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//**********************************************************************
// Entropy Decoder implementation
//----------------------------------------------------------------------
//
//

package mkEntropyDec;

import H264Types::*;
import ExpGolomb::*;
import CAVLC::*;
import ICalc_nC::*;
import mkCalc_nC::*;
import IEntropyDec::*;
import FIFO::*;

import Connectable::*;
import GetPut::*;
import ClientServer::*;


//-----------------------------------------------------------
// Local Datatypes
//-----------------------------------------------------------

typedef union tagged                
{
 void     Start;            //special state that initializes the process.
 void     NewUnit;          //special state that checks the NAL unit type.
                 
 Bit#(5)  CodedSlice;       //decodes a type of NAL unit
 void     SEI;              //decodes a type of NAL unit
 Bit#(5)  SPS;              //decodes a type of NAL unit
 Bit#(5)  PPS;              //decodes a type of NAL unit
 void     AUD;              //decodes a type of NAL unit
 void     EndSequence;      //decodes a type of NAL unit
 void     EndStream;        //decodes a type of NAL unit
 void     Filler;           //decodes a type of NAL unit

 Bit#(5)  SliceData;        //decodes slice data (part of a CodedSlice NAL unit)
 Bit#(5)  MacroblockLayer;  //decodes macroblock layer (part of a CodedSlice NAL unit)
 Bit#(5)  MbPrediction;     //decodes macroblock prediction (part of a CodedSlice NAL unit)
 Bit#(5)  SubMbPrediction;  //decodes sub-macroblock prediction (part of a CodedSlice NAL unit)
 Bit#(5)  ResidualBlock;    //decodes residual block (part of a CodedSlice NAL unit)
}
State deriving(Eq,Bits);


      
//-----------------------------------------------------------
// Helper functions   
function MbType mbtype_convert( Bit#(5) in_mb_type, Bit#(4) in_slice_type );//converts mb_type syntax element to MbType type
   Bit#(5) tempmb = in_mb_type;
   if(in_slice_type == 2 || in_slice_type == 7)//I slice
      tempmb = in_mb_type+5;
   case ( tempmb )
      0: return P_L0_16x16;
      1: return P_L0_L0_16x8;
      2: return P_L0_L0_8x16;
      3: return P_8x8;
      4: return P_8x8ref0;
      5: return I_NxN;
      30: return I_PCM;
      default:
      begin
         Bit#(5) tempmb16x16 = tempmb-6;
         Bit#(2) tempv1 = tempmb16x16[1:0];
         Bit#(2) tempv2;
         Bit#(1) tempv3;
         if(tempmb16x16 < 12)
            begin
               tempv3 = 0;
               tempv2 = tempmb16x16[3:2];
            end
         else
            begin
               tempv3 = 1;
               tempv2 = tempmb16x16[3:2]+1;
            end
         return I_16x16{intra16x16PredMode:tempv1, codedBlockPatternChroma:tempv2, codedBlockPatternLuma:tempv3};
      end
   endcase
endfunction



//-----------------------------------------------------------
// Entropy Decoder Module
//-----------------------------------------------------------


(* synthesize *)
module mkEntropyDec( IEntropyDec );
   
   FIFO#(NalUnwrapOT)       infifo      <- mkSizedFIFO(entropyDec_infifo_size);
   FIFO#(EntropyDecOT)      outfifo     <- mkFIFO;
   FIFO#(EntropyDecOT_InverseTrans) outfifo_ITB <- mkFIFO;
   Reg#(State)              state       <- mkReg(Start);   
   Reg#(Bit#(2))            nalrefidc   <- mkReg(0);
   Reg#(Bit#(5))            nalunittype <- mkReg(0);
   Reg#(Buffer)             buffer      <- mkReg(0);
   Reg#(Bufcount)           bufcount    <- mkReg(0);

   //saved syntax elements
   Reg#(Bit#(5))              spsseq_parameter_set_id                    <- mkReg(0);
   Reg#(Bit#(5))              spslog2_max_frame_num                      <- mkReg(0);
   Reg#(Bit#(5))              spslog2_max_pic_order_cnt_lsb              <- mkReg(0);
   Reg#(Bit#(2))              spspic_order_cnt_type                      <- mkReg(0);
   Reg#(Bit#(1))              spsdelta_pic_order_always_zero_flag        <- mkReg(0);
   Reg#(Bit#(8))              spsnum_ref_frames_in_pic_order_cnt_cycle   <- mkReg(0);
   Reg#(Bit#(8))              ppspic_parameter_set_id                    <- mkReg(0);
   Reg#(Bit#(1))              ppspic_order_present_flag                  <- mkReg(0);
   Reg#(Bit#(1))              ppsdeblocking_filter_control_present_flag  <- mkReg(0);
   Reg#(Bit#(4))              shslice_type                               <- mkReg(0);
   Reg#(Bit#(3))              shdmemory_management_control_operation     <- mkReg(0);
   Reg#(MbType)               sdmmbtype                                  <- mkReg(I_NxN);
   Reg#(Bit#(4))              sdmcodedBlockPatternLuma                   <- mkReg(0);
   Reg#(Bit#(2))              sdmcodedBlockPatternChroma                 <- mkReg(0);
   Reg#(Bit#(5))              sdmrTotalCoeff                             <- mkReg(0);
   Reg#(Bit#(2))              sdmrTrailingOnes                           <- mkReg(0);
   
   //derived decoding variables for slice data
   Reg#(Bit#(16))             tempreg                                    <- mkReg(0);
   Reg#(Bit#(5))              num_ref_idx_l0_active_minus1               <- mkReg(0);
   Reg#(Bit#(PicAreaSz))      currMbAddr                                 <- mkReg(0);
   Reg#(Bit#(3))              temp3bit0                                  <- mkReg(0);
   Reg#(Bit#(3))              temp3bit1                                  <- mkReg(0);
   Reg#(Bit#(3))              temp3bit2                                  <- mkReg(0);
   Reg#(Bit#(3))              temp3bit3                                  <- mkReg(0);
   Reg#(Bit#(5))              temp5bit                                   <- mkReg(0);
   Reg#(Bit#(5))              temp5bit2                                  <- mkReg(0);
   Reg#(Bit#(5))              maxNumCoeff                                <- mkReg(0);
   FIFO#(Bit#(13))            cavlcFIFO                                  <- mkSizedFIFO(16);
   Calc_nC                    calcnc                                     <- mkCalc_nC();
   Reg#(Bit#(1))              residualChroma                             <- mkReg(0);
   Reg#(Bit#(5))              totalCoeff                                 <- mkReg(0);
   Reg#(Bit#(4))              zerosLeft                                  <- mkReg(0);

   //exp-golomb 32-bit version states
   Reg#(Bufcount)             egnumbits                                  <- mkReg(0);

   //extra-buffering states
   Reg#(Bit#(32))             extrabuffer                                <- mkReg(0);
   Reg#(Bit#(3))              extrabufcount                              <- mkReg(0);
   Reg#(Bit#(1))              extraendnalflag                            <- mkReg(0);
   Reg#(Bit#(1))              endnalflag                                 <- mkReg(0);
   

   //-----------------------------------------------------------
   // Rules

   rule startup (state matches Start);
      case (infifo.first()) matches
         tagged NewUnit :
            begin
               infifo.deq();
               state <= NewUnit;
               buffer <= 0;
               bufcount <= 0;
               extrabuffer <= 0;
               extrabufcount <= 0;
               extraendnalflag <= 0;
               endnalflag <= 0;
            end
         tagged RbspByte .rdata :
            begin
               infifo.deq();
            end
         tagged EndOfFile :
            begin
               infifo.deq();
               outfifo.enq(EndOfFile);
               $display( "INFO EntropyDec: EndOfFile reached" );
            end
      endcase
   endrule

   
   rule newunit (state matches NewUnit);
      case (infifo.first()) matches
         tagged NewUnit : state <= Start;
         tagged RbspByte .rdata :
            begin
               infifo.deq();
               nalrefidc <= rdata[6:5];
               nalunittype <= rdata[4:0];
               case (rdata[4:0])
                  1 : state <= tagged CodedSlice 0;
                  5 : state <= tagged CodedSlice 0;
                  6 : state <= SEI;
                  7 : state <= tagged SPS 0;
                  8 : state <= tagged PPS 0;
                  9 : state <= AUD;
                  10: state <= EndSequence;
                  11: state <= EndStream;
                  12: state <= Filler;
                  default:
                  begin
                     $display( "ERROR EntropyDec: NAL Unit Type = %d", rdata[4:0] );
                     state <= Start;
                  end
               endcase
               $display("ccl2newunit");
               $display("ccl2rbspbyte %h", rdata);
               outfifo.enq(tagged NewUnit rdata);
               outfifo_ITB.enq(tagged NewUnit rdata);
            end
         tagged EndOfFile : state <= Start;
      endcase
   endrule


