }}
              {% else %}
                {{ (start_volume + t * start_diff) | float(0) }}
              {% endif %}
        - delay: "00:00:00.1"
  - service: media_player.volume_set
    data_template:
      entity_id: "{{ target_player }}"
      volume_level: "{{ target_volume }}"
    enabled: true
mode: restart