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49 lines
1.4 KiB
49 lines
1.4 KiB
/* |
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* Copyright (C) 2007 Aurelien Jacobs <aurel@gnuage.org> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* huffman tree builder and VLC generator |
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*/ |
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#ifndef AVCODEC_HUFFMAN_H |
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#define AVCODEC_HUFFMAN_H |
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#include <stdint.h> |
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#include "vlc.h" |
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typedef struct Node { |
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int16_t sym; |
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int16_t n0; |
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uint32_t count; |
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} Node; |
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#define FF_HUFFMAN_FLAG_HNODE_FIRST 0x01 |
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#define FF_HUFFMAN_FLAG_ZERO_COUNT 0x02 |
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#define FF_HUFFMAN_BITS 10 |
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typedef int (*HuffCmp)(const void *va, const void *vb); |
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int ff_huff_build_tree(void *logctx, VLC *vlc, int nb_codes, int nb_bits, |
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Node *nodes, HuffCmp cmp, int flags); |
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int ff_huff_gen_len_table(uint8_t *dst, const uint64_t *stats, int n, int skip0); |
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#endif /* AVCODEC_HUFFMAN_H */
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