Subversion Repositories bluespec-h264

// The MIT License

// Copyright (c) 2006-2007 Massachusetts Institute of Technology

// Permission is hereby granted, free of charge, to any person obtaining a copy

// of this software and associated documentation files (the "Software"), to deal

// in the Software without restriction, including without limitation the rights

// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

// copies of the Software, and to permit persons to whom the Software is

// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in

// all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

// THE SOFTWARE.

//**********************************************************************

// Buffer Controller

//----------------------------------------------------------------------

//

//

package mkBufferControl;

import H264Types::*;

import IBufferControl::*;

import FIFO::*;

import Vector::*;

import Connectable::*;

import GetPut::*;

import ClientServer::*;

//-----------------------------------------------------------

// Local Datatypes

//-----------------------------------------------------------

typedef union tagged

{

 void     Idle;          //not working on anything in particular

 void     Y;

 void     U;

 void     V;

}

Outprocess deriving(Eq,Bits);

//-----------------------------------------------------------

// Short term pic list submodule

//-----------------------------------------------------------

typedef union tagged

{

 void     Idle;          //not working on anything in particular

 void     Remove;

 void     RemoveOutput;

 void     RemoveFound;

 void     InsertGap;

 void     Search;

 void     ListAll;

}

ShortTermPicListState deriving(Eq,Bits);

interface ShortTermPicList;

   method Action clear();

   method Action insert( Bit#(16) frameNum, Bit#(5) slot, Bit#(5) maxAllowed );

   method Action insert_gap( Bit#(16) frameNum, Bit#(5) slot, Bit#(5) maxAllowed, Bit#(16) gap, Bit#(5) log2_max_frame_num );

   method Action remove( Bit#(16) frameNum, Bool removeOutputFlag );

   method Action search( Bit#(16) frameNum );

   method Action listAll();

   method Action deq();

   method Maybe#(Bit#(5)) resultSlot();

   method Bit#(5) numPics();

endinterface

module mkShortTermPicList( ShortTermPicList );

   function Bit#(5) shortTermPicListNext( Bit#(5) addrFunc );

      if(addrFunc

         return addrFunc+1;

      else

         return 0;

   endfunction

   function Bit#(5) shortTermPicListPrev( Bit#(5) addrFunc );

      if(addrFunc==0)

         return maxRefFrames-1;

      else

         return addrFunc-1;

   endfunction

   RFile1#(Bit#(5),Tuple2#(Bit#(16),Bit#(5))) rfile <- mkRFile1(0,maxRefFrames-1);

   Reg#(ShortTermPicListState) state <- mkReg(Idle);

   Reg#(Bit#(5))  log2_mfn  <- mkReg(0);

   Reg#(Bit#(5))  nextPic   <- mkReg(0);

   Reg#(Bit#(5))  picCount  <- mkReg(0);

   Reg#(Bit#(5))  tempPic   <- mkReg(0);

   Reg#(Bit#(5))  tempCount <- mkReg(0);

   Reg#(Bit#(16)) tempNum   <- mkReg(0);

   FIFO#(Maybe#(Bit#(5))) returnList <- mkFIFO();

   rule removing ( state==Remove || state==RemoveOutput || state==RemoveFound );

      if(state!=RemoveFound)

         begin

            Tuple2#(Bit#(16),Bit#(5)) temp = rfile.sub(tempPic);

            if(tpl_1(temp)==tempNum)

               begin

                  state <= RemoveFound;

                  if(state==RemoveOutput)

                     returnList.enq(tagged Valid tpl_2(temp));

               end

            if(tempCount>=picCount)

               $display( "ERROR BufferControl: ShortTermPicList removing not found");

         end

      else

         begin

            Bit#(5) tempPrev = shortTermPicListPrev(tempPic);

            rfile.upd(tempPrev,rfile.sub(tempPic));

            if(tempCount==picCount)

               begin

                  picCount <= picCount-1;

                  nextPic <= tempPrev;

                  state <= Idle;

               end

         end

      tempCount <= tempCount+1;

      tempPic <= shortTermPicListNext(tempPic);

   endrule

   rule insertingGap ( state matches tagged InsertGap );

      if(tempCount>0)

         begin

            if(tempCount>1)

               rfile.upd(nextPic,tuple2(tempNum,31));

            else

               rfile.upd(nextPic,tuple2(tempNum,tempPic));

            nextPic <= shortTermPicListNext(nextPic);

         end

      else

         state <= Idle;

