al_get_sample - Allegro 5 API

       Return the sample data that the sample instance plays.

       Note  this  returns a pointer to an internal structure, not the ALLEGRO_SAMPLE(3alleg5) that you may have
       passed to al_set_sample(3alleg5).  However, the sample buffer of the returned ALLEGRO_SAMPLE will be  the
       same  as  the  one that was used to create the sample (passed to al_create_sample(3alleg5)).  You can use
       al_get_sample_data(3alleg5) on the return value to retrieve and compare it.

       al_get_sample - Allegro 5 API

al_set_sample(3alleg5)

Allegro reference manual                                                                  al_get_sample(3alleg5)

              #include <allegro5/allegro_audio.h>

              ALLEGRO_SAMPLE *al_get_sample(ALLEGRO_SAMPLE_INSTANCE *spl)