libmad/bit.h

   1 /*
   2  * libmad - MPEG audio decoder library
   3  * Copyright (C) 2000-2003 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  */
  20
  21 # ifndef LIBMAD_BIT_H
  22 # define LIBMAD_BIT_H
  23
  24 #include <gctypes.h>
  25
  26 struct mad_bitptr {
  27   u8 const *byte;
  28   u16 cache;
  29   u16 left;
  30 };
  31
  32 void mad_bit_init(struct mad_bitptr *, u8 const *);
  33
  34 # define mad_bit_finish(bitptr)         /* nothing */
  35
  36 u32 mad_bit_length(struct mad_bitptr const *,
  37                             struct mad_bitptr const *);
  38
  39 # define mad_bit_bitsleft(bitptr)  ((bitptr)->left)
  40 u8 const *mad_bit_nextbyte(struct mad_bitptr const *);
  41
  42 void mad_bit_skip(struct mad_bitptr *, u32);
  43 u32 mad_bit_read(struct mad_bitptr *, u32);
  44 void mad_bit_write(struct mad_bitptr *, u32, u32);
  45
  46 u16 mad_bit_crc(struct mad_bitptr, u32, u16);
  47
  48 # endif