huffman.h

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/*
 * mad - MPEG audio decoder
 * Copyright (C) 2000-2001 Robert Leslie
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * $Id: huffman.h,v 1.1 2002/03/07 11:59:42 anadelt Exp $
 */

# ifndef LIBMAD_HUFFMAN_H
# define LIBMAD_HUFFMAN_H

union huffquad {
  struct {
    unsigned final  :  1;
    unsigned hlen   :  3;
    unsigned v      :  1;
    unsigned w      :  1;
    unsigned x      :  1;
    unsigned y      :  1;

    unsigned rest   :  8;  /* see huffman.c */
  } value;
  struct {
    unsigned final  :  1;
    unsigned bits   :  3;
    unsigned offset : 12;
  } ptr;
  unsigned final    :  1;
};

union huffpair {
  struct {
    unsigned final  :  1;
    unsigned hlen   :  3;
    unsigned x      :  4;
    unsigned y      :  4;

    unsigned rest   :  4;  /* see huffman.c */
  } value;
  struct {
    unsigned final  :  1;
    unsigned bits   :  3;
    unsigned offset : 12;
  } ptr;
  unsigned final    :  1;
};

struct hufftable {
  union huffpair const *table;
  unsigned short linbits;
  unsigned short startbits;
};

extern union huffquad const *const mad_huff_quad_table[2];
extern struct hufftable const mad_huff_pair_table[32];

# endif