numcoefftrailingones_decoding.v

a H.264/AVC Baseline Decoder

						if ((heading_one_pos == 4'd1 && 
							(BitStream_buffer_output[13:11] == 3'b000 || BitStream_buffer_output[13:11] == 3'b010 || 
							 BitStream_buffer_output[13:11] == 3'b100 || BitStream_buffer_output[13:11] == 3'b111)) ||
							(heading_one_pos == 4'd2 && BitStream_buffer_output[11:10] == 2'b10 ) ||
							(heading_one_pos == 4'd3 && BitStream_buffer_output[11:9]  == 3'b110) ||
							(heading_one_pos == 4'd4 && BitStream_buffer_output[9:8]   == 2'b10 ))
							TrailingOnes <= 2'd1;
						else if (
							(heading_one_pos == 4'd1 && (BitStream_buffer_output[13:11] == 3'b001 || BitStream_buffer_output[13:11] == 3'b011 || BitStream_buffer_output[13:11] == 3'b110))||
							(heading_one_pos == 4'd2 &&  BitStream_buffer_output[11:10] == 2'b01) ||
							(heading_one_pos == 4'd3 && (BitStream_buffer_output[11:9]  == 3'b010 || BitStream_buffer_output[11:9]  == 3'b101))||
							(heading_one_pos == 4'd4 &&  BitStream_buffer_output[9:8]   == 2'b01))
							TrailingOnes <= 2'd2;
						else if (
							(heading_one_pos == 4'd1 && BitStream_buffer_output[13:11] == 3'b101) ||
							(heading_one_pos == 4'd2 && BitStream_buffer_output[12:10] == 3'b100) ||
							(heading_one_pos == 4'd3 && BitStream_buffer_output[11:9]  == 3'b100) ||
							(heading_one_pos == 4'd4 && BitStream_buffer_output[9:8]   == 2'b00))
							TrailingOnes <= 2'd3;
						else
							TrailingOnes <= 2'd0;
					end
				else
					begin
						if ((heading_one_pos == 4'd5 && BitStream_buffer_output[8:7] == 2'b10) ||
                (heading_one_pos == 4'd6 && (BitStream_buffer_output[8:7] == 2'b11 || BitStream_buffer_output[7:6] == 2'b00)) ||
                (heading_one_pos == 4'd7 && BitStream_buffer_output[7:6] == 2'b00))
							TrailingOnes <= 2'd1;
						else if (
							(heading_one_pos == 4'd5 && BitStream_buffer_output[8:7] == 2'b01)  ||
							(heading_one_pos == 4'd6 && BitStream_buffer_output[8:6] == 3'b011) ||
							(heading_one_pos == 4'd7 && BitStream_buffer_output[7:6] == 2'b11)  ||
							(heading_one_pos == 4'd8 && BitStream_buffer_output[6]))
							TrailingOnes <= 2'd2;
						else if (
							(heading_one_pos == 4'd5 &&  BitStream_buffer_output[9:7] == 3'b100)  ||
							(heading_one_pos == 4'd6 &&  BitStream_buffer_output[8:6] == 3'b010) ||
							(heading_one_pos == 4'd7 &&  BitStream_buffer_output[7:6] == 2'b10)  ||
							(heading_one_pos == 4'd8 && !BitStream_buffer_output[6]))
							TrailingOnes <= 2'd3;
						else
							TrailingOnes <= 2'd0;
					end
			end
		else if (nC_GE8)
			begin
				if (BitStream_buffer_output[15:10] == 6'b0 || heading_one_pos == 4'd4)
					TrailingOnes <= 2'd0;
				else if (heading_one_pos == 4'd5)
					TrailingOnes <= 2'd1;
				else
					TrailingOnes <= BitStream_buffer_output[11:10];
			end
		else
			TrailingOnes <= TrailingOnes_reg; 
			
	//TotalCoeff
	always @ (posedge clk)
		if (reset_n == 0)
			TotalCoeff_reg <= 0;
