al_destroy_audio_recorder man page
al_destroy_audio_recorder — Allegro 5 API
#include <allegro5/allegro_audio.h> void al_destroy_audio_recorder(ALLEGRO_AUDIO_RECORDER *r)
Destroys the audio recorder and frees all resources associated with it. It is safe to destroy a recorder that is recording.
You may receive events after the recorder has been destroyed. They must be ignored, as the fragment buffer will no longer be valid.
[Unstable API]: The API may need a slight redesign.