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@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 22extern "C" { 23#endif 24 25// On-the-fly info about the current set of residuals. Handy to avoid 26// passing zillions of params. 27typedef struct { 28 int first; 29 int last; 30 const int16_t* coeffs; 31 32 int coeff_type; 33 ProbaArray* prob; 34 StatsArray* stats; 35 CostArray* cost; 36} VP8Residual; 37 38void VP8InitResidual(int first, int coeff_type, 39 VP8Encoder* const enc, VP8Residual* const res); 40 41typedef void (*VP8SetResidualCoeffsFunc)(const int16_t* const coeffs, 42 VP8Residual* const res); 43extern VP8SetResidualCoeffsFunc VP8SetResidualCoeffs; 44 45extern void VP8SetResidualCoeffsInit(void); // must be called first 46 47int VP8RecordCoeffs(int ctx, const VP8Residual* const res); 48 49// approximate cost per level: 50extern const uint16_t VP8LevelFixedCosts[MAX_LEVEL + 1]; 51extern const uint16_t VP8EntropyCost[256]; // 8bit fixed-point log(p) 52 53// Cost of coding one event with probability 'proba'. 54static WEBP_INLINE int VP8BitCost(int bit, uint8_t proba) { 55 return !bit ? VP8EntropyCost[proba] : VP8EntropyCost[255 - proba]; 56} 57 58// Cost calculation function. 59typedef int (*VP8GetResidualCostFunc)(int ctx0, const VP8Residual* const res); 60extern VP8GetResidualCostFunc VP8GetResidualCost; 61 62extern void VP8GetResidualCostInit(void); // must be called first 63 64// Level cost calculations 65extern const uint16_t VP8LevelCodes[MAX_VARIABLE_LEVEL][2]; 66void VP8CalculateLevelCosts(VP8Proba* const proba); 67static WEBP_INLINE int VP8LevelCost(const uint16_t* const table, int level) { 68 return VP8LevelFixedCosts[level] 69 + table[(level > MAX_VARIABLE_LEVEL) ? MAX_VARIABLE_LEVEL : level]; 70} 71 72// Mode costs 73extern const uint16_t VP8FixedCostsUV[4]; 74extern const uint16_t VP8FixedCostsI16[4]; 75extern const uint16_t VP8FixedCostsI4[NUM_BMODES][NUM_BMODES][NUM_BMODES]; 76 77//------------------------------------------------------------------------------ 78 79#ifdef __cplusplus 80} // extern "C" 81#endif 82 83#endif /* WEBP_ENC_COST_H_ */ 84