is not present in the slice header, the value of disable_deblocking_filter_idc shall be inferred to be equal to 0. The value of disable_deblocking_filter_ide shall be in the range of 0 to 2, inclusive. lice_alpha_c0_offset_div2s specifies the offset used in accessing the a and tco deblocking filter tables for filtering operations controlled by the macroblocks within the slice. From this value, the offset that shall be applied when addressing these tables shall be computed as FilterOffsetA = slice_alpha_c0_offset_div2<<1 (7-31) The value of slice_alpha_c0_offset_div2 shall be in the range of -6 to +6, inclusive. When slice_alpha_c0_offset_div2 not present in the slice header, the value fslice_alpha_c0_offset_div2 shall be inferred to be equal to 0. slice_beta_offset_div2 specifies the offset used in accessing the deblocking filter table for filtering operations controlled by the macroblocks within the slice. From this value, the offset that is applied when addressing the table of the deblocking filter shall be computed as FilterOffsetB = slice_beta_offset_div2<<1 (7-32) The value of slice_beta_offset_div2 shall be in the range of -6 to +6, inclusive. When slice_beta_offset_div2 not present in the slice header the value of slice_beta_offset_div2 shall be inferred to be equal to 0. slice_group_change_cycle is used to derive the number of slice group map units in slice group 0 when slice_group_map_type is equal to 3, 4, or 5, as specified by MapUnitsInSliceGroup0=Min(slice_group_change_cycle*SliceGroupChangeRate, = PicSizeInMapUnits ) (7-33) The value of slice_group_change_cycle is represented in the bitstream by the following number of bits Ceil(Log2(PicSizeInMapUnits SliceGroupChangeRate + 1)) (7-34) The value of slice_group_change_cycle shall be in the range of 0 to Ceil( PicSizeInMapUnits:SliceGroupChangeRate) inclusive. 7.4.3.1 Reference picture list modification semantics The syntax elements modification_of_pic_nums_idc, abs_diff_pic_num_minus1, and long_term_pic_num specify the change from the initial referenc