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Membrane Multimedia Framework (Core)
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lib/membrane/core/component.ex
defmodule Membrane.Core.Component do
@moduledoc false
@type state_t ::
Membrane.Core.Pipeline.State.t()
| Membrane.Core.Bin.State.t()
| Membrane.Core.Element.State.t()
@spec action_handler(state_t) :: module
[Pipeline, Bin, Element]
|> Enum.map(fn component ->
def action_handler(%unquote(Module.concat([Membrane.Core, component, State])){}),
do: unquote(Module.concat([Membrane.Core, component, ActionHandler]))
end)
defmacro callback_context_generator(restrict, module, state, args \\ []) do
module = Macro.expand(module, __ENV__)
restrict =
case restrict do
:parent -> [Pipeline, Bin]
:child -> [Bin, Element]
:any -> [Pipeline, Bin, Element]
restrict -> restrict
end
requires =
restrict
|> Enum.map(fn component ->
quote do
require unquote(context(component, module))
end
end)
clauses =
restrict
|> Enum.flat_map(fn component ->
quote do
%unquote(state(component)){} ->
&unquote(context(component, module)).from_state(&1, unquote(args))
end
end)
quote do
unquote_splicing(requires)
unquote({:case, [], [state, [do: clauses]]})
end
end
defp context(component, module),
do: Module.concat([Membrane, component, CallbackContext, module])
defp state(component), do: Module.concat([Membrane.Core, component, State])
end