hostTools/lzma/compress/RCDefs.h


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42

#ifndef __RCDEFS_H
#define __RCDEFS_H

#include "AriBitCoder.h"
#include "AriConst.h"

#define RC_INIT_VAR                            \
  UINT32 aRange = aRangeDecoder->m_Range;      \
  UINT32 aCode = aRangeDecoder->m_Code;        

#define RC_FLUSH_VAR                          \
  aRangeDecoder->m_Range = aRange;            \
  aRangeDecoder->m_Code = aCode;

#define RC_NORMALIZE                                    \
    if (aRange < NCompression::NArithmetic::kTopValue)               \
    {                                                              \
      aCode = (aCode << 8) | aRangeDecoder->m_Stream.ReadByte();   \
      aRange <<= 8; }

#define RC_GETBIT2(aNumMoveBits, aProb, aModelIndex, Action0, Action1)                        \
    {UINT32 aNewBound = (aRange >> NCompression::NArithmetic::kNumBitModelTotalBits) * aProb; \
    if (aCode < aNewBound)                               \
    {                                                             \
      Action0;                                                    \
      aRange = aNewBound;                                         \
      aProb += (NCompression::NArithmetic::kBitModelTotal - aProb) >> aNumMoveBits;          \
      aModelIndex <<= 1;                                          \
    }                                                             \
    else                                                          \
    {                                                             \
      Action1;                                                    \
      aRange -= aNewBound;                                        \
      aCode -= aNewBound;                                          \
      aProb -= (aProb) >> aNumMoveBits;                           \
      aModelIndex = (aModelIndex << 1) + 1;                       \
    }}                                                             \
    RC_NORMALIZE

#define RC_GETBIT(aNumMoveBits, aProb, aModelIndex) RC_GETBIT2(aNumMoveBits, aProb, aModelIndex, ; , ;)               

#endif