1 // Copyright 2011 Google Inc. All Rights Reserved. 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 WEBP_INLINE int VP8BitCost(int bit, uint8_t proba) { 26 return !bit ? VP8EntropyCost[proba] : VP8EntropyCost[255 - proba]; 27 } 28 29 // Level cost calculations 30 extern const uint16_t VP8LevelCodes[MAX_VARIABLE_LEVEL][2]; 31 void VP8CalculateLevelCosts(VP8Proba* const proba); 32 static WEBP_INLINE int VP8LevelCost(const uint16_t* const table, int level) { 33 return VP8LevelFixedCosts[level] 34 + table[(level > MAX_VARIABLE_LEVEL) ? MAX_VARIABLE_LEVEL : level]; 35 } 36 37 // Mode costs 38 extern const uint16_t VP8FixedCostsUV[4]; 39 extern const uint16_t VP8FixedCostsI16[4]; 40 extern const uint16_t VP8FixedCostsI4[NUM_BMODES][NUM_BMODES][NUM_BMODES]; 41 42 //------------------------------------------------------------------------------ 43 44 #if defined(__cplusplus) || defined(c_plusplus) 45 } // extern "C" 46 #endif 47 48 #endif /* WEBP_ENC_COST_H_ */ 49