   rule fillextrabuffer (state != Start
                         && state != NewUnit
                         && extrabufcount < 4
                         && extraendnalflag == 0);
      if(infifo.first() matches tagged RbspByte .dbyte)
         begin
            case ( extrabufcount )
               0: extrabuffer <= {dbyte, extrabuffer[23:0]};
               1: extrabuffer <= {extrabuffer[31:24],dbyte,extrabuffer[15:0]};
               2: extrabuffer <= {extrabuffer[31:16],dbyte,extrabuffer[7:0]};
               3: extrabuffer <= {extrabuffer[31:8],dbyte};
               default: $display( "ERROR EntropyDec: fillextrabuffer default case_" );
            endcase
            extrabufcount <= extrabufcount + 1;
            infifo.deq();
            //$display( "TRACE EntropyDec: fillextrabuffer RbspByte %h %h %h", dbyte, extrabufcount, extrabuffer);
         end
      else
         begin
            if(extrabufcount != 0)
               extraendnalflag <= 1;
            //$display( "TRACE EntropyDec: fillextrabuffer else %h", extrabufcount);
         end
   endrule
   

   rule fillbuffer (state != Start
                    && state != NewUnit
                    && bufcount<=truncate(buffersize-32)
                    && (extrabufcount == 4 || extraendnalflag == 1)
                    && endnalflag == 0);//predicate not sure
      Buffer temp = zeroExtend(extrabuffer);
      Bufcount temp2 = truncate(buffersize)-bufcount-32;
      buffer <= (buffer | (temp << zeroExtend(temp2)));
      case ( extrabufcount )
         4: bufcount <= bufcount+32;
         3: bufcount <= bufcount+24;
         2: bufcount <= bufcount+16;
         1: bufcount <= bufcount+8;
         default: $display( "ERROR EntropyDec: fillbuffer default case" );
      endcase
      extrabuffer <= 0;
      extrabufcount <= 0;
      if(infifo.first()==NewUnit || infifo.first()==EndOfFile)
         endnalflag <= 1;
      //$display( "TRACE EntropyDec: fillbuffer RbspByte %h %h %h %h %h %h %h %h", extrabufcount, bufcount, extrabuffer, temp, temp2, (temp << zeroExtend(temp2)), buffer, (buffer | (temp << zeroExtend(temp2))));
   endrule


   rule parser (state != Start
                &&& state != NewUnit
                &&& (bufcount > truncate(buffersize-32) || endnalflag == 1));//predicate not sure
      //$display( "TRACE EntropyDec: fillbuffer RbspByte %h %h", bufcount, buffer );
      
      Bufcount numbitsused = 0;
      State nextstate = Start;
      Int#(16) tempint = 0;
      Int#(32) tempint32 = 0;
      
