bs_decoding.v

a H.264/AVC Baseline Decoder

			
					
	always @ (end_of_MB_DEC or disable_DF or bs_dec_counter or mb_type_general_DF
		or mb_num_v or MBTypeGen_mbAddrB or MB_inter_size 
		or mbAddrB_mvx or mvx_CurrMb0 or mvx_CurrMb1 or mvx_CurrMb2 or mvx_CurrMb3
		or mbAddrB_mvy or mvy_CurrMb0 or mvy_CurrMb1 or mvy_CurrMb2 or mvy_CurrMb3)
		if ((end_of_MB_DEC && disable_DF == 1'b0) || bs_dec_counter != 0)
			begin
				//-----------------------
				//Current MB is P_skip
				//-----------------------
				if (mb_type_general_DF == `MB_P_skip && bs_dec_counter == 2'b00)	//H0
					begin
						if (mb_num_v != 0 && MBTypeGen_mbAddrB == `MB_addrA_addrB_P_skip)		//mbAddrB is P_skip
							begin 
								mvx_H0_diff_a <= mbAddrB_mvx[31:24]; mvx_H0_diff_b <= mvx_CurrMb0[7:0];
								mvx_H1_diff_a <= 0; mvx_H1_diff_b <= 0;	 
								mvx_H2_diff_a <= 0; mvx_H2_diff_b <= 0;
								mvx_H3_diff_a <= 0; mvx_H3_diff_b <= 0;	
								mvy_H0_diff_a <= mbAddrB_mvy[31:24]; mvy_H0_diff_b <= mvy_CurrMb0[7:0];
								mvy_H1_diff_a <= 0; mvy_H1_diff_b <= 0;	 
								mvy_H2_diff_a <= 0; mvy_H2_diff_b <= 0;
								mvy_H3_diff_a <= 0; mvy_H3_diff_b <= 0;
							end 
						else if (mb_num_v != 0 && MBTypeGen_mbAddrB == 2'b00)	//mbAddrB is Inter
							begin
								mvx_H0_diff_a <= mbAddrB_mvx[31:24]; mvx_H0_diff_b <= mvx_CurrMb0[7:0];
								mvx_H1_diff_a <= mbAddrB_mvx[23:16]; mvx_H1_diff_b <= mvx_CurrMb0[7:0];
								mvx_H2_diff_a <= mbAddrB_mvx[15:8];  mvx_H2_diff_b <= mvx_CurrMb0[7:0];
								mvx_H3_diff_a <= mbAddrB_mvx[7:0];   mvx_H3_diff_b <= mvx_CurrMb0[7:0];
								mvy_H0_diff_a <= mbAddrB_mvy[31:24]; mvy_H0_diff_b <= mvy_CurrMb0[7:0];
								mvy_H1_diff_a <= mbAddrB_mvy[23:16]; mvy_H1_diff_b <= mvy_CurrMb0[7:0];
								mvy_H2_diff_a <= mbAddrB_mvy[15:8];  mvy_H2_diff_b <= mvy_CurrMb0[7:0];
								mvy_H3_diff_a <= mbAddrB_mvy[7:0];   mvy_H3_diff_b <= mvy_CurrMb0[7:0];
							end
						else	
							begin 
								mvx_H0_diff_a <= 0; mvx_H0_diff_b <= 0;
								mvx_H1_diff_a <= 0; mvx_H1_diff_b <= 0;	 
								mvx_H2_diff_a <= 0; mvx_H2_diff_b <= 0;
								mvx_H3_diff_a <= 0; mvx_H3_diff_b <= 0;	
								mvy_H0_diff_a <= 0; mvy_H0_diff_b <= 0;
								mvy_H1_diff_a <= 0; mvy_H1_diff_b <= 0;	 
								mvy_H2_diff_a <= 0; mvy_H2_diff_b <= 0;
								mvy_H3_diff_a <= 0; mvy_H3_diff_b <= 0;
							end
					end	
				//-----------------------
				//Current MB is Inter
				//-----------------------
				else if (mb_type_general_DF[3] == 1'b0)
					case (bs_dec_counter)
						2'b00:	//H0
						if (mb_num_v != 0 && (MBTypeGen_mbAddrB[1] == 1'b0))//mbAddrB is P_skip or Inter
							begin
								mvx_H0_diff_a <= mbAddrB_mvx[31:24]; mvx_H0_diff_b <= mvx_CurrMb0[7:0];
								
								mvx_H1_diff_a <= mbAddrB_mvx[23:16]; 
								mvx_H1_diff_b <= (MB_inter_size == `I16x16)? mvx_CurrMb0[7:0]:mvx_CurrMb0[15:8];
								