      Bit#(17) tempOne = 1;

      Bit#(17) maxPicNum = tempOne << log2_mfn;

      if(zeroExtend(tempNum) == maxPicNum-1)

         tempNum <= 0;

      else

         tempNum <= tempNum+1;

      tempCount <= tempCount-1;

   endrule

   rule searching ( state matches tagged Search );

      if(tempCount

         begin

            Tuple2#(Bit#(16),Bit#(5)) temp = rfile.sub(tempPic);

            if(tpl_1(temp)==tempNum)

               begin

                  returnList.enq(tagged Valid tpl_2(temp));

                  state <= Idle;

               end

            tempPic <= shortTermPicListPrev(tempPic);

            tempCount <= tempCount+1;

         end

      else

         $display( "ERROR BufferControl: ShortTermPicList searching not found");

   endrule

   rule listingAll ( state matches tagged ListAll );

      if(tempCount

         begin

            Tuple2#(Bit#(16),Bit#(5)) temp = rfile.sub(tempPic);

            returnList.enq(tagged Valid tpl_2(temp));

            tempPic <= shortTermPicListPrev(tempPic);

            tempCount <= tempCount+1;

         end

      else

         begin

            returnList.enq(tagged Invalid);

            state <= Idle;

         end

   endrule

   method Action clear() if(state matches tagged Idle);

      picCount <= 0;

      nextPic <= 0;

   endmethod

   method Action insert( Bit#(16) frameNum, Bit#(5) slot, Bit#(5) maxAllowed ) if(state matches tagged Idle);

      rfile.upd(nextPic,tuple2(frameNum,slot));

      nextPic <= shortTermPicListNext(nextPic);

      if(maxAllowed>picCount)

         picCount <= picCount+1;

   endmethod

   method Action insert_gap( Bit#(16) frameNum, Bit#(5) slot, Bit#(5) maxAllowed, Bit#(16) gap, Bit#(5) log2_max_frame_num ) if(state matches tagged Idle);

      state <= InsertGap;

      log2_mfn <= log2_max_frame_num;

      if(zeroExtend(picCount)+gap+1 >= zeroExtend(maxAllowed))

         picCount <= maxAllowed;

      else

         picCount <= truncate(zeroExtend(picCount)+gap+1);

      Bit#(5) temp;

      if(gap+1 >= zeroExtend(maxAllowed))

         temp = maxAllowed;

      else

         temp = truncate(gap+1);

      tempCount <= temp;

      Bit#(17) tempOne = 1;

      Bit#(17) maxPicNum = tempOne << log2_max_frame_num;

      Bit#(17) tempFrameNum = zeroExtend(frameNum);

      if(tempFrameNum+1 > zeroExtend(temp))

         tempNum <= truncate(tempFrameNum+1-zeroExtend(temp));

      else

         tempNum <= truncate(maxPicNum+tempFrameNum+1-zeroExtend(temp));

      tempPic <= slot;

   endmethod

   method Action remove( Bit#(16) frameNum, Bool removeOutputFlag ) if(state matches tagged Idle);

      if(removeOutputFlag)

         state <= RemoveOutput;

      else

         state <= Remove;

      tempCount <= 0;

      Bit#(5) temp = (maxRefFrames-picCount)+nextPic;

      if(temp>maxRefFrames-1)

         tempPic <= temp-maxRefFrames;

      else

         tempPic <= temp;

      tempNum <= frameNum;

   endmethod

   method Action search( Bit#(16) frameNum ) if(state matches tagged Idle);

      state <= Search;

      tempCount <= 0;

      tempPic <= shortTermPicListPrev(nextPic);

      tempNum <= frameNum;

   endmethod

   method Action listAll() if(state matches tagged Idle);

      state <= ListAll;

      tempCount <= 0;

      tempPic <= shortTermPicListPrev(nextPic);

   endmethod

   method Action deq();

      returnList.deq();

   endmethod

   method Maybe#(Bit#(5)) resultSlot();

      return returnList.first();

   endmethod

   method Bit#(5) numPics() if(state matches tagged Idle);

      return picCount;

   endmethod

endmodule

//-----------------------------------------------------------

// Long term pic list submodule

//-----------------------------------------------------------

typedef union tagged

{

 void     Idle;          //not working on anything in particular

 void     Clear;

 void     ListAll;