      case ( state ) matches
         tagged CodedSlice .step : 
            begin
               case ( step )
                  0:
                  begin
                     $display( "ccl2SHfirst_mb_in_slice %0d", expgolomb_unsigned(buffer) );
                     outfifo.enq(tagged SHfirst_mb_in_slice truncate(expgolomb_unsigned(buffer)));
                     currMbAddr <= truncate(expgolomb_unsigned(buffer));
                     calcnc.initialize(truncate(expgolomb_unsigned(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged CodedSlice 1;
                  end
                  1:
                  begin
                     $display( "ccl2SHslice_type %0d", expgolomb_unsigned(buffer) );
                     outfifo.enq(tagged SHslice_type truncate(expgolomb_unsigned(buffer)));
                     shslice_type <= truncate(expgolomb_unsigned(buffer));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged CodedSlice 2;
                  end
                  2:
                  begin
                     $display( "ccl2SHpic_parameter_set_id %0d", expgolomb_unsigned(buffer) );
                     outfifo.enq(tagged SHpic_parameter_set_id truncate(expgolomb_unsigned(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged CodedSlice 3;
                     if(ppspic_parameter_set_id != truncate(expgolomb_unsigned(buffer))) $display( "ERROR EntropyDec: pic_parameter_set_id don't match" );
                  end
                  3:
                  begin
                     Bit#(16) tttt = buffer[buffersize-1:buffersize-16];
                     tttt = tttt >> 16 - zeroExtend(spslog2_max_frame_num);
                     $display( "ccl2SHframe_num %0d", tttt );
                     outfifo.enq(tagged SHframe_num tttt);
                     numbitsused = zeroExtend(spslog2_max_frame_num);
                     nextstate = tagged CodedSlice 4;
                  end
                  4:
                  begin
                     if(nalunittype == 5)
                        begin
                           $display( "ccl2SHidr_pic_id %0d", expgolomb_unsigned(buffer) );
                           outfifo.enq(tagged SHidr_pic_id truncate(expgolomb_unsigned(buffer)));
                           numbitsused = expgolomb_numbits(buffer);
                        end
                     nextstate = tagged CodedSlice 5;
                  end
                  5:
                  begin
                     if(spspic_order_cnt_type == 0)
                        begin
                           Bit#(16) tttt = buffer[buffersize-1:buffersize-16];
                           tttt = tttt >> 16 - zeroExtend(spslog2_max_pic_order_cnt_lsb);
                           $display( "ccl2SHpic_order_cnt_lsb %0d", tttt );
                           outfifo.enq(tagged SHpic_order_cnt_lsb tttt);
                           numbitsused = zeroExtend(spslog2_max_pic_order_cnt_lsb);
                           nextstate = tagged CodedSlice 6;
                        end
                     else
                        nextstate = tagged CodedSlice 7;
                  end
                  6:
                  begin
                     if(ppspic_order_present_flag == 1)
                        begin
                           if(egnumbits == 0)
                              begin
                                 Bufcount tempbufcount = expgolomb_numbits32(buffer);
                                 egnumbits <= tempbufcount;
                                 numbitsused = tempbufcount-1;
                                 nextstate = tagged CodedSlice 6;
                              end
                           else
                              begin
                                 tempint32 = unpack(expgolomb_signed32(buffer,egnumbits));
                                 $display( "ccl2SHdelta_pic_order_cnt_bottom %0d", tempint32 );
                                 outfifo.enq(tagged SHdelta_pic_order_cnt_bottom truncate(expgolomb_signed32(buffer,egnumbits)));
                                 egnumbits <= 0;
                                 numbitsused = egnumbits;
                                 nextstate = tagged CodedSlice 7;
                              end
                        end
                     else
                        nextstate = tagged CodedSlice 7;
                  end
                  7:
                  begin
                     if(spspic_order_cnt_type == 1 && spsdelta_pic_order_always_zero_flag == 0)
                        begin
                           if(egnumbits == 0)
                              begin
                                 Bufcount tempbufcount = expgolomb_numbits32(buffer);
                                 egnumbits <= tempbufcount;
                                 numbitsused = tempbufcount-1;
                                 nextstate = tagged CodedSlice 7;
                              end
                           else
                              begin
                                 tempint32 = unpack(expgolomb_signed32(buffer,egnumbits));
                                 $display( "ccl2SHdelta_pic_order_cnt0 %0d", tempint32 );
                                 outfifo.enq(tagged SHdelta_pic_order_cnt0 truncate(expgolomb_signed32(buffer,egnumbits)));
                                 egnumbits <= 0;
                                 numbitsused = egnumbits;
                                 nextstate = tagged CodedSlice 8;
                              end
                        end
                     else
                        nextstate = tagged CodedSlice 9;
                  end
                  8:
                  begin
                     if(ppspic_order_present_flag == 1)
                        begin
                           if(egnumbits == 0)
                              begin
                                 Bufcount tempbufcount = expgolomb_numbits32(buffer);
                                 egnumbits <= tempbufcount;
                                 numbitsused = tempbufcount-1;
                                 nextstate = tagged CodedSlice 8;
                              end
                           else
                              begin
                                 tempint32 = unpack(expgolomb_signed32(buffer,egnumbits));
                                 $display( "ccl2SHdelta_pic_order_cnt1 %0d", tempint32 );
                                 outfifo.enq(tagged SHdelta_pic_order_cnt1 truncate(expgolomb_signed32(buffer,egnumbits)));
                                 egnumbits <= 0;
                                 numbitsused = egnumbits;
                                 nextstate = tagged CodedSlice 9;
                              end
                        end
                     else
                        nextstate = tagged CodedSlice 9;
                  end
                  9:
                  begin
                     if(shslice_type == 0 || shslice_type == 5)
                        begin
                           $display( "ccl2SHnum_ref_idx_active_override_flag %0d", buffer[buffersize-1] );
                           outfifo.enq(tagged SHnum_ref_idx_active_override_flag buffer[buffersize-1]);
                           numbitsused = 1;
                           if(buffer[buffersize-1] == 1)
                              nextstate = tagged CodedSlice 10;
                           else
                              nextstate = tagged CodedSlice 11;
                        end
                     else
                        nextstate = tagged CodedSlice 11;
                  end
                  10:
                  begin
                     $display( "ccl2SHnum_ref_idx_l0_active %0d", expgolomb_unsigned(buffer)+1 );
                     outfifo.enq(tagged SHnum_ref_idx_l0_active truncate(expgolomb_unsigned(buffer)+1));
                     num_ref_idx_l0_active_minus1 <= truncate(expgolomb_unsigned(buffer));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged CodedSlice 11;
                  end
                  11:
                  begin
                     if(shslice_type != 2 && shslice_type != 7)
                        begin
                           $display( "ccl2SHRref_pic_list_reordering_flag_l0 %0d", buffer[buffersize-1] );
                           outfifo.enq(tagged SHRref_pic_list_reordering_flag_l0 buffer[buffersize-1]);
                           numbitsused = 1;
                           if(buffer[buffersize-1] == 1)
                              nextstate = tagged CodedSlice 12;
                           else
                              nextstate = tagged CodedSlice 15;
                        end
                     else
                        nextstate = tagged CodedSlice 15;
                  end
                  12:
                  begin 
                     $display( "ccl2SHRreordering_of_pic_nums_idc %0d", expgolomb_unsigned(buffer) );
                     outfifo.enq(tagged SHRreordering_of_pic_nums_idc truncate(expgolomb_unsigned(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     if(expgolomb_unsigned(buffer)==0 || expgolomb_unsigned(buffer)==1)
                        nextstate = tagged CodedSlice 13;
                     else if(expgolomb_unsigned(buffer)==2)
                        nextstate = tagged CodedSlice 14;
                     else
                        nextstate = tagged CodedSlice 15;
                  end
                  13:
                  begin
                     Bit#(17) temp17 = zeroExtend(expgolomb_unsigned(buffer)) + 1;
                     $display( "ccl2SHRabs_diff_pic_num %0d", temp17 );
                     outfifo.enq(tagged SHRabs_diff_pic_num temp17);
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged CodedSlice 12;
                  end
                  14:
                  begin
                     $display( "ccl2SHRlong_term_pic_num %0d", expgolomb_unsigned(buffer) );
                     outfifo.enq(tagged SHRlong_term_pic_num truncate(expgolomb_unsigned(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged CodedSlice 12;
                  end
                  15:
                  begin
                     if(nalrefidc == 0)
                        nextstate = tagged CodedSlice 23;
                     else
                        begin
                           if(nalunittype == 5)
                              begin
                                 $display( "ccl2SHDno_output_of_prior_pics_flag %0d", buffer[buffersize-1] );
                                 outfifo.enq(tagged SHDno_output_of_prior_pics_flag buffer[buffersize-1]);
                                 numbitsused = 1;
                                 nextstate = tagged CodedSlice 16;
                              end
                           else
                              nextstate = tagged CodedSlice 17;
                        end
                  end
                  16:
                  begin
                     $display( "ccl2SHDlong_term_reference_flag %0d", buffer[buffersize-1] );
                     outfifo.enq(tagged SHDlong_term_reference_flag buffer[buffersize-1]);
                     numbitsused = 1;
                     nextstate = tagged CodedSlice 23;
                  end
                  17:
                  begin
                     $display( "ccl2SHDadaptive_ref_pic_marking_mode_flag %0d", buffer[buffersize-1] );
                     outfifo.enq(tagged SHDadaptive_ref_pic_marking_mode_flag buffer[buffersize-1]);
