1 // Copyright 2011 Google Inc. All Rights Reserved. 2 // 3 // Use of this source code is governed by a BSD-style license 4 // that can be found in the COPYING file in the root of the source 5 // tree. An additional intellectual property rights grant can be found 6 // in the file PATENTS. All contributing project authors may 7 // be found in the AUTHORS file in the root of the source tree. 8 // ----------------------------------------------------------------------------- 9 // 10 // Cost tables for level and modes. 11 // 12 // Author: Skal (pascal.massimino (at) gmail.com) 13 14 #ifndef WEBP_ENC_COST_H_ 15 #define WEBP_ENC_COST_H_ 16 17 #include "./vp8enci.h" 18 19 #if defined(__cplusplus) || defined(c_plusplus) 20 extern "C" { 21 #endif 22 23 // approximate cost per level: 24 extern const uint16_t VP8LevelFixedCosts[MAX_LEVEL + 1]; 25 extern const uint16_t VP8EntropyCost[256]; // 8bit fixed-point log(p) 26 27 // Cost of coding one event with probability 'proba'. 28 static WEBP_INLINE int VP8BitCost(int bit, uint8_t proba) { 29 return !bit ? VP8EntropyCost[proba] : VP8EntropyCost[255 - proba]; 30 } 31 32 // Level cost calculations 33 extern const uint16_t VP8LevelCodes[MAX_VARIABLE_LEVEL][2]; 34 void VP8CalculateLevelCosts(VP8Proba* const proba); 35 static WEBP_INLINE int VP8LevelCost(const uint16_t* const table, int level) { 36 return VP8LevelFixedCosts[level] 37 + table[(level > MAX_VARIABLE_LEVEL) ? MAX_VARIABLE_LEVEL : level]; 38 } 39 40 // Mode costs 41 extern const uint16_t VP8FixedCostsUV[4]; 42 extern const uint16_t VP8FixedCostsI16[4]; 43 extern const uint16_t VP8FixedCostsI4[NUM_BMODES][NUM_BMODES][NUM_BMODES]; 44 45 //------------------------------------------------------------------------------ 46 47 #if defined(__cplusplus) || defined(c_plusplus) 48 } // extern "C" 49 #endif 50 51 #endif /* WEBP_ENC_COST_H_ */ 52
