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/libavcodec/huffman.h

http://github.com/FFmpeg/FFmpeg
C Header | 48 lines | 17 code | 8 blank | 23 comment | 0 complexity | 02c1346a1b7ee5852ef3971475f73cec MD5 | raw file
 1/*
 2 * Copyright (C) 2007  Aurelien Jacobs <aurel@gnuage.org>
 3 *
 4 * This file is part of FFmpeg.
 5 *
 6 * FFmpeg is free software; you can redistribute it and/or
 7 * modify it under the terms of the GNU Lesser General Public
 8 * License as published by the Free Software Foundation; either
 9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21/**
22 * @file
23 * huffman tree builder and VLC generator
24 */
25
26#ifndef AVCODEC_HUFFMAN_H
27#define AVCODEC_HUFFMAN_H
28
29#include "avcodec.h"
30#include "vlc.h"
31
32typedef struct Node {
33    int16_t  sym;
34    int16_t  n0;
35    uint32_t count;
36} Node;
37
38#define FF_HUFFMAN_FLAG_HNODE_FIRST 0x01
39#define FF_HUFFMAN_FLAG_ZERO_COUNT  0x02
40#define FF_HUFFMAN_BITS 10
41
42typedef int (*HuffCmp)(const void *va, const void *vb);
43int ff_huff_build_tree(AVCodecContext *avctx, VLC *vlc, int nb_codes, int nb_bits,
44                       Node *nodes, HuffCmp cmp, int flags);
45
46int ff_huff_gen_len_table(uint8_t *dst, const uint64_t *stats, int n, int skip0);
47
48#endif /* AVCODEC_HUFFMAN_H */