                     numbitsused = 1;
                     if(buffer[buffersize-1] == 1)
                        nextstate = tagged CodedSlice 18;
                     else 
                        nextstate = tagged CodedSlice 23;
                  end
                  18:
                  begin
                     $display( "ccl2SHDmemory_management_control_operation %0d", expgolomb_unsigned(buffer) );
                     outfifo.enq(tagged SHDmemory_management_control_operation truncate(expgolomb_unsigned(buffer)));
                     shdmemory_management_control_operation <= truncate(expgolomb_unsigned(buffer));
                     numbitsused = expgolomb_numbits(buffer);
                     if(expgolomb_unsigned(buffer)!=0)
                        nextstate = tagged CodedSlice 19;
                     else
                        nextstate = tagged CodedSlice 23;
                  end
                  19:
                  begin
                     if(shdmemory_management_control_operation==1 || shdmemory_management_control_operation==3)
                        begin
                           Bit#(17) temp17 = zeroExtend(expgolomb_unsigned(buffer)) + 1;
                           $display( "ccl2SHDdifference_of_pic_nums %0d", temp17 );
                           outfifo.enq(tagged SHDdifference_of_pic_nums temp17);
                           numbitsused = expgolomb_numbits(buffer);
                           nextstate = tagged CodedSlice 20;
                        end
                     else
                        nextstate = tagged CodedSlice 20;
                  end
                  20:
                  begin
                     if(shdmemory_management_control_operation==2)
                        begin
                           $display( "ccl2SHDlong_term_pic_num %0d", expgolomb_unsigned(buffer) );
                           outfifo.enq(tagged SHDlong_term_pic_num truncate(expgolomb_unsigned(buffer)));
                           numbitsused = expgolomb_numbits(buffer);
                           nextstate = tagged CodedSlice 21;
                        end
                     else
                        nextstate = tagged CodedSlice 21;
                  end
                  21:
                  begin
                     if(shdmemory_management_control_operation==3 || shdmemory_management_control_operation==6)
                        begin
                           $display( "ccl2SHDlong_term_frame_idx %0d", expgolomb_unsigned(buffer) );
                           outfifo.enq(tagged SHDlong_term_frame_idx truncate(expgolomb_unsigned(buffer)));
                           numbitsused = expgolomb_numbits(buffer);
                           nextstate = tagged CodedSlice 22;
                        end
                     else
                        nextstate = tagged CodedSlice 22;
                  end
                  22:
                  begin
                     if(shdmemory_management_control_operation==4)
                        begin
                           $display( "ccl2SHDmax_long_term_frame_idx_plus1 %0d", expgolomb_unsigned(buffer) );
                           outfifo.enq(tagged SHDmax_long_term_frame_idx_plus1 truncate(expgolomb_unsigned(buffer)));
                           numbitsused = expgolomb_numbits(buffer);
                           nextstate = tagged CodedSlice 18;
                        end
                     else
                        nextstate = tagged CodedSlice 18;
                  end
                  23:
                  begin
                     tempint = unpack(expgolomb_signed(buffer));
                     $display( "ccl2SHslice_qp_delta %0d", tempint );
                     outfifo_ITB.enq(tagged SHslice_qp_delta truncate(expgolomb_signed(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged CodedSlice 24;
                  end
                  24:
                  begin
                     if(ppsdeblocking_filter_control_present_flag==1)
                        begin
                           $display( "ccl2SHdisable_deblocking_filter_idc %0d", expgolomb_unsigned(buffer) );
                           outfifo.enq(tagged SHdisable_deblocking_filter_idc truncate(expgolomb_unsigned(buffer)));
                           numbitsused = expgolomb_numbits(buffer);
                           if(expgolomb_unsigned(buffer)!=1)
                              nextstate = tagged CodedSlice 25;
                           else
                              nextstate = tagged CodedSlice 27;
                        end
                     else
                        nextstate = tagged CodedSlice 27;
                  end
                  25:
                  begin
                     tempint = unpack(expgolomb_signed(buffer) << 1);
                     $display( "ccl2SHslice_alpha_c0_offset %0d", tempint );
                     outfifo.enq(tagged SHslice_alpha_c0_offset truncate(expgolomb_signed(buffer) << 1));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged CodedSlice 26;
                  end
                  26:
                  begin
                     tempint = unpack(expgolomb_signed(buffer) << 1);
                     $display( "ccl2SHslice_beta_offset %0d", tempint );
                     outfifo.enq(tagged SHslice_beta_offset truncate(expgolomb_signed(buffer) << 1));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged CodedSlice 27;
                  end
                  27:
                  begin
                     nextstate = tagged SliceData 0;
                  end
                  default: $display( "ERROR EntropyDec: CodedSlice default step" );
               endcase         
            end
         tagged SEI .step : 
            begin
               nextstate = Start;
               $display( "INFO EntropyDec: SEI data thrown away" );
            end
         tagged SPS .step : 
            begin
               case ( step )
                  0:
                  begin
                     Bit#(8) outputdata = buffer[buffersize-1:buffersize-8];
                     $display( "INFO EntropyDec: profile_idc = %d", outputdata );
                     outputdata = buffer[buffersize-9:buffersize-16];
                     $display( "INFO EntropyDec: constraint_set = %b", outputdata );
                     outputdata = buffer[buffersize-17:buffersize-24];
                     $display( "INFO EntropyDec: level_idc = %d", outputdata );
                     numbitsused = 24;
                     nextstate = tagged SPS 1;
                  end
                  1:
                  begin
                     $display( "ccl2SPSseq_parameter_set_id %0d", expgolomb_unsigned(buffer) );
                     outfifo.enq(tagged SPSseq_parameter_set_id truncate(expgolomb_unsigned(buffer)));
                     spsseq_parameter_set_id <= truncate(expgolomb_unsigned(buffer));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged SPS 2;
                  end
                  2:
                  begin
                     $display( "ccl2SPSlog2_max_frame_num %0d", expgolomb_unsigned(buffer)+4 );
                     outfifo.enq(tagged SPSlog2_max_frame_num truncate(expgolomb_unsigned(buffer)+4));
                     spslog2_max_frame_num <= truncate(expgolomb_unsigned(buffer)+4);
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged SPS 3;
                  end
                  3:
                  begin
                     let tttt = expgolomb_unsigned(buffer);
                     $display( "ccl2SPSpic_order_cnt_type %0d", tttt );
                     outfifo.enq(tagged SPSpic_order_cnt_type truncate(tttt));
                     spspic_order_cnt_type <= truncate(tttt);
                     numbitsused = expgolomb_numbits(buffer);
                     if(tttt == 0) 
                        nextstate = tagged SPS 4;
                     else if(tttt == 1) 
                        nextstate = tagged SPS 5;
                     else 
                        nextstate = tagged SPS 10;
                  end
                  4:
                  begin
                     $display( "ccl2SPSlog2_max_pic_order_cnt_lsb %0d", expgolomb_unsigned(buffer)+4 );
                     outfifo.enq(tagged SPSlog2_max_pic_order_cnt_lsb truncate(expgolomb_unsigned(buffer)+4));
                     spslog2_max_pic_order_cnt_lsb <= truncate(expgolomb_unsigned(buffer)+4);
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged SPS 10;
                  end
                  5:
                  begin
                     $display( "ccl2SPSdelta_pic_order_always_zero_flag %0d", buffer[buffersize-1] );
                     outfifo.enq(tagged SPSdelta_pic_order_always_zero_flag buffer[buffersize-1]);
                     spsdelta_pic_order_always_zero_flag <= buffer[buffersize-1];
                     numbitsused = 1;
                     nextstate = tagged SPS 6;
                  end
                  6:
                  begin
                     if(egnumbits == 0)
                        begin
                           Bufcount tempbufcount = expgolomb_numbits32(buffer);
                           egnumbits <= tempbufcount;
                           numbitsused = tempbufcount-1;
                           nextstate = tagged SPS 6;
                        end
                     else
                        begin
                           tempint32 = unpack(expgolomb_signed32(buffer,egnumbits));
                           $display( "ccl2SPSoffset_for_non_ref_pic %0d", tempint32 );
                           outfifo.enq(tagged SPSoffset_for_non_ref_pic truncate(expgolomb_signed32(buffer,egnumbits)));
                           egnumbits <= 0;
                           numbitsused = egnumbits;
                           nextstate = tagged SPS 7;
                        end
                  end
                  7:
                  begin
                     if(egnumbits == 0)
                        begin
                           Bufcount tempbufcount = expgolomb_numbits32(buffer);
                           egnumbits <= tempbufcount;
                           numbitsused = tempbufcount-1;
                           nextstate = tagged SPS 7;
                        end
                     else
                        begin
                           tempint32 = unpack(expgolomb_signed32(buffer,egnumbits));
                           $display( "ccl2SPSoffset_for_top_to_bottom_field %0d", tempint32 );
                           outfifo.enq(tagged SPSoffset_for_top_to_bottom_field truncate(expgolomb_signed32(buffer,egnumbits)));
                           egnumbits <= 0;
                           numbitsused = egnumbits;
                           nextstate = tagged SPS 8;
                        end
                  end
                  8:
                  begin
                     $display( "ccl2SPSnum_ref_frames_in_pic_order_cnt_cycle %0d", expgolomb_unsigned(buffer) );
                     outfifo.enq(tagged SPSnum_ref_frames_in_pic_order_cnt_cycle truncate(expgolomb_unsigned(buffer)));
                     spsnum_ref_frames_in_pic_order_cnt_cycle <= truncate(expgolomb_unsigned(buffer));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged SPS 9;
                  end
                  9:
                  begin
                     if(spsnum_ref_frames_in_pic_order_cnt_cycle == 0) 
                        nextstate = tagged SPS 10;
                     else
