ed to be equal to num_ref_idx_l1_default_active_minus1 The range of num ref idx 1active minus1 is constrained as specified in the semantics for num_ref_idx_10_active_minus1 with 10 and list 0 replaced by 11 and list 1, respectively. cabac init ide specifies the index for determining the initialisation table used in the initialisation process for context variables. The value of cabac_init_idc shall be in the range of 0 to 2, inclusive. slice_qp_delta specifies the initial value of QPy to be used for all the macroblocks in the slice until modified by the value of mb_qp_delta in the macroblock layer. The initial QPY quantisation parameter for the slice is computed as 26+pic_init_qp_minus26+slice_qp_delta (7-29) The value of slice delta shall be limited such that SliceQPy is in the range of -QpBdOffsety to +51, inclusive. sp_for_switch_flag specifies the decoding process to be used to decode P macroblocks in an SP slice as follows: If sp_for_switch_flag is equal to 0, the P macroblocks in the SP slice shall be decoded using the SP decoding process for non-switching pictures as specified in clause 8.6.1. Rec. ITU-T H.264 (01/2012) Otherwise (sp_for_switch_flag is equal to 1), the P macroblocks in the SP slice shall be decoded using the SP and SI decoding process for switching pictures as specified in clause 8.6.2. slice_qs_delta specifies the value of QSy for all the macroblocks in SP and SI slices. The QSy quantisation parameter for the slice is computed as QSy=26+pic_init_qs_minus26+ slice_qs_delta (7-30) The value of slice qs delta shall be limited such that QSy is in the range of 0 to 51, inclusive. This value of QSy is used for the decoding of all macroblocks in SI slices with mb_type equal to SI and all macroblocks in SP slices that are coded in an Inter macroblock prediction mode. disable_deblocking_filter_idc specifies whether the operation of the deblocking filter shall be disabled across some block edges of the slice and specifies for which edges the filtering is disabled. When disable_deblocking_filter_idc 