Lines Matching refs:ps_bitstrm
121 static WORD32 ih264e_generate_nal_unit_header(bitstrm_t *ps_bitstrm, in ih264e_generate_nal_unit_header() argument
131 PUT_BITS(ps_bitstrm, in ih264e_generate_nal_unit_header()
158 WORD32 ih264e_generate_vui(bitstrm_t *ps_bitstrm, vui_t *ps_vui) in ih264e_generate_vui() argument
163 PUT_BITS(ps_bitstrm, ps_vui->u1_aspect_ratio_info_present_flag, 1, in ih264e_generate_vui()
168 PUT_BITS(ps_bitstrm, ps_vui->u1_aspect_ratio_idc, 8, return_status, in ih264e_generate_vui()
172 PUT_BITS(ps_bitstrm, ps_vui->u2_sar_width, 16, return_status, in ih264e_generate_vui()
175 PUT_BITS(ps_bitstrm, ps_vui->u2_sar_height, 16, return_status, in ih264e_generate_vui()
181 PUT_BITS(ps_bitstrm, ps_vui->u1_overscan_info_present_flag, 1, in ih264e_generate_vui()
187 PUT_BITS(ps_bitstrm, ps_vui->u1_overscan_appropriate_flag, 1, in ih264e_generate_vui()
192 PUT_BITS(ps_bitstrm, ps_vui->u1_video_signal_type_present_flag, 1, in ih264e_generate_vui()
197 PUT_BITS(ps_bitstrm, ps_vui->u1_video_format, 3, return_status, in ih264e_generate_vui()
201 PUT_BITS(ps_bitstrm, ps_vui->u1_video_full_range_flag, 1, return_status, in ih264e_generate_vui()
205 PUT_BITS(ps_bitstrm, ps_vui->u1_colour_description_present_flag, 1, in ih264e_generate_vui()
211 PUT_BITS(ps_bitstrm, ps_vui->u1_colour_primaries, 8, return_status, in ih264e_generate_vui()
215 PUT_BITS(ps_bitstrm, ps_vui->u1_transfer_characteristics, 8, in ih264e_generate_vui()
219 PUT_BITS(ps_bitstrm, ps_vui->u1_matrix_coefficients, 8, in ih264e_generate_vui()
226 PUT_BITS(ps_bitstrm, ps_vui->u1_chroma_loc_info_present_flag, 1, in ih264e_generate_vui()
232 PUT_BITS_UEV(ps_bitstrm, ps_vui->u1_chroma_sample_loc_type_top_field, in ih264e_generate_vui()
236 PUT_BITS_UEV(ps_bitstrm, ps_vui->u1_chroma_sample_loc_type_bottom_field, in ih264e_generate_vui()
241 PUT_BITS(ps_bitstrm, ps_vui->u1_vui_timing_info_present_flag, 1, in ih264e_generate_vui()
247 PUT_BITS(ps_bitstrm, ps_vui->u4_vui_num_units_in_tick, 32, in ih264e_generate_vui()
251 PUT_BITS(ps_bitstrm, ps_vui->u4_vui_time_scale, 32, return_status, in ih264e_generate_vui()
255 PUT_BITS(ps_bitstrm, ps_vui->u1_fixed_frame_rate_flag, 1, return_status, in ih264e_generate_vui()
261 PUT_BITS(ps_bitstrm, ps_vui->u1_nal_hrd_parameters_present_flag, 1, in ih264e_generate_vui()
269 PUT_BITS_UEV(ps_bitstrm, ps_hrd_params->u1_cpb_cnt_minus1, in ih264e_generate_vui()
273 PUT_BITS(ps_bitstrm, ps_hrd_params->u4_bit_rate_scale, 4, return_status, in ih264e_generate_vui()
277 PUT_BITS(ps_bitstrm, ps_hrd_params->u4_cpb_size_scale, 4, return_status, in ih264e_generate_vui()
282 PUT_BITS_UEV(ps_bitstrm, in ih264e_generate_vui()
287 PUT_BITS_UEV(ps_bitstrm, in ih264e_generate_vui()
292 PUT_BITS(ps_bitstrm, ps_hrd_params->au1_cbr_flag[i], 1, in ih264e_generate_vui()
297 PUT_BITS(ps_bitstrm, in ih264e_generate_vui()
302 PUT_BITS(ps_bitstrm, ps_hrd_params->u1_cpb_removal_delay_length_minus1, in ih264e_generate_vui()
