64 строки
1.8 KiB
C
64 строки
1.8 KiB
C
/*
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* Copyright (c) 2016, Alliance for Open Media. All rights reserved
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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#ifndef AV1_ENCODER_COST_H_
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#define AV1_ENCODER_COST_H_
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#include "aom_dsp/prob.h"
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#include "aom/aom_integer.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern const uint16_t av1_prob_cost[256];
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// The factor to scale from cost in bits to cost in av1_prob_cost units.
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#define AV1_PROB_COST_SHIFT 9
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#define av1_cost_zero(prob) (av1_prob_cost[prob])
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#define av1_cost_one(prob) av1_cost_zero(256 - (prob))
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#define av1_cost_bit(prob, bit) av1_cost_zero((bit) ? 256 - (prob) : (prob))
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// Cost of coding an n bit literal, using 128 (i.e. 50%) probability
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// for each bit.
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#define av1_cost_literal(n) ((n) * (1 << AV1_PROB_COST_SHIFT))
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static INLINE unsigned int cost_branch256(const unsigned int ct[2],
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aom_prob p) {
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return ct[0] * av1_cost_zero(p) + ct[1] * av1_cost_one(p);
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}
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static INLINE int treed_cost(aom_tree tree, const aom_prob *probs, int bits,
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int len) {
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int cost = 0;
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aom_tree_index i = 0;
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do {
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const int bit = (bits >> --len) & 1;
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cost += av1_cost_bit(probs[i >> 1], bit);
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i = tree[i + bit];
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} while (len);
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return cost;
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}
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void av1_cost_tokens(int *costs, const aom_prob *probs, aom_tree tree);
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void av1_cost_tokens_skip(int *costs, const aom_prob *probs, aom_tree tree);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // AV1_ENCODER_COST_H_
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