path: root/audio_codec/libmad/huffman.h (plain)
blob: 8eb604d5166eee7ecebecc1ad046a5aa3cf423e9

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