                        begin
                           if(egnumbits == 0)
                              begin
                                 Bufcount tempbufcount = expgolomb_numbits32(buffer);
                                 egnumbits <= tempbufcount;
                                 numbitsused = tempbufcount-1;
                                 nextstate = tagged SPS 9;
                              end
                           else
                              begin
                                 tempint32 = unpack(expgolomb_signed32(buffer,egnumbits));
                                 $display( "ccl2SPSoffset_for_ref_frame %0d", tempint32 );
                                 outfifo.enq(tagged SPSoffset_for_ref_frame truncate(expgolomb_signed32(buffer,egnumbits)));
                                 egnumbits <= 0;
                                 spsnum_ref_frames_in_pic_order_cnt_cycle <= spsnum_ref_frames_in_pic_order_cnt_cycle - 1;
                                 numbitsused = egnumbits;
                                 nextstate = tagged SPS 9;
                              end
                        end
                  end
                  10:
                  begin
                     $display( "ccl2SPSnum_ref_frames %0d", expgolomb_unsigned(buffer) );
                     outfifo.enq(tagged SPSnum_ref_frames truncate(expgolomb_unsigned(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged SPS 11;
                  end
                  11:
                  begin
                     $display( "ccl2SPSgaps_in_frame_num_allowed_flag %0d", buffer[buffersize-1] );
                     outfifo.enq(tagged SPSgaps_in_frame_num_allowed_flag buffer[buffersize-1]);
                     numbitsused = 1;
                     nextstate = tagged SPS 12;
                  end
                  12:
                  begin
                     $display( "ccl2SPSpic_width_in_mbs %0d", expgolomb_unsigned(buffer)+1 );
                     outfifo.enq(tagged SPSpic_width_in_mbs truncate(expgolomb_unsigned(buffer)+1));
                     calcnc.initialize_picWidth(truncate(expgolomb_unsigned(buffer)+1));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged SPS 13;
                  end
                  13:
                  begin
                     $display( "ccl2SPSpic_height_in_map_units %0d", expgolomb_unsigned(buffer)+1 );
                     outfifo.enq(tagged SPSpic_height_in_map_units truncate(expgolomb_unsigned(buffer)+1));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged SPS 14;
                  end
                  14:
                  begin
                     //SPSframe_mbs_only_flag = 1 for baseline
                     numbitsused = 1;
                     nextstate = tagged SPS 15;
                  end
                  15:
                  begin
                     $display( "ccl2SPSdirect_8x8_inference_flag %0d", buffer[buffersize-1] );
                     outfifo.enq(tagged SPSdirect_8x8_inference_flag buffer[buffersize-1]);
                     numbitsused = 1;
                     nextstate = tagged SPS 16;
                  end
                  16:
                  begin
                     $display( "ccl2SPSframe_cropping_flag %0d", buffer[buffersize-1] );
                     outfifo.enq(tagged SPSframe_cropping_flag buffer[buffersize-1]);
                     numbitsused = 1;
                     if(buffer[buffersize-1] == 1) 
                        nextstate = tagged SPS 17;
                     else 
                        nextstate = tagged SPS 21;
                  end
                  17:
                  begin
                     $display( "ccl2SPSframe_crop_left_offset %0d", expgolomb_unsigned(buffer) );
                     outfifo.enq(tagged SPSframe_crop_left_offset truncate(expgolomb_unsigned(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged SPS 18;
                  end
                  18:
                  begin
                     $display( "ccl2SPSframe_crop_right_offset %0d", expgolomb_unsigned(buffer) );
                     outfifo.enq(tagged SPSframe_crop_right_offset truncate(expgolomb_unsigned(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged SPS 19;
                  end
                  19:
                  begin
                     $display( "ccl2SPSframe_crop_top_offset %0d", expgolomb_unsigned(buffer) );
                     outfifo.enq(tagged SPSframe_crop_top_offset truncate(expgolomb_unsigned(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged SPS 20;
                  end
                  20:
                  begin
                     $display( "ccl2SPSframe_crop_bottom_offset %0d", expgolomb_unsigned(buffer) );
                     outfifo.enq(tagged SPSframe_crop_bottom_offset truncate(expgolomb_unsigned(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged SPS 21;
                  end
                  21:
                  begin
                     nextstate = Start;
                     $display( "INFO EntropyDec:VUI data thrown away" );
                  end
                  default: $display( "ERROR EntropyDec: SPS default step" );
               endcase
            end
         tagged PPS .step : 
            begin
               case ( step )
                  0:
                  begin
                     ppspic_parameter_set_id <= truncate(expgolomb_unsigned(buffer));
                     $display( "ccl2PPSpic_parameter_set_id %0d", expgolomb_unsigned(buffer) );
                     outfifo.enq(tagged PPSpic_parameter_set_id truncate(expgolomb_unsigned(buffer)));
                     outfifo_ITB.enq(tagged PPSpic_parameter_set_id truncate(expgolomb_unsigned(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged PPS 1;
                  end
                  1:
                  begin
                     $display( "ccl2PPSseq_parameter_set_id %0d", expgolomb_unsigned(buffer) );
                     outfifo.enq(tagged PPSseq_parameter_set_id truncate(expgolomb_unsigned(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged PPS 2;
                     if(spsseq_parameter_set_id != truncate(expgolomb_unsigned(buffer))) 
                        $display( "ERROR EntropyDec: seq_parameter_set_id don't match" );
                  end
                  2:
                  begin
                     //PPSentropy_coding_mode_flag = 0 for baseline
                     numbitsused = 1;
                     nextstate = tagged PPS 3;
                  end
                  3:
                  begin
                     ppspic_order_present_flag <= buffer[buffersize-1];
                     $display( "ccl2PPSpic_order_present_flag %0d", buffer[buffersize-1] );
                     outfifo.enq(tagged PPSpic_order_present_flag buffer[buffersize-1]);
                     numbitsused = 1;
                     nextstate = tagged PPS 4;
                  end
                  4:
                  begin
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged PPS 5;
                     if(expgolomb_unsigned(buffer)+1 != 1) 
                        $display( "ERROR EntropyDec: PPSnum_slice_groups not equal to 1" );//=1 for main
                  end
                  5:
                  begin
                     $display( "ccl2PPSnum_ref_idx_l0_active %0d", expgolomb_unsigned(buffer)+1 );
                     outfifo.enq(tagged PPSnum_ref_idx_l0_active truncate(expgolomb_unsigned(buffer)+1));
                     num_ref_idx_l0_active_minus1 <= truncate(expgolomb_unsigned(buffer));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged PPS 6;
                  end
                  6:
                  begin
                     $display( "ccl2PPSnum_ref_idx_l1_active %0d", expgolomb_unsigned(buffer)+1 );
                     outfifo.enq(tagged PPSnum_ref_idx_l1_active truncate(expgolomb_unsigned(buffer)+1));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged PPS 7;
                  end
                  7:
                  begin
                     //PPSweighted_pred_flag = 0 for baseline; PPSweighted_bipred_idc = 0 for baseline
                     numbitsused = 3;
                     nextstate = tagged PPS 8;
                  end
                  8:
                  begin
                     $display( "ccl2PPSpic_init_qp %0d", expgolomb_signed(buffer)+26 );
                     outfifo_ITB.enq(tagged PPSpic_init_qp truncate(expgolomb_signed(buffer)+26));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged PPS 9;
                  end
                  9:
                  begin
                     $display( "ccl2PPSpic_init_qs %0d", expgolomb_signed(buffer)+26 );
                     outfifo_ITB.enq(tagged PPSpic_init_qs truncate(expgolomb_signed(buffer)+26));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged PPS 10;
                  end
                  10:
                  begin
                     tempint = unpack(expgolomb_signed(buffer));
                     $display( "ccl2PPSchroma_qp_index_offset %0d", tempint );
                     outfifo_ITB.enq(tagged PPSchroma_qp_index_offset truncate(expgolomb_signed(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged PPS 11;
                  end
                  11:
                  begin
                     ppsdeblocking_filter_control_present_flag <= buffer[buffersize-1];
                     $display( "ccl2PPSdeblocking_filter_control_present_flag %0d", buffer[buffersize-1] );
                     outfifo.enq(tagged PPSdeblocking_filter_control_present_flag buffer[buffersize-1]);
                     numbitsused = 1;
                     nextstate = tagged PPS 12;
                  end
                  12:
                  begin
                     $display( "ccl2PPSconstrained_intra_pred_flag %0d", buffer[buffersize-1] );
                     outfifo.enq(tagged PPSconstrained_intra_pred_flag buffer[buffersize-1]);
                     numbitsused = 1;
                     nextstate = tagged PPS 13;
                  end
                  13:
                  begin
                     //PPSredundant_pic_cnt_present_flag = 0 for main
                     numbitsused = 1;
                     nextstate = tagged PPS 14;
                     if(buffer[buffersize-1] != 0) 
                        $display( "ERROR EntropyDec: PPSredundant_pic_cnt_present_flag not equal to 0" );//=0 for main
                  end
                  14:
                  begin
                     nextstate = Start;
                  end
                  default: $display( "ERROR EntropyDec: PPS default step" );
               endcase
            end
         tagged AUD .step : 
            begin
               outfifo.enq(tagged AUDPrimaryPicType buffer[buffersize-1:buffersize-3]);
               numbitsused = 3;
               nextstate = Start;
            end
         tagged EndSequence : 
            begin
               outfifo.enq(tagged EndOfSequence);
               nextstate = Start;
            end
         tagged EndStream : 
            begin
               outfifo.enq(tagged EndOfStream);
               nextstate = Start;
            end
         tagged Filler : 
            begin
               nextstate = Start;
            end
         tagged SliceData .step : 
            begin
               case ( step )
                  0:
                  begin
                     if( shslice_type!=2 && shslice_type!=7 )
                        begin
