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: huffman.h,v 1.11 2004/01/23 09:41:32 rob Exp $ 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 67