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 <assert.h> 18 #include <stdlib.h> 19 #include "./vp8enci.h" 20 21 #ifdef __cplusplus 22 extern "C" { 23 #endif 24 25 // On-the-fly info about the current set of residuals. Handy to avoid 26 // passing zillions of params. 27 typedef struct VP8Residual VP8Residual; 28 struct VP8Residual { 29 int first; 30 int last; 31 const int16_t* coeffs; 32 33 int coeff_type; 34 ProbaArray* prob; 35 StatsArray* stats; 36 CostArrayPtr costs; 37 }; 38 39 void VP8InitResidual(int first, int coeff_type, 40 VP8Encoder* const enc, VP8Residual* const res); 41 42 int VP8RecordCoeffs(int ctx, const VP8Residual* const res); 43 44 // Cost of coding one event with probability 'proba'. 45 static WEBP_INLINE int VP8BitCost(int bit, uint8_t proba) { 46 return !bit ? VP8EntropyCost[proba] : VP8EntropyCost[255 - proba]; 47 } 48 49 // Level cost calculations 50 extern const uint16_t VP8LevelCodes[MAX_VARIABLE_LEVEL][2]; 51 void VP8CalculateLevelCosts(VP8EncProba* const proba); 52 static WEBP_INLINE int VP8LevelCost(const uint16_t* const table, int level) { 53 return VP8LevelFixedCosts[level] 54 + table[(level > MAX_VARIABLE_LEVEL) ? MAX_VARIABLE_LEVEL : level]; 55 } 56 57 // Mode costs 58 extern const uint16_t VP8FixedCostsUV[4]; 59 extern const uint16_t VP8FixedCostsI16[4]; 60 extern const uint16_t VP8FixedCostsI4[NUM_BMODES][NUM_BMODES][NUM_BMODES]; 61 62 //------------------------------------------------------------------------------ 63 64 #ifdef __cplusplus 65 } // extern "C" 66 #endif 67 68 #endif /* WEBP_ENC_COST_H_ */ 69
