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/*
* Copyright (c) 2016, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 2 Clause License and
* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
* was not distributed with this source code in the LICENSE file, you can
* obtain it at www.aomedia.org/license/software. If the Alliance for Open
* Media Patent License 1.0 was not distributed with this source code in the
* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
*/
#ifndef AV1_ENCODER_COST_H_
#define AV1_ENCODER_COST_H_
#include "aom_dsp/prob.h"
#include "aom/aom_integer.h"
#ifdef __cplusplus
extern "C" {
#endif
extern const uint16_t av1_prob_cost[256];
// The factor to scale from cost in bits to cost in av1_prob_cost units.
#define AV1_PROB_COST_SHIFT 9
#define av1_cost_zero(prob) (av1_prob_cost[prob])
#define av1_cost_one(prob) av1_cost_zero(256 - (prob))
#define av1_cost_bit(prob, bit) av1_cost_zero((bit) ? 256 - (prob) : (prob))
// Cost of coding an n bit literal, using 128 (i.e. 50%) probability
// for each bit.
#define av1_cost_literal(n) ((n) * (1 << AV1_PROB_COST_SHIFT))
// Calculate the cost of a symbol with probability p15 / 2^15
static INLINE int av1_cost_symbol(aom_cdf_prob p15) {
assert(0 < p15 && p15 < CDF_PROB_TOP);
const int shift = CDF_PROB_BITS - 1 - get_msb(p15);
return av1_cost_zero(get_prob(p15 << shift, CDF_PROB_TOP)) +
av1_cost_literal(shift);
}
static INLINE unsigned int cost_branch256(const unsigned int ct[2],
aom_prob p) {
return ct[0] * av1_cost_zero(p) + ct[1] * av1_cost_one(p);
}
static INLINE int treed_cost(aom_tree tree, const aom_prob *probs, int bits,
int len) {
int cost = 0;
aom_tree_index i = 0;
do {
const int bit = (bits >> --len) & 1;
cost += av1_cost_bit(probs[i >> 1], bit);
i = tree[i + bit];
} while (len);
return cost;
}
void av1_cost_tokens(int *costs, const aom_prob *probs, aom_tree tree);
void av1_cost_tokens_skip(int *costs, const aom_prob *probs, aom_tree tree);
void av1_cost_tokens_from_cdf(int *costs, const aom_cdf_prob *cdf,
const int *inv_map);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // AV1_ENCODER_COST_H_
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