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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_
#include "vpx_dsp/bitwriter.h"
#ifdef __cplusplus
extern "C" {
#endif
void vp9_tree_probs_from_distribution(vpx_tree tree,
unsigned int branch_ct[ /* n - 1 */ ][2],
const unsigned int num_events[ /* n */ ]);
struct vp9_token {
int value;
int len;
};
void vp9_tokens_from_tree(struct vp9_token*, const vpx_tree_index *);
static INLINE void vp9_write_tree(vpx_writer *w, const vpx_tree_index *tree,
const vpx_prob *probs, int bits, int len,
vpx_tree_index i) {
do {
const int bit = (bits >> --len) & 1;
vpx_write(w, bit, probs[i >> 1]);
i = tree[i + bit];
} while (len);
}
static INLINE void vp9_write_token(vpx_writer *w, const vpx_tree_index *tree,
const vpx_prob *probs,
const struct vp9_token *token) {
vp9_write_tree(w, tree, probs, token->value, token->len, 0);
}
#ifdef __cplusplus
} // extern "C"
#endif
#endif // VP9_ENCODER_VP9_TREEWRITER_H_
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