VIMC_SCALER_SRC
src_fmt = v4l2_subdev_state_get_format(sd_state, VIMC_SCALER_SRC);
format = v4l2_subdev_state_get_format(state, VIMC_SCALER_SRC);
vscaler->pads[VIMC_SCALER_SRC].flags = MEDIA_PAD_FL_SOURCE;