# `Membrane.Element.CallbackContext`
[🔗](https://github.com/membraneframework/membrane-core/blob/v1.2.7/lib/membrane/element/callback_context.ex#L1)

Describes context passed to the Membrane Element callbacks.

# `t`

```elixir
@type t() :: %{
  :clock => Membrane.Clock.t() | nil,
  :module => module(),
  :name => Membrane.Element.name(),
  :pads => %{required(Membrane.Pad.ref()) => Membrane.Element.PadData.t()},
  :parent_clock => Membrane.Clock.t() | nil,
  :playback => Membrane.Playback.t(),
  :resource_guard => Membrane.ResourceGuard.t(),
  :utility_supervisor => Membrane.UtilitySupervisor.t(),
  optional(:incoming_demand) => non_neg_integer(),
  optional(:pad_options) => map(),
  optional(:old_stream_format) => Membrane.StreamFormat.t(),
  optional(:start_of_stream_received?) => boolean()
}
```

Type describing context passed to the Membrane Element callbacks.

Field `:incoming_demand` is present only in
`c:Membrane.Element.WithOutputPads.handle_demand/5`.

Field `:pad_options` is present only in `c:Membrane.Element.Base.handle_pad_added/3`
and `c:Membrane.Element.Base.handle_pad_removed/3`.

Field `:start_of_stream_received?` is present only in
`c:Membrane.Element.WithInputPads.handle_end_of_stream/3`.

Field `:old_stream_format` is present only in
`c:Membrane.Element.WithInputPads.handle_stream_format/4`.

---

*Consult [api-reference.md](api-reference.md) for complete listing*