1 // Copyright 2011 Google Inc. 2 // 3 // This code is licensed under the same terms as WebM: 4 // Software License Agreement: http://www.webmproject.org/license/software/ 5 // Additional IP Rights Grant: http://www.webmproject.org/license/additional/ 6 // ----------------------------------------------------------------------------- 7 // 8 // Cost tables for level and modes. 9 // 10 // Author: Skal (pascal.massimino (at) gmail.com) 11 12 #ifndef WEBP_ENC_COST_H_ 13 #define WEBP_ENC_COST_H_ 14 15 #include "vp8enci.h" 16 17 #if defined(__cplusplus) || defined(c_plusplus) 18 extern "C" { 19 #endif 20 21 extern const uint16_t VP8LevelFixedCosts[2048]; // approximate cost per level 22 extern const uint16_t VP8EntropyCost[256]; // 8bit fixed-point log(p) 23 24 // Cost of coding one event with probability 'proba'. 25 static inline int VP8BitCost(int bit, uint8_t proba) { 26 return !bit ? VP8EntropyCost[proba] : VP8EntropyCost[255 - proba]; 27 } 28 29 // Cost of coding 'nb' 1's and 'total-nb' 0's using 'proba' probability. 30 static inline uint64_t VP8BranchCost(uint64_t nb, uint64_t total, 31 uint8_t proba) { 32 return nb * VP8BitCost(1, proba) + (total - nb) * VP8BitCost(0, proba); 33 } 34 35 // Level cost calculations 36 extern const uint16_t VP8LevelCodes[MAX_VARIABLE_LEVEL][2]; 37 void VP8CalculateLevelCosts(VP8Proba* const proba); 38 static inline int VP8LevelCost(const uint16_t* const table, int level) { 39 return VP8LevelFixedCosts[level] 40 + table[level > MAX_VARIABLE_LEVEL ? MAX_VARIABLE_LEVEL : level]; 41 } 42 43 // Mode costs 44 extern const uint16_t VP8FixedCostsUV[4]; 45 extern const uint16_t VP8FixedCostsI16[4]; 46 extern const uint16_t VP8FixedCostsI4[NUM_BMODES][NUM_BMODES][NUM_BMODES]; 47 48 //----------------------------------------------------------------------------- 49 50 #if defined(__cplusplus) || defined(c_plusplus) 51 } // extern "C" 52 #endif 53 54 #endif // WEBP_ENC_COST_H_ 55
