libavcodec/huffman.h
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00001 /*
00002  * Copyright (C) 2007  Aurelien Jacobs <aurel@gnuage.org>
00003  *
00004  * This file is part of Libav.
00005  *
00006  * Libav is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * Libav is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with Libav; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00026 #ifndef AVCODEC_HUFFMAN_H
00027 #define AVCODEC_HUFFMAN_H
00028 
00029 #include "avcodec.h"
00030 #include "get_bits.h"
00031 
00032 typedef struct {
00033     int16_t  sym;
00034     int16_t  n0;
00035     uint32_t count;
00036 } Node;
00037 
00038 #define FF_HUFFMAN_FLAG_HNODE_FIRST 0x01
00039 #define FF_HUFFMAN_FLAG_ZERO_COUNT  0x02
00040 
00041 typedef int (*HuffCmp)(const void *va, const void *vb);
00042 int ff_huff_build_tree(AVCodecContext *avctx, VLC *vlc, int nb_codes,
00043                        Node *nodes, HuffCmp cmp, int flags);
00044 
00045 #endif /* AVCODEC_HUFFMAN_H */