apps/codecs/libmad/bit.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_BIT_H
  23 # define LIBMAD_BIT_H
  24
  25 struct mad_bitptr {
  26   uint32_t *ptr;
  27   uint32_t readbit;
  28 };
  29
  30 void mad_bit_init(struct mad_bitptr *, unsigned char const *);
  31
  32 # define mad_bit_finish(bitptr)         /* nothing */
  33
  34 unsigned int mad_bit_length(struct mad_bitptr const *,
  35                             struct mad_bitptr const *);
  36
  37 unsigned char mad_bit_bitsleft(struct mad_bitptr const *bitptr);
  38 unsigned char const *mad_bit_nextbyte(struct mad_bitptr const *);
  39
  40 void mad_bit_skip(struct mad_bitptr *, unsigned int);
  41 uint32_t mad_bit_read(struct mad_bitptr *, unsigned int);
  42 void mad_bit_write(struct mad_bitptr *, unsigned int, uint32_t);
  43
  44 unsigned short mad_bit_crc(struct mad_bitptr, unsigned int, unsigned short);
  45
  46 # endif