		else if (cavlc_decoder_state == `NumCoeffTrailingOnes_LUT)
			TotalCoeff_reg <= TotalCoeff;
			
	always @ (nC_0to2 or nC_2to4 or nC_4to8 or nC_n1 or nC_GE8 
	or nC_0to2_t0 or nC_0to2_t1 or nC_0to2_t2 or nC_0to2_t3  
	or nC_2to4_t0 or nC_2to4_t1 or nC_2to4_t2 or nC_2to4_t3  
	or nC_4to8_t0 or nC_4to8_t1 or nC_n1_t0  
	or TotalCoeff_reg or heading_one_pos or BitStream_buffer_output)
		if (nC_0to2)
			begin
				if (nC_0to2_t0) 
					TotalCoeff <= {3'b0,heading_one_pos[1:0]};
				else if (nC_0to2_t1)
					begin
						if (heading_one_pos == 4'd3)
							case (BitStream_buffer_output[11:10])
								2'b00  :TotalCoeff <= 5'd2;
								2'b01  :TotalCoeff <= 5'd1;
								default:TotalCoeff <= 5'd3;
							endcase
						else
							case (BitStream_buffer_output[10:9])
								2'b00  :TotalCoeff <= 5'd5;
								2'b01  :TotalCoeff <= 5'd3;
								default:TotalCoeff <= 5'd4;
							endcase
					end
				else if (nC_0to2_t2)
					begin
						if (heading_one_pos == 4'd5)
							case (BitStream_buffer_output[9:8])
								2'b00:TotalCoeff <= 5'd6;
								2'b01:TotalCoeff <= 5'd4;
								2'b10:TotalCoeff <= 5'd3;
								2'b11:TotalCoeff <= 5'd2;
							endcase
						else if (heading_one_pos == 4'd6)
							case (BitStream_buffer_output[8:7])
								2'b00:TotalCoeff <= 5'd7;
								2'b01:TotalCoeff <= 5'd5;
								2'b10:TotalCoeff <= 5'd4;
								2'b11:TotalCoeff <= 5'd3;
							endcase
						else if (heading_one_pos == 4'd7)
							case (BitStream_buffer_output[7:6])
								2'b00:TotalCoeff <= 5'd8;
								2'b01:TotalCoeff <= 5'd6;
								2'b10:TotalCoeff <= 5'd5;
								2'b11:TotalCoeff <= 5'd4;
							endcase
						else 
							case (BitStream_buffer_output[6:5])
								2'b00:TotalCoeff <= 5'd9;
								2'b01:TotalCoeff <= 5'd7;
								2'b10:TotalCoeff <= 5'd6;
								2'b11:TotalCoeff <= 5'd5;
							endcase
					end
				else if (nC_0to2_t3)
					begin 
						if (heading_one_pos == 4'd9)
							case (BitStream_buffer_output[5:3])
								3'b001		   :TotalCoeff <= 5'd9;
								3'b011,3'b110:TotalCoeff <= 5'd7;
								3'b100		   :TotalCoeff <= 5'd10;
								3'b111		   :TotalCoeff <= 5'd6;
								default		   :TotalCoeff <= 5'd8;
							endcase
						else
							case (BitStream_buffer_output[4:2])
								3'b000		   :TotalCoeff <= 5'd12; 
								3'b001,3'b100:TotalCoeff <= 5'd11;
								3'b110,3'b111:TotalCoeff <= 5'd9;
								default      :TotalCoeff <= 5'd10;
							endcase
					end
				else
					begin 
						if (heading_one_pos == 4'd11)
							case (BitStream_buffer_output[3:1])
								3'b000       :TotalCoeff <= 5'd14;
								3'b001,3'b100:TotalCoeff <= 5'd13;
								3'b110,3'b111:TotalCoeff <= 5'd11;
								default      :TotalCoeff <= 5'd12;
							endcase
						else if (heading_one_pos == 4'd12)
							case (BitStream_buffer_output[2:0])
								3'b000              :TotalCoeff <= 5'd16;
								3'b011,3'b101,3'b110:TotalCoeff <= 5'd14;
								3'b111              :TotalCoeff <= 5'd13;
								default             :TotalCoeff <= 5'd15;
