pub unsafe extern "C" fn libvlc_audio_set_callbacks(
mp: *mut libvlc_media_player_t,
play: libvlc_audio_play_cb,
pause: libvlc_audio_pause_cb,
resume: libvlc_audio_resume_cb,
flush: libvlc_audio_flush_cb,
drain: libvlc_audio_drain_cb,
opaque: *mut c_void,
)