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Diffstat (limited to 'liba52/bitstream.h')
| -rw-r--r-- | liba52/bitstream.h | 152 |
1 files changed, 0 insertions, 152 deletions
diff --git a/liba52/bitstream.h b/liba52/bitstream.h deleted file mode 100644 index 76f5556ea9..0000000000 --- a/liba52/bitstream.h +++ /dev/null @@ -1,152 +0,0 @@ -/* - * bitstream.h - * Copyright (C) 2000-2002 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. - * - * Modified for use with MPlayer, changes contained in liba52_changes.diff. - * detailed changelog at http://svn.mplayerhq.hu/mplayer/trunk/ - * $Id$ - * - * 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 - */ - -/* code from ffmpeg/libavcodec */ -#if defined(__sparc__) || defined(hpux) -/* - * the alt bitstream reader performs unaligned memory accesses; that doesn't work - * on sparc/hpux. For now, disable ALT_BITSTREAM_READER. - */ -#undef ALT_BITSTREAM_READER -#else -// alternative (faster) bitstram reader (reades upto 3 bytes over the end of the input) -#define ALT_BITSTREAM_READER - -/* used to avoid misaligned exceptions on some archs (alpha, ...) */ -#if ARCH_X86 || HAVE_ARMV6 -# define unaligned32(a) (*(uint32_t*)(a)) -#else -# ifdef __GNUC__ -static inline uint32_t unaligned32(const void *v) { - struct Unaligned { - uint32_t i; - } __attribute__((packed)); - - return ((const struct Unaligned *) v)->i; -} -# elif defined(__DECC) -static inline uint32_t unaligned32(const void *v) { - return *(const __unaligned uint32_t *) v; -} -# else -static inline uint32_t unaligned32(const void *v) { - return *(const uint32_t *) v; -} -# endif -#endif //!ARCH_X86 - -#endif - -/* (stolen from the kernel) */ -#if HAVE_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) __generic_swab32(x) - static inline const uint32_t __generic_swab32(uint32_t x) - { - return ((((uint8_t*)&x)[0] << 24) | (((uint8_t*)&x)[1] << 16) | - (((uint8_t*)&x)[2] << 8) | (((uint8_t*)&x)[3])); - } -# endif -#endif - -#ifdef ALT_BITSTREAM_READER -extern int indx; -#endif - -void a52_bitstream_set_ptr (a52_state_t * state, uint8_t * buf); -uint32_t a52_bitstream_get_bh (a52_state_t * state, uint32_t num_bits); -int32_t a52_bitstream_get_bh_2 (a52_state_t * state, uint32_t num_bits); - -static inline uint32_t bitstream_get (a52_state_t * state, uint32_t num_bits) -{ -#ifdef ALT_BITSTREAM_READER - uint32_t result= swab32( unaligned32(((uint8_t *)state->buffer_start)+(indx>>3)) ); - - result<<= (indx&0x07); - result>>= 32 - num_bits; - indx+= num_bits; - - return result; -#else - uint32_t result; - - if (num_bits < state->bits_left) { - result = (state->current_word << (32 - state->bits_left)) >> (32 - num_bits); - state->bits_left -= num_bits; - return result; - } - - return a52_bitstream_get_bh (state, num_bits); -#endif -} - -static inline void bitstream_skip(a52_state_t * state, int num_bits) -{ -#ifdef ALT_BITSTREAM_READER - indx+= num_bits; -#else - bitstream_get(state, num_bits); -#endif -} - -static inline int32_t bitstream_get_2 (a52_state_t * state, uint32_t num_bits) -{ -#ifdef ALT_BITSTREAM_READER - int32_t result= swab32( unaligned32(((uint8_t *)state->buffer_start)+(indx>>3)) ); - - result<<= (indx&0x07); - result>>= 32 - num_bits; - indx+= num_bits; - - return result; -#else - int32_t result; - - if (num_bits < state->bits_left) { - result = (((int32_t)state->current_word) << (32 - state->bits_left)) >> (32 - num_bits); - state->bits_left -= num_bits; - return result; - } - - return a52_bitstream_get_bh_2 (state, num_bits); -#endif -} |