V4L2_RDS_BLOCK_INVALID
blocknum = V4L2_RDS_BLOCK_INVALID;
blocknum = V4L2_RDS_BLOCK_INVALID;
rds.block |= V4L2_RDS_BLOCK_INVALID;
if ((rds.block & V4L2_RDS_BLOCK_MSK) == V4L2_RDS_BLOCK_INVALID ||