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eexuke |
//--------------------------------------------------------------------------------------------------
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// Design : nova
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// Author(s) : Ke Xu
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// Email : eexuke@yahoo.com
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// File : pc_decoding.v
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// Generated : June 6, 2005
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// Copyright (C) 2008 Ke Xu
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//-------------------------------------------------------------------------------------------------
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// Description
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// Decoding program counter for bitstream_buffer
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//-------------------------------------------------------------------------------------------------
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// synopsys translate_off
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`include "timescale.v"
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// synopsys translate_on
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`include "nova_defines.v"
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module pc_decoding (clk,reset_n,parser_state,nal_unit_state,slice_header_state,ref_pic_list_reordering_state,
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dec_ref_pic_marking_state,slice_data_state,sub_mb_pred_state,mb_pred_state,seq_parameter_set_state,
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pic_parameter_set_state,exp_golomb_len,dependent_variable_len,cavlc_consumed_bits_len,
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pc);
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input clk,reset_n;
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input [1:0] parser_state;
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input [2:0] nal_unit_state;
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input [3:0] slice_header_state;
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input [2:0] ref_pic_list_reordering_state;
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input [1:0] dec_ref_pic_marking_state;
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input [3:0] slice_data_state;
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input [1:0] sub_mb_pred_state;
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input [2:0] mb_pred_state;
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input [3:0] seq_parameter_set_state;
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input [3:0] pic_parameter_set_state;
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input [3:0] exp_golomb_len;
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input [3:0] dependent_variable_len;
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input [4:0] cavlc_consumed_bits_len;
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output [6:0] pc;
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reg [6:0] pc;
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reg [2:0] consumed_bits_sel;
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reg [4:0] FixedLen;
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always @ (reset_n or parser_state or nal_unit_state or slice_header_state or ref_pic_list_reordering_state or
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dec_ref_pic_marking_state or slice_data_state or sub_mb_pred_state or mb_pred_state or
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seq_parameter_set_state or pic_parameter_set_state)
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if (reset_n == 0)
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consumed_bits_sel <= `rst_consumed_bits_sel;
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else if (parser_state == `start_code_prefix)
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consumed_bits_sel <= `fixed_length;
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else if (nal_unit_state == `forbidden_zero_bit_2_nal_unit_type)
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consumed_bits_sel <= `fixed_length;
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else if (slice_header_state != `rst_slice_header)
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case (slice_header_state)
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`first_mb_in_slice_s :consumed_bits_sel <= `exp_golomb;
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`slice_type_s :consumed_bits_sel <= `exp_golomb;
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`pic_parameter_set_id_slice_header_s :consumed_bits_sel <= `exp_golomb;
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`frame_num_s :consumed_bits_sel <= `dependent_variable;
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`idr_pic_id_s :consumed_bits_sel <= `exp_golomb;
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`pic_order_cnt_lsb_s :consumed_bits_sel <= `dependent_variable;
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`num_ref_idx_active_override_flag_s :consumed_bits_sel <= `fixed_length;
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`num_ref_idx_l0_active_minus1_slice_header_s:consumed_bits_sel <= `exp_golomb;
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`ref_pic_list_reordering:
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case (ref_pic_list_reordering_state)
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`ref_pic_list_reordering_flag_l0_s:consumed_bits_sel <= `fixed_length;
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default :consumed_bits_sel <= `rst_consumed_bits_sel;
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endcase
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`dec_ref_pic_marking:
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case (dec_ref_pic_marking_state)
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`no_output_of_prior_pics_flag_2_long_term_reference_flag:consumed_bits_sel <= `fixed_length;
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`adaptive_ref_pic_marking_mode_flag_s :consumed_bits_sel <= `fixed_length;
