| // Copyright 2011 Google Inc. All Rights Reserved. |
| // |
| // Use of this source code is governed by a BSD-style license |
| // that can be found in the COPYING file in the root of the source |
| // tree. An additional intellectual property rights grant can be found |
| // in the file PATENTS. All contributing project authors may |
| // be found in the AUTHORS file in the root of the source tree. |
| // ----------------------------------------------------------------------------- |
| // |
| // Cost tables for level and modes. |
| // |
| // Author: Skal (pascal.massimino@gmail.com) |
| |
| #ifndef WEBP_ENC_COST_H_ |
| #define WEBP_ENC_COST_H_ |
| |
| #include <assert.h> |
| #include <stdlib.h> |
| #include "./vp8enci.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| // On-the-fly info about the current set of residuals. Handy to avoid |
| // passing zillions of params. |
| typedef struct { |
| int first; |
| int last; |
| const int16_t* coeffs; |
| |
| int coeff_type; |
| ProbaArray* prob; |
| StatsArray* stats; |
| CostArray* cost; |
| } VP8Residual; |
| |
| void VP8InitResidual(int first, int coeff_type, |
| VP8Encoder* const enc, VP8Residual* const res); |
| |
| typedef void (*VP8SetResidualCoeffsFunc)(const int16_t* const coeffs, |
| VP8Residual* const res); |
| extern VP8SetResidualCoeffsFunc VP8SetResidualCoeffs; |
| |
| extern void VP8SetResidualCoeffsInit(void); // must be called first |
| |
| int VP8RecordCoeffs(int ctx, const VP8Residual* const res); |
| |
| // approximate cost per level: |
| extern const uint16_t VP8LevelFixedCosts[MAX_LEVEL + 1]; |
| extern const uint16_t VP8EntropyCost[256]; // 8bit fixed-point log(p) |
| |
| // Cost of coding one event with probability 'proba'. |
| static WEBP_INLINE int VP8BitCost(int bit, uint8_t proba) { |
| return !bit ? VP8EntropyCost[proba] : VP8EntropyCost[255 - proba]; |
| } |
| |
| // Cost calculation function. |
| typedef int (*VP8GetResidualCostFunc)(int ctx0, const VP8Residual* const res); |
| extern VP8GetResidualCostFunc VP8GetResidualCost; |
| |
| extern void VP8GetResidualCostInit(void); // must be called first |
| |
| // Level cost calculations |
| extern const uint16_t VP8LevelCodes[MAX_VARIABLE_LEVEL][2]; |
| void VP8CalculateLevelCosts(VP8Proba* const proba); |
| static WEBP_INLINE int VP8LevelCost(const uint16_t* const table, int level) { |
| return VP8LevelFixedCosts[level] |
| + table[(level > MAX_VARIABLE_LEVEL) ? MAX_VARIABLE_LEVEL : level]; |
| } |
| |
| // Mode costs |
| extern const uint16_t VP8FixedCostsUV[4]; |
| extern const uint16_t VP8FixedCostsI16[4]; |
| extern const uint16_t VP8FixedCostsI4[NUM_BMODES][NUM_BMODES][NUM_BMODES]; |
| |
| //------------------------------------------------------------------------------ |
| |
| #ifdef __cplusplus |
| } // extern "C" |
| #endif |
| |
| #endif /* WEBP_ENC_COST_H_ */ |