Statistics
| Branch: | Revision:

ffmpeg / libavcodec / huffman.h @ 2912e87a

History | View | Annotate | Download (1.32 KB)

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 Libav.
7
 *
8
 * Libav 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
 * Libav 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 Libav; 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

    
29
typedef 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

    
38
typedef int (*HuffCmp)(const void *va, const void *vb);
39
int ff_huff_build_tree(AVCodecContext *avctx, VLC *vlc, int nb_codes,
40
                       Node *nodes, HuffCmp cmp, int flags);
41

    
42
#endif /* AVCODEC_HUFFMAN_H */