1 // Compress/RangeCoder/RangeCoderOpt.h

     2 

     3 #ifndef __COMPRESS_RANGECODER_OPT_H

     4 #define __COMPRESS_RANGECODER_OPT_H

     5 

     6 #define RC_INIT_VAR \

     7   UInt32 range = rangeDecoder->Range; \

     8   UInt32 code = rangeDecoder->Code;        

     9 

    10 #define RC_FLUSH_VAR \

    11   rangeDecoder->Range = range; \

    12   rangeDecoder->Code = code;

    13 

    14 #define RC_NORMALIZE \

    15   if (range < NCompress::NRangeCoder::kTopValue) \

    16     { code = (code << 8) | rangeDecoder->Stream.ReadByte(); range <<= 8; }

    17 

    18 #define RC_GETBIT2(numMoveBits, prob, mi, A0, A1) \

    19   { UInt32 bound = (range >> NCompress::NRangeCoder::kNumBitModelTotalBits) * prob; \

    20   if (code < bound) \

    21   { A0; range = bound; \

    22     prob += (NCompress::NRangeCoder::kBitModelTotal - prob) >> numMoveBits; \

    23     mi <<= 1; } \

    24   else \

    25   { A1; range -= bound; code -= bound; prob -= (prob) >> numMoveBits; \

    26     mi = (mi + mi) + 1; }} \

    27   RC_NORMALIZE

    28 

    29 #define RC_GETBIT(numMoveBits, prob, mi) RC_GETBIT2(numMoveBits, prob, mi, ; , ;)

    30 

    31 #endif