306 PUT_BITS(ps_bitstrm, ps_hrd_params->u1_dpb_output_delay_length_minus1, in ih264e_generate_vui()
310 PUT_BITS(ps_bitstrm, ps_hrd_params->u1_time_offset_length, 5, in ih264e_generate_vui()
315 PUT_BITS(ps_bitstrm, ps_vui->u1_vcl_hrd_parameters_present_flag, 1, in ih264e_generate_vui()
323 PUT_BITS_UEV(ps_bitstrm, ps_hrd_params->u1_cpb_cnt_minus1, in ih264e_generate_vui()
327 PUT_BITS(ps_bitstrm, ps_hrd_params->u4_bit_rate_scale, 4, return_status, in ih264e_generate_vui()
331 PUT_BITS(ps_bitstrm, ps_hrd_params->u4_cpb_size_scale, 4, return_status, in ih264e_generate_vui()
336 PUT_BITS_UEV(ps_bitstrm, in ih264e_generate_vui()
341 PUT_BITS_UEV(ps_bitstrm, in ih264e_generate_vui()
346 PUT_BITS(ps_bitstrm, ps_hrd_params->au1_cbr_flag[i], 1, in ih264e_generate_vui()
351 PUT_BITS(ps_bitstrm, in ih264e_generate_vui()
356 PUT_BITS(ps_bitstrm, ps_hrd_params->u1_cpb_removal_delay_length_minus1, in ih264e_generate_vui()
360 PUT_BITS(ps_bitstrm, ps_hrd_params->u1_dpb_output_delay_length_minus1, in ih264e_generate_vui()
364 PUT_BITS(ps_bitstrm, ps_hrd_params->u1_time_offset_length, 5, in ih264e_generate_vui()
372 PUT_BITS(ps_bitstrm, ps_vui->u1_low_delay_hrd_flag, 1, return_status, in ih264e_generate_vui()
376 PUT_BITS(ps_bitstrm, ps_vui->u1_pic_struct_present_flag, 1, return_status, in ih264e_generate_vui()
380 PUT_BITS(ps_bitstrm, ps_vui->u1_bitstream_restriction_flag, 1, in ih264e_generate_vui()
386 PUT_BITS(ps_bitstrm, ps_vui->u1_motion_vectors_over_pic_boundaries_flag, in ih264e_generate_vui()
390 PUT_BITS_UEV(ps_bitstrm, ps_vui->u1_max_bytes_per_pic_denom, in ih264e_generate_vui()
394 PUT_BITS_UEV(ps_bitstrm, ps_vui->u1_max_bits_per_mb_denom, in ih264e_generate_vui()
398 PUT_BITS_UEV(ps_bitstrm, ps_vui->u1_log2_max_mv_length_horizontal, in ih264e_generate_vui()
402 PUT_BITS_UEV(ps_bitstrm, ps_vui->u1_log2_max_mv_length_vertical, in ih264e_generate_vui()
406 PUT_BITS_UEV(ps_bitstrm, ps_vui->u1_num_reorder_frames, return_status, in ih264e_generate_vui()
410 PUT_BITS_UEV(ps_bitstrm, ps_vui->u1_max_dec_frame_buffering, in ih264e_generate_vui()
438 WORD32 ih264e_generate_sps(bitstrm_t *ps_bitstrm, sps_t *ps_sps, vui_t *ps_vui) in ih264e_generate_sps() argument
446 return_status |= ih264e_put_nal_start_code_prefix(ps_bitstrm, 1); in ih264e_generate_sps()
449 return_status |= ih264e_generate_nal_unit_header(ps_bitstrm, i1_nal_unit_type, i1_nal_ref_idc); in ih264e_generate_sps()
452 PUT_BITS(ps_bitstrm, ps_sps->u1_profile_idc, 8, return_status, "profile_idc"); in ih264e_generate_sps()
455 … PUT_BITS(ps_bitstrm, ps_sps->u1_constraint_set0_flag, 1, return_status, "constrained_set0_flag"); in ih264e_generate_sps()
456 … PUT_BITS(ps_bitstrm, ps_sps->u1_constraint_set1_flag, 1, return_status, "constrained_set1_flag"); in ih264e_generate_sps()
457 … PUT_BITS(ps_bitstrm, ps_sps->u1_constraint_set2_flag, 1, return_status, "constrained_set2_flag"); in ih264e_generate_sps()
