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author | arpi <arpi@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2001-12-09 15:28:44 +0000 |
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committer | arpi <arpi@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2001-12-09 15:28:44 +0000 |
commit | 3af73ad342db26d0f8e077074115824f2c8ab65e (patch) | |
tree | cd61f9f6f4b9e5994c770c75ffddfe16a5e961f7 /liba52/bitstream.h | |
parent | 1ec539d353decc85942cc1ca8e366d5c89f0f4cb (diff) | |
download | mpv-3af73ad342db26d0f8e077074115824f2c8ab65e.tar.bz2 mpv-3af73ad342db26d0f8e077074115824f2c8ab65e.tar.xz |
imported from liba52 CVS
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@3395 b3059339-0415-0410-9bf9-f77b7e298cf2
Diffstat (limited to 'liba52/bitstream.h')
-rw-r--r-- | liba52/bitstream.h | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/liba52/bitstream.h b/liba52/bitstream.h new file mode 100644 index 0000000000..0be249e1f2 --- /dev/null +++ b/liba52/bitstream.h @@ -0,0 +1,82 @@ +/* + * bitstream.h + * Copyright (C) 2000-2001 Michel Lespinasse <walken@zoy.org> + * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca> + * + * This file is part of a52dec, a free ATSC A-52 stream decoder. + * See http://liba52.sourceforge.net/ for updates. + * + * a52dec is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * a52dec is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +/* (stolen from the kernel) */ +#ifdef WORDS_BIGENDIAN + +# define swab32(x) (x) + +#else + +# if defined (__i386__) + +# define swab32(x) __i386_swab32(x) + static inline const uint32_t __i386_swab32(uint32_t x) + { + __asm__("bswap %0" : "=r" (x) : "0" (x)); + return x; + } + +# else + +# define swab32(x)\ +((((uint8_t*)&x)[0] << 24) | (((uint8_t*)&x)[1] << 16) | \ + (((uint8_t*)&x)[2] << 8) | (((uint8_t*)&x)[3])) + +# endif +#endif + +extern uint32_t bits_left; +extern uint32_t current_word; + +void bitstream_set_ptr (uint8_t * buf); +uint32_t bitstream_get_bh(uint32_t num_bits); +int32_t bitstream_get_bh_2(uint32_t num_bits); + +static inline uint32_t +bitstream_get(uint32_t num_bits) +{ + uint32_t result; + + if(num_bits < bits_left) { + result = (current_word << (32 - bits_left)) >> (32 - num_bits); + bits_left -= num_bits; + return result; + } + + return bitstream_get_bh(num_bits); +} + +static inline int32_t +bitstream_get_2(uint32_t num_bits) +{ + int32_t result; + + if(num_bits < bits_left) { + result = (((int32_t)current_word) << (32 - bits_left)) >> (32 - num_bits); + bits_left -= num_bits; + return result; + } + + return bitstream_get_bh_2(num_bits); +} |