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| 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 | |
| 22 extern "C" { | |
| 23 #endif | |
| 24 | |
| 25 // On-the-fly info about the current set of residuals. Handy to avoid | |
| 26 // passing zillions of params. | |
| 27 typedef struct VP8Residual VP8Residual; | |
| 28 struct VP8Residual { | |
| 29 int first; | |
| 30 int last; | |
| 31 const int16_t* coeffs; | |
| 32 | |
| 33 int coeff_type; | |
| 34 ProbaArray* prob; | |
| 35 StatsArray* stats; | |
| 36 CostArrayPtr costs; | |
| 37 }; | |
| 38 | |
| 39 void VP8InitResidual(int first, int coeff_type, | |
| 40 VP8Encoder* const enc, VP8Residual* const res); | |
| 41 | |
| 42 int VP8RecordCoeffs(int ctx, const VP8Residual* const res); | |
| 43 | |
| 44 // Record proba context used. | |
| 45 static WEBP_INLINE int VP8RecordStats(int bit, proba_t* const stats) { | |
| 46 proba_t p = *stats; | |
| 47 // An overflow is inbound. Note we handle this at 0xfffe0000u instead of | |
| 48 // 0xffff0000u to make sure p + 1u does not overflow. | |
| 49 if (p >= 0xfffe0000u) { | |
| 50 p = ((p + 1u) >> 1) & 0x7fff7fffu; // -> divide the stats by 2. | |
| 51 } | |
| 52 // record bit count (lower 16 bits) and increment total count (upper 16 bits). | |
| 53 p += 0x00010000u + bit; | |
| 54 *stats = p; | |
| 55 return bit; | |
| 56 } | |
| 57 | |
| 58 // Cost of coding one event with probability 'proba'. | |
| 59 static WEBP_INLINE int VP8BitCost(int bit, uint8_t proba) { | |
| 60 return !bit ? VP8EntropyCost[proba] : VP8EntropyCost[255 - proba]; | |
| 61 } | |
| 62 | |
| 63 // Level cost calculations | |
| 64 extern const uint16_t VP8LevelCodes[MAX_VARIABLE_LEVEL][2]; | |
| 65 void VP8CalculateLevelCosts(VP8EncProba* const proba); | |
| 66 static WEBP_INLINE int VP8LevelCost(const uint16_t* const table, int level) { | |
| 67 return VP8LevelFixedCosts[level] | |
| 68 + table[(level > MAX_VARIABLE_LEVEL) ? MAX_VARIABLE_LEVEL : level]; | |
| 69 } | |
| 70 | |
| 71 // Mode costs | |
| 72 extern const uint16_t VP8FixedCostsUV[4]; | |
| 73 extern const uint16_t VP8FixedCostsI16[4]; | |
| 74 extern const uint16_t VP8FixedCostsI4[NUM_BMODES][NUM_BMODES][NUM_BMODES]; | |
| 75 | |
| 76 //------------------------------------------------------------------------------ | |
| 77 | |
| 78 #ifdef __cplusplus | |
| 79 } // extern "C" | |
| 80 #endif | |
| 81 | |
| 82 #endif /* WEBP_ENC_COST_H_ */ | |
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Chromium Code Reviews
Issue 2651883004:
libwebp-0.6.0-rc1 (Closed)
