Function estimate_sb_motion 

fn estimate_sb_motion<T: Pixel>(
    fi: &FrameInvariants<T>,
    ts: &mut TileStateMut<'_, T>,
    ref_frame: RefType,
    mv_size_in_b_log2: usize,
    tile_bo: TileBlockOffset,
    init: bool,
    ssdec: u8,
    lambda: u32,
    bit_depth: usize,
    cpu_feature_level: CpuFeatureLevel,
)