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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 : CodedBlockPattern_decoding.v
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// Generated : June 5,2005
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// Copyright (C) 2008 Ke Xu
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//-------------------------------------------------------------------------------------------------
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// Description
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// Decoding CodedBlockPatternLuma & CodedBlockPatternChroma (Table9-4 Page156 of H.264/AVC standard 2003)
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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 CodedBlockPattern_decoding (clk,reset_n,slice_data_state,slice_type,mb_type,mb_type_general,
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exp_golomb_decoding_output_5to0,CodedBlockPatternLuma,CodedBlockPatternChroma);
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input clk,reset_n;
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input [3:0] slice_data_state;
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input [2:0] slice_type;
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input [4:0] mb_type;
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input [3:0] mb_type_general;
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input [5:0] exp_golomb_decoding_output_5to0;
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output [3:0] CodedBlockPatternLuma;
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output [1:0] CodedBlockPatternChroma;
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reg [3:0] CodedBlockPatternLuma;
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reg [1:0] CodedBlockPatternChroma;
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reg [3:0] CodedBlockPatternLuma_reg;
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reg [1:0] CodedBlockPatternChroma_reg;
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always @ (posedge clk)
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CodedBlockPatternLuma_reg <= (reset_n == 0)? 0:CodedBlockPatternLuma;
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always @ (posedge clk)
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CodedBlockPatternChroma_reg <= (reset_n == 0)? 0:CodedBlockPatternChroma;
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always @ (slice_data_state or mb_type_general or slice_type or mb_type or exp_golomb_decoding_output_5to0
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or CodedBlockPatternLuma_reg)
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if (mb_type_general[3:2] == 2'b10)//Intra16x16
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begin
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if (slice_type == 0 || slice_type == 5) //P_slice
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CodedBlockPatternLuma <= (mb_type < 18)? 4'd0:4'd15;
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else //I_slice
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CodedBlockPatternLuma <= (mb_type < 13)? 4'd0:4'd15;
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end
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else if (slice_data_state == `coded_block_pattern_s)
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case (mb_type_general[3])
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1'b0: //Inter
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if (exp_golomb_decoding_output_5to0 < 2) //CBP = 0,16
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CodedBlockPatternLuma <= 0;
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else if (exp_golomb_decoding_output_5to0 < 6) //CBP =1,2,4,8
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case (exp_golomb_decoding_output_5to0[2:0])
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3'b010:CodedBlockPatternLuma <= 4'd1;
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3'b011:CodedBlockPatternLuma <= 4'd2;
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3'b100:CodedBlockPatternLuma <= 4'd4;
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3'b101:CodedBlockPatternLuma <= 4'd8;
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default:CodedBlockPatternLuma <= CodedBlockPatternLuma_reg;
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endcase
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else
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case (exp_golomb_decoding_output_5to0)
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6 :CodedBlockPatternLuma <= 4'd0;
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24,32 :CodedBlockPatternLuma <= 4'd1;
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25,33 :CodedBlockPatternLuma <= 4'd2;
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7,20,36 :CodedBlockPatternLuma <= 4'd3;
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26,34 :CodedBlockPatternLuma <= 4'd4;
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8,21,37 :CodedBlockPatternLuma <= 4'd5;
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17,44,46:CodedBlockPatternLuma <= 4'd6;
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13,28,40:CodedBlockPatternLuma <= 4'd7;
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27,35 :CodedBlockPatternLuma <= 4'd8;
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18,45,47:CodedBlockPatternLuma <= 4'd9;
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9,22,38 :CodedBlockPatternLuma <= 4'd10;
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14,29,41:CodedBlockPatternLuma <= 4'd11;
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10,23,39:CodedBlockPatternLuma <= 4'd12;
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15,30,42:CodedBlockPatternLuma <= 4'd13;
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16,31,43:CodedBlockPatternLuma <= 4'd14;
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11,12,19:CodedBlockPatternLuma <= 4'd15;
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default :CodedBlockPatternLuma <= CodedBlockPatternLuma_reg;
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endcase
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1'b1: //Intra4x4
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if (exp_golomb_decoding_output_5to0 < 3) //CBP = 47,31,15
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CodedBlockPatternLuma <= 4'd15;
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else
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case (exp_golomb_decoding_output_5to0)
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3,16,41 :CodedBlockPatternLuma <= 4'd0;
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29,33,42:CodedBlockPatternLuma <= 4'd1;
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30,34,43:CodedBlockPatternLuma <= 4'd2;
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17,21,25:CodedBlockPatternLuma <= 4'd3;
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31,35,44:CodedBlockPatternLuma <= 4'd4;
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18,22,26:CodedBlockPatternLuma <= 4'd5;
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37,39,46:CodedBlockPatternLuma <= 4'd6;
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4,8,12 :CodedBlockPatternLuma <= 4'd7;
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32,36,45:CodedBlockPatternLuma <= 4'd8;
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38,40,47:CodedBlockPatternLuma <= 4'd9;
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19,23,27:CodedBlockPatternLuma <= 4'd10;
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5,9,13 :CodedBlockPatternLuma <= 4'd11;
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20,24,28:CodedBlockPatternLuma <= 4'd12;
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6,10,14 :CodedBlockPatternLuma <= 4'd13;
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7,11,15 :CodedBlockPatternLuma <= 4'd14;
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default :CodedBlockPatternLuma <= CodedBlockPatternLuma_reg;
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endcase
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endcase
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else
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CodedBlockPatternLuma <= CodedBlockPatternLuma_reg;
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always @ (slice_data_state or mb_type_general or exp_golomb_decoding_output_5to0 or CodedBlockPatternChroma_reg)
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if (mb_type_general[3:2] == 2'b10)//Intra16x16
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CodedBlockPatternChroma <= mb_type_general[1:0];
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else if (slice_data_state == `coded_block_pattern_s)
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case (mb_type_general[3])
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1'b0: //Inter
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if (exp_golomb_decoding_output_5to0 < 2) //CBP = 0,16
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CodedBlockPatternChroma <= {1'b0,exp_golomb_decoding_output_5to0[0]};
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else if (exp_golomb_decoding_output_5to0 < 6) //CBP =1,2,4,8
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CodedBlockPatternChroma <= 2'd0;
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else
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case (exp_golomb_decoding_output_5to0)
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7,8,9,10,11,13,14,15,16,17,18 :CodedBlockPatternChroma <= 2'd0;
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19,32,33,34,35,36,37,38,39,40,41,42,43,44,45:CodedBlockPatternChroma <= 2'd1;
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default :CodedBlockPatternChroma <= 2'd2;
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endcase
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1'b1: //Intra4x4
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if (exp_golomb_decoding_output_5to0 < 3) //CBP = 47,31,15
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case (exp_golomb_decoding_output_5to0[1:0])
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2'b00 :CodedBlockPatternChroma <= 2'd2;
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2'b01 :CodedBlockPatternChroma <= 2'd1;
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default:CodedBlockPatternChroma <= 2'd0;
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endcase
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else
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case (exp_golomb_decoding_output_5to0)
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3,8,9,10,11,17,18,19,20,29,30,31,32,37,38:CodedBlockPatternChroma <= 2'd0;
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4,5,6,7,16,21,22,23,24,33,34,35,36,39,40 :CodedBlockPatternChroma <= 2'd1;
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default :CodedBlockPatternChroma <= 2'd2;
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endcase
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endcase
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else
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CodedBlockPatternChroma <= CodedBlockPatternChroma_reg;
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endmodule
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