Membrane.AAC.channels_to_channel_config_id

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

channels_to_channel_config_id(channels)

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Specs

channels_to_channel_config_id(channels :: pos_integer() | :AOT_specific) ::
  channel_config_id_t()