| // 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_ENC_H_ |
| #define WEBP_ENC_COST_ENC_H_ |
| |
| #if defined(STARBOARD) |
| #include "starboard/common/log.h" |
| #else |
| #include <assert.h> |
| #include <stdlib.h> |
| #endif |
| |
| #include "src/enc/vp8i_enc.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 VP8Residual VP8Residual; |
| struct VP8Residual { |
| int first; |
| int last; |
| const int16_t* coeffs; |
| |
| int coeff_type; |
| ProbaArray* prob; |
| StatsArray* stats; |
| CostArrayPtr costs; |
| }; |
| |
| void VP8InitResidual(int first, int coeff_type, |
| VP8Encoder* const enc, VP8Residual* const res); |
| |
| int VP8RecordCoeffs(int ctx, const VP8Residual* const res); |
| |
| // Record proba context used. |
| static WEBP_INLINE int VP8RecordStats(int bit, proba_t* const stats) { |
| proba_t p = *stats; |
| // An overflow is inbound. Note we handle this at 0xfffe0000u instead of |
| // 0xffff0000u to make sure p + 1u does not overflow. |
| if (p >= 0xfffe0000u) { |
| p = ((p + 1u) >> 1) & 0x7fff7fffu; // -> divide the stats by 2. |
| } |
| // record bit count (lower 16 bits) and increment total count (upper 16 bits). |
| p += 0x00010000u + bit; |
| *stats = p; |
| return bit; |
| } |
| |
| // 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]; |
| } |
| |
| // Level cost calculations |
| extern const uint16_t VP8LevelCodes[MAX_VARIABLE_LEVEL][2]; |
| void VP8CalculateLevelCosts(VP8EncProba* 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_ENC_H_ |