1 // Copyright 2011 Google Inc. All Rights Reserved.
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 // -----------------------------------------------------------------------------
10 // Cost tables for level and modes.
12 // Author: Skal (pascal.massimino@gmail.com)
14 #ifndef WEBP_ENC_COST_H_
15 #define WEBP_ENC_COST_H_
19 #include "./vp8enci.h"
25 // On-the-fly info about the current set of residuals. Handy to avoid
26 // passing zillions of params.
30 const int16_t* coeffs;
38 void VP8InitResidual(int first, int coeff_type,
39 VP8Encoder* const enc, VP8Residual* const res);
41 typedef void (*VP8SetResidualCoeffsFunc)(const int16_t* const coeffs,
42 VP8Residual* const res);
43 extern VP8SetResidualCoeffsFunc VP8SetResidualCoeffs;
45 void VP8SetResidualCoeffsInit(void); // must be called first
47 int VP8RecordCoeffs(int ctx, const VP8Residual* const res);
49 // approximate cost per level:
50 extern const uint16_t VP8LevelFixedCosts[MAX_LEVEL + 1];
51 extern const uint16_t VP8EntropyCost[256]; // 8bit fixed-point log(p)
53 // Cost of coding one event with probability 'proba'.
54 static WEBP_INLINE int VP8BitCost(int bit, uint8_t proba) {
55 return !bit ? VP8EntropyCost[proba] : VP8EntropyCost[255 - proba];
58 // Cost calculation function.
59 typedef int (*VP8GetResidualCostFunc)(int ctx0, const VP8Residual* const res);
60 extern VP8GetResidualCostFunc VP8GetResidualCost;
62 void VP8GetResidualCostInit(void); // must be called first
64 // Level cost calculations
65 extern const uint16_t VP8LevelCodes[MAX_VARIABLE_LEVEL][2];
66 void VP8CalculateLevelCosts(VP8Proba* const proba);
67 static 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];
73 extern const uint16_t VP8FixedCostsUV[4];
74 extern const uint16_t VP8FixedCostsI16[4];
75 extern const uint16_t VP8FixedCostsI4[NUM_BMODES][NUM_BMODES][NUM_BMODES];
77 //------------------------------------------------------------------------------
83 #endif /* WEBP_ENC_COST_H_ */