You're seeing just the callback handle_other, go back to Membrane.Element.Base module for more information.
Link to this callback

handle_other(message, context, state)

View Source (optional)


  message :: any(),
  context :: Membrane.Element.CallbackContext.Other.t(),
  state :: Membrane.Element.state_t()
) :: callback_return_t()

Callback invoked when element receives a message that is not recognized as an internal membrane message.

Useful for receiving ticks from timer, data sent from NIFs or other stuff.