//--------------------------------------------------------------------------------------------------
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//--------------------------------------------------------------------------------------------------
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// Design : nova
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// Design : nova
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// Author(s) : Ke Xu
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// Author(s) : Ke Xu
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// Email : eexuke@yahoo.com
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// Email : eexuke@yahoo.com
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// File : exp_golomb_decoding.v
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// File : exp_golomb_decoding.v
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// Generated : June 6, 2005
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// Generated : June 6, 2005
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// Copyright (C) 2008 Ke Xu
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// Copyright (C) 2008 Ke Xu
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//-------------------------------------------------------------------------------------------------
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//-------------------------------------------------------------------------------------------------
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// Description
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// Description
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// Exp-Golomb code decoding
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// Exp-Golomb code decoding
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//-------------------------------------------------------------------------------------------------
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//-------------------------------------------------------------------------------------------------
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// synopsys translate_off
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// synopsys translate_off
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`include "timescale.v"
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`include "timescale.v"
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// synopsys translate_on
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// synopsys translate_on
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`include "nova_defines.v"
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`include "nova_defines.v"
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module exp_golomb_decoding (reset_n,heading_one_pos,BitStream_buffer_output,num_ref_idx_l0_active_minus1,
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module exp_golomb_decoding (reset_n,heading_one_pos,BitStream_buffer_output,num_ref_idx_l0_active_minus1,
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slice_header_state,slice_data_state,mb_pred_state,sub_mb_pred_state,
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slice_header_state,slice_data_state,mb_pred_state,sub_mb_pred_state,
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seq_parameter_set_state,pic_parameter_set_state,exp_golomb_decoding_output,exp_golomb_len);
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seq_parameter_set_state,pic_parameter_set_state,exp_golomb_decoding_output,exp_golomb_len);
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input reset_n;
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input reset_n;
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input [3:0] heading_one_pos;
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input [3:0] heading_one_pos;
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input [15:0] BitStream_buffer_output;
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input [15:0] BitStream_buffer_output;
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input [2:0] num_ref_idx_l0_active_minus1;
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input [2:0] num_ref_idx_l0_active_minus1;
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input [3:0] slice_header_state;
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input [3:0] slice_header_state;
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input [3:0] slice_data_state;
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input [3:0] slice_data_state;
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input [2:0] mb_pred_state;
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input [2:0] mb_pred_state;
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input [1:0] sub_mb_pred_state;
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input [1:0] sub_mb_pred_state;
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input [3:0] seq_parameter_set_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] pic_parameter_set_state;
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output [7:0] exp_golomb_decoding_output;
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output [7:0] exp_golomb_decoding_output;
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output [3:0] exp_golomb_len;
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output [3:0] exp_golomb_len;
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reg [7:0] exp_golomb_decoding_output;
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reg [7:0] exp_golomb_decoding_output;
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reg [3:0] exp_golomb_len;
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reg [3:0] exp_golomb_len;
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parameter rst_exp_golomb_sel = 2'b00;
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parameter rst_exp_golomb_sel = 2'b00;
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parameter ue = 2'b01;
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parameter ue = 2'b01;
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parameter se = 2'b10;
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parameter se = 2'b10;
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parameter te = 2'b11;
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parameter te = 2'b11;
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reg [7:0] codeNum;
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reg [7:0] codeNum;
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reg [1:0] exp_golomb_sel;
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reg [1:0] exp_golomb_sel;
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always @ (exp_golomb_sel or heading_one_pos or BitStream_buffer_output)
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always @ (exp_golomb_sel or heading_one_pos or BitStream_buffer_output)
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if (exp_golomb_sel != rst_exp_golomb_sel)
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if (exp_golomb_sel != rst_exp_golomb_sel)
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case (heading_one_pos)
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case (heading_one_pos)
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0:codeNum <= 0;
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0:codeNum <= 0;
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1:codeNum <= {6'b0,BitStream_buffer_output[14:13]} - 1;
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1:codeNum <= {6'b0,BitStream_buffer_output[14:13]} - 1;
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2:codeNum <= {5'b0,BitStream_buffer_output[13:11]} - 1;
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2:codeNum <= {5'b0,BitStream_buffer_output[13:11]} - 1;
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3:codeNum <= {4'b0,BitStream_buffer_output[12:9]} - 1;
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3:codeNum <= {4'b0,BitStream_buffer_output[12:9]} - 1;
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4:codeNum <= {3'b0,BitStream_buffer_output[11:7]} - 1;
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4:codeNum <= {3'b0,BitStream_buffer_output[11:7]} - 1;
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5:codeNum <= {2'b0,BitStream_buffer_output[10:5]} - 1;
