Allegro 5 api
#include <allegro5/allegro_audio.h> void al_drain_audio_stream(ALLEGRO_AUDIO_STREAM *stream)
You should call this to finalise an audio stream that you will no longer be feeding, to wait for all pending buffers to finish playing. The stream\[aq]s playing state will change to false.
al_destroy_audio_stream(3alleg5)