/[pcsx2_0.9.7]/trunk/3rdparty/liba52/bitstream.h
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Contents of /trunk/3rdparty/liba52/bitstream.h

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Revision 31 - (show annotations) (download)
Tue Sep 7 03:24:11 2010 UTC (9 years, 4 months ago) by william
File MIME type: text/plain
File size: 2283 byte(s)
committing r3113 initial commit again...
1 /*
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 }

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