1/* 2 * Copyright (C) 2007 Aurelien Jacobs <aurel@gnuage.org> 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21/** 22 * @file 23 * huffman tree builder and VLC generator 24 */ 25 26#ifndef AVCODEC_HUFFMAN_H 27#define AVCODEC_HUFFMAN_H 28 29#include <stdint.h> 30 31#include "vlc.h" 32 33typedef struct Node { 34 int16_t sym; 35 int16_t n0; 36 uint32_t count; 37} Node; 38 39#define FF_HUFFMAN_FLAG_HNODE_FIRST 0x01 40#define FF_HUFFMAN_FLAG_ZERO_COUNT 0x02 41#define FF_HUFFMAN_BITS 10 42 43typedef int (*HuffCmp)(const void *va, const void *vb); 44int ff_huff_build_tree(void *logctx, VLC *vlc, int nb_codes, int nb_bits, 45 Node *nodes, HuffCmp cmp, int flags); 46 47int ff_huff_gen_len_table(uint8_t *dst, const uint64_t *stats, int n, int skip0); 48 49#endif /* AVCODEC_HUFFMAN_H */ 50