Get the next playlist entry, in both character-converted and raw formats
#include <mm/mmplaylist.h>
int mmplaylist_entry_next_get_raw(mmplaylist_t *pl, mmplaylist_entry_t **entry, mmplaylist_entry_t **raw_entry)
>=0 The position of the current entry.
-1 An error occurred (call mmplaylist_last_error_get() for details).