71 строка
1.9 KiB
C
71 строка
1.9 KiB
C
/*
|
|
* Copyright (c) 2014 The WebM project authors. All Rights Reserved.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license
|
|
* that can be found in the LICENSE file in the root of the source
|
|
* tree. An additional intellectual property rights grant can be found
|
|
* in the file PATENTS. All contributing project authors may
|
|
* be found in the AUTHORS file in the root of the source tree.
|
|
*/
|
|
|
|
#ifndef AV1_ENCODER_COST_H_
|
|
#define AV1_ENCODER_COST_H_
|
|
|
|
#include "aom_dsp/prob.h"
|
|
#include "aom/aom_integer.h"
|
|
#if CONFIG_ANS
|
|
#include "av1/common/ans.h"
|
|
#endif // CONFIG_ANS
|
|
|
|
#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))
|
|
|
|
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);
|
|
|
|
#if CONFIG_ANS
|
|
void av1_cost_tokens_ans(int *costs, const aom_prob *tree_probs,
|
|
const rans_dec_lut token_cdf, int skip_eob);
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
} // extern "C"
|
|
#endif
|
|
|
|
#endif // AV1_ENCODER_COST_H_
|