al_get_voice_position - Allegro 5 API

       When  the  voice  has  a  non-streaming object attached to it, e.g. a sample, returns the voice’s current
       sample position.  Otherwise, returns zero.

       al_get_voice_position - Allegro 5 API

al_set_voice_position(3alleg5).

Allegro reference manual                                                          al_get_voice_position(3alleg5)

              #include <allegro5/allegro_audio.h>

              unsigned int al_get_voice_position(const ALLEGRO_VOICE *voice)