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Membrane Multimedia Framework (Core)
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lib/membrane/element/callback_context/caps.ex
defmodule Membrane.Element.CallbackContext.Caps do
@moduledoc """
Structure representing a context that is passed to the element when receiving
information about new caps for given pad.
The `old_caps` field contains caps previously present on the pad, and is equal
to `pads[pad].caps` field.
"""
alias Membrane.Core.Element.PadModel
use Membrane.Element.CallbackContext,
old_caps: Membrane.Caps.t()
@impl true
defmacro from_state(state, args) do
old_caps =
quote do
unquote(state) |> PadModel.get_data!(unquote(args[:pad]), :caps)
end
super(state, old_caps: old_caps)
end
end