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1 /*
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2 * libmad - MPEG audio decoder library
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3 * Copyright (C) 2000-2004 Underbit Technologies, Inc.
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4 *
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5 * This program is free software; you can redistribute it and/or modify
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6 * it under the terms of the GNU General Public License as published by
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7 * the Free Software Foundation; either version 2 of the License, or
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8 * (at your option) any later version.
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9 *
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10 * This program is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 * GNU General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU General Public License
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16 * along with this program; if not, write to the Free Software
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17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18 *
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19 * $Id: huffman.h,v 1.11 2004/01/23 09:41:32 rob Exp $
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20 */
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21
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22 # ifndef LIBMAD_HUFFMAN_H
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23 # define LIBMAD_HUFFMAN_H
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24
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25 union huffquad {
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26 struct {
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27 unsigned short final : 1;
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28 unsigned short bits : 3;
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29 unsigned short offset : 12;
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30 } ptr;
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31 struct {
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32 unsigned short final : 1;
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33 unsigned short hlen : 3;
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34 unsigned short v : 1;
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35 unsigned short w : 1;
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36 unsigned short x : 1;
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37 unsigned short y : 1;
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38 } value;
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39 unsigned short final : 1;
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40 };
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41
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42 union huffpair {
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43 struct {
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44 unsigned short final : 1;
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45 unsigned short bits : 3;
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46 unsigned short offset : 12;
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47 } ptr;
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48 struct {
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49 unsigned short final : 1;
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50 unsigned short hlen : 3;
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51 unsigned short x : 4;
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52 unsigned short y : 4;
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53 } value;
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54 unsigned short final : 1;
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55 };
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56
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57 struct hufftable {
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58 union huffpair const *table;
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59 unsigned short linbits;
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60 unsigned short startbits;
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61 };
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62
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63 extern union huffquad const *const mad_huff_quad_table[2];
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64 extern struct hufftable const mad_huff_pair_table[32];
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65
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66 # endif
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