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| Rev | Author | Line No. | Line |
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| 4349 | Serge | 1 | /* |
| 2 | * Copyright (C) 2007 Aurelien Jacobs |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg 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 |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg 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 |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | /** |
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| 22 | * @file |
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| 23 | * huffman tree builder and VLC generator |
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| 24 | */ |
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| 25 | |||
| 26 | #ifndef AVCODEC_HUFFMAN_H |
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| 27 | #define AVCODEC_HUFFMAN_H |
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| 28 | |||
| 29 | #include "avcodec.h" |
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| 30 | #include "get_bits.h" |
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| 31 | |||
| 32 | typedef struct Node { |
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| 33 | int16_t sym; |
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| 34 | int16_t n0; |
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| 35 | uint32_t count; |
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| 36 | } Node; |
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| 37 | |||
| 38 | #define FF_HUFFMAN_FLAG_HNODE_FIRST 0x01 |
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| 39 | #define FF_HUFFMAN_FLAG_ZERO_COUNT 0x02 |
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| 40 | #define FF_HUFFMAN_BITS 10 |
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| 41 | |||
| 42 | typedef int (*HuffCmp)(const void *va, const void *vb); |
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| 43 | int ff_huff_build_tree(AVCodecContext *avctx, VLC *vlc, int nb_codes, int nb_bits, |
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| 44 | Node *nodes, HuffCmp cmp, int flags); |
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| 45 | |||
| 46 | void ff_huff_gen_len_table(uint8_t *dst, const uint64_t *stats); |
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| 47 | |||
| 48 | #endif /* AVCODEC_HUFFMAN_H */ |