ALLEGRO_SAMPLE_ID - Allegro 5 API

       An  ALLEGRO_SAMPLE_ID  represents  a  sample being played via al_play_sample(3alleg5).  It can be used to
       later stop the sample  with  al_stop_sample(3alleg5).   The  underlying  ALLEGRO_SAMPLE_INSTANCE  can  be
       extracted using al_lock_sample_id(3alleg5).

Allegro reference manual                                                              ALLEGRO_SAMPLE_ID(3alleg5)

       ALLEGRO_SAMPLE_ID - Allegro 5 API

              #include <allegro5/allegro_audio.h>

              typedef struct ALLEGRO_SAMPLE_ID ALLEGRO_SAMPLE_ID;