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92 lines
2.0 KiB
92 lines
2.0 KiB
/////////////////////////////////////////////////////////////////////////////// |
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// |
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/// \file price.h |
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/// \brief Probability price calculation |
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// |
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// Author: Igor Pavlov |
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// |
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// This file has been put into the public domain. |
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// You can do whatever you want with this file. |
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// |
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/////////////////////////////////////////////////////////////////////////////// |
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#ifndef LZMA_PRICE_H |
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#define LZMA_PRICE_H |
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#define RC_MOVE_REDUCING_BITS 4 |
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#define RC_BIT_PRICE_SHIFT_BITS 4 |
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#define RC_PRICE_TABLE_SIZE (RC_BIT_MODEL_TOTAL >> RC_MOVE_REDUCING_BITS) |
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#define RC_INFINITY_PRICE (UINT32_C(1) << 30) |
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/// Lookup table for the inline functions defined in this file. |
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extern const uint8_t lzma_rc_prices[RC_PRICE_TABLE_SIZE]; |
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static inline uint32_t |
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rc_bit_price(const probability prob, const uint32_t bit) |
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{ |
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return lzma_rc_prices[(prob ^ ((UINT32_C(0) - bit) |
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& (RC_BIT_MODEL_TOTAL - 1))) >> RC_MOVE_REDUCING_BITS]; |
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} |
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static inline uint32_t |
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rc_bit_0_price(const probability prob) |
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{ |
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return lzma_rc_prices[prob >> RC_MOVE_REDUCING_BITS]; |
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} |
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static inline uint32_t |
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rc_bit_1_price(const probability prob) |
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{ |
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return lzma_rc_prices[(prob ^ (RC_BIT_MODEL_TOTAL - 1)) |
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>> RC_MOVE_REDUCING_BITS]; |
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} |
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static inline uint32_t |
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rc_bittree_price(const probability *const probs, |
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const uint32_t bit_levels, uint32_t symbol) |
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{ |
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uint32_t price = 0; |
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symbol += UINT32_C(1) << bit_levels; |
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do { |
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const uint32_t bit = symbol & 1; |
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symbol >>= 1; |
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price += rc_bit_price(probs[symbol], bit); |
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} while (symbol != 1); |
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return price; |
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} |
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static inline uint32_t |
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rc_bittree_reverse_price(const probability *const probs, |
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uint32_t bit_levels, uint32_t symbol) |
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{ |
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uint32_t price = 0; |
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uint32_t model_index = 1; |
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do { |
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const uint32_t bit = symbol & 1; |
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symbol >>= 1; |
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price += rc_bit_price(probs[model_index], bit); |
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model_index = (model_index << 1) + bit; |
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} while (--bit_levels != 0); |
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return price; |
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} |
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static inline uint32_t |
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rc_direct_price(const uint32_t bits) |
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{ |
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return bits << RC_BIT_PRICE_SHIFT_BITS; |
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} |
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#endif
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