blob: 4f879e6e84077b44104e6c1b714b7e4ba4f264c0
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 | |
32 | typedef 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 | |
42 | typedef int (*HuffCmp)(const void *va, const void *vb); |
43 | int ff_huff_build_tree(AVCodecContext *avctx, VLC *vlc, int nb_codes, int nb_bits, |
44 | Node *nodes, HuffCmp cmp, int flags); |
45 | |
46 | int ff_huff_gen_len_table(uint8_t *dst, const uint64_t *stats, int n, int skip0); |
47 | |
48 | #endif /* AVCODEC_HUFFMAN_H */ |
49 |