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
32