rbsp_write_uev
return rbsp_write_uev(rbsp, &tmp);
.rbsp_uev = rbsp_write_uev,
ret = rbsp_write_uev(&sps, 0); /* crop_left */
ret = rbsp_write_uev(&sps, crop_right);
ret = rbsp_write_uev(&sps, 0); /* crop_top */
ret = rbsp_write_uev(&sps, crop_bottom);