								mvx_H2_diff_a <= mbAddrB_mvx[15:8];  
								mvx_H2_diff_b <= (MB_inter_size == `I16x16)? mvx_CurrMb0[7:0]:mvx_CurrMb1[7:0];
								
								mvx_H3_diff_a <= mbAddrB_mvx[7:0];   
								mvx_H3_diff_b <= (MB_inter_size == `I16x16)? mvx_CurrMb0[7:0]:mvx_CurrMb1[15:8];
								
								mvy_H0_diff_a <= mbAddrB_mvy[31:24]; mvy_H0_diff_b <= mvy_CurrMb0[7:0];
								
								mvy_H1_diff_a <= mbAddrB_mvy[23:16]; 
								mvy_H1_diff_b <= (MB_inter_size == `I16x16)? mvy_CurrMb0[7:0]:mvy_CurrMb0[15:8];
								
								mvy_H2_diff_a <= mbAddrB_mvy[15:8];  
								mvy_H2_diff_b <= (MB_inter_size == `I16x16)? mvy_CurrMb0[7:0]:mvy_CurrMb1[7:0];
								
								mvy_H3_diff_a <= mbAddrB_mvy[7:0];   
								mvy_H3_diff_b <= (MB_inter_size == `I16x16)? mvy_CurrMb0[7:0]:mvy_CurrMb1[15:8];
							end
						else
							begin 
								mvx_H0_diff_a <= 0; mvx_H0_diff_b <= 0;
								mvx_H1_diff_a <= 0; mvx_H1_diff_b <= 0;	 
								mvx_H2_diff_a <= 0; mvx_H2_diff_b <= 0;
								mvx_H3_diff_a <= 0; mvx_H3_diff_b <= 0;	
								mvy_H0_diff_a <= 0; mvy_H0_diff_b <= 0;
								mvy_H1_diff_a <= 0; mvy_H1_diff_b <= 0;	 
								mvy_H2_diff_a <= 0; mvy_H2_diff_b <= 0;
								mvy_H3_diff_a <= 0; mvy_H3_diff_b <= 0;
							end
						2'b11:	//H1
						begin
							mvx_H0_diff_a <= (MB_inter_size != `I8x8)? 0:mvx_CurrMb0[7:0];  
							mvx_H0_diff_b <= (MB_inter_size != `I8x8)? 0:mvx_CurrMb0[23:16];
							mvx_H1_diff_a <= (MB_inter_size != `I8x8)? 0:mvx_CurrMb0[15:8]; 
							mvx_H1_diff_b <= (MB_inter_size != `I8x8)? 0:mvx_CurrMb0[31:24];
							mvx_H2_diff_a <= (MB_inter_size != `I8x8)? 0:mvx_CurrMb1[7:0];
							mvx_H2_diff_b <= (MB_inter_size != `I8x8)? 0:mvx_CurrMb1[23:16];
							mvx_H3_diff_a <= (MB_inter_size != `I8x8)? 0:mvx_CurrMb1[15:8];
							mvx_H3_diff_b <= (MB_inter_size != `I8x8)? 0:mvx_CurrMb1[31:24];	
							
							mvy_H0_diff_a <= (MB_inter_size != `I8x8)? 0:mvy_CurrMb0[7:0];  
							mvy_H0_diff_b <= (MB_inter_size != `I8x8)? 0:mvy_CurrMb0[23:16];
							mvy_H1_diff_a <= (MB_inter_size != `I8x8)? 0:mvy_CurrMb0[15:8]; 
							mvy_H1_diff_b <= (MB_inter_size != `I8x8)? 0:mvy_CurrMb0[31:24];
							mvy_H2_diff_a <= (MB_inter_size != `I8x8)? 0:mvy_CurrMb1[7:0];
							mvy_H2_diff_b <= (MB_inter_size != `I8x8)? 0:mvy_CurrMb1[23:16];
							mvy_H3_diff_a <= (MB_inter_size != `I8x8)? 0:mvy_CurrMb1[15:8];
							mvy_H3_diff_b <= (MB_inter_size != `I8x8)? 0:mvy_CurrMb1[31:24];	
						end
						2'b10:	//H2
						begin
							mvx_H0_diff_a <= (MB_inter_size == `I16x16 || MB_inter_size == `I8x16)? 0:mvx_CurrMb0[23:16];  
							mvx_H0_diff_b <= (MB_inter_size == `I16x16 || MB_inter_size == `I8x16)? 0:mvx_CurrMb2[7:0];
							mvx_H1_diff_a <= (MB_inter_size == `I16x16 || MB_inter_size == `I8x16)? 0:mvx_CurrMb0[31:24]; 
							mvx_H1_diff_b <= (MB_inter_size == `I16x16 || MB_inter_size == `I8x16)? 0:mvx_CurrMb2[15:8];
							mvx_H2_diff_a <= (MB_inter_size == `I16x16 || MB_inter_size == `I8x16)? 0:mvx_CurrMb1[23:16];
							mvx_H2_diff_b <= (MB_inter_size == `I16x16 || MB_inter_size == `I8x16)? 0:mvx_CurrMb3[7:0];
							mvx_H3_diff_a <= (MB_inter_size == `I16x16 || MB_inter_size == `I8x16)? 0:mvx_CurrMb1[31:24];
							mvx_H3_diff_b <= (MB_inter_size == `I16x16 || MB_inter_size == `I8x16)? 0:mvx_CurrMb3[15:8]; 
							