}

LongTermPicListState deriving(Eq,Bits);

interface LongTermPicList;

   method Action clear();

   method Action insert( Bit#(5) frameNum, Bit#(5) slot );

   method Action remove( Bit#(5) frameNum );

   method Action maxIndexPlus1( Bit#(5) maxAllowed );

   method Action search( Bit#(5) frameNum );

   method Action listAll();

   method Action deq();

   method Maybe#(Bit#(5)) resultSlot();

   method Bit#(5) numPics();

endinterface

module mkLongTermPicList( LongTermPicList );

//   RegFile#(Bit#(5),Maybe#(Bit#(5))) rfile <- mkRegFile(0,maxRefFrames-1);

   RFile1#(Bit#(5),Maybe#(Bit#(5))) rfile <- mkRFile1Full();

   Reg#(LongTermPicListState) state <- mkReg(Idle);

   Reg#(Bit#(5)) picCount <- mkReg(0);

   Reg#(Bit#(5)) tempPic  <- mkReg(0);

   FIFO#(Maybe#(Bit#(5))) returnList <- mkFIFO();

   rule clearing ( state matches tagged Clear );

      if(tempPic

         begin

            if(rfile.sub(tempPic) matches tagged Valid .data &&& picCount!=0)

               picCount <= picCount-1;

            rfile.upd(tempPic,Invalid);

            tempPic <= tempPic+1;

         end

      else

         state <= Idle;

      //$display( "TRACE BufferControl: LongTermPicList clearing %h %h", picCount, tempPic);

   endrule

   rule listingAll ( state matches tagged ListAll );

      if(tempPic

         begin

            Maybe#(Bit#(5)) temp = rfile.sub(tempPic);

            if(temp matches tagged Valid .data)

               returnList.enq(tagged Valid data);

            tempPic <= tempPic+1;

         end

      else

         begin

            returnList.enq(tagged Invalid);

            state <= Idle;

         end

      //$display( "TRACE BufferControl: LongTermPicList listingAll %h %h", picCount, tempPic);

   endrule

   method Action clear() if(state matches tagged Idle);

      state <= Clear;

      tempPic <= 0;

      //$display( "TRACE BufferControl: LongTermPicList clear %h", picCount);

   endmethod

   method Action insert( Bit#(5) frameNum, Bit#(5) slot ) if(state matches tagged Idle);

      if(rfile.sub(frameNum) matches tagged Invalid)

         picCount <= picCount+1;

      rfile.upd(frameNum,tagged Valid slot);

      //$display( "TRACE BufferControl: LongTermPicList insert %h %h %h", picCount, frameNum, slot);

   endmethod

   method Action remove( Bit#(5) frameNum ) if(state matches tagged Idle);

      if(rfile.sub(frameNum) matches tagged Invalid)

         $display( "ERROR BufferControl: LongTermPicList removing not found");

      else

         picCount <= picCount-1;

      rfile.upd(frameNum,Invalid);

      //$display( "TRACE BufferControl: LongTermPicList remove %h %h", picCount, frameNum);

   endmethod

   method Action maxIndexPlus1( Bit#(5) index ) if(state matches tagged Idle);

      state <= Clear;

      tempPic <= index;

      //$display( "TRACE BufferControl: LongTermPicList maxIndexPlus1 %h %h", picCount, index);

   endmethod

   method Action search( Bit#(5) frameNum ) if(state matches tagged Idle);

      returnList.enq(rfile.sub(frameNum));

      //$display( "TRACE BufferControl: LongTermPicList search %h %h", picCount, frameNum);

   endmethod

   method Action listAll() if(state matches tagged Idle);

      state <= ListAll;

      tempPic <= 0;

      //$display( "TRACE BufferControl: LongTermPicList listAll %h", picCount);

   endmethod

   method Action deq();

      returnList.deq();

      //$display( "TRACE BufferControl: LongTermPicList deq %h", picCount);

   endmethod

   method Maybe#(Bit#(5)) resultSlot();

      return returnList.first();

   endmethod

   method Bit#(5) numPics() if(state matches tagged Idle);

      return picCount;

   endmethod

endmodule

//-----------------------------------------------------------

// Free slot module

//-----------------------------------------------------------

interface FreeSlots;

   method Action  init();

   method Action  add( Bit#(5) slot );

   method Action  remove( Bit#(5) slot );

   method Bit#(5) first( Bit#(5) exception );

endinterface

module mkFreeSlots( FreeSlots );