458 … PUT_BITS(ps_bitstrm, ps_sps->u1_constraint_set3_flag, 1, return_status, "constrained_set3_flag"); in ih264e_generate_sps()
461 PUT_BITS(ps_bitstrm, 0, 4, return_status, "reserved_zero_four_bits"); in ih264e_generate_sps()
464 PUT_BITS(ps_bitstrm, ps_sps->u1_level_idc, 8, return_status, "level_idc"); in ih264e_generate_sps()
467 PUT_BITS_UEV(ps_bitstrm, ps_sps->u1_sps_id, return_status, "seq_parameter_set_id"); in ih264e_generate_sps()
472 PUT_BITS_UEV(ps_bitstrm, ps_sps->u1_chroma_format_idc, return_status, "chroma_format_idc"); in ih264e_generate_sps()
477 …PUT_BITS(ps_bitstrm, ps_sps->i1_residual_colour_transform_flag, 1, return_status, "i1_residual_col… in ih264e_generate_sps()
481 … PUT_BITS_UEV(ps_bitstrm, (ps_sps->i1_bit_depth_luma - 8), return_status, "bit_depth_luma_minus8"); in ih264e_generate_sps()
484 …PUT_BITS_UEV(ps_bitstrm, (ps_sps->i1_bit_depth_chroma - 8), return_status, "bit_depth_chroma_minus… in ih264e_generate_sps()
487 …PUT_BITS(ps_bitstrm, ps_sps->i1_qpprime_y_zero_transform_bypass_flag, 1, return_status, "qpprime_y… in ih264e_generate_sps()
490 …PUT_BITS(ps_bitstrm, ps_sps->i1_seq_scaling_matrix_present_flag, 1, return_status, "seq_scaling_ma… in ih264e_generate_sps()
500 …PUT_BITS_UEV(ps_bitstrm, (ps_sps->i1_log2_max_frame_num - 4), return_status, "log2_max_frame_num_m… in ih264e_generate_sps()
503 PUT_BITS_UEV(ps_bitstrm, ps_sps->i1_pic_order_cnt_type, return_status, "pic_order_cnt_type"); in ih264e_generate_sps()
508 …PUT_BITS_UEV(ps_bitstrm, (ps_sps->i1_log2_max_pic_order_cnt_lsb - 4), return_status, "log2_max_pic… in ih264e_generate_sps()
513 …PUT_BITS(ps_bitstrm, ps_sps->i1_delta_pic_order_always_zero_flag, 1, return_status, "delta_pic_ord… in ih264e_generate_sps()
516 …PUT_BITS_SEV(ps_bitstrm, ps_sps->i4_offset_for_non_ref_pic, return_status, "offset_for_non_ref_pic… in ih264e_generate_sps()
519 …PUT_BITS_SEV(ps_bitstrm, ps_sps->i4_offset_for_top_to_bottom_field, return_status, "offset_for_top… in ih264e_generate_sps()
522 …PUT_BITS_UEV(ps_bitstrm, ps_sps->u1_num_ref_frames_in_pic_order_cnt_cycle, return_status, "num_ref… in ih264e_generate_sps()
528 …PUT_BITS_SEV(ps_bitstrm, ps_sps->ai4_offset_for_ref_frame[i], return_status, "offset_for_ref_frame… in ih264e_generate_sps()
533 PUT_BITS_UEV(ps_bitstrm, ps_sps->u1_max_num_ref_frames, return_status, "num_ref_frames"); in ih264e_generate_sps()
536 …PUT_BITS(ps_bitstrm, ps_sps->i1_gaps_in_frame_num_value_allowed_flag, 1, return_status, "gaps_in_f… in ih264e_generate_sps()
539 …PUT_BITS_UEV(ps_bitstrm, ps_sps->i2_pic_width_in_mbs_minus1, return_status, "pic_width_in_mbs_minu… in ih264e_generate_sps()
542 …PUT_BITS_UEV(ps_bitstrm, ps_sps->i2_pic_height_in_map_units_minus1, return_status, "pic_height_in_… in ih264e_generate_sps()
545 PUT_BITS(ps_bitstrm, ps_sps->i1_frame_mbs_only_flag, 1, return_status, "frame_mbs_only_flag"); in ih264e_generate_sps()
