huffman: use a named identifer for the bits constant
[libav.git] / libavcodec / huffman.h
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6168781f 1/*
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2 * Copyright (C) 2007 Aurelien Jacobs <aurel@gnuage.org>
3 *
2912e87a 4 * This file is part of Libav.
437c2079 5 *
2912e87a 6 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 11 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 17 * License along with Libav; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
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21/**
22 * @file
23 * huffman tree builder and VLC generator
24 */
25
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26#ifndef AVCODEC_HUFFMAN_H
27#define AVCODEC_HUFFMAN_H
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28
29#include "avcodec.h"
9106a698 30#include "get_bits.h"
437c2079 31
e4cbf752 32typedef struct Node {
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33 int16_t sym;
34 int16_t n0;
35 uint32_t count;
36} Node;
37
bac02ed3 38#define FF_HUFFMAN_FLAG_HNODE_FIRST 0x01
a73cbf97 39#define FF_HUFFMAN_FLAG_ZERO_COUNT 0x02
5a19bce2 40#define FF_HUFFMAN_BITS 9
bac02ed3 41
3d52bca6 42typedef int (*HuffCmp)(const void *va, const void *vb);
437c2079 43int ff_huff_build_tree(AVCodecContext *avctx, VLC *vlc, int nb_codes,
3d52bca6 44 Node *nodes, HuffCmp cmp, int flags);
437c2079 45
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46void ff_huff_gen_len_table(uint8_t *dst, const uint64_t *stats);
47
98790382 48#endif /* AVCODEC_HUFFMAN_H */