1 /*
2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #ifndef VP9_ENCODER_VP9_TREEWRITER_H_
12 #define VP9_ENCODER_VP9_TREEWRITER_H_
13
14 #include "vpx_dsp/bitwriter.h"
15
16 #ifdef __cplusplus
17 extern "C" {
18 #endif
19
20 void vp9_tree_probs_from_distribution(vpx_tree tree,
21 unsigned int branch_ct[ /* n - 1 */ ][2],
22 const unsigned int num_events[ /* n */ ]);
23
24 struct vp9_token {
25 int value;
26 int len;
27 };
28
29 void vp9_tokens_from_tree(struct vp9_token*, const vpx_tree_index *);
30
vp9_write_tree(vpx_writer * w,const vpx_tree_index * tree,const vpx_prob * probs,int bits,int len,vpx_tree_index i)31 static INLINE void vp9_write_tree(vpx_writer *w, const vpx_tree_index *tree,
32 const vpx_prob *probs, int bits, int len,
33 vpx_tree_index i) {
34 do {
35 const int bit = (bits >> --len) & 1;
36 vpx_write(w, bit, probs[i >> 1]);
37 i = tree[i + bit];
38 } while (len);
39 }
40
vp9_write_token(vpx_writer * w,const vpx_tree_index * tree,const vpx_prob * probs,const struct vp9_token * token)41 static INLINE void vp9_write_token(vpx_writer *w, const vpx_tree_index *tree,
42 const vpx_prob *probs,
43 const struct vp9_token *token) {
44 vp9_write_tree(w, tree, probs, token->value, token->len, 0);
45 }
46
47 #ifdef __cplusplus
48 } // extern "C"
49 #endif
50
51 #endif // VP9_ENCODER_VP9_TREEWRITER_H_
52