                           $display( "ccl2SDmb_skip_run %0d", expgolomb_unsigned(buffer) );
                           outfifo.enq(tagged SDmb_skip_run truncate(expgolomb_unsigned(buffer)));
                           tempreg <= truncate(expgolomb_unsigned(buffer));
                           calcnc.nNupdate_pskip( truncate(expgolomb_unsigned(buffer)) );
                           numbitsused = expgolomb_numbits(buffer);
                           nextstate = tagged SliceData 1;
                        end
                     else
                        nextstate = tagged SliceData 2;
                  end
                  1:
                  begin
                     if( tempreg>0 )
                        begin
                           currMbAddr <= currMbAddr+1;//only because input assumed to comform to both baseline and main
                           tempreg <= tempreg-1;
                           nextstate = tagged SliceData 1;
                        end
                     else
                        begin
                           ////$display( "ccl2SDcurrMbAddr %0d", currMbAddr );
                           ////outfifo.enq(SDcurrMbAddr currMbAddr);
                           nextstate = tagged SliceData 2;
                        end
                  end
                  2:
                  begin
                     if( bufcount>8 || buffer[buffersize-1]!=1 || (buffer<<1)!=0 )
                        begin
                           calcnc.loadMb(currMbAddr);
                           nextstate = tagged MacroblockLayer 0;
                        end
                     else
                        nextstate = tagged SliceData 3;
                  end
                  3:
                  begin
                     currMbAddr <= currMbAddr+1;//only because input assumed to comform to both baseline and main
                     if( bufcount>8 || buffer[buffersize-1]!=1 || (buffer<<1)!=0 )
                        nextstate = tagged SliceData 0;
                     else
                        nextstate = Start;
                  end
                  default: $display( "ERROR EntropyDec: SliceData default step" );
               endcase
            end
         tagged MacroblockLayer .step : //return to SliceData 3
            begin
               case ( step )
                  0:
                  begin
                     $display( "ccl2SDMmb_type %0d", expgolomb_unsigned(buffer) );
                     outfifo.enq(tagged SDMmbtype mbtype_convert(truncate(expgolomb_unsigned(buffer)), shslice_type) );
                     outfifo_ITB.enq(tagged SDMmbtype mbtype_convert(truncate(expgolomb_unsigned(buffer)), shslice_type) );
                     sdmmbtype <= mbtype_convert(truncate(expgolomb_unsigned(buffer)), shslice_type);
                     numbitsused = expgolomb_numbits(buffer);
                     if(mbtype_convert(truncate(expgolomb_unsigned(buffer)), shslice_type) == I_PCM)
                        begin
                           calcnc.nNupdate_ipcm();
                           nextstate = tagged MacroblockLayer 1;
                        end
                     else
                        nextstate = tagged MacroblockLayer 4;
                  end
                  1:
                  begin
                     tempreg <= 256;
                     numbitsused = zeroExtend(bufcount[2:0]);
                     nextstate = tagged MacroblockLayer 2;
                  end
                  2:
                  begin
                     if( tempreg>0 )
                        begin
                           Bit#(8) outputdata = buffer[buffersize-1:buffersize-8];
                           $display( "ccl2SDMpcm_sample_luma %0d", outputdata );
                           outfifo.enq(tagged SDMpcm_sample_luma outputdata);
                           tempreg <= tempreg-1;
                           numbitsused = 8;
                           nextstate = tagged MacroblockLayer 2;
                        end
                     else
                        begin
                           tempreg <= 128;
                           nextstate = tagged MacroblockLayer 3;
                        end
                  end
                  3:
                  begin
                     if( tempreg>0 )
                        begin
                           Bit#(8) outputdata = buffer[buffersize-1:buffersize-8];
                           $display( "ccl2SDMpcm_sample_chroma %0d", outputdata );
                           outfifo.enq(tagged SDMpcm_sample_chroma outputdata);
                           tempreg <= tempreg-1;
                           numbitsused = 8;
                           nextstate = tagged MacroblockLayer 3;
                        end
                     else
                           nextstate = tagged SliceData 3;
                  end
                  4:
                  begin
                     if(sdmmbtype != I_NxN
                        &&& mbPartPredMode(sdmmbtype,0) != Intra_16x16
                        &&& numMbPart(sdmmbtype) == 4)
                        nextstate = tagged SubMbPrediction 0;
                     else
                        nextstate = tagged MbPrediction 0;
                  end
                  5:
                  begin
                     if(mbPartPredMode(sdmmbtype,0) != Intra_16x16)
                        begin
                           $display( "ccl2SDMcoded_block_pattern %0d", expgolomb_coded_block_pattern(buffer,sdmmbtype) );
                           ////outfifo.enq(SDMcoded_block_pattern expgolomb_coded_block_pattern(buffer,sdmmbtype));
                           sdmcodedBlockPatternLuma <= expgolomb_coded_block_pattern(buffer,sdmmbtype)[3:0];
                           sdmcodedBlockPatternChroma <= expgolomb_coded_block_pattern(buffer,sdmmbtype)[5:4];
                           numbitsused = expgolomb_numbits(buffer);
                        end
                     else
                        begin
                           if(sdmmbtype matches tagged I_16x16 {intra16x16PredMode:.tempv1, codedBlockPatternChroma:.tempv2, codedBlockPatternLuma:.tempv3})
                              begin
                                 sdmcodedBlockPatternLuma <= {tempv3,tempv3,tempv3,tempv3};
                                 sdmcodedBlockPatternChroma <= tempv2;
                              end
                           else
                              $display( "ERROR EntropyDec: MacroblockLayer 5 sdmmbtype not I_16x16" );
                        end
                     nextstate = tagged MacroblockLayer 6;
                  end
                  6:
                  begin
                     if(sdmcodedBlockPatternLuma > 0
                        || sdmcodedBlockPatternChroma > 0
                        || mbPartPredMode(sdmmbtype,0) == Intra_16x16)
                        begin
                           tempint = unpack(expgolomb_signed(buffer));
                           $display( "ccl2SDMmb_qp_delta %0d", tempint );
                           outfifo_ITB.enq(tagged SDMmb_qp_delta truncate(expgolomb_signed(buffer)));
                           numbitsused = expgolomb_numbits(buffer);
                        end
                     residualChroma <= 0;
                     temp5bit <= 0;
                     maxNumCoeff <= 16;
                     nextstate = tagged ResidualBlock 0;
                  end
                  default: $display( "ERROR EntropyDec: MacroblockLayer default step" );
               endcase
            end
         tagged MbPrediction .step : //return to tagged MacroblockLayer 5
            begin
               case ( step )
                  0:
                  begin
                     if(mbPartPredMode(sdmmbtype,0) == Intra_16x16)
                        begin
                           $display( "ccl2SDMMintra_chroma_pred_mode %0d", expgolomb_unsigned(buffer) );
                           outfifo.enq(tagged SDMMintra_chroma_pred_mode truncate(expgolomb_unsigned(buffer)));
                           numbitsused = expgolomb_numbits(buffer);
                           nextstate = tagged MacroblockLayer 5;
                        end
                     else if(mbPartPredMode(sdmmbtype,0) == Intra_4x4)
                        begin
                           temp5bit <= 16;
                           nextstate = tagged MbPrediction 1;
                        end
                     else if(num_ref_idx_l0_active_minus1 > 0)
                        begin
                           temp3bit0 <= numMbPart(sdmmbtype);
                           nextstate = tagged MbPrediction 2;
                        end
                     else
                        begin
                           temp3bit0 <= numMbPart(sdmmbtype);
                           nextstate = tagged MbPrediction 3;
                        end
                  end
                  1:
                  begin
                     if(temp5bit == 0)
                        begin
                           $display( "ccl2SDMMintra_chroma_pred_mode %0d", expgolomb_unsigned(buffer) );
                           outfifo.enq(tagged SDMMintra_chroma_pred_mode truncate(expgolomb_unsigned(buffer)));
                           numbitsused = expgolomb_numbits(buffer);
                           nextstate = tagged MacroblockLayer 5;
                        end
                     else
                        begin
                           ////$display( "ccl2SDMMprev_intra4x4_pred_mode_flag %0d", buffer[buffersize-1] );
                           if(buffer[buffersize-1] == 0)
                              begin
                                 Bit#(4) tttt = buffer[buffersize-1:buffersize-4];
                                 $display( "ccl2SDMMrem_intra4x4_pred_mode %0d", tttt );
                                 outfifo.enq(tagged SDMMrem_intra4x4_pred_mode tttt);
                                 numbitsused = 4;
                              end
                           else
                              begin
                                 outfifo.enq(tagged SDMMrem_intra4x4_pred_mode 4'b1000);
                                 numbitsused = 1;
                              end
                           temp5bit <= temp5bit-1;
                           nextstate = tagged MbPrediction 1;
                        end
                  end
                  2:
                  begin
                     if(num_ref_idx_l0_active_minus1 == 1)
                        begin
                           $display( "ccl2SDMMref_idx_l0 %0d", 1-buffer[buffersize-1] );
                           outfifo.enq(tagged SDMMref_idx_l0 zeroExtend(1-buffer[buffersize-1]));
                           numbitsused = 1;
                        end
                     else
                        begin
                           $display( "ccl2SDMMref_idx_l0 %0d", expgolomb_unsigned(buffer) );
                           outfifo.enq(tagged SDMMref_idx_l0 truncate(expgolomb_unsigned(buffer)));
                           numbitsused = expgolomb_numbits(buffer);
                        end
                     if(temp3bit0 == 1)
                        begin
                           temp3bit0 <= numMbPart(sdmmbtype);
                           nextstate = tagged MbPrediction 3;
                        end
                     else
                        begin
                           temp3bit0 <= temp3bit0-1;