							mvy_H0_diff_a <= (MB_inter_size == `I16x16 || MB_inter_size == `I8x16)? 0:mvy_CurrMb0[23:16];  
							mvy_H0_diff_b <= (MB_inter_size == `I16x16 || MB_inter_size == `I8x16)? 0:mvy_CurrMb2[7:0];
							mvy_H1_diff_a <= (MB_inter_size == `I16x16 || MB_inter_size == `I8x16)? 0:mvy_CurrMb0[31:24]; 
							mvy_H1_diff_b <= (MB_inter_size == `I16x16 || MB_inter_size == `I8x16)? 0:mvy_CurrMb2[15:8];
							mvy_H2_diff_a <= (MB_inter_size == `I16x16 || MB_inter_size == `I8x16)? 0:mvy_CurrMb1[23:16];
							mvy_H2_diff_b <= (MB_inter_size == `I16x16 || MB_inter_size == `I8x16)? 0:mvy_CurrMb3[7:0];
							mvy_H3_diff_a <= (MB_inter_size == `I16x16 || MB_inter_size == `I8x16)? 0:mvy_CurrMb1[31:24];
							mvy_H3_diff_b <= (MB_inter_size == `I16x16 || MB_inter_size == `I8x16)? 0:mvy_CurrMb3[15:8]; 
							
						end
						2'b01:	//H3
						begin
							mvx_H0_diff_a <= (MB_inter_size != `I8x8)? 0:mvx_CurrMb2[7:0];  
							mvx_H0_diff_b <= (MB_inter_size != `I8x8)? 0:mvx_CurrMb2[23:16];
							mvx_H1_diff_a <= (MB_inter_size != `I8x8)? 0:mvx_CurrMb2[15:8]; 
							mvx_H1_diff_b <= (MB_inter_size != `I8x8)? 0:mvx_CurrMb2[31:24];
							mvx_H2_diff_a <= (MB_inter_size != `I8x8)? 0:mvx_CurrMb3[7:0];
							mvx_H2_diff_b <= (MB_inter_size != `I8x8)? 0:mvx_CurrMb3[23:16];
							mvx_H3_diff_a <= (MB_inter_size != `I8x8)? 0:mvx_CurrMb3[15:8];
							mvx_H3_diff_b <= (MB_inter_size != `I8x8)? 0:mvx_CurrMb3[31:24];
							
