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- // 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;
- 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;
- 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_ */
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