   Reg#(Vector#(18,Bit#(1))) slots <- mkRegU();

   method Action  init();

      Vector#(18,Bit#(1)) tempSlots = replicate(0);

      slots <= tempSlots;

   endmethod

   method Action add( Bit#(5) slot );

      Vector#(18,Bit#(1)) tempSlots = slots;

      tempSlots[slot] = 0;

      slots <= tempSlots;

      if(slot >= maxRefFrames+2)

         $display( "ERROR BufferControl: FreeSlots add out of bounds");

   endmethod

   method Action remove( Bit#(5) slot );

      Vector#(18,Bit#(1)) tempSlots = slots;

      if(slot != 31)

         begin

            tempSlots[slot] = 1;

            slots <= tempSlots;

            if(slot >= maxRefFrames+2)

               $display( "ERROR BufferControl: FreeSlots remove out of bounds");

         end

   endmethod

   method Bit#(5) first( Bit#(5) exception );

      Bit#(5) tempout = 31;

      for(Integer ii=17; ii>=0; ii=ii-1)

         begin

            if(slots[fromInteger(ii)]==1'b0 && fromInteger(ii)!=exception)

               tempout = fromInteger(ii);

         end

      return tempout;

   endmethod

endmodule

//-----------------------------------------------------------

// Helper functions

//-----------------------------------------------------------

// Buffer Controller  Module

//-----------------------------------------------------------

(* synthesize *)

module mkBufferControl( IBufferControl );

   FIFO#(DeblockFilterOT) infifo  <- mkSizedFIFO(bufferControl_infifo_size);

   FIFO#(BufferControlOT) outfifo <- mkFIFO();

   FIFO#(FrameBufferLoadReq)  loadReqQ1  <- mkFIFO();

   FIFO#(FrameBufferLoadResp) loadRespQ1 <- mkFIFO();

   FIFO#(FrameBufferLoadReq)  loadReqQ2  <- mkFIFO();

   FIFO#(FrameBufferLoadResp) loadRespQ2 <- mkFIFO();

   FIFO#(FrameBufferStoreReq) storeReqQ  <- mkFIFO();

   FIFO#(InterpolatorLoadReq)  inLoadReqQ  <- mkFIFO();

   FIFO#(InterpolatorLoadResp) inLoadRespQ <- mkFIFO();

   FIFO#(Bit#(2)) inLoadOutOfBounds <- mkSizedFIFO(64);

   Reg#(Bit#(5)) log2_max_frame_num <- mkReg(0);

   Reg#(Bit#(5)) num_ref_frames <- mkReg(0);

   Reg#(Bit#(1)) gaps_in_frame_num_allowed_flag <- mkReg(0);

   Reg#(Bit#(PicWidthSz))  picWidth  <- mkReg(maxPicWidthInMB);

   Reg#(Bit#(PicHeightSz)) picHeight <- mkReg(0);

   Reg#(Bit#(PicAreaSz))   frameinmb <- mkReg(0);

   Reg#(Bit#(5))  ppsnum_ref_idx_l0_active <- mkReg(0);

   Reg#(Bit#(16)) frame_num <- mkReg(0);

   Reg#(Bit#(16)) prevRefFrameNum <- mkReg(0);

   Reg#(Bit#(5))  num_ref_idx_l0_active <- mkReg(0);

   Reg#(Bit#(2))  reordering_of_pic_nums_idc <- mkReg(0);

   Reg#(Bit#(16)) picNumLXPred <- mkReg(0);

   Reg#(Bit#(3))  memory_management_control_operation <- mkReg(0);

   Reg#(Bool) newInputFrame    <- mkReg(True);

   Reg#(Bool) noMoreInput      <- mkReg(False);

   Reg#(Bool) inputframedone   <- mkReg(False);

   Reg#(Outprocess) outprocess <- mkReg(Idle);

   Reg#(Bool) outputframedone  <- mkReg(True);

   Reg#(Bit#(5)) inSlot <- mkReg(0);

   Reg#(Bit#(FrameBufferSz)) inAddrBase <- mkReg(0);

   Reg#(Bit#(5)) outSlot <- mkReg(31);

   Reg#(Bit#(FrameBufferSz)) outAddrBase <- mkReg(0);

   Reg#(Bit#(TAdd#(PicAreaSz,7))) outReqCount <- mkReg(0);

   Reg#(Bit#(TAdd#(PicAreaSz,7))) outRespCount <- mkReg(0);