							endcase							
						else if (heading_one_pos == 4'd13) 
							TotalCoeff <= (BitStream_buffer_output[1:0] == 2'b11)? 5'd15:5'd16;
						else
							TotalCoeff <= 5'd13;
					end
			end
		else if (nC_2to4)
			begin
				if (nC_2to4_t0)
					begin
						if (heading_one_pos == 4'd0)
							TotalCoeff <= {4'b0,~BitStream_buffer_output[14]};
						else
							case (BitStream_buffer_output[13:12])
								2'b00  :TotalCoeff <= 5'd4;
								2'b01  :TotalCoeff <= 5'd3;
								default:TotalCoeff <= 5'd2;
							endcase
					end
				else if (nC_2to4_t1)
					begin
						if (heading_one_pos == 4'd2)
							case (BitStream_buffer_output[12:11])
								2'b00:TotalCoeff <= (BitStream_buffer_output[10])? 5'd3:5'd6;
								2'b01:TotalCoeff <= (BitStream_buffer_output[10])? 5'd1:5'd3;
								2'b10:TotalCoeff <= 5'd5;
								2'b11:TotalCoeff <= 5'd2;
							endcase
						else
							case (BitStream_buffer_output[11:10])
								2'b00  :TotalCoeff <= 5'd7;
								2'b11  :TotalCoeff <= 5'd2;
								default:TotalCoeff <= 5'd4;
							endcase
					end	
				else if (nC_2to4_t2)
					begin
						if (heading_one_pos == 4'd4)
							case (BitStream_buffer_output[10:9])
								2'b00  :TotalCoeff <= 5'd8;
								2'b11  :TotalCoeff <= 5'd3;
								default:TotalCoeff <= 5'd5;
							endcase
						else if (heading_one_pos == 4'd5)
							case (BitStream_buffer_output[9:8])
								2'b00  :TotalCoeff <= 5'd5;
								2'b11  :TotalCoeff <= 5'd4;
								default:TotalCoeff <= 5'd6;
							endcase
						else
							case (BitStream_buffer_output[8:7])
								2'b00  :TotalCoeff <= 5'd9;
								2'b11  :TotalCoeff <= 5'd6;
								default:TotalCoeff <= 5'd7;
							endcase
					end
				else if (nC_2to4_t3)
					begin 
						if (heading_one_pos == 4'd7)
							case (BitStream_buffer_output[7:5])
								3'b000       :TotalCoeff <= 5'd11;
								3'b001,3'b010:TotalCoeff <= 5'd9;
								3'b100       :TotalCoeff <= 5'd10;
								3'b111       :TotalCoeff <= 5'd7;
								default      :TotalCoeff <= 5'd8;
							endcase
						else
							case (BitStream_buffer_output[6:4])
								3'b000,3'b001,3'b010:TotalCoeff <= 5'd11; 
								3'b100              :TotalCoeff <= 5'd12;
								3'b111              :TotalCoeff <= 5'd9;
								default             :TotalCoeff <= 5'd10;
							endcase
					end
				else
					begin 
						if (heading_one_pos == 4'd9)
							case (BitStream_buffer_output[5:3])
								3'b000              :TotalCoeff <= 5'd14;
								3'b101,3'b110,3'b111:TotalCoeff <= 5'd12;
								default             :TotalCoeff <= 5'd13;
							endcase
						else if (heading_one_pos == 4'd10)
							TotalCoeff <= (BitStream_buffer_output[4:2] == 3'b0 || BitStream_buffer_output[4:2] == 3'b001 || BitStream_buffer_output[4:2] == 3'b010)? 5'd15:5'd14;
						else if (heading_one_pos == 4'd11)
							TotalCoeff <= 5'd16;
						else 
							TotalCoeff <= 5'd15;
					end
			end
		else if (nC_n1)
			begin 
				if (nC_n1_t0)
					begin 
