Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / huffman.h
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 "get_bits.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 */