   FreeSlots freeSlots <- mkFreeSlots();//may include outSlot (have to make sure it's not used)

   ShortTermPicList shortTermPicList <- mkShortTermPicList();

   LongTermPicList  longTermPicList  <- mkLongTermPicList();

   RFile1#(Bit#(5),Bit#(5)) refPicList <- mkRFile1(0,maxRefFrames-1);

   Reg#(Bit#(5)) refPicListCount <- mkReg(0);

   Reg#(Bool) initRefPicList <- mkReg(False);

   Reg#(Bool) reorderRefPicList <- mkReg(False);

   Reg#(Bit#(5)) refIdx <- mkReg(0);

   Reg#(Bit#(5)) tempSlot <- mkReg(0);

   Reg#(Bit#(5)) tempSlot2 <- mkReg(0);

   Reg#(Bit#(2)) adjustFreeSlots <- mkReg(0);

   Reg#(Bool) refPicListDone <- mkReg(False);

   Reg#(Bool) lockInterLoads <- mkReg(True);

   DoNotFire donotfire <- mkDoNotFire();

   //-----------------------------------------------------------

   // Rules

   rule inputing ( !noMoreInput && !inputframedone );

      //$display( "Trace Buffer Control: passing infifo packed %h", pack(infifo.first()));

      case (infifo.first()) matches

         tagged EDOT .indata :

            begin

               case (indata) matches

                  tagged SPSlog2_max_frame_num .xdata :

                     begin

                        if(adjustFreeSlots == 0)

                           begin

                              infifo.deq();

                              log2_max_frame_num <= xdata;

                              freeSlots.init();

                              shortTermPicList.clear();

                              longTermPicList.clear();

                           end

                        else

                           donotfire.doNotFire();

                     end

                  tagged SPSnum_ref_frames .xdata :

                     begin

                        infifo.deq();

                        num_ref_frames <= xdata;

                     end

                  tagged SPSgaps_in_frame_num_allowed_flag .xdata :

                     begin

                        infifo.deq();

                        gaps_in_frame_num_allowed_flag <= xdata;

                     end

                  tagged SPSpic_width_in_mbs .xdata :

                     begin

                        infifo.deq();

                        picWidth <= xdata;

                     end

                  tagged SPSpic_height_in_map_units .xdata :

                     begin

                        infifo.deq();

                        picHeight <= xdata;

                        frameinmb <= zeroExtend(picWidth)*zeroExtend(xdata);

                     end

                  tagged PPSnum_ref_idx_l0_active .xdata :

                     begin

                        infifo.deq();

                        ppsnum_ref_idx_l0_active <= xdata;

                     end

                  tagged SHfirst_mb_in_slice .xdata :

                     begin

                        if(adjustFreeSlots == 0)

                           begin

                              infifo.deq();

                              newInputFrame <= False;

                              shortTermPicList.listAll();

                              longTermPicList.listAll();

                              initRefPicList <= True;

                              refPicListCount <= 0;

                              if(newInputFrame)

                                 begin

                                    inSlot <= freeSlots.first(outSlot);

                                    inAddrBase <= (zeroExtend(freeSlots.first(outSlot))*zeroExtend(frameinmb)*3)<<5;

                                 end

                              $display( "Trace BufferControl: passing SHfirst_mb_in_slice %h %h %0d", freeSlots.first(outSlot), outSlot, (newInputFrame ? 1 : 0));

                           end

                        else

                           donotfire.doNotFire();

                     end

                  tagged SHframe_num .xdata :

                     begin

                        infifo.deq();

                        frame_num <= xdata;

                        picNumLXPred <= frame_num;

                     end

                  tagged SHnum_ref_idx_active_override_flag .xdata :

                     begin

                        infifo.deq();

                        num_ref_idx_l0_active <= ppsnum_ref_idx_l0_active;

                     end

                  tagged SHnum_ref_idx_l0_active .xdata :

                     begin

                        infifo.deq();

                        num_ref_idx_l0_active <= xdata;

                     end

                  tagged SHRref_pic_list_reordering_flag_l0 .xdata :

                     begin

                        if(!initRefPicList)

                           begin

                              infifo.deq();

                              if(xdata==0)

                                 refPicListDone <= True;

                           end

                        else

                           donotfire.doNotFire();

                        refIdx <= 0;

                     end

                  tagged SHRreordering_of_pic_nums_idc .xdata :

                     begin

                        if(!reorderRefPicList)

