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: bit.h,v 1.12 2004/01/23 09:41:32 rob Exp $ 20 */ 21 22 # ifndef LIBMAD_BIT_H 23 # define LIBMAD_BIT_H 24 25 struct mad_bitptr { 26 unsigned char const *byte; 27 unsigned short cache; 28 unsigned short left; 29 }; 30 31 void mad_bit_init(struct mad_bitptr *, unsigned char const *); 32 33 # define mad_bit_finish(bitptr) /* nothing */ 34 35 unsigned int mad_bit_length(struct mad_bitptr const *, 36 struct mad_bitptr const *); 37 38 # define mad_bit_bitsleft(bitptr) ((bitptr)->left) 39 unsigned char const *mad_bit_nextbyte(struct mad_bitptr const *); 40 41 void mad_bit_skip(struct mad_bitptr *, unsigned int); 42 unsigned long mad_bit_read(struct mad_bitptr *, unsigned int); 43 void mad_bit_write(struct mad_bitptr *, unsigned int, unsigned long); 44 45 unsigned short mad_bit_crc(struct mad_bitptr, unsigned int, unsigned short); 46 47 # endif 48