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