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Membrane Multimedia Framework (Core)
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lib/membrane/core/playbackable.ex
defprotocol Membrane.Core.Playbackable do
@moduledoc false
# Protocol that has to be adopted by modules that use `Membrane.Core.Playback`.
#
# Modules that adopt `Membrane.Core.PlaybackHandler` behaviour have to store their
# playback state and controlling pid. `Membrane.Core.Playbackable` is used as
# an abstraction that allows to access those values.
alias Membrane.Core.Playback
@spec get_playback(__MODULE__.t()) :: Playback.t()
def get_playback(playbackable)
@spec set_playback(__MODULE__.t(), Playback.t()) :: __MODULE__.t()
def set_playback(playbackable, playback)
@spec update_playback(__MODULE__.t(), (Playback.t() -> Playback.t())) :: __MODULE__.t()
def update_playback(playbackable, playback)
@spec get_and_update_playback(__MODULE__.t(), (Playback.t() -> {ret, Playback.t()})) ::
{ret, __MODULE__.t()}
when ret: Playback.t() | any
def get_and_update_playback(playbackable, update_f)
@spec get_controlling_pid(__MODULE__.t()) :: pid | nil
def get_controlling_pid(playbackable)
end
defmodule Membrane.Core.Playbackable.Default do
@moduledoc false
# The default implementation for `Membrane.Core.Playbackable`.
# Assumes that `playbackable` is a map and stores `playback` and
# `controlling_pid` inside it.
defmacro __using__(_) do
quote location: :keep do
def get_playback(%{playback: playback}), do: playback
def set_playback(playbackable, playback), do: %{playbackable | playback: playback}
def update_playback(playbackable, f), do: playbackable |> Map.update!(:playback, f)
def get_and_update_playback(playbackable, f),
do: playbackable |> Map.get_and_update!(:playback, f)
def get_controlling_pid(playbackable), do: nil
defoverridable get_playback: 1,
set_playback: 2,
update_playback: 2,
get_and_update_playback: 2,
get_controlling_pid: 1
end
end
end
defimpl Membrane.Core.Playbackable, for: Any do
use Membrane.Core.Playbackable.Default
end