3 * Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
4 * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
6 * This file is part of a52dec, a free ATSC A-52 stream decoder.
7 * See http://liba52.sourceforge.net/ for updates.
9 * a52dec is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * a52dec is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 /* (stolen from the kernel) */
25 #ifdef WORDS_BIGENDIAN
27 # define swab32(x) (x)
31 # if 0 && defined (__i386__)
33 # define swab32(x) __i386_swab32(x)
34 static inline const uint32_t __i386_swab32(uint32_t x)
36 __asm__("bswap %0" : "=r" (x) : "0" (x));
43 ((((uint8_t*)&x)[0] << 24) | (((uint8_t*)&x)[1] << 16) | \
44 (((uint8_t*)&x)[2] << 8) | (((uint8_t*)&x)[3]))
49 extern uint32_t a52_bits_left;
50 extern uint32_t a52_current_word;
52 void a52_bitstream_set_ptr (uint8_t * buf);
53 uint32_t a52_bitstream_get_bh(uint32_t num_bits);
54 int32_t a52_bitstream_get_bh_2(uint32_t num_bits);
56 static inline uint32_t
57 bitstream_get(uint32_t num_bits)
61 if(num_bits < a52_bits_left) {
62 result = (a52_current_word << (32u - a52_bits_left)) >> (32u - num_bits);
63 a52_bits_left -= num_bits;
67 return a52_bitstream_get_bh(num_bits);
71 bitstream_get_2(uint32_t num_bits)
75 if(num_bits < a52_bits_left) {
76 result = (((int32_t)a52_current_word) << (32u - a52_bits_left)) >> (32u - num_bits);
77 a52_bits_left -= num_bits;
81 return a52_bitstream_get_bh_2(num_bits);