al_set_audio_stream_loop_secs - Man Page

#include <allegro5/allegro_audio.h>

bool al_set_audio_stream_loop_secs(ALLEGRO_AUDIO_STREAM *stream,
   double start, double end)

Sets the loop points for the stream in seconds. Currently this can only be called on streams created with al_load_audio_stream(3), al_play_audio_stream(3), al_load_audio_stream_f(3) or al_play_audio_stream_f(3).