81 строка
2.4 KiB
C
81 строка
2.4 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. 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 LICENSE 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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#ifndef VP9_ENCODER_VP9_TREEWRITER_H_
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#define VP9_ENCODER_VP9_TREEWRITER_H_
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#include "vp9/encoder/vp9_writer.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define vp9_cost_zero(prob) (vp9_prob_cost[prob])
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#define vp9_cost_one(prob) vp9_cost_zero(vp9_complement(prob))
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#define vp9_cost_bit(prob, bit) vp9_cost_zero((bit) ? vp9_complement(prob) \
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: (prob))
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static INLINE unsigned int cost_branch256(const unsigned int ct[2],
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vp9_prob p) {
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return ct[0] * vp9_cost_zero(p) + ct[1] * vp9_cost_one(p);
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}
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static INLINE int treed_cost(vp9_tree tree, const vp9_prob *probs,
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int bits, int len) {
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int cost = 0;
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vp9_tree_index i = 0;
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do {
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const int bit = (bits >> --len) & 1;
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cost += vp9_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 vp9_cost_tokens(int *costs, const vp9_prob *probs, vp9_tree tree);
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void vp9_cost_tokens_skip(int *costs, const vp9_prob *probs, vp9_tree tree);
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void vp9_tree_probs_from_distribution(vp9_tree tree,
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unsigned int branch_ct[ /* n - 1 */ ][2],
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const unsigned int num_events[ /* n */ ]);
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struct vp9_token {
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int value;
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int len;
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};
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void vp9_tokens_from_tree(struct vp9_token*, const vp9_tree_index *);
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static INLINE void vp9_write_tree(vp9_writer *w, const vp9_tree_index *tree,
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const vp9_prob *probs, int bits, int len,
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vp9_tree_index i) {
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do {
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const int bit = (bits >> --len) & 1;
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vp9_write(w, bit, probs[i >> 1]);
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i = tree[i + bit];
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} while (len);
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}
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static INLINE void vp9_write_token(vp9_writer *w, const vp9_tree_index *tree,
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const vp9_prob *probs,
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const struct vp9_token *token) {
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vp9_write_tree(w, tree, probs, token->value, token->len, 0);
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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 // VP9_ENCODER_VP9_TREEWRITER_H_
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