al_load_sample - Allegro 5 API

       Loads a few different audio file formats based on their extension.

       Note  that  this stores the entire file in memory at once, which may be time consuming.  To read the file
       as it is needed, use al_load_audio_stream(3alleg5) or al_play_audio_stream(3alleg5).

       Returns the sample on success, NULL on failure.

              Note: the allegro_audio library does not support any audio file formats by default.  You must  use
              the allegro_acodec addon, or register your own format handler.

       al_load_sample - Allegro 5 API

al_register_sample_loader(3alleg5), al_init_acodec_addon(3alleg5)

Allegro reference manual                                                                 al_load_sample(3alleg5)

              #include <allegro5/allegro_audio.h>

              ALLEGRO_SAMPLE *al_load_sample(const char *filename)