midi_loop_start - Man Page

#include <allegro.h>

extern long midi_loop_start;

extern long midi_loop_end;

The loop start and end points, set by the play_looped_midi() function.  These may safely be altered while the music is playing, but you should be  sure they are always set to sensible values (start < end). If you are  changing them both at the same time, make sure to alter them in the right  order in case a MIDI interrupt happens to occur in between your two  writes! Setting these values to -1 represents the start and end of the  file respectively.

play_looped_midi(3)

play_looped_midi(3).

The man page midi_loop_end(3) is an alias of midi_loop_start(3).