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default :consumed_bits_sel <= `rst_consumed_bits_sel;
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endcase
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`slice_qp_delta_s :consumed_bits_sel <= `exp_golomb;
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`disable_deblocking_filter_idc_s:consumed_bits_sel <= `exp_golomb;
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`slice_alpha_c0_offset_div2_s :consumed_bits_sel <= `exp_golomb;
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`slice_beta_offset_div2_s :consumed_bits_sel <= `exp_golomb;
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default :consumed_bits_sel <= `rst_consumed_bits_sel;
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endcase
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else if (slice_data_state != `rst_slice_data)
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case (slice_data_state)
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`mb_skip_run_s :consumed_bits_sel <= `exp_golomb;
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`mb_type_s :consumed_bits_sel <= `exp_golomb;
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`pcm_alignment_zero_bit_s:consumed_bits_sel <= `exp_golomb;
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`pcm_byte_s :consumed_bits_sel <= `pcm_alignment;
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`sub_mb_pred:
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case (sub_mb_pred_state)
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`rst_sub_mb_pred:consumed_bits_sel <= `rst_consumed_bits_sel;
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default :consumed_bits_sel <= `exp_golomb;
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endcase
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`mb_pred:
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case (mb_pred_state)
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`prev_intra4x4_pred_mode_flag_s:consumed_bits_sel <= `fixed_length;
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`rem_intra4x4_pred_mode_s :consumed_bits_sel <= `fixed_length;
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`intra_chroma_pred_mode_s :consumed_bits_sel <= `exp_golomb;
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`ref_idx_l0_s :consumed_bits_sel <= `exp_golomb;
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`mvd_l0_s :consumed_bits_sel <= `exp_golomb;
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default :consumed_bits_sel <= `rst_consumed_bits_sel;
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endcase
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`coded_block_pattern_s:consumed_bits_sel <= `exp_golomb;
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`mb_qp_delta_s :consumed_bits_sel <= `exp_golomb;
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`residual :consumed_bits_sel <= `cavlc_consumed;
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default :consumed_bits_sel <= `rst_consumed_bits_sel;
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endcase
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else if (seq_parameter_set_state != `rst_seq_parameter_set)
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case (seq_parameter_set_state)
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`fixed_header :consumed_bits_sel <= `fixed_length;
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`level_idc_s :consumed_bits_sel <= `fixed_length;
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`seq_parameter_set_id_sps_s :consumed_bits_sel <= `exp_golomb;
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`log2_max_frame_num_minus4_s :consumed_bits_sel <= `exp_golomb;
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`pic_order_cnt_type_s :consumed_bits_sel <= `exp_golomb;
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`log2_max_pic_order_cnt_lsb_minus4_s :consumed_bits_sel <= `exp_golomb;
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`num_ref_frames_s :consumed_bits_sel <= `exp_golomb;
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`gaps_in_frame_num_value_allowed_flag_s :consumed_bits_sel <= `fixed_length;
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`pic_width_in_mbs_minus1_s :consumed_bits_sel <= `exp_golomb;
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`pic_height_in_map_units_minus1_s :consumed_bits_sel <= `exp_golomb;
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`frame_mbs_only_flag_2_frame_cropping_flag:consumed_bits_sel <= `fixed_length;
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`vui_parameter_present_flag_s :consumed_bits_sel <= `fixed_length;
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default :consumed_bits_sel <= `rst_consumed_bits_sel;
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endcase
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else if (pic_parameter_set_state != `rst_pic_parameter_set)
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case (pic_parameter_set_state)
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`pic_parameter_set_id_pps_s :consumed_bits_sel <= `exp_golomb;
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`seq_parameter_set_id_pps_s :consumed_bits_sel <= `exp_golomb;
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`entropy_coding_mode_flag_2_pic_order_present_flag :consumed_bits_sel <= `fixed_length;
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`num_slice_groups_minus1_s :consumed_bits_sel <= `exp_golomb;
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`num_ref_idx_l0_active_minus1_pps_s :consumed_bits_sel <= `exp_golomb;
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`num_ref_idx_l1_active_minus1_pps_s :consumed_bits_sel <= `exp_golomb;
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`weighted_pred_flag_2_weighted_bipred_idc :consumed_bits_sel <= `fixed_length;
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`pic_init_qp_minus26_s :consumed_bits_sel <= `exp_golomb;
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`pic_init_qs_minus26_s :consumed_bits_sel <= `exp_golomb;
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`chroma_qp_index_offset_s :consumed_bits_sel <= `exp_golomb;
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`deblocking_filter_control_2_redundant_pic_cnt_present_flag:consumed_bits_sel <= `fixed_length;
