developers.home-assistant/docs/entity_media_player.md

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Media Player Entity	Media Player

This entry is incomplete. Contribution welcome.

Properties

Properties should always only return information from memory and not do I/O (like network requests). Implement update() or async_update() to fetch data.

Name	Type	Default	Description
sound_mode	string	None	The current sound mode of the media player
sound_mode_list	list	None	Dynamic list of available sound modes (set by platform, empty means sound mode not supported)

Methods

Select sound mode

Optional. Switch the sound mode of the media player.

class MyMediaPlayer(MediaPlayerDevice):
  # Implement one of these methods.
  
  def select_sound_mode(self, sound_mode):
      """Switch the sound mode of the entity."""

  def async_select_sound_mode(self, sound_mode):
     """Switch the sound mode of the entity."""