						if      (BitStream_buffer_output[15])	TotalCoeff <= 5'd1;
						else if (BitStream_buffer_output[14])	TotalCoeff <= 5'd0;
						else                                  TotalCoeff <= 5'd2;
					end
				else 
					begin 
						if (heading_one_pos == 4'd3)
							case (BitStream_buffer_output[11:10])
								2'b01  :TotalCoeff <= 5'd3;
								2'b11  :TotalCoeff <= 5'd1;
								default:TotalCoeff <= 5'd2;
							endcase
						else if (heading_one_pos == 4'd4)
							TotalCoeff <= (BitStream_buffer_output[10])? 5'd3:5'd4;
						else if (heading_one_pos == 4'd5)
							TotalCoeff <= 5'd3;
						else
							TotalCoeff <= 5'd4;
					end
			end
		else if (nC_4to8)
			begin
				if (nC_4to8_t0)
					TotalCoeff <= {2'b0,~BitStream_buffer_output[14:12]};
				else if (nC_4to8_t1)
					begin
						if (heading_one_pos == 4'd1)
							case (BitStream_buffer_output[13:11])
								3'b000,3'b001:TotalCoeff <= 5'd5;
								3'b010,3'b011:TotalCoeff <= 5'd4;
								3'b101       :TotalCoeff <= 5'd8;
								3'b111       :TotalCoeff <= 5'd2;
								default      :TotalCoeff <= 5'd3;
							endcase
						else if (heading_one_pos == 4'd2)
							case (BitStream_buffer_output[12:10])
								3'b000       :TotalCoeff <= 5'd3;
								3'b001,3'b010:TotalCoeff <= 5'd7;
								3'b011       :TotalCoeff <= 5'd2;
								3'b100       :TotalCoeff <= 5'd9;
								3'b111       :TotalCoeff <= 5'd1;
								default      :TotalCoeff <= 5'd6;
							endcase
						else if (heading_one_pos == 4'd3)
							case (BitStream_buffer_output[11:9])
								3'b000 :TotalCoeff <= 5'd7;
								3'b001 :TotalCoeff <= 5'd6;
								3'b010 :TotalCoeff <= 5'd9;
								3'b011 :TotalCoeff <= 5'd5;
								3'b100 :TotalCoeff <= 5'd10;
								3'b111 :TotalCoeff <= 5'd4;
								default:TotalCoeff <= 5'd8;
							endcase
						else 
							case (BitStream_buffer_output[10:8])
								3'b000       :TotalCoeff <= 5'd12;
								3'b001,3'b100:TotalCoeff <= 5'd11;
								3'b010,3'b101:TotalCoeff <= 5'd10;
								3'b111       :TotalCoeff <= 5'd8;
								default      :TotalCoeff <= 5'd9;
							endcase
					end
				else
					begin
						if (heading_one_pos == 4'd5)
							case (BitStream_buffer_output[9:7])
								3'b001,3'b100	:TotalCoeff <= 5'd13;
								3'b011,3'b110	:TotalCoeff <= 5'd11;
								3'b111        :TotalCoeff <= 5'd10;
								default       :TotalCoeff <= 5'd12;
							endcase
						else if (heading_one_pos == 4'd6)
							case (BitStream_buffer_output[8:6])
								3'b000              :TotalCoeff <= 5'd15;
								3'b101,3'b110,3'b111:TotalCoeff <= 5'd13;
								default             :TotalCoeff <= 5'd14;
							endcase
						else if (heading_one_pos == 4'd7)
							TotalCoeff <= (BitStream_buffer_output[7:6] == 2'b00)? 5'd16:5'd15;
						else 
							TotalCoeff <= 5'd16; 
					end
			end
		else if (nC_GE8)
			begin
				if (heading_one_pos == 4'd4)
					TotalCoeff <= 5'd0;
				else
					TotalCoeff <= BitStream_buffer_output[15:12] + 1;
			end
		else
			TotalCoeff <= TotalCoeff_reg;			
endmodule