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