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Open Source Computer Vision Library
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48 lines
1.6 KiB
48 lines
1.6 KiB
// Copyright 2011 Google Inc. All Rights Reserved. |
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// |
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// This code is licensed under the same terms as WebM: |
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// Software License Agreement: http://www.webmproject.org/license/software/ |
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// Additional IP Rights Grant: http://www.webmproject.org/license/additional/ |
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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 "./vp8enci.h" |
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#if defined(__cplusplus) || defined(c_plusplus) |
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extern "C" { |
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#endif |
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extern const uint16_t VP8LevelFixedCosts[2048]; // approximate cost per level |
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extern const uint16_t VP8EntropyCost[256]; // 8bit fixed-point log(p) |
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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(VP8Proba* 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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#if defined(__cplusplus) || defined(c_plusplus) |
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} // extern "C" |
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#endif |
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#endif /* WEBP_ENC_COST_H_ */
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