apps/codecs/libmad/huffman.h

   1 /*
   2  * libmad - MPEG audio decoder library
   3  * Copyright (C) 2000-2004 Underbit Technologies, Inc.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  *
  19  * $Id$
  20  */
  21
  22 # ifndef LIBMAD_HUFFMAN_H
  23 # define LIBMAD_HUFFMAN_H
  24
  25 union huffquad {
  26   struct {
  27     unsigned short final  :  1;
  28     unsigned short bits   :  3;
  29     unsigned short offset : 12;
  30   } ptr;
  31   struct {
  32     unsigned short final  :  1;
  33     unsigned short hlen   :  3;
  34     unsigned short v      :  1;
  35     unsigned short w      :  1;
  36     unsigned short x      :  1;
  37     unsigned short y      :  1;
  38   } value;
  39   unsigned short final    :  1;
  40 };
  41
  42 union huffpair {
  43   struct {
  44     unsigned short final  :  1;
  45     unsigned short bits   :  3;
  46     unsigned short offset : 12;
  47   } ptr;
  48   struct {
  49     unsigned short final  :  1;
  50     unsigned short hlen   :  3;
  51     unsigned short x      :  4;
  52     unsigned short y      :  4;
  53   } value;
  54   unsigned short final    :  1;
  55 };
  56
  57 struct hufftable {
  58   union huffpair const *table;
  59   unsigned short linbits;
  60   unsigned short startbits;
  61 };
  62
  63 extern union huffquad const *const mad_huff_quad_table[2];
  64 extern struct hufftable const mad_huff_pair_table[32];
  65
  66 # endif