                           nextstate = tagged MbPrediction 2;
                        end
                  end
                  3:
                  begin
                     tempint = unpack(expgolomb_signed(buffer));
                     $display( "ccl2SDMMmvd_l0 %0d", tempint );
                     outfifo.enq(tagged SDMMmvd_l0 truncate(expgolomb_signed(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged MbPrediction 4;
                  end
                  4:
                  begin
                     tempint = unpack(expgolomb_signed(buffer));
                     $display( "ccl2SDMMmvd_l0 %0d", tempint );
                     outfifo.enq(tagged SDMMmvd_l0 truncate(expgolomb_signed(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     temp3bit0 <= temp3bit0-1;
                     if(temp3bit0 == 1)
                        nextstate = tagged MacroblockLayer 5;
                     else
                        nextstate = tagged MbPrediction 3;
                  end
                  default: $display( "ERROR EntropyDec: MbPrediction default step" );
               endcase
            end
         tagged SubMbPrediction .step : //return to MacroblockLayer 5
            begin
               case ( step )
                  0:
                  begin
                     $display( "ccl2SDMSsub_mb_type %0d", expgolomb_unsigned(buffer) );
                     outfifo.enq(tagged SDMSsub_mb_type truncate(expgolomb_unsigned(buffer)));
                     temp3bit0 <= numSubMbPart(truncate(expgolomb_unsigned(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged SubMbPrediction 1;
                  end
                  1:
                  begin
                     $display( "ccl2SDMSsub_mb_type %0d", expgolomb_unsigned(buffer) );
                     outfifo.enq(tagged SDMSsub_mb_type truncate(expgolomb_unsigned(buffer)));
                     temp3bit1 <= numSubMbPart(truncate(expgolomb_unsigned(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged SubMbPrediction 2;
                  end
                  2:
                  begin
                     $display( "ccl2SDMSsub_mb_type %0d", expgolomb_unsigned(buffer) );
                     outfifo.enq(tagged SDMSsub_mb_type truncate(expgolomb_unsigned(buffer)));
                     temp3bit2 <= numSubMbPart(truncate(expgolomb_unsigned(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged SubMbPrediction 3;
                  end
                  3:
                  begin
                     $display( "ccl2SDMSsub_mb_type %0d", expgolomb_unsigned(buffer) );
                     outfifo.enq(tagged SDMSsub_mb_type truncate(expgolomb_unsigned(buffer)));
                     temp3bit3 <= numSubMbPart(truncate(expgolomb_unsigned(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     if(num_ref_idx_l0_active_minus1 > 0
                              && sdmmbtype != P_8x8ref0)
                        nextstate = tagged SubMbPrediction 4;
                     else
                        nextstate = tagged SubMbPrediction 8;
                  end
                  4:
                  begin
                     if(num_ref_idx_l0_active_minus1 == 1)
                        begin
                           $display( "ccl2SDMSref_idx_l0 %0d", 1-buffer[buffersize-1] );
                           outfifo.enq(tagged SDMSref_idx_l0 zeroExtend(1-buffer[buffersize-1]));
                           numbitsused = 1;
                        end
                     else
                        begin
                           $display( "ccl2SDMSref_idx_l0 %0d", expgolomb_unsigned(buffer) );
                           outfifo.enq(tagged SDMSref_idx_l0 truncate(expgolomb_unsigned(buffer)));
                           numbitsused = expgolomb_numbits(buffer);
                        end
                     nextstate = tagged SubMbPrediction 5;
                  end
                  5:
                  begin
                     if(num_ref_idx_l0_active_minus1 == 1)
                        begin
                           $display( "ccl2SDMSref_idx_l0 %0d", 1-buffer[buffersize-1] );
                           outfifo.enq(tagged SDMSref_idx_l0 zeroExtend(1-buffer[buffersize-1]));
                           numbitsused = 1;
                        end
                     else
                        begin
                           $display( "ccl2SDMSref_idx_l0 %0d", expgolomb_unsigned(buffer) );
                           outfifo.enq(tagged SDMSref_idx_l0 truncate(expgolomb_unsigned(buffer)));
                           numbitsused = expgolomb_numbits(buffer);
                        end
                     nextstate = tagged SubMbPrediction 6;
                  end
                  6:
                  begin
                     if(num_ref_idx_l0_active_minus1 == 1)
                        begin
                           $display( "ccl2SDMSref_idx_l0 %0d", 1-buffer[buffersize-1] );
                           outfifo.enq(tagged SDMSref_idx_l0 zeroExtend(1-buffer[buffersize-1]));
                           numbitsused = 1;
                        end
                     else
                        begin
                           $display( "ccl2SDMSref_idx_l0 %0d", expgolomb_unsigned(buffer) );
                           outfifo.enq(tagged SDMSref_idx_l0 truncate(expgolomb_unsigned(buffer)));
                           numbitsused = expgolomb_numbits(buffer);
                        end
                     nextstate = tagged SubMbPrediction 7;
                  end
                  7:
                  begin
                     if(num_ref_idx_l0_active_minus1 == 1)
                        begin
                           $display( "ccl2SDMSref_idx_l0 %0d", 1-buffer[buffersize-1] );
                           outfifo.enq(tagged SDMSref_idx_l0 zeroExtend(1-buffer[buffersize-1]));
                           numbitsused = 1;
                        end
                     else
                        begin
                           $display( "ccl2SDMSref_idx_l0 %0d", expgolomb_unsigned(buffer) );
                           outfifo.enq(tagged SDMSref_idx_l0 truncate(expgolomb_unsigned(buffer)));
                           numbitsused = expgolomb_numbits(buffer);
                        end
                     nextstate = tagged SubMbPrediction 8;
                  end
                  8:
                  begin
                     tempint = unpack(expgolomb_signed(buffer));
                     $display( "ccl2SDMSmvd_l0 %0d", tempint );
                     outfifo.enq(tagged SDMSmvd_l0 truncate(expgolomb_signed(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged SubMbPrediction 9;
                  end
                  9:
                  begin
                     tempint = unpack(expgolomb_signed(buffer));
                     $display( "ccl2SDMSmvd_l0 %0d", tempint );
                     outfifo.enq(tagged SDMSmvd_l0 truncate(expgolomb_signed(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     temp3bit0 <= temp3bit0-1;
                     if(temp3bit0 == 1)
                        nextstate = tagged SubMbPrediction 10;
                     else
                        nextstate = tagged SubMbPrediction 8;
                  end
                  10:
                  begin
                     tempint = unpack(expgolomb_signed(buffer));
                     $display( "ccl2SDMSmvd_l0 %0d", tempint );
                     outfifo.enq(tagged SDMSmvd_l0 truncate(expgolomb_signed(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged SubMbPrediction 11;
                  end
                  11:
                  begin
                     tempint = unpack(expgolomb_signed(buffer));
                     $display( "ccl2SDMSmvd_l0 %0d", tempint );
                     outfifo.enq(tagged SDMSmvd_l0 truncate(expgolomb_signed(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     temp3bit1 <= temp3bit1-1;
                     if(temp3bit1 == 1)
                        nextstate = tagged SubMbPrediction 12;
                     else
                        nextstate = tagged SubMbPrediction 10;
                  end
                  12:
                  begin
                     tempint = unpack(expgolomb_signed(buffer));
                     $display( "ccl2SDMSmvd_l0 %0d", tempint );
                     outfifo.enq(tagged SDMSmvd_l0 truncate(expgolomb_signed(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged SubMbPrediction 13;
                  end
                  13:
                  begin
                     tempint = unpack(expgolomb_signed(buffer));
                     $display( "ccl2SDMSmvd_l0 %0d", tempint );
                     outfifo.enq(tagged SDMSmvd_l0 truncate(expgolomb_signed(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     temp3bit2 <= temp3bit2-1;
                     if(temp3bit2 == 1)
                        nextstate = tagged SubMbPrediction 14;
                     else
                        nextstate = tagged SubMbPrediction 12;
                  end
                  14:
                  begin
                     tempint = unpack(expgolomb_signed(buffer));
                     $display( "ccl2SDMSmvd_l0 %0d", tempint );
                     outfifo.enq(tagged SDMSmvd_l0 truncate(expgolomb_signed(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     nextstate = tagged SubMbPrediction 15;
                  end
                  15:
                  begin
                     tempint = unpack(expgolomb_signed(buffer));
                     $display( "ccl2SDMSmvd_l0 %0d", tempint );
                     outfifo.enq(tagged SDMSmvd_l0 truncate(expgolomb_signed(buffer)));
                     numbitsused = expgolomb_numbits(buffer);
                     temp3bit3 <= temp3bit3-1;
                     if(temp3bit3 == 1)
                        nextstate = tagged MacroblockLayer 5;
                     else
                        nextstate = tagged SubMbPrediction 14;
                  end
                  default: $display( "ERROR EntropyDec: SubMbPrediction default step" );
               endcase
            end
         tagged ResidualBlock .step : //if(residualChroma==0) return to Residual 1;   else if(maxNumCoeff==4) return to Residual 3;   else return to Residual 5
            begin//don't modify maxNumCoeff, residualChroma, and increment temp5bit on return
               case ( step )
                  0:
                  begin
                     cavlcFIFO.clear();
                     if(maxNumCoeff != 4)
                        begin
                           if(residualChroma == 0)
                              tempreg <= zeroExtend(calcnc.nCcalc_luma(truncate(temp5bit)));
                           else
                              tempreg <= zeroExtend(calcnc.nCcalc_chroma(truncate(temp5bit)));
                        end
                     else
                        tempreg <= zeroExtend(6'b111111);
                     if(mbPartPredMode(sdmmbtype,0)==Intra_16x16 && maxNumCoeff==16)
                        nextstate = tagged ResidualBlock 1;
                     else if(residualChroma==0 && (sdmcodedBlockPatternLuma & (1 << zeroExtend(temp5bit[3:2])))==0)
                        begin
                           calcnc.nNupdate_luma(truncate(temp5bit),0);
                           outfifo_ITB.enq(tagged SDMRcoeffLevelZeros maxNumCoeff);
                           nextstate = tagged ResidualBlock 5;
                        end
