/[pcsx2_0.9.7]/trunk/3rdparty/liba52/bitstream.h
ViewVC logotype

Annotation of /trunk/3rdparty/liba52/bitstream.h

Parent Directory Parent Directory | Revision Log Revision Log


Revision 10 - (hide annotations) (download)
Mon Sep 6 11:40:06 2010 UTC (9 years, 5 months ago) by william
File MIME type: text/plain
File size: 2283 byte(s)
exported r3113 from ./upstream/trunk
1 william 10 /*
2     * bitstream.h
3     * Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
4     * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
5     *
6     * This file is part of a52dec, a free ATSC A-52 stream decoder.
7     * See http://liba52.sourceforge.net/ for updates.
8     *
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.
13     *
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.
18     *
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
22     */
23    
24     /* (stolen from the kernel) */
25     #ifdef WORDS_BIGENDIAN
26    
27     # define swab32(x) (x)
28    
29     #else
30    
31     # if 0 && defined (__i386__)
32    
33     # define swab32(x) __i386_swab32(x)
34     static inline const uint32_t __i386_swab32(uint32_t x)
35     {
36     __asm__("bswap %0" : "=r" (x) : "0" (x));
37     return x;
38     }
39    
40     # else
41    
42     # define swab32(x)\
43     ((((uint8_t*)&x)[0] << 24) | (((uint8_t*)&x)[1] << 16) | \
44     (((uint8_t*)&x)[2] << 8) | (((uint8_t*)&x)[3]))
45    
46     # endif
47     #endif
48    
49     void a52_bitstream_set_ptr (a52_state_t * state, uint8_t * buf);
50     uint32_t a52_bitstream_get_bh (a52_state_t * state, uint32_t num_bits);
51     int32_t a52_bitstream_get_bh_2 (a52_state_t * state, uint32_t num_bits);
52    
53     static inline uint32_t bitstream_get (a52_state_t * state, uint32_t num_bits)
54     {
55     uint32_t result;
56    
57     if (num_bits < state->bits_left) {
58     result = (state->current_word << (32 - state->bits_left)) >> (32 - num_bits);
59     state->bits_left -= num_bits;
60     return result;
61     }
62    
63     return a52_bitstream_get_bh (state, num_bits);
64     }
65    
66     static inline int32_t bitstream_get_2 (a52_state_t * state, uint32_t num_bits)
67     {
68     int32_t result;
69    
70     if (num_bits < state->bits_left) {
71     result = (((int32_t)state->current_word) << (32 - state->bits_left)) >> (32 - num_bits);
72     state->bits_left -= num_bits;
73     return result;
74     }
75    
76     return a52_bitstream_get_bh_2 (state, num_bits);
77     }

  ViewVC Help
Powered by ViewVC 1.1.22