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[/] [bluespec-h264/] [trunk/] [src/] [ExpGolomb.bsv] - Blame information for rev 27

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Line No. Rev Author Line
1 2 jamey.hick 
//**********************************************************************
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// Exp-Golomb codes
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//----------------------------------------------------------------------
4 27 jamey.hick 
//
5 2 jamey.hick 
//
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//
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package ExpGolomb;
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import H264Types::*;
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   //-----------------------------------------------------------
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   // Helper functions
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   (* noinline *)
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   function Bufcount expgolomb_numbits32( Buffer inbuffer );//number of bits consumed by exp-golomb code
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      Bufcount tempout = 100;
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      for(Integer ii=33; ii>0; ii=ii-1)
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         begin
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            if(inbuffer[buffersize-fromInteger(ii)]==1'b1)
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               tempout = fromInteger(ii);
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         end
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      return tempout;
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   endfunction
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   (* noinline *)
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   function Bit#(33) expgolomb_codenum32( Buffer inbuffer, Bufcount egnumbits );//exp-golomb codenum calculation
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      Bit#(33) tempbuffer = inbuffer[buffersize-1:buffersize-33];
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      Bufcount shiftamount = 33-egnumbits;
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      return (tempbuffer >> zeroExtend(shiftamount))-1;
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   endfunction
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   (* noinline *)
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   function Bit#(32) expgolomb_unsigned32( Buffer inbuffer, Bufcount egnumbits );//unsigned exp-golomb code calculation
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      Bit#(33) codenum = expgolomb_codenum32( inbuffer, egnumbits );
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      return truncate(codenum);
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   endfunction
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   (* noinline *)
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   function Bit#(32) expgolomb_signed32( Buffer inbuffer, Bufcount egnumbits );//signed exp-golomb code calculation
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      Bit#(33) codenum = expgolomb_codenum32( inbuffer, egnumbits );
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      Bit#(33) tempout = (codenum+1) >> 1;
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      Bit#(33) tempout2 = (codenum[0]==1 ? tempout : (~tempout)+1 );
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      return truncate(tempout2);
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   endfunction
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   (* noinline *)
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   function Bufcount expgolomb_numbits( Buffer inbuffer );//number of bits consumed by exp-golomb code
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      Bufcount tempout = 100;
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      for(Integer ii=17; ii>0; ii=ii-1)
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         begin
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            if(inbuffer[buffersize-fromInteger(ii)]==1'b1)
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               tempout = (fromInteger(ii)*2)-1;
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         end
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      return tempout;
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   endfunction
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   (* noinline *)
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   function Bit#(17) expgolomb_codenum( Buffer inbuffer );//exp-golomb codenum calculation
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      Bufcount egnumbits = expgolomb_numbits( inbuffer ) >> 1;
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      Bit#(33) tempbuffer = inbuffer[buffersize-1:buffersize-33] << zeroExtend(egnumbits);
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      Bit#(17) tempout = tempbuffer[32:16];
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      Bufcount shiftamount = 17-egnumbits-1;
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      return (tempout >> zeroExtend(shiftamount))-1;
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   endfunction
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   (* noinline *)
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   function Bit#(16) expgolomb_unsigned( Buffer inbuffer );//unsigned exp-golomb code calculation
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      Bit#(17) codenum = expgolomb_codenum( inbuffer );
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      return truncate(codenum);
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   endfunction
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   (* noinline *)
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   function Bit#(16) expgolomb_signed( Buffer inbuffer );//signed exp-golomb code calculation
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      Bit#(17) codenum = expgolomb_codenum( inbuffer );
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      Bit#(17) tempout = (codenum+1) >> 1;
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      Bit#(17) tempout2 = (codenum[0]==1 ? tempout : (~tempout)+1 );
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      return truncate(tempout2);
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   endfunction
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   (* noinline *)
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   function Bit#(6) expgolomb_coded_block_pattern( Buffer inbuffer, MbType mbtype );//unsigned exp-golomb code calculation
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      Bit#(6) codenum = truncate(expgolomb_codenum( inbuffer ));
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      if(mbPartPredMode(mbtype,0) == Intra_4x4)
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         begin
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            case(codenum)
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               0: return 47;
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               1: return 31;
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               2: return 15;
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               3: return 0;
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               4: return 23;
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               5: return 27;
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               6: return 29;
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               7: return 30;
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               8: return 7;
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               9: return 11;
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               10: return 13;
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               11: return 14;
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               12: return 39;
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               13: return 43;
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               14: return 45;
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               15: return 46;
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               16: return 16;
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               17: return 3;
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               18: return 5;
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               19: return 10;
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               20: return 12;
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               21: return 19;
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               22: return 21;
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               23: return 26;
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               24: return 28;
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               25: return 35;
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               26: return 37;
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               27: return 42;
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               28: return 44;
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               29: return 1;
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               30: return 2;
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               31: return 4;
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               32: return 8;
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               33: return 17;
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               34: return 18;
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               35: return 20;
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               36: return 24;
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               37: return 6;
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               38: return 9;
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               39: return 22;
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               40: return 25;
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               41: return 32;
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               42: return 33;
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               43: return 34;
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               44: return 36;
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               45: return 40;
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               46: return 38;
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               47: return 41;
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            endcase
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         end
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      else
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         begin
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            case(codenum)
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               0: return 0;
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               1: return 16;
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               2: return 1;
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               3: return 2;
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               4: return 4;
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               5: return 8;
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               6: return 32;
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               7: return 3;
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               8: return 5;
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               9: return 10;
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               10: return 12;
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               11: return 15;
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               12: return 47;
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               13: return 7;
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               14: return 11;
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               15: return 13;
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               16: return 14;
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               17: return 6;
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               18: return 9;
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               19: return 31;
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               20: return 35;
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               21: return 37;
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               22: return 42;
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               23: return 44;
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               24: return 33;
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               25: return 34;
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               26: return 36;
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               27: return 40;
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               28: return 39;
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               29: return 43;
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               30: return 45;
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               31: return 46;
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               32: return 17;
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               33: return 18;
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               34: return 20;
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               35: return 24;
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               36: return 19;
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               37: return 21;
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               38: return 26;
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               39: return 28;
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               40: return 23;
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               41: return 27;
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               42: return 29;
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               43: return 30;
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               44: return 22;
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               45: return 25;
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               46: return 38;
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               47: return 41;
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            endcase
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         end
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   endfunction
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endpackage

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