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default :consumed_bits_sel <= `rst_consumed_bits_sel;
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endcase
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else if (nal_unit_state == `rbsp_trailing_one_bit)
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consumed_bits_sel <= `fixed_length;
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else if (nal_unit_state == `rbsp_trailing_zero_bits)
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consumed_bits_sel <= `trailing_bits;
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else
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consumed_bits_sel <= `rst_consumed_bits_sel;
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always @ (reset_n or parser_state or nal_unit_state or slice_header_state or ref_pic_list_reordering_state or
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dec_ref_pic_marking_state or slice_data_state or mb_pred_state or seq_parameter_set_state or pic_parameter_set_state)
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if (reset_n == 0)
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FixedLen <= 0;
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else
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begin
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if (parser_state == `start_code_prefix)
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FixedLen <= 5'd16;
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else if (nal_unit_state == `forbidden_zero_bit_2_nal_unit_type)
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FixedLen <= 8;
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else if (slice_header_state == `num_ref_idx_active_override_flag_s)
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FixedLen <= 1;
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else if (ref_pic_list_reordering_state == `ref_pic_list_reordering_flag_l0_s)
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FixedLen <= 1;
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else if (dec_ref_pic_marking_state == `no_output_of_prior_pics_flag_2_long_term_reference_flag)
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FixedLen <= 2;
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else if (dec_ref_pic_marking_state == `adaptive_ref_pic_marking_mode_flag_s)
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FixedLen <= 1;
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else if (slice_data_state == `pcm_byte_s)
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FixedLen <= 5'd16;
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else if (mb_pred_state == `prev_intra4x4_pred_mode_flag_s)
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FixedLen <= 1;
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else if (mb_pred_state == `rem_intra4x4_pred_mode_s)
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FixedLen <= 3;
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else if (seq_parameter_set_state == `fixed_header)
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FixedLen <= 5'd16;
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else if (seq_parameter_set_state == `level_idc_s)
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FixedLen <= 8;
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else if (seq_parameter_set_state == `gaps_in_frame_num_value_allowed_flag_s)
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FixedLen <= 1;
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else if (seq_parameter_set_state == `frame_mbs_only_flag_2_frame_cropping_flag)
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FixedLen <= 3;
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else if (seq_parameter_set_state == `vui_parameter_present_flag_s)
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FixedLen <= 1;
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else if (pic_parameter_set_state == `entropy_coding_mode_flag_2_pic_order_present_flag)
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FixedLen <= 2;
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else if (pic_parameter_set_state == `weighted_pred_flag_2_weighted_bipred_idc)
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FixedLen <= 3;
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else if (pic_parameter_set_state == `deblocking_filter_control_2_redundant_pic_cnt_present_flag)
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FixedLen <= 3;
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else if (nal_unit_state == `rbsp_trailing_one_bit)
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FixedLen <= 1;
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else
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FixedLen <= 1;
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end
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reg [6:0] pc_reg;
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always @ (consumed_bits_sel or pc_reg or exp_golomb_len or dependent_variable_len or
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cavlc_consumed_bits_len or FixedLen)
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case (consumed_bits_sel)
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`exp_golomb :pc <= pc_reg + exp_golomb_len;
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`dependent_variable:pc <= pc_reg + dependent_variable_len;
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`cavlc_consumed :pc <= pc_reg + cavlc_consumed_bits_len;
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`fixed_length :pc <= pc_reg + FixedLen;
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`trailing_bits :pc <= (pc_reg[2:0] == 3'b000)? pc_reg:{{pc_reg[6:3] + 1},3'b0};
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`pcm_alignment :pc <= (pc_reg[2:0] == 3'b000)? pc_reg:{{pc_reg[6:3] + 1},3'b0};
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default :pc <= pc_reg;
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endcase
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always @ (posedge clk)
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pc_reg <= (reset_n == 0)? 0:pc;
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endmodule
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