inter_pred_sliding_window.v

a H.264/AVC Baseline Decoder

									Inter_pix_copy2 <= 0;	Inter_pix_copy3 <= 0;end
			  	endcase 
				4'b0010:
				case (blk4x4_inter_calculate_counter)
					4'd4:begin	Inter_pix_copy0 <= Inter_ref_02_06;	Inter_pix_copy1 <= Inter_ref_02_07;
								Inter_pix_copy2 <= Inter_ref_02_08;	Inter_pix_copy3 <= Inter_ref_02_09;end
					4'd3:begin	Inter_pix_copy0 <= Inter_ref_03_06;	Inter_pix_copy1 <= Inter_ref_03_07;
								Inter_pix_copy2 <= Inter_ref_03_08;	Inter_pix_copy3 <= Inter_ref_03_09;end
					4'd2:begin	Inter_pix_copy0 <= Inter_ref_04_06;	Inter_pix_copy1 <= Inter_ref_04_07;
								Inter_pix_copy2 <= Inter_ref_04_08;	Inter_pix_copy3 <= Inter_ref_04_09;end
					4'd1:begin	Inter_pix_copy0 <= Inter_ref_05_06;	Inter_pix_copy1 <= Inter_ref_05_07;
								Inter_pix_copy2 <= Inter_ref_05_08;	Inter_pix_copy3 <= Inter_ref_05_09;end
					default:begin	Inter_pix_copy0 <= 0;	Inter_pix_copy1 <= 0;
									Inter_pix_copy2 <= 0;	Inter_pix_copy3 <= 0;end
			  	endcase
				4'b0001:
				case (blk4x4_inter_calculate_counter)
					4'd4:begin	Inter_pix_copy0 <= Inter_ref_06_06;	Inter_pix_copy1 <= Inter_ref_06_07;
								Inter_pix_copy2 <= Inter_ref_06_08;	Inter_pix_copy3 <= Inter_ref_06_09;end
					4'd3:begin	Inter_pix_copy0 <= Inter_ref_07_06;	Inter_pix_copy1 <= Inter_ref_07_07;
								Inter_pix_copy2 <= Inter_ref_07_08;	Inter_pix_copy3 <= Inter_ref_07_09;end
					4'd2:begin	Inter_pix_copy0 <= Inter_ref_08_06;	Inter_pix_copy1 <= Inter_ref_08_07;
								Inter_pix_copy2 <= Inter_ref_08_08;	Inter_pix_copy3 <= Inter_ref_08_09;end
					4'd1:begin	Inter_pix_copy0 <= Inter_ref_09_06;	Inter_pix_copy1 <= Inter_ref_09_07;
								Inter_pix_copy2 <= Inter_ref_09_08;	Inter_pix_copy3 <= Inter_ref_09_09;end
					default:begin	Inter_pix_copy0 <= 0;	Inter_pix_copy1 <= 0;
									Inter_pix_copy2 <= 0;	Inter_pix_copy3 <= 0;end
			  	endcase
				default:begin	Inter_pix_copy0 <= 0;	Inter_pix_copy1 <= 0;
								Inter_pix_copy2 <= 0;	Inter_pix_copy3 <= 0;end
			endcase
		else if (Is_InterChromaCopy)
			case (mv_below8x8_curr)
				1'b1://only one cycle
				begin
					Inter_pix_copy0 <= (blk4x4_inter_calculate_counter != 0)? Inter_ref_00_00:0;
					Inter_pix_copy1 <= (blk4x4_inter_calculate_counter != 0)? Inter_ref_01_00:0;
					Inter_pix_copy2 <= (blk4x4_inter_calculate_counter != 0)? Inter_ref_00_01:0;
					Inter_pix_copy3 <= (blk4x4_inter_calculate_counter != 0)? Inter_ref_01_01:0;
				end
				1'b0://4 cycles,each cycle for one blk2x2 in blk2x2-zig-zag order
					case (blk4x4_inter_calculate_counter)
						4'd4:
						begin 
							Inter_pix_copy0 <= Inter_ref_00_00;	Inter_pix_copy1 <= Inter_ref_01_00;
							Inter_pix_copy2 <= Inter_ref_00_01; Inter_pix_copy3 <= Inter_ref_01_01;
						end
						4'd3:
						begin
							Inter_pix_copy0 <= Inter_ref_02_00; Inter_pix_copy1 <= Inter_ref_03_00;
							Inter_pix_copy2 <= Inter_ref_02_01; Inter_pix_copy3 <= Inter_ref_03_01;
						end
						4'd2:
						begin
							Inter_pix_copy0 <= Inter_ref_00_02; Inter_pix_copy1 <= Inter_ref_01_02;
							Inter_pix_copy2 <= Inter_ref_00_03; Inter_pix_copy3 <= Inter_ref_01_03;
						end
						4'd1:
						begin
							Inter_pix_copy0 <= Inter_ref_02_02; Inter_pix_copy1 <= Inter_ref_03_02;
							Inter_pix_copy2 <= Inter_ref_02_03; Inter_pix_copy3 <= Inter_ref_03_03;
						end
						default:
						begin
							Inter_pix_copy0 <= 0; Inter_pix_copy1 <= 0;	Inter_pix_copy2 <= 0;	Inter_pix_copy3 <= 0;
						end
					endcase
			endcase
		else
			begin	
				Inter_pix_copy0 <= 0; Inter_pix_copy1 <= 0; Inter_pix_copy2 <= 0; Inter_pix_copy3 <= 0; 
			end
	
