al_get_channel_count - Allegro 5 API

       Return  the  number  of  channels  for the given channel configuration, which is one of the values listed
       under ALLEGRO_CHANNEL_CONF(3alleg5).

Allegro reference manual                                                           al_get_channel_count(3alleg5)

       al_get_channel_count - Allegro 5 API

              #include <allegro5/allegro_audio.h>

              size_t al_get_channel_count(ALLEGRO_CHANNEL_CONF conf)