/*

  * 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 "vlc.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

 #define FF_HUFFMAN_BITS 10

 typedef int (*HuffCmp)(const void *va, const void *vb);

 int ff_huff_build_tree(AVCodecContext *avctx, VLC *vlc, int nb_codes, int nb_bits,

                        Node *nodes, HuffCmp cmp, int flags);

 int ff_huff_gen_len_table(uint8_t *dst, const uint64_t *stats, int n, int skip0);

 #endif /* AVCODEC_HUFFMAN_H */