	//Horizontal sliding windows:Inter_H_window_0_0 ~ Inter_H_window_5_8 (6x9 windows)
	//							 Inter_H_window_x_0,Inter_H_window_x_1,Inter_H_window_x_6,Inter_H_window_x_7,Inter_H_window_x_8
	//							 are only used for pos_j/pos_i/pos_k/pos_f/pos_q
	//Vertical   sliding window:Inter_V_window_0 ~ Inter_V_window_8
	//Chroma     sliding window:Inter_C_window_0 ~ Inter_C_window_3
	
	//By careful study,we find that pos_b calculate cycle4 needs the same window as pos_a calculate cycl5.
	//Similar cases happens with pos_b and pos_a/pos_c,pos_h and pos_d/pos_n, pos_j and pos_f/pos_q/pos_i/pos_k......
	
	//Inter_H_window_counter0:for Inter_H_window_x_0/1/6/7/8 sliding window control
	reg [2:0] Inter_H_window_counter0;
	always @ (pos_FracL or blk4x4_inter_calculate_counter)
		if  ((pos_FracL == `pos_j && blk4x4_inter_calculate_counter == 4'd5) 						||
			((pos_FracL == `pos_f || pos_FracL == `pos_q) && blk4x4_inter_calculate_counter == 4'd5)	||
			((pos_FracL == `pos_i || pos_FracL == `pos_k) && blk4x4_inter_calculate_counter == 4'd8))
			Inter_H_window_counter0 <= 3'd4;
		else if ((pos_FracL == `pos_j && blk4x4_inter_calculate_counter == 4'd4) 						||
				((pos_FracL == `pos_f || pos_FracL == `pos_q) && blk4x4_inter_calculate_counter == 4'd4)	||
				((pos_FracL == `pos_i || pos_FracL == `pos_k) && blk4x4_inter_calculate_counter == 4'd6))
			Inter_H_window_counter0 <= 3'd3;
		else if ((pos_FracL == `pos_j && blk4x4_inter_calculate_counter == 4'd3) 						||
				((pos_FracL == `pos_f || pos_FracL == `pos_q) && blk4x4_inter_calculate_counter == 4'd3)	||
				((pos_FracL == `pos_i || pos_FracL == `pos_k) && blk4x4_inter_calculate_counter == 4'd4))
			Inter_H_window_counter0 <= 3'd2;
		else if ((pos_FracL == `pos_j && blk4x4_inter_calculate_counter == 4'd2) 						||
				((pos_FracL == `pos_f || pos_FracL == `pos_q) && blk4x4_inter_calculate_counter == 4'd2)	||
				((pos_FracL == `pos_i || pos_FracL == `pos_k) && blk4x4_inter_calculate_counter == 4'd2))
			Inter_H_window_counter0 <= 3'd1;
		else
			Inter_H_window_counter0 <= 0;
			
	
	//Inter_H_window_x_0,Inter_H_window_x_1
	//Inter_H_window_x_6,Inter_H_window_x_7,Inter_H_window_x_8
	//Active only for pos j,i/k/f/q
	always @ (Is_blk4x4_0 or Is_blk4x4_1 or Is_blk4x4_2 or Is_blk4x4_3 or Inter_H_window_counter0
		
		or Inter_ref_00_00 or Inter_ref_01_00 or Inter_ref_02_00 or Inter_ref_03_00
		or Inter_ref_04_00 or Inter_ref_05_00 or Inter_ref_06_00 or Inter_ref_07_00
		or Inter_ref_08_00 or Inter_ref_09_00 or Inter_ref_10_00 or Inter_ref_11_00 or Inter_ref_12_00
		