                           begin

                              infifo.deq();

                              reordering_of_pic_nums_idc <= xdata;

                              if(xdata==3)

                                 refPicListDone <= True;

                           end

                        else

                           donotfire.doNotFire();

                     end

                  tagged SHRabs_diff_pic_num .xdata :

                     begin

                        if(!reorderRefPicList)

                           begin

                              infifo.deq();

                              Bit#(16) picNumLXNoWrap;

                              Bit#(17) tempOne = 1;

                              Bit#(17) maxPicNum = tempOne << log2_max_frame_num;

                              if(reordering_of_pic_nums_idc==0)

                                 begin

                                    if(picNumLXPred < truncate(xdata))

                                       picNumLXNoWrap = truncate(zeroExtend(picNumLXPred)-xdata+maxPicNum);

                                    else

                                       picNumLXNoWrap = truncate(zeroExtend(picNumLXPred)-xdata);

                                 end

                              else

                                 begin

                                    if(zeroExtend(picNumLXPred)+xdata >= maxPicNum)

                                       picNumLXNoWrap = truncate(zeroExtend(picNumLXPred)+xdata-maxPicNum);

                                    else

                                       picNumLXNoWrap = truncate(zeroExtend(picNumLXPred)+xdata);

                                 end

                              picNumLXPred <= picNumLXNoWrap;

                              shortTermPicList.search(picNumLXNoWrap);

                              reorderRefPicList <= True;

                              refPicListCount <= 0;

                           end

                        else

                           donotfire.doNotFire();

                     end

                  tagged SHRlong_term_pic_num .xdata :

                     begin

                        if(!reorderRefPicList)

                           begin

                              infifo.deq();

                              longTermPicList.search(xdata);

                              reorderRefPicList <= True;

                              refPicListCount <= 0;

                           end

                        else

                           donotfire.doNotFire();

                     end

                  tagged SHDlong_term_reference_flag .xdata :

                     begin

                        infifo.deq();

                        if(xdata==0)

                           shortTermPicList.insert(frame_num,inSlot,num_ref_frames);

                        else

                           longTermPicList.insert(0,inSlot);

                        adjustFreeSlots <= 1;

                     end

                  tagged SHDadaptive_ref_pic_marking_mode_flag .xdata :

                     begin

                        infifo.deq();

                        Bit#(17) tempFrameNum = zeroExtend(frame_num);

                        Bit#(17) tempOne = 1;

                        Bit#(17) maxPicNum = tempOne << log2_max_frame_num;

                        Bit#(16) tempGap = 0;

                        if(frame_num < prevRefFrameNum)

                           tempFrameNum = tempFrameNum + maxPicNum;

                        if(tempFrameNum-zeroExtend(prevRefFrameNum) > 1)

                           tempGap = truncate(tempFrameNum-zeroExtend(prevRefFrameNum)-1);

                        if(xdata==0)

                           begin

                              if(tempGap==0)

                                 shortTermPicList.insert(frame_num,inSlot,(num_ref_frames-longTermPicList.numPics()));

                              else

                                 shortTermPicList.insert_gap(frame_num,inSlot,(num_ref_frames-longTermPicList.numPics()),tempGap,log2_max_frame_num);

                              adjustFreeSlots <= 1;

                           end

                        prevRefFrameNum <= frame_num;

                     end

                  tagged SHDmemory_management_control_operation .xdata :

                     begin

                        infifo.deq();

                        memory_management_control_operation <= xdata;

                        if(xdata==0)

                           adjustFreeSlots <= 1;

                        else if(xdata==5)

                           begin

                              shortTermPicList.clear();

                              longTermPicList.clear();

                           end

                     end

                  tagged SHDdifference_of_pic_nums .xdata :

                     begin

                        infifo.deq();

                        Bit#(16) picNumXNoWrap;

                        Bit#(17) tempOne = 1;

                        Bit#(17) maxPicNum = tempOne << log2_max_frame_num;

                        if(frame_num < truncate(xdata))

                           picNumXNoWrap = truncate(zeroExtend(frame_num)-xdata+maxPicNum);

                        else

                           picNumXNoWrap = truncate(zeroExtend(frame_num)-xdata);

                        if(memory_management_control_operation == 1)

                           shortTermPicList.remove(picNumXNoWrap,False);

