al_load_audio_stream - Allegro 5 API

       Loads an audio file from disk as it is needed.

       Unlike  regular  streams, the one returned by this function need not be fed by the user; the library will
       automatically read more of the file as it is needed.  The stream will contain buffer_count  buffers  with
       samples samples.

       The  audio stream will start in the playing state.  It should be attached to a voice or mixer to generate
       any output.  See ALLEGRO_AUDIO_STREAM(3alleg5) for more details.

       Returns the stream on success, NULL on failure.

              Note: the allegro_audio library does not support any audio file formats by default.  You must  use
              the allegro_acodec addon, or register your own format handler.

       al_load_audio_stream - Allegro 5 API

al_load_audio_stream_f(3alleg5), al_register_audio_stream_loader(3alleg5), al_init_acodec_addon(3alleg5)

Allegro reference manual                                                           al_load_audio_stream(3alleg5)

              #include <allegro5/allegro_audio.h>

              ALLEGRO_AUDIO_STREAM *al_load_audio_stream(const char *filename,
                 size_t buffer_count, unsigned int samples)