		or Inter_ref_00_01 or Inter_ref_01_01 or Inter_ref_02_01 or Inter_ref_03_01
		or Inter_ref_04_01 or Inter_ref_05_01 or Inter_ref_06_01 or Inter_ref_07_01
		or Inter_ref_08_01 or Inter_ref_09_01 or Inter_ref_10_01 or Inter_ref_11_01 or Inter_ref_12_01
		
		or Inter_ref_00_06 or Inter_ref_01_06 or Inter_ref_02_06 or Inter_ref_03_06
		or Inter_ref_04_06 or Inter_ref_05_06 or Inter_ref_06_06 or Inter_ref_07_06
		or Inter_ref_08_06 or Inter_ref_09_06 or Inter_ref_10_06 or Inter_ref_11_06 or Inter_ref_12_06
		
		or Inter_ref_00_07 or Inter_ref_01_07 or Inter_ref_02_07 or Inter_ref_03_07
		or Inter_ref_04_07 or Inter_ref_05_07 or Inter_ref_06_07 or Inter_ref_07_07
		or Inter_ref_08_07 or Inter_ref_09_07 or Inter_ref_10_07 or Inter_ref_11_07 or Inter_ref_12_07
		
		or Inter_ref_00_08 or Inter_ref_01_08 or Inter_ref_02_08 or Inter_ref_03_08
		or Inter_ref_04_08 or Inter_ref_05_08 or Inter_ref_06_08 or Inter_ref_07_08
		or Inter_ref_08_08 or Inter_ref_09_08 or Inter_ref_10_08 or Inter_ref_11_08 or Inter_ref_12_08 
		
		or Inter_ref_00_04 or Inter_ref_01_04 or Inter_ref_02_04 or Inter_ref_03_04
		or Inter_ref_04_04 or Inter_ref_05_04 or Inter_ref_06_04 or Inter_ref_07_04
		or Inter_ref_08_04 or Inter_ref_09_04 or Inter_ref_10_04 or Inter_ref_11_04 or Inter_ref_12_04
		
		or Inter_ref_00_05 or Inter_ref_01_05 or Inter_ref_02_05 or Inter_ref_03_05
		or Inter_ref_04_05 or Inter_ref_05_05 or Inter_ref_06_05 or Inter_ref_07_05
		or Inter_ref_08_05 or Inter_ref_09_05 or Inter_ref_10_05 or Inter_ref_11_05 or Inter_ref_12_05
		
		or Inter_ref_00_10 or Inter_ref_01_10 or Inter_ref_02_10 or Inter_ref_03_10
		or Inter_ref_04_10 or Inter_ref_05_10 or Inter_ref_06_10 or Inter_ref_07_10
		or Inter_ref_08_10 or Inter_ref_09_10 or Inter_ref_10_10 or Inter_ref_11_10 or Inter_ref_12_10 
		
		or Inter_ref_00_11 or Inter_ref_01_11 or Inter_ref_02_11 or Inter_ref_03_11
		or Inter_ref_04_11 or Inter_ref_05_11 or Inter_ref_06_11 or Inter_ref_07_11
		or Inter_ref_08_11 or Inter_ref_09_11 or Inter_ref_10_11 or Inter_ref_11_11 or Inter_ref_12_11
		
		or Inter_ref_00_12 or Inter_ref_01_12 or Inter_ref_02_12 or Inter_ref_03_12
		or Inter_ref_04_12 or Inter_ref_05_12 or Inter_ref_06_12 or Inter_ref_07_12
		or Inter_ref_08_12 or Inter_ref_09_12 or Inter_ref_10_12 or Inter_ref_11_12 or Inter_ref_12_12 
		)
		case ({Is_blk4x4_0,Is_blk4x4_1,Is_blk4x4_2,Is_blk4x4_3}) 
			4'b1000: //Left top blk4x4
			case (Inter_H_window_counter0)
				3'd4:
				begin 	
					Inter_H_window_0_0 <= Inter_ref_00_00;Inter_H_window_1_0 <= Inter_ref_01_00;
					Inter_H_window_2_0 <= Inter_ref_02_00;Inter_H_window_3_0 <= Inter_ref_03_00;
					Inter_H_window_4_0 <= Inter_ref_04_00;Inter_H_window_5_0 <= Inter_ref_05_00;
						
					Inter_H_window_0_1 <= Inter_ref_00_01;Inter_H_window_1_1 <= Inter_ref_01_01; 
					Inter_H_window_2_1 <= Inter_ref_02_01;Inter_H_window_3_1 <= Inter_ref_03_01;
					Inter_H_window_4_1 <= Inter_ref_04_01;Inter_H_window_5_1 <= Inter_ref_05_01;
					
