PAD_OUT
v4l2_subdev_state_get_crop(sd_state, PAD_OUT)
mf = v4l2_subdev_state_get_format(fh->state, PAD_OUT);
*v4l2_subdev_state_get_crop(fh->state, PAD_OUT) = s5k5baf_cis_rect;
state->pads[PAD_OUT].flags = MEDIA_PAD_FL_SOURCE;