diff options
Diffstat (limited to 'apps/codecs/liba52/bitstream.h')
-rw-r--r-- | apps/codecs/liba52/bitstream.h | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/apps/codecs/liba52/bitstream.h b/apps/codecs/liba52/bitstream.h new file mode 100644 index 0000000000..f559fbf833 --- /dev/null +++ b/apps/codecs/liba52/bitstream.h | |||
@@ -0,0 +1,77 @@ | |||
1 | /* | ||
2 | * bitstream.h | ||
3 | * Copyright (C) 2000-2003 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 | } | ||