					Inter_H_window_0_6 <= Inter_ref_00_06;Inter_H_window_1_6 <= Inter_ref_01_06; 
					Inter_H_window_2_6 <= Inter_ref_02_06;Inter_H_window_3_6 <= Inter_ref_03_06;
					Inter_H_window_4_6 <= Inter_ref_04_06;Inter_H_window_5_6 <= Inter_ref_05_06;
							
					Inter_H_window_0_7 <= Inter_ref_00_07;Inter_H_window_1_7 <= Inter_ref_01_07; 
					Inter_H_window_2_7 <= Inter_ref_02_07;Inter_H_window_3_7 <= Inter_ref_03_07;
					Inter_H_window_4_7 <= Inter_ref_04_07;Inter_H_window_5_7 <= Inter_ref_05_07;
							
					Inter_H_window_0_8 <= Inter_ref_00_08;Inter_H_window_1_8 <= Inter_ref_01_08; 
					Inter_H_window_2_8 <= Inter_ref_02_08;Inter_H_window_3_8 <= Inter_ref_03_08;
					Inter_H_window_4_8 <= Inter_ref_04_08;Inter_H_window_5_8 <= Inter_ref_05_08;
				end
				3'd3:
				begin 	
					Inter_H_window_0_0 <= Inter_ref_01_00;Inter_H_window_1_0 <= Inter_ref_02_00;
					Inter_H_window_2_0 <= Inter_ref_03_00;Inter_H_window_3_0 <= Inter_ref_04_00;
					Inter_H_window_4_0 <= Inter_ref_05_00;Inter_H_window_5_0 <= Inter_ref_06_00;
							
					Inter_H_window_0_1 <= Inter_ref_01_01;Inter_H_window_1_1 <= Inter_ref_02_01; 
					Inter_H_window_2_1 <= Inter_ref_03_01;Inter_H_window_3_1 <= Inter_ref_04_01;
					Inter_H_window_4_1 <= Inter_ref_05_01;Inter_H_window_5_1 <= Inter_ref_06_01;
						
					Inter_H_window_0_6 <= Inter_ref_01_06;Inter_H_window_1_6 <= Inter_ref_02_06; 
					Inter_H_window_2_6 <= Inter_ref_03_06;Inter_H_window_3_6 <= Inter_ref_04_06;
					Inter_H_window_4_6 <= Inter_ref_05_06;Inter_H_window_5_6 <= Inter_ref_06_06;
							
					Inter_H_window_0_7 <= Inter_ref_01_07;Inter_H_window_1_7 <= Inter_ref_02_07; 
					Inter_H_window_2_7 <= Inter_ref_03_07;Inter_H_window_3_7 <= Inter_ref_04_07;
					Inter_H_window_4_7 <= Inter_ref_05_07;Inter_H_window_5_7 <= Inter_ref_06_07;
							
					Inter_H_window_0_8 <= Inter_ref_01_08;Inter_H_window_1_8 <= Inter_ref_02_08; 
					Inter_H_window_2_8 <= Inter_ref_03_08;Inter_H_window_3_8 <= Inter_ref_04_08;
					Inter_H_window_4_8 <= Inter_ref_05_08;Inter_H_window_5_8 <= Inter_ref_06_08;
				end
				3'd2:
				begin 	
					Inter_H_window_0_0 <= Inter_ref_02_00;Inter_H_window_1_0 <= Inter_ref_03_00;
					Inter_H_window_2_0 <= Inter_ref_04_00;Inter_H_window_3_0 <= Inter_ref_05_00;
					Inter_H_window_4_0 <= Inter_ref_06_00;Inter_H_window_5_0 <= Inter_ref_07_00;
						
					Inter_H_window_0_1 <= Inter_ref_02_01;Inter_H_window_1_1 <= Inter_ref_03_01; 
					Inter_H_window_2_1 <= Inter_ref_04_01;Inter_H_window_3_1 <= Inter_ref_05_01;
					Inter_H_window_4_1 <= Inter_ref_06_01;Inter_H_window_5_1 <= Inter_ref_07_01;
						
					Inter_H_window_0_6 <= Inter_ref_02_06;Inter_H_window_1_6 <= Inter_ref_03_06; 
					Inter_H_window_2_6 <= Inter_ref_04_06;Inter_H_window_3_6 <= Inter_ref_05_06;
					Inter_H_window_4_6 <= Inter_ref_06_06;Inter_H_window_5_6 <= Inter_ref_07_06;
							
					Inter_H_window_0_7 <= Inter_ref_02_07;Inter_H_window_1_7 <= Inter_ref_03_07; 
					Inter_H_window_2_7 <= Inter_ref_04_07;Inter_H_window_3_7 <= Inter_ref_05_07;
					Inter_H_window_4_7 <= Inter_ref_06_07;Inter_H_window_5_7 <= Inter_ref_07_07;