TV_UV_INC_FIX_SCALE
lower_border = ((params->uv_inc + TV_UV_INC_FIX_SCALE - 1) >> TV_UV_INC_FIX_SHIFT);
uv_accum_frac = tmp_uv_accum_sum & (TV_UV_INC_FIX_SCALE - 1);
uv_accum_frac = (uv_accum_frac + params->uv_inc) & (TV_UV_INC_FIX_SCALE - 1);
first_num += (how_early + TV_UV_INC_FIX_SCALE / 2) >> TV_UV_INC_FIX_SHIFT;