                        else

                           shortTermPicList.remove(picNumXNoWrap,True);

                     end

                  tagged SHDlong_term_pic_num .xdata :

                     begin

                        infifo.deq();

                        longTermPicList.remove(xdata);

                     end

                  tagged SHDlong_term_frame_idx .xdata :

                     begin

                        infifo.deq();

                        if(memory_management_control_operation == 3)

                           begin

                              if(shortTermPicList.resultSlot() matches tagged Valid .validdata)

                                 longTermPicList.insert(xdata,validdata);

                              else

                                 $display( "ERROR BufferControl: SHDlong_term_frame_idx Invalid output from shortTermPicList");

                              shortTermPicList.deq();

                           end

                        else

                           longTermPicList.insert(xdata,inSlot);

                     end

                  tagged SHDmax_long_term_frame_idx_plus1 .xdata :

                     begin

                        infifo.deq();

                        longTermPicList.maxIndexPlus1(xdata);

                     end

                  tagged EndOfFile :

                     begin

                        infifo.deq();

                        $display( "INFO Buffer Control: EndOfFile reached");

                        noMoreInput <= True;

                        //$finish(0);

                        //outfifo.enq(EndOfFile);

                     end

                  default:

                     begin

                       $display("WARNING: Why are we in this clause");

                       infifo.deq();

                     end

               endcase

            end

         tagged DFBLuma .indata :

            begin

               infifo.deq();

               //$display( "TRACE Buffer Control: input Luma %0d %h %h", indata.mb, indata.pixel, indata.data);

               Bit#(TAdd#(PicAreaSz,6)) addr = {(zeroExtend(indata.ver)*zeroExtend(picWidth)),2'b00}+zeroExtend(indata.hor);

               storeReqQ.enq(FBStoreReq {addr:inAddrBase+zeroExtend(addr),data:indata.data});

            end

         tagged DFBChroma .indata :

            begin

               infifo.deq();

               Bit#(TAdd#(PicAreaSz,4)) addr = {(zeroExtend(indata.ver)*zeroExtend(picWidth)),1'b0}+zeroExtend(indata.hor);

               Bit#(TAdd#(PicAreaSz,6)) chromaOffset = {frameinmb,6'b000000};

               Bit#(TAdd#(PicAreaSz,4)) vOffset = 0;

               if(indata.uv == 1)

                  vOffset = {frameinmb,4'b0000};

               storeReqQ.enq(FBStoreReq {addr:(inAddrBase+zeroExtend(chromaOffset)+zeroExtend(vOffset)+zeroExtend(addr)),data:indata.data});

               //$display( "TRACE Buffer Control: input Chroma %0d %0h %h %h %h %h", indata.uv, indata.ver, indata.hor, indata.data, addr, (inAddrBase+zeroExtend(chromaOffset)+zeroExtend(vOffset)+zeroExtend(addr)));

            end

         tagged EndOfFrame :

            begin

               infifo.deq();

               $display( "INFO Buffer Control: EndOfFrame reached");

               inputframedone <= True;

               newInputFrame <= True;

               refPicListDone <= False;

            end

         default: infifo.deq();

      endcase

   endrule

   rule initingRefPicList ( initRefPicList );

      if(shortTermPicList.resultSlot() matches tagged Valid .xdata)

         begin

            shortTermPicList.deq();

            refPicList.upd(refPicListCount,xdata);

            refPicListCount <= refPicListCount+1;

            $display( "Trace BufferControl: initingRefPicList shortTermPicList %h", xdata);

         end

      else if(longTermPicList.resultSlot() matches tagged Valid .xdata)

         begin

            longTermPicList.deq();

            refPicList.upd(refPicListCount,xdata);

            refPicListCount <= refPicListCount+1;

            $display( "Trace BufferControl: initingRefPicList longTermPicList %h", xdata);

         end

      else

         begin

            shortTermPicList.deq();

            longTermPicList.deq();

            initRefPicList <= False;

            refPicListCount <= 0;

            $display( "Trace BufferControl: initingRefPicList end");

         end

   endrule

   rule reorderingRefPicList ( reorderRefPicList );

      $display( "Trace BufferControl: reorderingRefPicList");

      if(shortTermPicList.resultSlot() matches tagged Valid .xdata)//////////////////////////////////////////////////////////////////////////////////////////

         begin

            shortTermPicList.deq();

            tempSlot <= refPicList.sub(refIdx);

            refPicList.upd(refIdx,xdata);

            refPicListCount <= refIdx+1;

            tempSlot2 <= xdata;

         end

      else if(longTermPicList.resultSlot() matches tagged Valid .xdata)/////////////////////////////////////////////////////////////////////////////////////may get stuck?

