Membrane.AAC.channel_config_id_to_channels

You're seeing just the function channel_config_id_to_channels, go back to Membrane.AAC module for more information.
Link to this function

channel_config_id_to_channels(channel_config_id)

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Specs

channel_config_id_to_channels(channel_config_id_t()) ::
  {:ok, pos_integer() | :AOT_specific}