550 …PUT_BITS(ps_bitstrm, ps_sps->i1_mb_adaptive_frame_field_flag, 1, return_status, "mb_adaptive_frame… in ih264e_generate_sps()
554 …PUT_BITS(ps_bitstrm, ps_sps->i1_direct_8x8_inference_flag, 1, return_status, "direct_8x8_inference… in ih264e_generate_sps()
557 PUT_BITS(ps_bitstrm, ps_sps->i1_frame_cropping_flag, 1, return_status, "frame_cropping_flag"); in ih264e_generate_sps()
562 …PUT_BITS_UEV(ps_bitstrm, ps_sps->i2_frame_crop_left_offset, return_status, "frame_crop_left_offset… in ih264e_generate_sps()
565 …PUT_BITS_UEV(ps_bitstrm, ps_sps->i2_frame_crop_right_offset, return_status, "frame_crop_right_offs… in ih264e_generate_sps()
568 …PUT_BITS_UEV(ps_bitstrm, ps_sps->i2_frame_crop_top_offset, return_status, "frame_crop_top_offset"); in ih264e_generate_sps()
571 …PUT_BITS_UEV(ps_bitstrm, ps_sps->i2_frame_crop_bottom_offset, return_status, "frame_crop_bottom_of… in ih264e_generate_sps()
575 …PUT_BITS(ps_bitstrm, ps_sps->i1_vui_parameters_present_flag, 1, return_status, "vui_parameters_pre… in ih264e_generate_sps()
580 return_status |= ih264e_generate_vui(ps_bitstrm, ps_vui); in ih264e_generate_sps()
584 return_status |= ih264e_put_rbsp_trailing_bits(ps_bitstrm); in ih264e_generate_sps()
607 WORD32 ih264e_generate_pps(bitstrm_t *ps_bitstrm, pps_t *ps_pps, sps_t *ps_sps) in ih264e_generate_pps() argument
612 return_status |= ih264e_put_nal_start_code_prefix(ps_bitstrm, 1); in ih264e_generate_pps()
615 PUT_BITS(ps_bitstrm, NAL_PPS_FIRST_BYTE, 8, return_status, "pps_header"); in ih264e_generate_pps()
618 PUT_BITS_UEV(ps_bitstrm, ps_pps->u1_pps_id, return_status, "pic_parameter_set_id"); in ih264e_generate_pps()
621 PUT_BITS_UEV(ps_bitstrm, ps_pps->u1_sps_id, return_status, "seq_parameter_set_id"); in ih264e_generate_pps()
624 …PUT_BITS(ps_bitstrm, ps_pps->u1_entropy_coding_mode_flag, 1, return_status, "Entropy coding : 0-VL… in ih264e_generate_pps()
627 …PUT_BITS(ps_bitstrm, ps_pps->u1_pic_order_present_flag, 1, return_status, "Pic order present flag"… in ih264e_generate_pps()
630 …PUT_BITS_UEV(ps_bitstrm, ps_pps->u1_num_slice_groups - 1, return_status, "Number of slice groups"); in ih264e_generate_pps()
639 …PUT_BITS_UEV(ps_bitstrm, ps_pps->i1_num_ref_idx_l0_default_active - 1, return_status, "num_ref_idx… in ih264e_generate_pps()
642 …PUT_BITS_UEV(ps_bitstrm, ps_pps->i1_num_ref_idx_l1_default_active - 1, return_status, "num_ref_idx… in ih264e_generate_pps()
645 PUT_BITS(ps_bitstrm, ps_pps->i1_weighted_pred_flag, 1, return_status, "weighted_pred_flag"); in ih264e_generate_pps()
648 PUT_BITS(ps_bitstrm, ps_pps->i1_weighted_bipred_idc, 2, return_status, "weighted_bipred_idc"); in ih264e_generate_pps()
651 PUT_BITS_SEV(ps_bitstrm, ps_pps->i1_pic_init_qp - 26, return_status, "pic_init_qp_minus26"); in ih264e_generate_pps()
654 PUT_BITS_SEV(ps_bitstrm, ps_pps->i1_pic_init_qs - 26, return_status, "pic_init_qs_minus26"); in ih264e_generate_pps()
657 …PUT_BITS_SEV(ps_bitstrm, ps_pps->i1_chroma_qp_index_offset, return_status, "chroma_qp_index_offset… in ih264e_generate_pps()
