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Open Source Computer Vision Library
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82 lines
2.5 KiB
82 lines
2.5 KiB
// Copyright 2011 Google Inc. All Rights Reserved. |
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// |
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// Use of this source code is governed by a BSD-style license |
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// that can be found in the COPYING file in the root of the source |
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// tree. An additional intellectual property rights grant can be found |
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// in the file PATENTS. All contributing project authors may |
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// be found in the AUTHORS file in the root of the source tree. |
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// ----------------------------------------------------------------------------- |
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// |
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// Cost tables for level and modes. |
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// |
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// Author: Skal (pascal.massimino@gmail.com) |
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#ifndef WEBP_ENC_COST_H_ |
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#define WEBP_ENC_COST_H_ |
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#include <assert.h> |
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#include <stdlib.h> |
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#include "./vp8i_enc.h" |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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// On-the-fly info about the current set of residuals. Handy to avoid |
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// passing zillions of params. |
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typedef struct VP8Residual VP8Residual; |
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struct VP8Residual { |
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int first; |
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int last; |
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const int16_t* coeffs; |
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int coeff_type; |
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ProbaArray* prob; |
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StatsArray* stats; |
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CostArrayPtr costs; |
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}; |
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void VP8InitResidual(int first, int coeff_type, |
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VP8Encoder* const enc, VP8Residual* const res); |
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int VP8RecordCoeffs(int ctx, const VP8Residual* const res); |
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// Record proba context used. |
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static WEBP_INLINE int VP8RecordStats(int bit, proba_t* const stats) { |
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proba_t p = *stats; |
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// An overflow is inbound. Note we handle this at 0xfffe0000u instead of |
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// 0xffff0000u to make sure p + 1u does not overflow. |
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if (p >= 0xfffe0000u) { |
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p = ((p + 1u) >> 1) & 0x7fff7fffu; // -> divide the stats by 2. |
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} |
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// record bit count (lower 16 bits) and increment total count (upper 16 bits). |
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p += 0x00010000u + bit; |
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*stats = p; |
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return bit; |
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} |
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// Cost of coding one event with probability 'proba'. |
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static WEBP_INLINE int VP8BitCost(int bit, uint8_t proba) { |
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return !bit ? VP8EntropyCost[proba] : VP8EntropyCost[255 - proba]; |
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} |
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// Level cost calculations |
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extern const uint16_t VP8LevelCodes[MAX_VARIABLE_LEVEL][2]; |
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void VP8CalculateLevelCosts(VP8EncProba* const proba); |
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static WEBP_INLINE int VP8LevelCost(const uint16_t* const table, int level) { |
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return VP8LevelFixedCosts[level] |
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+ table[(level > MAX_VARIABLE_LEVEL) ? MAX_VARIABLE_LEVEL : level]; |
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} |
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// Mode costs |
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extern const uint16_t VP8FixedCostsUV[4]; |
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extern const uint16_t VP8FixedCostsI16[4]; |
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extern const uint16_t VP8FixedCostsI4[NUM_BMODES][NUM_BMODES][NUM_BMODES]; |
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//------------------------------------------------------------------------------ |
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#ifdef __cplusplus |
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} // extern "C" |
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#endif |
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#endif /* WEBP_ENC_COST_H_ */
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