							mvy_H0_diff_a <= (MB_inter_size != `I8x8)? 0:mvy_CurrMb2[7:0];  
							mvy_H0_diff_b <= (MB_inter_size != `I8x8)? 0:mvy_CurrMb2[23:16];
							mvy_H1_diff_a <= (MB_inter_size != `I8x8)? 0:mvy_CurrMb2[15:8]; 
							mvy_H1_diff_b <= (MB_inter_size != `I8x8)? 0:mvy_CurrMb2[31:24];
							mvy_H2_diff_a <= (MB_inter_size != `I8x8)? 0:mvy_CurrMb3[7:0];
							mvy_H2_diff_b <= (MB_inter_size != `I8x8)? 0:mvy_CurrMb3[23:16];
							mvy_H3_diff_a <= (MB_inter_size != `I8x8)? 0:mvy_CurrMb3[15:8];
							mvy_H3_diff_b <= (MB_inter_size != `I8x8)? 0:mvy_CurrMb3[31:24];
						end	
					endcase
				else
					begin 
						mvx_H0_diff_a <= 0; mvx_H0_diff_b <= 0;
						mvx_H1_diff_a <= 0; mvx_H1_diff_b <= 0;	 
						mvx_H2_diff_a <= 0; mvx_H2_diff_b <= 0;
						mvx_H3_diff_a <= 0; mvx_H3_diff_b <= 0;
						mvy_H0_diff_a <= 0; mvy_H0_diff_b <= 0;
						mvy_H1_diff_a <= 0; mvy_H1_diff_b <= 0;	 
						mvy_H2_diff_a <= 0; mvy_H2_diff_b <= 0;
						mvy_H3_diff_a <= 0; mvy_H3_diff_b <= 0;
					end
			end
		else
			begin 
				mvx_H0_diff_a <= 0; mvx_H0_diff_b <= 0;
				mvx_H1_diff_a <= 0; mvx_H1_diff_b <= 0;	 
				mvx_H2_diff_a <= 0; mvx_H2_diff_b <= 0;
				mvx_H3_diff_a <= 0; mvx_H3_diff_b <= 0;
				mvy_H0_diff_a <= 0; mvy_H0_diff_b <= 0;
				mvy_H1_diff_a <= 0; mvy_H1_diff_b <= 0;	 
				mvy_H2_diff_a <= 0; mvy_H2_diff_b <= 0;
				mvy_H3_diff_a <= 0; mvy_H3_diff_b <= 0;
			end
	/*		
	// synopsys translate_off
	integer	tracefile;
	integer pic_num;
	wire [6:0] mb_num;
	assign mb_num = mb_num_v * 11 + mb_num_h;
	
	initial
		begin
			tracefile = $fopen("bs_trace.txt");
		end
	reg bs_dec_will_end;
	always @ (posedge clk)
		if (bs_dec_counter == 2'b01)
			bs_dec_will_end <= 1'b1;
		else
			bs_dec_will_end <= 1'b0;
	always @ (posedge clk or negedge reset_n)
		if (reset_n == 1'b0)
			pic_num <= 0;
		else if (bs_dec_will_end)
			begin
				$fdisplay (tracefile, "-------------------------------");
				if (mb_num == 0)
					$fdisplay (tracefile, " Pic_num = %3d,MB_num =  98",(pic_num - 1));
				else
					$fdisplay (tracefile, " Pic_num = %3d,MB_num = %3d",pic_num,(mb_num - 1));
				$fdisplay (tracefile, " Vertical   Edge 0:Bs = %d,%d,%d,%d",bs_V0[2:0],bs_V0[5:3],bs_V0[8:6],bs_V0[11:9]);
				$fdisplay (tracefile, " Vertical   Edge 1:Bs = %d,%d,%d,%d",bs_V1[2:0],bs_V1[5:3],bs_V1[8:6],bs_V1[11:9]);
				$fdisplay (tracefile, " Vertical   Edge 2:Bs = %d,%d,%d,%d",bs_V2[2:0],bs_V2[5:3],bs_V2[8:6],bs_V2[11:9]);
				$fdisplay (tracefile, " Vertical   Edge 3:Bs = %d,%d,%d,%d",bs_V3[2:0],bs_V3[5:3],bs_V3[8:6],bs_V3[11:9]);
				$fdisplay (tracefile, " Horizontal Edge 0:Bs = %d,%d,%d,%d",bs_H0[2:0],bs_H0[5:3],bs_H0[8:6],bs_H0[11:9]);
				$fdisplay (tracefile, " Horizontal Edge 1:Bs = %d,%d,%d,%d",bs_H1[2:0],bs_H1[5:3],bs_H1[8:6],bs_H1[11:9]);
				$fdisplay (tracefile, " Horizontal Edge 2:Bs = %d,%d,%d,%d",bs_H2[2:0],bs_H2[5:3],bs_H2[8:6],bs_H2[11:9]);
				$fdisplay (tracefile, " Horizontal Edge 3:Bs = %d,%d,%d,%d",bs_H3[2:0],bs_H3[5:3],bs_H3[8:6],bs_H3[11:9]);
				if (mb_num == 98)
					pic_num <= pic_num + 1;
			end
	// synopsys translate_on
	*/
endmodule			

module mv_diff_GE4 (mv_a,mv_b,diff_GE4);
	input [7:0] mv_a,mv_b;
	output diff_GE4;
	wire [7:0] diff_tmp;
	wire [6:0] diff;
	assign diff_tmp = mv_a + ~ mv_b + 1;
	assign diff	= (diff_tmp[7] == 1'b1)? (~diff_tmp[6:0] + 1):diff_tmp[6:0];
	assign diff_GE4 = (diff[6:2] != 0)? 1'b1:1'b0;
endmodule