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49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
/*
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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 "avcodec.h"
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#include "get_bits.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(AVCodecContext *avctx, 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);
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#endif /* AVCODEC_HUFFMAN_H */
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