al_set_mixer_playing - Allegro 5 API

       Change whether the mixer is playing.

       Returns true on success, false on failure.

       al_set_mixer_playing - Allegro 5 API

al_get_mixer_playing(3alleg5).

Allegro reference manual                                                           al_set_mixer_playing(3alleg5)

              #include <allegro5/allegro_audio.h>

              bool al_set_mixer_playing(ALLEGRO_MIXER *mixer, bool val)