al_stop_audio_recorder - Man Page
Allegro 5 API
#include <allegro5/allegro_audio.h> void al_stop_audio_recorder(ALLEGRO_AUDIO_RECORDER *r)
Stop capturing audio data. Note that the audio recorder is still active and consuming resources, so if you are finished recording you should destroy it with al_destroy_audio_recorder(3).
You may still receive a few events after you call this function as the device flushes the buffer.
If you restart the recorder, it will begin recording at the beginning of the next fragment buffer.
[Unstable API]: The API may need a slight redesign.
Allegro reference manual