yading@10: /*
yading@10:  * Copyright (C) 2007  Aurelien Jacobs <aurel@gnuage.org>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * huffman tree builder and VLC generator
yading@10:  */
yading@10: 
yading@10: #ifndef AVCODEC_HUFFMAN_H
yading@10: #define AVCODEC_HUFFMAN_H
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "get_bits.h"
yading@10: 
yading@10: typedef struct Node {
yading@10:     int16_t  sym;
yading@10:     int16_t  n0;
yading@10:     uint32_t count;
yading@10: } Node;
yading@10: 
yading@10: #define FF_HUFFMAN_FLAG_HNODE_FIRST 0x01
yading@10: #define FF_HUFFMAN_FLAG_ZERO_COUNT  0x02
yading@10: 
yading@10: typedef int (*HuffCmp)(const void *va, const void *vb);
yading@10: int ff_huff_build_tree(AVCodecContext *avctx, VLC *vlc, int nb_codes,
yading@10:                        Node *nodes, HuffCmp cmp, int flags);
yading@10: 
yading@10: void ff_huff_gen_len_table(uint8_t *dst, const uint64_t *stats);
yading@10: 
yading@10: #endif /* AVCODEC_HUFFMAN_H */