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5:codeNum <= {2'b0,BitStream_buffer_output[10:5]} - 1;
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6:codeNum <= {1'b0,BitStream_buffer_output[9:3]} - 1;
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6:codeNum <= {1'b0,BitStream_buffer_output[9:3]} - 1;
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7:codeNum <= BitStream_buffer_output[8:1] - 1;
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7:codeNum <= BitStream_buffer_output[8:1] - 1;
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default:codeNum <= 0;
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default:codeNum <= 0;
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endcase
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endcase
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else
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else
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codeNum <= 0;
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codeNum <= 0;
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wire [2:0] te_range;
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wire [2:0] te_range;
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assign te_range = num_ref_idx_l0_active_minus1 + 1;
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assign te_range = num_ref_idx_l0_active_minus1 + 1;
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always @ (exp_golomb_sel or heading_one_pos or te_range)
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always @ (exp_golomb_sel or heading_one_pos or te_range)
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case (exp_golomb_sel)
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case (exp_golomb_sel)
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ue,se:exp_golomb_len <= (heading_one_pos << 1) + 1;
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ue,se:exp_golomb_len <= (heading_one_pos << 1) + 1;
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te :exp_golomb_len <= (te_range == 2)? 1:((heading_one_pos << 1) + 1);
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te :exp_golomb_len <= (te_range == 2)? 1:((heading_one_pos << 1) + 1);
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default:exp_golomb_len <= 0;
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default:exp_golomb_len <= 0;
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endcase
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endcase
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wire [7:0] codeNum_se_tmp;
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wire [7:0] codeNum_se_tmp;
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assign codeNum_se_tmp = codeNum >> 1;
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assign codeNum_se_tmp = codeNum >> 1;
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always @ (exp_golomb_sel or codeNum or codeNum_se_tmp or te_range)
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always @ (exp_golomb_sel or codeNum or codeNum_se_tmp or te_range)
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case (exp_golomb_sel)
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case (exp_golomb_sel)
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ue:exp_golomb_decoding_output <= codeNum;
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ue:exp_golomb_decoding_output <= codeNum;
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se:
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se:
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case (codeNum[0])
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case (codeNum[0])
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1:exp_golomb_decoding_output <= (codeNum + 1) >> 1;
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1:exp_golomb_decoding_output <= (codeNum + 1) >> 1;
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0:exp_golomb_decoding_output <= ~codeNum_se_tmp + 1;
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0:exp_golomb_decoding_output <= ~codeNum_se_tmp + 1;
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endcase
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endcase
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te:
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te:
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if (te_range == 2) exp_golomb_decoding_output <= (codeNum == 0)? 8'd0:8'd1;
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if (te_range == 2) exp_golomb_decoding_output <= (codeNum == 0)? 8'd0:8'd1;
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else exp_golomb_decoding_output <= codeNum;
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else exp_golomb_decoding_output <= codeNum;
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default:exp_golomb_decoding_output <= 0;
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default:exp_golomb_decoding_output <= 0;
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endcase
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endcase
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always @ (reset_n or slice_header_state or slice_data_state or mb_pred_state or sub_mb_pred_state or
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always @ (reset_n or slice_header_state or slice_data_state or mb_pred_state or sub_mb_pred_state or
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seq_parameter_set_state or pic_parameter_set_state)
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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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if (reset_n == 0)
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exp_golomb_sel <= rst_exp_golomb_sel;
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exp_golomb_sel <= rst_exp_golomb_sel;
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else if (slice_header_state != `rst_slice_header)
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else if (slice_header_state != `rst_slice_header)
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case (slice_header_state)
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case (slice_header_state)
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`first_mb_in_slice_s :exp_golomb_sel <= ue;
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`first_mb_in_slice_s :exp_golomb_sel <= ue;
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`slice_type_s :exp_golomb_sel <= ue;
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`slice_type_s :exp_golomb_sel <= ue;
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`pic_parameter_set_id_slice_header_s:exp_golomb_sel <= ue;
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`pic_parameter_set_id_slice_header_s:exp_golomb_sel <= ue;
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`idr_pic_id_s :exp_golomb_sel <= ue;
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`idr_pic_id_s :exp_golomb_sel <= ue;
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`slice_qp_delta_s :exp_golomb_sel <= se;
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`slice_qp_delta_s :exp_golomb_sel <= se;
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`disable_deblocking_filter_idc_s :exp_golomb_sel <= ue;
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`disable_deblocking_filter_idc_s :exp_golomb_sel <= ue;
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`slice_alpha_c0_offset_div2_s :exp_golomb_sel <= se;
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`slice_alpha_c0_offset_div2_s :exp_golomb_sel <= se;
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`slice_beta_offset_div2_s :exp_golomb_sel <= ue;
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`slice_beta_offset_div2_s :exp_golomb_sel <= ue;
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default :exp_golomb_sel <= rst_exp_golomb_sel;
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default :exp_golomb_sel <= rst_exp_golomb_sel;
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endcase
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endcase
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else if (slice_data_state != `rst_slice_data)
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else if (slice_data_state != `rst_slice_data)