660 …PUT_BITS(ps_bitstrm, ps_pps->i1_deblocking_filter_control_present_flag, 1, return_status, "deblock… in ih264e_generate_pps()
663 …PUT_BITS(ps_bitstrm, ps_pps->i1_constrained_intra_pred_flag, 1, return_status, "constrained_intra_… in ih264e_generate_pps()
666 …PUT_BITS(ps_bitstrm, ps_pps->i1_redundant_pic_cnt_present_flag, 1, return_status, "redundant_pic_c… in ih264e_generate_pps()
671 …PUT_BITS(ps_bitstrm, ps_pps->i1_transform_8x8_mode_flag, 1, return_status, "transform_8x8_mode_fla… in ih264e_generate_pps()
674 …PUT_BITS(ps_bitstrm, ps_pps->i1_pic_scaling_matrix_present_flag, 1, return_status, "pic_scaling_ma… in ih264e_generate_pps()
682 …PUT_BITS_SEV(ps_bitstrm, ps_pps->i1_second_chroma_qp_index_offset, return_status, "Second chroma Q… in ih264e_generate_pps()
685 return_status |= ih264e_put_rbsp_trailing_bits(ps_bitstrm); in ih264e_generate_pps()
720 WORD32 ih264e_generate_slice_header(bitstrm_t *ps_bitstrm, in ih264e_generate_slice_header() argument
729 return_status |= ih264e_put_nal_start_code_prefix(ps_bitstrm, 1); in ih264e_generate_slice_header()
732 …return_status |= ih264e_generate_nal_unit_header(ps_bitstrm, ps_slice_hdr->i1_nal_unit_type, ps_sl… in ih264e_generate_slice_header()
735 … PUT_BITS_UEV(ps_bitstrm, ps_slice_hdr->u2_first_mb_in_slice, return_status, "first_mb_in_slice"); in ih264e_generate_slice_header()
738 PUT_BITS_UEV(ps_bitstrm, ps_slice_hdr->u1_slice_type, return_status, "slice_type"); in ih264e_generate_slice_header()
741 PUT_BITS_UEV(ps_bitstrm, ps_slice_hdr->u1_pps_id, return_status, "pic_parameter_set_id"); in ih264e_generate_slice_header()
744 …PUT_BITS(ps_bitstrm, ps_slice_hdr->i4_frame_num, ps_sps->i1_log2_max_frame_num, return_status, "fr… in ih264e_generate_slice_header()
749 PUT_BITS(ps_bitstrm, ps_slice_hdr->i1_field_pic_flag, 1, return_status, "field_pic_flag"); in ih264e_generate_slice_header()
754 … PUT_BITS(ps_bitstrm, ps_slice_hdr->i1_bottom_field_flag, 1, return_status, "bottom_field_flag"); in ih264e_generate_slice_header()
761 PUT_BITS_UEV(ps_bitstrm, ps_slice_hdr->u2_idr_pic_id, return_status, "u2_idr_pic_id"); in ih264e_generate_slice_header()
767 …PUT_BITS(ps_bitstrm, ps_slice_hdr->i4_pic_order_cnt_lsb, ps_sps->i1_log2_max_pic_order_cnt_lsb, re… in ih264e_generate_slice_header()
772 …PUT_BITS_SEV(ps_bitstrm, ps_slice_hdr->i4_delta_pic_order_cnt_bottom, return_status, "delta_pic_or… in ih264e_generate_slice_header()
779 …PUT_BITS_SEV(ps_bitstrm, ps_slice_hdr->ai4_delta_pic_order_cnt[0], return_status, "delta_pic_order… in ih264e_generate_slice_header()
784 …PUT_BITS_SEV(ps_bitstrm, ps_slice_hdr->ai4_delta_pic_order_cnt[1], return_status, "delta_pic_order… in ih264e_generate_slice_header()
791 … PUT_BITS_UEV(ps_bitstrm, ps_slice_hdr->u1_redundant_pic_cnt, return_status, "redundant_pic_cnt"); in ih264e_generate_slice_header()
