?? aribitcoder.h
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// Compression/AriBitCoder.h#ifndef __COMPRESSION_BITCODER_H#define __COMPRESSION_BITCODER_H#include "Types.h"#include "RangeCoder.h"const int kNumBitModelTotalBits = 11;const UINT16 kBitModelTotal = (1 << kNumBitModelTotalBits);/////////////////////////////// CBitModelconst int kNumMoveBits = 5;class CBitModel{public: UINT32 m_Probability; void UpdateModel(UINT32 symbol) { /* m_Probability -= (m_Probability + ((symbol - 1) & ((1 << numMoveBits) - 1))) >> numMoveBits; m_Probability += (1 - symbol) << (kNumBitModelTotalBits - numMoveBits); */ if (symbol == 0) m_Probability += (kBitModelTotal - m_Probability) >> kNumMoveBits; else m_Probability -= (m_Probability) >> kNumMoveBits; }public: void Init() { m_Probability = kBitModelTotal / 2; }};class CBitDecoder: public CBitModel{public: UINT32 Decode(CRangeDecoder *rangeDecoder) { UINT32 newBound = (rangeDecoder->m_Range >> kNumBitModelTotalBits) * m_Probability; if (rangeDecoder->m_Code < newBound) { rangeDecoder->m_Range = newBound; m_Probability += (kBitModelTotal - m_Probability) >> kNumMoveBits; if (rangeDecoder->m_Range < kTopValue) { rangeDecoder->m_Code = (rangeDecoder->m_Code << 8) | rangeDecoder->m_Stream.ReadByte(); rangeDecoder->m_Range <<= 8; } return 0; } else { rangeDecoder->m_Range -= newBound; rangeDecoder->m_Code -= newBound; m_Probability -= (m_Probability) >> kNumMoveBits; if (rangeDecoder->m_Range < kTopValue) { rangeDecoder->m_Code = (rangeDecoder->m_Code << 8) | rangeDecoder->m_Stream.ReadByte(); rangeDecoder->m_Range <<= 8; } return 1; } }};#endif?? 快捷鍵說明
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