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/*
* Copyright (c) 2010 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 VP9_ENCODER_VP9_TREEWRITER_H_
#define VP9_ENCODER_VP9_TREEWRITER_H_
/* Trees map alphabets into huffman-like codes suitable for an arithmetic
bit coder. Timothy S Murphy 11 October 2004 */
#include "vp9/common/vp9_treecoder.h"
#include "vp9/encoder/vp9_boolhuff.h" /* for now */
#define vp9_write_prob(w, v) vp9_write_literal((w), (v), 8)
/* Approximate length of an encoded bool in 256ths of a bit at given prob */
#define vp9_cost_zero(x) (vp9_prob_cost[x])
#define vp9_cost_one(x) vp9_cost_zero(vp9_complement(x))
#define vp9_cost_bit(x, b) vp9_cost_zero((b) ? vp9_complement(x) : (x))
/* VP8BC version is scaled by 2^20 rather than 2^8; see bool_coder.h */
/* Both of these return bits, not scaled bits. */
static INLINE unsigned int cost_branch256(const unsigned int ct[2],
vp9_prob p) {
return ct[0] * vp9_cost_zero(p) + ct[1] * vp9_cost_one(p);
}
static INLINE unsigned int cost_branch(const unsigned int ct[2],
vp9_prob p) {
return cost_branch256(ct, p) >> 8;
}
static INLINE void treed_write(vp9_writer *w,
vp9_tree tree, const vp9_prob *probs,
int bits, int len) {
vp9_tree_index i = 0;
do {
const int bit = (bits >> --len) & 1;
vp9_write(w, bit, probs[i >> 1]);
i = tree[i + bit];
} while (len);
}
static INLINE void write_token(vp9_writer *w, vp9_tree tree,
const vp9_prob *probs,
const struct vp9_token *token) {
treed_write(w, tree, probs, token->value, token->len);
}
static INLINE int treed_cost(vp9_tree tree, const vp9_prob *probs,
int bits, int len) {
int cost = 0;
vp9_tree_index i = 0;
do {
const int bit = (bits >> --len) & 1;
cost += vp9_cost_bit(probs[i >> 1], bit);
i = tree[i + bit];
} while (len);
return cost;
}
static INLINE int cost_token(vp9_tree tree, const vp9_prob *probs,
const struct vp9_token *token) {
return treed_cost(tree, probs, token->value, token->len);
}
void vp9_cost_tokens(int *costs, const vp9_prob *probs, vp9_tree tree);
void vp9_cost_tokens_skip(int *costs, const vp9_prob *probs, vp9_tree tree);
#endif // VP9_ENCODER_VP9_TREEWRITER_H_
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