797 …PUT_BITS(ps_bitstrm, ps_slice_hdr->u1_direct_spatial_mv_pred_flag, 1, return_status, "direct_spati… in ih264e_generate_slice_header()
803 …PUT_BITS(ps_bitstrm, ps_slice_hdr->u1_num_ref_idx_active_override_flag, 1, return_status, "num_ref… in ih264e_generate_slice_header()
808 …PUT_BITS_UEV(ps_bitstrm, ps_slice_hdr->i1_num_ref_idx_l0_active - 1, return_status, "num_ref_idx_l… in ih264e_generate_slice_header()
813 …PUT_BITS_UEV(ps_bitstrm, ps_slice_hdr->i1_num_ref_idx_l1_active - 1, return_status, "num_ref_idx_l… in ih264e_generate_slice_header()
823 …PUT_BITS(ps_bitstrm, ps_slice_hdr->u1_ref_idx_reordering_flag_l0, 1, return_status, "ref_pic_list_… in ih264e_generate_slice_header()
834 …PUT_BITS(ps_bitstrm, ps_slice_hdr->u1_ref_idx_reordering_flag_l1, 1, return_status, "ref_pic_list_… in ih264e_generate_slice_header()
855 …PUT_BITS(ps_bitstrm, ps_slice_hdr->u1_no_output_of_prior_pics_flag , 1, return_status, "no_output_… in ih264e_generate_slice_header()
858 …PUT_BITS(ps_bitstrm, ps_slice_hdr->u1_long_term_reference_flag , 1, return_status, "long_term_refe… in ih264e_generate_slice_header()
863 …PUT_BITS(ps_bitstrm, ps_slice_hdr->u1_adaptive_ref_pic_marking_mode_flag , 1, return_status, "adap… in ih264e_generate_slice_header()
877 PUT_BITS_UEV(ps_bitstrm, ps_slice_hdr->i1_cabac_init_idc, return_status, "cabac_init_idc"); in ih264e_generate_slice_header()
881 …PUT_BITS_SEV(ps_bitstrm, ps_slice_hdr->i1_slice_qp - ps_pps->i1_pic_init_qp, return_status, "slice… in ih264e_generate_slice_header()
888 …PUT_BITS(ps_bitstrm, ps_slice_hdr->u1_sp_for_switch_flag , 1, return_status, "sp_for_switch_flag"); in ih264e_generate_slice_header()
891 …PUT_BITS_SEV(ps_bitstrm, ps_slice_hdr->u1_slice_qs - ps_pps->i1_pic_init_qs, return_status, "slice… in ih264e_generate_slice_header()
897 …PUT_BITS_UEV(ps_bitstrm, ps_slice_hdr->u1_disable_deblocking_filter_idc, return_status, "disable_d… in ih264e_generate_slice_header()
902 …PUT_BITS_SEV(ps_bitstrm, ps_slice_hdr->i1_slice_alpha_c0_offset_div2, return_status, "slice_alpha_… in ih264e_generate_slice_header()
905 …PUT_BITS_SEV(ps_bitstrm, ps_slice_hdr->i1_slice_beta_offset_div2, return_status, "slice_beta_offse… in ih264e_generate_slice_header()
1502 IH264E_ERROR_T ih264e_add_filler_nal_unit(bitstrm_t *ps_bitstrm, in ih264e_add_filler_nal_unit() argument
1510 return_status |= ih264e_put_nal_start_code_prefix(ps_bitstrm, 1); in ih264e_add_filler_nal_unit()
1512 if (ps_bitstrm->u4_strm_buf_offset + insert_fill_bytes >= ps_bitstrm->u4_max_strm_size) in ih264e_add_filler_nal_unit()
1518 PUT_BITS(ps_bitstrm, NAL_FILLER_FIRST_BYTE, 8, return_status, "filler_header"); in ih264e_add_filler_nal_unit()
1520 PUT_BITS(ps_bitstrm, 0xFFFFFF, 24, return_status, "fill bytes"); in ih264e_add_filler_nal_unit()
1541 PUT_BITS(ps_bitstrm, 0xFFFFFFFF, 32, return_status, "fill bytes"); in ih264e_add_filler_nal_unit()
1546 return_status |= ih264e_put_rbsp_trailing_bits(ps_bitstrm); in ih264e_add_filler_nal_unit()