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case (slice_data_state)
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case (slice_data_state)
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`mb_skip_run_s :exp_golomb_sel <= ue;
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`mb_skip_run_s :exp_golomb_sel <= ue;
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`mb_type_s :exp_golomb_sel <= ue;
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`mb_type_s :exp_golomb_sel <= ue;
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`sub_mb_pred:
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`sub_mb_pred:
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case (sub_mb_pred_state)
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case (sub_mb_pred_state)
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`sub_mb_type_s :exp_golomb_sel <= ue;
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`sub_mb_type_s :exp_golomb_sel <= ue;
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`sub_ref_idx_l0_s:exp_golomb_sel <= te;
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`sub_ref_idx_l0_s:exp_golomb_sel <= te;
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`sub_mvd_l0_s :exp_golomb_sel <= se;
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`sub_mvd_l0_s :exp_golomb_sel <= se;
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default :exp_golomb_sel <= rst_exp_golomb_sel;
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default :exp_golomb_sel <= rst_exp_golomb_sel;
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endcase
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endcase
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`mb_pred:
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`mb_pred:
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case (mb_pred_state)
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case (mb_pred_state)
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`intra_chroma_pred_mode_s:exp_golomb_sel <= ue;
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`intra_chroma_pred_mode_s:exp_golomb_sel <= ue;
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`ref_idx_l0_s :exp_golomb_sel <= te;
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`ref_idx_l0_s :exp_golomb_sel <= te;
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`mvd_l0_s :exp_golomb_sel <= se;
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`mvd_l0_s :exp_golomb_sel <= se;
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default :exp_golomb_sel <= rst_exp_golomb_sel;
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default :exp_golomb_sel <= rst_exp_golomb_sel;
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endcase
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endcase
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`coded_block_pattern_s :exp_golomb_sel <= ue;
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`coded_block_pattern_s :exp_golomb_sel <= ue;
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`mb_qp_delta_s :exp_golomb_sel <= se;
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`mb_qp_delta_s :exp_golomb_sel <= se;
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default :exp_golomb_sel <= rst_exp_golomb_sel;
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default :exp_golomb_sel <= rst_exp_golomb_sel;
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endcase
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endcase
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else if (seq_parameter_set_state != `rst_seq_parameter_set)
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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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case (seq_parameter_set_state)
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`seq_parameter_set_id_sps_s :exp_golomb_sel <= ue;
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`seq_parameter_set_id_sps_s :exp_golomb_sel <= ue;
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`log2_max_frame_num_minus4_s :exp_golomb_sel <= ue;
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`log2_max_frame_num_minus4_s :exp_golomb_sel <= ue;
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`pic_order_cnt_type_s :exp_golomb_sel <= ue;
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`pic_order_cnt_type_s :exp_golomb_sel <= ue;
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`log2_max_pic_order_cnt_lsb_minus4_s:exp_golomb_sel <= ue;
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`log2_max_pic_order_cnt_lsb_minus4_s:exp_golomb_sel <= ue;
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`num_ref_frames_s :exp_golomb_sel <= ue;
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`num_ref_frames_s :exp_golomb_sel <= ue;
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`pic_width_in_mbs_minus1_s :exp_golomb_sel <= ue;
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`pic_width_in_mbs_minus1_s :exp_golomb_sel <= ue;
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`pic_height_in_map_units_minus1_s :exp_golomb_sel <= ue;
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`pic_height_in_map_units_minus1_s :exp_golomb_sel <= ue;
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default :exp_golomb_sel <= rst_exp_golomb_sel;
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default :exp_golomb_sel <= rst_exp_golomb_sel;
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endcase
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endcase
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else if (pic_parameter_set_state != `rst_pic_parameter_set)
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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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case (pic_parameter_set_state)
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`pic_parameter_set_id_pps_s :exp_golomb_sel <= ue;
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`pic_parameter_set_id_pps_s :exp_golomb_sel <= ue;
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`seq_parameter_set_id_pps_s :exp_golomb_sel <= ue;
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`seq_parameter_set_id_pps_s :exp_golomb_sel <= ue;
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`num_slice_groups_minus1_s :exp_golomb_sel <= ue;
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`num_slice_groups_minus1_s :exp_golomb_sel <= ue;
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`num_ref_idx_l0_active_minus1_pps_s:exp_golomb_sel <= ue;
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`num_ref_idx_l0_active_minus1_pps_s:exp_golomb_sel <= ue;
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`num_ref_idx_l1_active_minus1_pps_s:exp_golomb_sel <= ue;
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`num_ref_idx_l1_active_minus1_pps_s:exp_golomb_sel <= ue;
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`pic_init_qp_minus26_s :exp_golomb_sel <= se;
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`pic_init_qp_minus26_s :exp_golomb_sel <= se;
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`pic_init_qs_minus26_s :exp_golomb_sel <= se;
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`pic_init_qs_minus26_s :exp_golomb_sel <= se;
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`chroma_qp_index_offset_s :exp_golomb_sel <= se;
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`chroma_qp_index_offset_s :exp_golomb_sel <= se;
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default :exp_golomb_sel <= rst_exp_golomb_sel;
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default :exp_golomb_sel <= rst_exp_golomb_sel;
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endcase
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endcase
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else
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else
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exp_golomb_sel <= rst_exp_golomb_sel;
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exp_golomb_sel <= rst_exp_golomb_sel;
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endmodule
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endmodule
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