public SliceHeader readPart2(
SliceHeader sh, NALUnit nalUnit, SeqParameterSet sps, PictureParameterSet pps, BitReader in) {
sh.pps = pps;
sh.sps = sps;
sh.frame_num = readU(in, sps.log2_max_frame_num_minus4 + 4, "SH: frame_num");
if (!sps.frame_mbs_only_flag) {
sh.field_pic_flag = readBool(in, "SH: field_pic_flag");
if (sh.field_pic_flag) {
sh.bottom_field_flag = readBool(in, "SH: bottom_field_flag");
}
}
if (nalUnit.type == NALUnitType.IDR_SLICE) {
sh.idr_pic_id = readUE(in, "SH: idr_pic_id");
}
if (sps.pic_order_cnt_type == 0) {
sh.pic_order_cnt_lsb =
readU(in, sps.log2_max_pic_order_cnt_lsb_minus4 + 4, "SH: pic_order_cnt_lsb");
if (pps.pic_order_present_flag && !sps.field_pic_flag) {
sh.delta_pic_order_cnt_bottom = readSE(in, "SH: delta_pic_order_cnt_bottom");
}
}
sh.delta_pic_order_cnt = new int[2];
if (sps.pic_order_cnt_type == 1 && !sps.delta_pic_order_always_zero_flag) {
sh.delta_pic_order_cnt[0] = readSE(in, "SH: delta_pic_order_cnt[0]");
if (pps.pic_order_present_flag && !sps.field_pic_flag)
sh.delta_pic_order_cnt[1] = readSE(in, "SH: delta_pic_order_cnt[1]");
}
if (pps.redundant_pic_cnt_present_flag) {
sh.redundant_pic_cnt = readUE(in, "SH: redundant_pic_cnt");
}
if (sh.slice_type == SliceType.B) {
sh.direct_spatial_mv_pred_flag = readBool(in, "SH: direct_spatial_mv_pred_flag");
}
if (sh.slice_type == SliceType.P
|| sh.slice_type == SliceType.SP
|| sh.slice_type == SliceType.B) {
sh.num_ref_idx_active_override_flag = readBool(in, "SH: num_ref_idx_active_override_flag");
if (sh.num_ref_idx_active_override_flag) {
sh.num_ref_idx_active_minus1[0] = readUE(in, "SH: num_ref_idx_l0_active_minus1");
if (sh.slice_type == SliceType.B) {
sh.num_ref_idx_active_minus1[1] = readUE(in, "SH: num_ref_idx_l1_active_minus1");
}
}
}
readRefPicListReordering(sh, in);
if ((pps.weighted_pred_flag && (sh.slice_type == SliceType.P || sh.slice_type == SliceType.SP))
|| (pps.weighted_bipred_idc == 1 && sh.slice_type == SliceType.B))
readPredWeightTable(sps, pps, sh, in);
if (nalUnit.nal_ref_idc != 0) readDecoderPicMarking(nalUnit, sh, in);
if (pps.entropy_coding_mode_flag && sh.slice_type.isInter()) {
sh.cabac_init_idc = readUE(in, "SH: cabac_init_idc");
}
sh.slice_qp_delta = readSE(in, "SH: slice_qp_delta");
if (sh.slice_type == SliceType.SP || sh.slice_type == SliceType.SI) {
if (sh.slice_type == SliceType.SP) {
sh.sp_for_switch_flag = readBool(in, "SH: sp_for_switch_flag");
}
sh.slice_qs_delta = readSE(in, "SH: slice_qs_delta");
}
if (pps.deblocking_filter_control_present_flag) {
sh.disable_deblocking_filter_idc = readUE(in, "SH: disable_deblocking_filter_idc");
if (sh.disable_deblocking_filter_idc != 1) {
sh.slice_alpha_c0_offset_div2 = readSE(in, "SH: slice_alpha_c0_offset_div2");
sh.slice_beta_offset_div2 = readSE(in, "SH: slice_beta_offset_div2");
}
}
if (pps.num_slice_groups_minus1 > 0
&& pps.slice_group_map_type >= 3
&& pps.slice_group_map_type <= 5) {
int len =
getPicHeightInMbs(sps)
* (sps.pic_width_in_mbs_minus1 + 1)
/ (pps.slice_group_change_rate_minus1 + 1);
if ((getPicHeightInMbs(sps) * (sps.pic_width_in_mbs_minus1 + 1))
% (pps.slice_group_change_rate_minus1 + 1)
> 0) len += 1;
len = CeilLog2(len + 1);
sh.slice_group_change_cycle = readU(in, len, "SH: slice_group_change_cycle");
}
return sh;
}