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Membrane Multimedia Framework (Core)

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membrane_core lib membrane core element state.ex
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lib/membrane/core/element/state.ex 

defmodule Membrane.Core.Element.State do

  @moduledoc false

  # Structure representing state of an Core.Element. It is a part of the private API.

  # It does not represent state of elements you construct, it's a state used

  # internally in Membrane.



  use Membrane.Log, tags: :core

  alias Membrane.{Core, Element}

  alias Core.{Playback, Playbackable}

  alias Core.Element.{PadModel, PadSpecHandler, PlaybackBuffer}

  alias Element.Pad

  alias Bunch.Type

  alias __MODULE__, as: ThisModule

  require Pad

  use Bunch.Access



  @type stateful_t(value) :: Type.stateful_t(value, t)

  @type stateful_try_t :: Type.stateful_try_t(t)

  @type stateful_try_t(value) :: Type.stateful_try_t(value, t)



  @type t :: %__MODULE__{

          module: module,

          type: Element.type_t(),

          name: Element.name_t(),

          internal_state: Element.state_t() | nil,

          pads: PadModel.pads_t() | nil,

          watcher: pid | nil,

          controlling_pid: pid | nil,

          parent_monitor: reference() | nil,

          playback: Playback.t(),

          playback_buffer: PlaybackBuffer.t(),

          delayed_demands: %{{Pad.ref_t(), :supply | :redemand} => :sync | :async}

        }



  defstruct [

    :module,

    :type,

    :name,

    :internal_state,

    :pads,

    :watcher,

    :controlling_pid,

    :parent_monitor,

    :playback,

    :playback_buffer,

    :delayed_demands

  ]



  defimpl Playbackable, for: __MODULE__ do

    use Playbackable.Default

    def get_controlling_pid(%ThisModule{controlling_pid: pid}), do: pid

  end



  @doc """

  Initializes new state.

  """

  @spec new(module, Element.name_t(), reference() | nil) :: t

  def new(module, name, parent_monitor \\ nil) do

    %__MODULE__{

      module: module,

      type: apply(module, :membrane_element_type, []),

      name: name,

      internal_state: nil,

      pads: nil,

      watcher: nil,

      controlling_pid: nil,

      parent_monitor: parent_monitor,

      playback: %Playback{},

      playback_buffer: PlaybackBuffer.new(),

      delayed_demands: %{}

    }

    |> PadSpecHandler.init_pads()

  end

end