                     else if(residualChroma==1 && maxNumCoeff==4 && (sdmcodedBlockPatternChroma & 3)==0)
                        begin
                           outfifo_ITB.enq(tagged SDMRcoeffLevelZeros 4);
                           nextstate = tagged ResidualBlock 5;
                        end
                     else if(residualChroma==1 && maxNumCoeff!=4 && (sdmcodedBlockPatternChroma & 2)==0)
                        begin
                           calcnc.nNupdate_chroma(truncate(temp5bit),0);
                           outfifo_ITB.enq(tagged SDMRcoeffLevelZeros 15);
                           nextstate = tagged ResidualBlock 5;
                        end
                     else
                        nextstate = tagged ResidualBlock 1;
                     //$display( "TRACE EntropyDec: ResidualBlock 0 temp5bit = %0d", temp5bit);
                  end
                  1:
                  begin
                     Bit#(2) trailingOnesTemp = 0;
                     Bit#(5) totalCoeffTemp = 0;
                     {trailingOnesTemp,totalCoeffTemp,numbitsused} = cavlc_coeff_token( buffer, truncate(tempreg) );
                     temp3bit0 <= zeroExtend(trailingOnesTemp);//trailingOnes
                     totalCoeff <= totalCoeffTemp;
                     if(residualChroma == 0 && !(mbPartPredMode(sdmmbtype,0)==Intra_16x16 && maxNumCoeff==16))
                        calcnc.nNupdate_luma(truncate(temp5bit),totalCoeffTemp);
                     else if(residualChroma == 1 && maxNumCoeff != 4)
                        calcnc.nNupdate_chroma(truncate(temp5bit),totalCoeffTemp);
                     temp5bit2 <= 0;//i
                     tempreg <= 0;//levelCode temp
                     if(totalCoeffTemp > 10 && trailingOnesTemp < 3)
                        temp3bit1 <= 1;//suffixLength
                     else
                        temp3bit1 <= 0;//suffixLength
                     nextstate = tagged ResidualBlock 2;
                     //$display( "TRACE EntropyDec: ResidualBlock 1 nC = %0d", tempreg);
                     $display( "ccl2SDMRtotal_coeff %0d", totalCoeffTemp );
                     $display( "ccl2SDMRtrailing_ones %0d", trailingOnesTemp );
                  end
                  2:
                  begin
                     if( totalCoeff != 0 )
                        begin
                           if(temp5bit2 < zeroExtend(temp3bit0))
                              begin
                                 if(buffer[buffersize-1] == 1)
                                    cavlcFIFO.enq(-1);
                                 else
                                    cavlcFIFO.enq(1);
                                 numbitsused = 1;
                              end
                           else
                              begin
                                 Bit#(32) buffertempshow = buffer[buffersize-1:buffersize-32];
                                 Bit#(3) suffixLength = temp3bit1;
                                 Bit#(4) levelSuffixSize = zeroExtend(suffixLength);
                                 Bit#(4) level_prefix = cavlc_level_prefix( buffer );
                                 Bit#(5) temp_level_prefix = zeroExtend(level_prefix);
                                 Bit#(28) tempbuffer = buffer[buffersize-1:buffersize-28] << zeroExtend(temp_level_prefix+1);
                                 Bit#(14) levelCode = zeroExtend(level_prefix) << zeroExtend(suffixLength);
                                 if(level_prefix == 14 && suffixLength == 0)
                                    levelSuffixSize = 4;
                                 else if(level_prefix == 15)
                                    levelSuffixSize = 12;
                                 levelCode = levelCode + zeroExtend(tempbuffer[27:16] >> (12-zeroExtend(levelSuffixSize)));//level_suffix
                                 if(level_prefix == 15 && suffixLength == 0)
                                    levelCode = levelCode + 15;
                                 if(temp5bit2 == zeroExtend(temp3bit0) && temp3bit0 < 3)
                                    levelCode = levelCode + 2;
                                 if(suffixLength == 0)
                                    suffixLength = 1;
                                 if( suffixLength < 6 && ((levelCode+2) >> 1) > (3 << zeroExtend(suffixLength-1)) )
                                    suffixLength = suffixLength+1;
                                 if(levelCode[0] == 0)
                                    cavlcFIFO.enq(truncate((levelCode+2) >> 1));
                                 else
                                    cavlcFIFO.enq(truncate((~levelCode) >> 1));
                                 if(levelCode[0] == 0)//////////////////////////////////////////////////
                                    begin
                                       tempint = signExtend(unpack((levelCode+2) >> 1));
                                       //$display( "TRACE EntropyDec: temp level %0d", tempint );
                                    end
                                 else
                                    begin
                                       Bit#(13) tempinttemp = truncate((~levelCode) >> 1);
                                       tempint = signExtend(unpack(tempinttemp));
                                       //$display( "TRACE EntropyDec: temp level %0d", tempint );
                                    end///////////////////////////////////////////////////////////////////////
                                 temp3bit1 <= suffixLength;
                                 numbitsused = zeroExtend(level_prefix)+1+zeroExtend(levelSuffixSize);
                              end
                        end
                     if( totalCoeff==0 || temp5bit2+1==totalCoeff )
                        begin
                           temp5bit2 <= 0;
                           zerosLeft <= 0;
                           if(totalCoeff < maxNumCoeff)
                              nextstate = tagged ResidualBlock 3;
                           else
                              nextstate = tagged ResidualBlock 5;
                        end
                     else
                        begin
                           temp5bit2 <= temp5bit2 + 1;
                           nextstate = tagged ResidualBlock 2;
                        end
                  end
                  3:
                  begin
                     Bit#(4) tempZerosLeft;
                     if(totalCoeff > 0)
                        begin
                           {tempZerosLeft,numbitsused} = cavlc_total_zeros( buffer, truncate(totalCoeff), maxNumCoeff);
                           $display( "ccl2SDMRtotal_zeros %0d", tempZerosLeft );//////////////////////////////////////
                        end
                     else
                        tempZerosLeft = 0;
                     zerosLeft <= tempZerosLeft;
                     if(maxNumCoeff - totalCoeff - zeroExtend(tempZerosLeft) > 0)
                        begin
                           $display( "ccl2SDMRcoeffLevelZeros %0d", maxNumCoeff - totalCoeff - zeroExtend(tempZerosLeft) );
                           outfifo_ITB.enq(tagged SDMRcoeffLevelZeros (maxNumCoeff - totalCoeff - zeroExtend(tempZerosLeft)));
                        end
                     nextstate = tagged ResidualBlock 5;
                  end
                  5:
                  begin
                     if( totalCoeff > 0 )
                        begin
                           tempint = signExtend(unpack(cavlcFIFO.first()));
                           $display( "ccl2SDMRcoeffLevel %0d", tempint );
                           if( zerosLeft > 0 )
                              begin
                                 Bit#(4) run_before = 0;
                                 if( totalCoeff > 1 )
                                    {run_before,numbitsused} = cavlc_run_before( buffer, zerosLeft);
                                 else
                                    run_before = zerosLeft;
                                 zerosLeft <= zerosLeft - run_before;
                                 outfifo_ITB.enq(tagged SDMRcoeffLevelPlusZeros {level:cavlcFIFO.first(),zeros:zeroExtend(run_before)});
                                 if( run_before > 0 )
                                    $display( "ccl2SDMRcoeffLevelZeros %0d", run_before );
                              end
                           else
                              outfifo_ITB.enq(tagged SDMRcoeffLevelPlusZeros {level:cavlcFIFO.first(),zeros:0});
                           cavlcFIFO.deq();
                           totalCoeff <= totalCoeff-1;
                        end
                     if( totalCoeff <= 1 )
                        begin
                           if(residualChroma==0)
                              begin
                                 nextstate = tagged ResidualBlock 0;
                                 if(mbPartPredMode(sdmmbtype,0)==Intra_16x16 && maxNumCoeff==16)
                                    maxNumCoeff <= 15;
                                 else if(temp5bit==15)
                                    begin
                                       temp5bit <= 0;
                                       maxNumCoeff <= 4;
                                       residualChroma <= 1;
                                    end
                                 else
                                    temp5bit <= temp5bit+1;
                              end
                           else if(maxNumCoeff==4)
                              begin
                                 nextstate = tagged ResidualBlock 0;
                                 if(temp5bit==1)
                                    begin
                                       temp5bit <= 0;
                                       maxNumCoeff <= 15;
                                    end
                                 else
                                    temp5bit <= temp5bit+1;
                              end
                           else
                              begin    
                                 if(temp5bit==7)
                                    begin
                                       temp5bit <= 0;
                                       nextstate = tagged SliceData 3;
                                    end
                                 else
                                    begin
                                       nextstate = tagged ResidualBlock 0;
                                       temp5bit <= temp5bit+1;
                                    end
                              end
                        end
                     else
                        nextstate = tagged ResidualBlock 5;
                  end
                  default: $display( "ERROR EntropyDec: ResidualBlock default step" );
               endcase
            end
      endcase
      
      if(numbitsused+1 > bufcount)
         begin
            $display( "ERROR EntropyDec: not enough bits in buffer" );
            nextstate = Start;
         end
      buffer <= buffer << zeroExtend(numbitsused);
      bufcount <= bufcount-numbitsused;
      state <= nextstate;
      
   endrule
   
   
   interface Put ioin  = fifoToPut(infifo);
   interface Get ioout = fifoToGet(outfifo);
   interface Get ioout_InverseTrans = fifoToGet(outfifo_ITB);

   interface mem_client = calcnc.mem_client; 
      
endmodule

endpackage