         begin

            longTermPicList.deq();

            tempSlot <= refPicList.sub(refIdx);

            refPicList.upd(refIdx,xdata);

            refPicListCount <= refIdx+1;

            tempSlot2 <= xdata;

         end

      else

         begin

            if(refPicListCount

               begin

                  tempSlot <= refPicList.sub(refPicListCount);

                  refPicList.upd(refPicListCount,tempSlot);

                  refPicListCount <= refPicListCount+1;

               end

            else

               begin

                  reorderRefPicList <= False;

                  refPicListCount <= 0;

                  refIdx <= refIdx+1;

               end

         end

   endrule

   rule adjustingFreeSlots ( adjustFreeSlots != 0 );

      if(adjustFreeSlots == 1)

         begin

            shortTermPicList.listAll();

            longTermPicList.listAll();

            freeSlots.init();

            adjustFreeSlots <= 2;

            $display( "Trace BufferControl: adjustingFreeSlots begin");

         end

      else

         begin

            if(shortTermPicList.resultSlot() matches tagged Valid .xdata)

               begin

                  shortTermPicList.deq();

                  freeSlots.remove(xdata);

                  $display( "Trace BufferControl: adjustingFreeSlots shortTermPicList %h", xdata);

               end

            else if(longTermPicList.resultSlot() matches tagged Valid .xdata)

               begin

                  longTermPicList.deq();

                  freeSlots.remove(xdata);

                  $display( "Trace BufferControl: adjustingFreeSlots longTermPicList %h", xdata);

               end

            else

               begin

                  shortTermPicList.deq();

                  longTermPicList.deq();

                  adjustFreeSlots <= 0;

                  $display( "Trace BufferControl: adjustingFreeSlots end");

               end

         end

   endrule

   rule outputingReq ( outprocess != Idle );

      if(outprocess==Y)

         begin

            loadReqQ1.enq(FBLoadReq (outAddrBase+zeroExtend(outReqCount)));

            if(outReqCount == {1'b0,frameinmb,6'b000000}-1)

               outprocess <= U;

            outReqCount <= outReqCount+1;

         end

      else if(outprocess==U)

         begin

            loadReqQ1.enq(FBLoadReq (outAddrBase+zeroExtend(outReqCount)));

            if(outReqCount == {1'b0,frameinmb,6'b000000}+{3'b000,frameinmb,4'b0000}-1)

               outprocess <= V;

            outReqCount <= outReqCount+1;

         end

      else

         begin

            //$display( "TRACE BufferControl: outputingReq V %h %h %h", outAddrBase, outReqCount, (outAddrBase+zeroExtend(outReqCount)));

            loadReqQ1.enq(FBLoadReq (outAddrBase+zeroExtend(outReqCount)));

            if(outReqCount == {1'b0,frameinmb,6'b000000}+{2'b00,frameinmb,5'b00000}-1)

               outprocess <= Idle;

            outReqCount <= outReqCount+1;

         end

   endrule

   rule outputingResp ( !outputframedone );

      if(loadRespQ1.first() matches tagged FBLoadResp .xdata)

         begin

            loadRespQ1.deq();

            outfifo.enq(tagged YUV xdata);

            if(outRespCount == {1'b0,frameinmb,6'b000000}+{2'b00,frameinmb,5'b00000}-1)

               outputframedone <= True;

            outRespCount <= outRespCount+1;

         end

   endrule

   rule goToNextFrame ( outputframedone && inputframedone && inLoadReqQ.first()==IPLoadEndFrame );

      inputframedone <= False;

      outprocess <= Y;

      outputframedone <= False;

      outSlot <= inSlot;

      outAddrBase <= inAddrBase;

      outReqCount <= 0;

      outRespCount <= 0;

      loadReqQ1.enq(FBEndFrameSync);

      loadReqQ2.enq(FBEndFrameSync);

      storeReqQ.enq(FBEndFrameSync);

      inLoadReqQ.deq();

      lockInterLoads <= True;

   endrule

   rule unlockInterLoads ( lockInterLoads && refPicListDone );

      lockInterLoads <= False;

   endrule

   rule theEndOfFile ( outputframedone && noMoreInput );