1/** 2 * @file 3 * huffman tree builder and VLC generator 4 * Copyright (C) 2007 Aurelien Jacobs <aurel@gnuage.org> 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23#ifndef AVCODEC_HUFFMAN_H 24#define AVCODEC_HUFFMAN_H 25 26#include "avcodec.h" 27#include "get_bits.h" 28 29typedef struct { 30 int16_t sym; 31 int16_t n0; 32 uint32_t count; 33} Node; 34 35#define FF_HUFFMAN_FLAG_HNODE_FIRST 0x01 36#define FF_HUFFMAN_FLAG_ZERO_COUNT 0x02 37 38typedef int (*HuffCmp)(const void *va, const void *vb); 39int ff_huff_build_tree(AVCodecContext *avctx, VLC *vlc, int nb_codes, 40 Node *nodes, HuffCmp cmp, int flags); 41 42#endif /* AVCODEC_HUFFMAN_H */ 43