1/**
2 * @file
3 * huffman tree builder and VLC generator
4 * Copyright (C) 2007  Aurelien Jacobs <aurel@gnuage.org>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#ifndef AVCODEC_HUFFMAN_H
24#define AVCODEC_HUFFMAN_H
25
26#include "avcodec.h"
27#include "get_bits.h"
28
29typedef struct {
30    int16_t  sym;
31    int16_t  n0;
32    uint32_t count;
33} Node;
34
35#define FF_HUFFMAN_FLAG_HNODE_FIRST 0x01
36#define FF_HUFFMAN_FLAG_ZERO_COUNT  0x02
37
38typedef int (*HuffCmp)(const void *va, const void *vb);
39int ff_huff_build_tree(AVCodecContext *avctx, VLC *vlc, int nb_codes,
40                       Node *nodes, HuffCmp cmp, int flags);
41
42#endif /* AVCODEC_HUFFMAN_H */
43